Shadows: Added experimental texture-based shadows (stripped of dynamic tex config and back-end code)

(merged 10 commits, removing dynamic tex config, moved tex config to internal structs, removed back-end changes)
(squashed 2025-06-11, fixed conflict, doesn't build as-is)
Shadows: Added IMGUI_HAS_SHADOWS
Shadows: Demo code in Custom Rendering section. Added AddShadowRectFilled() variant. BeginMainMenuBar() disable shadows.
Shadows: Added initial version of convex shape shadow code.
(+stripped out of original polygon generation demo, moved to imgui_dev)
Shadows: Tweak demo to use AddShadowCircle() functions + fix warnings.
 (+ stripped old polygon generation code from commits)
Shadows: Convex shape shadow improvement/fixes
- Fixed pixel cracking on convex shadow edges
- Added convex shadow offset support
- Fixed some convex shadow fringing issues
- Added convex shadow demo code
Shadows: Added ImDrawShadowFlags, simplified API surface, reordered parameters
+ fix minor warnings
+ removed NGon variant for now.
Shadows: Re-added AddShadowNGon().
Shadows: Shallow styling tweaks and renaming for consistency.
Shadows: Fixes + two fixes for PVS Studio static analyzer.
Shadows: Fix for latest, reuse ImDrawList, remove ImDrawShadowFlags.
Shadows: Fix to support for colored-only font atlas. (4202)
Shadows: Fix broken shadows due to zero-clear added in 9417acc2.
Shadows: remove use of GetWindowContentRegionMax().
Shadows: WIP fixes for latest. (broken UV caching)
Shadows: WIP for latest (refreshing UV coordinates).
Demo: Add missing trailing null terminator to convex shape combo (9434)

.gitignore

@@ -1,5 +1,7 @@
-## OSX artifacts
+## Misc artifacts
 .DS_Store
+.claude
+.vscode
 
 ## Dear ImGui artifacts
 imgui.ini
@@ -55,9 +57,6 @@ examples/example_sdl3_wgpu/web/*
 .idea
 cmake-build-*
 
-## VS code artifacts
-.vscode
-
 ## Unix executables from our example Makefiles
 examples/example_apple_metal/example_apple_metal
 examples/example_apple_opengl2/example_apple_opengl2

backends/imgui_impl_allegro5.cpp

@@ -9,8 +9,8 @@
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
 // Missing features or Issues:
 //  [ ] Renderer: The renderer is suboptimal as we need to unindex our buffers and convert vertices manually.
+//  [ ] Renderer: Missing support for DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest callbacks: Allegro5 cannot enable/disable LINEAR bitmap flags after creation.
 //  [ ] Platform: Missing gamepad support.
-//  [ ] Renderer: Multi-viewport support (multiple windows).
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -22,6 +22,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState (others cannot be supported by Allegro5). (#9378)
 //  2025-09-18: Call platform_io.ClearRendererHandlers() and platform_io.ClearPlatformHandlers() on shutdown.
 //  2025-08-12: Inputs: fixed missing support for ImGuiKey_PrintScreen under Windows, as raw Allegro 5 does not receive it.
 //  2025-08-12: Added ImGui_ImplAllegro5_SetDisplay() function to change current ALLEGRO_DISPLAY, as Allegro applications often need to do that.
@@ -137,7 +138,10 @@ static void ImGui_ImplAllegro5_SetupRenderState(ImDrawData* draw_data)
     }
 }
 
-// Render function.
+// Draw callbacks
+static void ImGui_ImplAllegro5_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*) {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+
+// Render function
 void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
 {
     // Avoid rendering when minimized
@@ -153,6 +157,7 @@ void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
 
     // Backup Allegro state that will be modified
     ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     ALLEGRO_TRANSFORM last_transform = *al_get_current_transform();
     ALLEGRO_TRANSFORM last_projection_transform = *al_get_current_projection_transform();
     int last_clip_x, last_clip_y, last_clip_w, last_clip_h;
@@ -209,8 +214,7 @@ void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
             if (pcmd->UserCallback)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplAllegro5_DrawCallback_ResetRenderState)
                     ImGui_ImplAllegro5_SetupRenderState(draw_data);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -487,11 +491,12 @@ bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
 
     ImGui_ImplAllegro5_SetDisplay(display);
 
-#if ALLEGRO_HAS_CLIPBOARD
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+#if ALLEGRO_HAS_CLIPBOARD
     platform_io.Platform_SetClipboardTextFn = ImGui_ImplAllegro5_SetClipboardText;
     platform_io.Platform_GetClipboardTextFn = ImGui_ImplAllegro5_GetClipboardText;
 #endif
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplAllegro5_DrawCallback_ResetRenderState;
 
     return true;
 }

backends/imgui_impl_allegro5.h

@@ -9,8 +9,8 @@
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
 // Missing features or Issues:
 //  [ ] Renderer: The renderer is suboptimal as we need to unindex our buffers and convert vertices manually.
+//  [ ] Renderer: Missing support for DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest callbacks: Allegro5 cannot enable/disable LINEAR bitmap flags after creation.
 //  [ ] Platform: Missing gamepad support.
-//  [ ] Renderer: Multi-viewport support (multiple windows).
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_android.cpp

@@ -8,7 +8,6 @@
 //  [ ] Platform: Clipboard support.
 //  [ ] Platform: Gamepad support.
 //  [ ] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. FIXME: Check if this is even possible with Android.
-//  [ ] Platform: Multi-viewport support (multiple windows). Not meaningful on Android.
 // Important:
 //  - Consider using SDL or GLFW backend on Android, which will be more full-featured than this.
 //  - FIXME: On-screen keyboard currently needs to be enabled by the application (see examples/ and issue #3446)

backends/imgui_impl_android.h

@@ -8,7 +8,6 @@
 //  [ ] Platform: Clipboard support.
 //  [ ] Platform: Gamepad support.
 //  [ ] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. FIXME: Check if this is even possible with Android.
-//  [ ] Platform: Multi-viewport support (multiple windows). Not meaningful on Android.
 // Important:
 //  - Consider using SDL or GLFW backend on Android, which will be more full-featured than this.
 //  - FIXME: On-screen keyboard currently needs to be enabled by the application (see examples/ and issue #3446)

backends/imgui_impl_dx10.cpp

@@ -5,7 +5,6 @@
 //  [X] Renderer: User texture binding. Use 'ID3D10ShaderResourceView*' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -17,8 +16,8 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
-//  2026-01-19: DirectX11: Added 'SamplerNearest' in ImGui_ImplDX11_RenderState. Renamed 'SamplerDefault' to 'SamplerLinear'. 
+//  2026-04-23: DirectX10: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. Obsoleting samplers from ImGui_ImplDX10_RenderState. (#9378)
+//  2026-01-19: DirectX10: Added 'SamplerNearest' in ImGui_ImplDX10_RenderState. Renamed 'SamplerDefault' to 'SamplerLinear'. 
 //  2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
 //  2025-06-11: DirectX10: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas.
 //  2025-05-07: DirectX10: Honor draw_data->FramebufferScale to allow for custom backends and experiment using it (consistently with other renderer backends, even though in normal condition it is not set under Windows).
@@ -100,10 +99,6 @@ static ImGui_ImplDX10_Data* ImGui_ImplDX10_GetBackendData()
     return ImGui::GetCurrentContext() ? (ImGui_ImplDX10_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
-// Forward Declarations
-static void ImGui_ImplDX10_InitMultiViewportSupport();
-static void ImGui_ImplDX10_ShutdownMultiViewportSupport();
-
 // Functions
 static void ImGui_ImplDX10_SetupRenderState(ImDrawData* draw_data, ID3D10Device* device)
 {
@@ -159,6 +154,11 @@ static void ImGui_ImplDX10_SetupRenderState(ImDrawData* draw_data, ID3D10Device*
     device->RSSetState(bd->pRasterizerState);
 }
 
+// Draw callbacks
+static void ImGui_ImplDX10_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)       {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+static void ImGui_ImplDX10_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)       { ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData(); bd->pd3dDevice->PSSetSamplers(0, 1, &bd->pTexSamplerLinear); }
+static void ImGui_ImplDX10_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)      { ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData(); bd->pd3dDevice->PSSetSamplers(0, 1, &bd->pTexSamplerNearest); }
+
 // Render function
 void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
 {
@@ -183,7 +183,7 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
         bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
         D3D10_BUFFER_DESC desc = {};
         desc.Usage = D3D10_USAGE_DYNAMIC;
-        desc.ByteWidth = bd->VertexBufferSize * sizeof(ImDrawVert);
+        desc.ByteWidth = (UINT)bd->VertexBufferSize * sizeof(ImDrawVert);
         desc.BindFlags = D3D10_BIND_VERTEX_BUFFER;
         desc.CPUAccessFlags = D3D10_CPU_ACCESS_WRITE;
         desc.MiscFlags = 0;
@@ -197,7 +197,7 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
         bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
         D3D10_BUFFER_DESC desc = {};
         desc.Usage = D3D10_USAGE_DYNAMIC;
-        desc.ByteWidth = bd->IndexBufferSize * sizeof(ImDrawIdx);
+        desc.ByteWidth = (UINT)bd->IndexBufferSize * sizeof(ImDrawIdx);
         desc.BindFlags = D3D10_BIND_INDEX_BUFFER;
         desc.CPUAccessFlags = D3D10_CPU_ACCESS_WRITE;
         if (device->CreateBuffer(&desc, nullptr, &bd->pIB) < 0)
@@ -266,8 +266,6 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     ImGui_ImplDX10_RenderState render_state;
     render_state.Device = bd->pd3dDevice;
-    render_state.SamplerLinear = bd->pTexSamplerLinear;
-    render_state.SamplerNearest = bd->pTexSamplerNearest;
     render_state.VertexConstantBuffer = bd->pVertexConstantBuffer;
     platform_io.Renderer_RenderState = &render_state;
 
@@ -285,8 +283,7 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
             if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplDX10_DrawCallback_ResetRenderState)
                     ImGui_ImplDX10_SetupRenderState(draw_data, device);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -616,10 +613,12 @@ bool    ImGui_ImplDX10_Init(ID3D10Device* device)
     io.BackendRendererName = "imgui_impl_dx10";
     io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
     io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
 
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     platform_io.Renderer_TextureMaxWidth = platform_io.Renderer_TextureMaxHeight = D3D10_REQ_TEXTURE2D_U_OR_V_DIMENSION;
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplDX10_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplDX10_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplDX10_DrawCallback_SetSamplerNearest;
 
     // Get factory from device
     IDXGIDevice* pDXGIDevice = nullptr;
@@ -636,8 +635,6 @@ bool    ImGui_ImplDX10_Init(ID3D10Device* device)
     if (pDXGIAdapter) pDXGIAdapter->Release();
     bd->pd3dDevice->AddRef();
 
-    ImGui_ImplDX10_InitMultiViewportSupport();
-
     return true;
 }
 
@@ -648,14 +645,13 @@ void ImGui_ImplDX10_Shutdown()
     ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
-    ImGui_ImplDX10_ShutdownMultiViewportSupport();
     ImGui_ImplDX10_InvalidateDeviceObjects();
     if (bd->pFactory) { bd->pFactory->Release(); }
     if (bd->pd3dDevice) { bd->pd3dDevice->Release(); }
 
     io.BackendRendererName = nullptr;
     io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasViewports);
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
     platform_io.ClearRendererHandlers();
     IM_DELETE(bd);
 }
@@ -670,131 +666,6 @@ void ImGui_ImplDX10_NewFrame()
             IM_ASSERT(0 && "ImGui_ImplDX10_CreateDeviceObjects() failed!");
 }
 
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-// Helper structure we store in the void* RendererUserData field of each ImGuiViewport to easily retrieve our backend data.
-struct ImGui_ImplDX10_ViewportData
-{
-    IDXGISwapChain*         SwapChain;
-    ID3D10RenderTargetView* RTView;
-
-    ImGui_ImplDX10_ViewportData()   { SwapChain = nullptr; RTView = nullptr; }
-    ~ImGui_ImplDX10_ViewportData()  { IM_ASSERT(SwapChain == nullptr && RTView == nullptr); }
-};
-
-static void ImGui_ImplDX10_CreateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
-    ImGui_ImplDX10_ViewportData* vd = IM_NEW(ImGui_ImplDX10_ViewportData)();
-    viewport->RendererUserData = vd;
-
-    // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL's WindowID).
-    // Some backends will leave PlatformHandleRaw == 0, in which case we assume PlatformHandle will contain the HWND.
-    HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
-    IM_ASSERT(hwnd != 0);
-
-    // Create swap chain
-    DXGI_SWAP_CHAIN_DESC sd;
-    ZeroMemory(&sd, sizeof(sd));
-    sd.BufferDesc.Width = (UINT)viewport->Size.x;
-    sd.BufferDesc.Height = (UINT)viewport->Size.y;
-    sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
-    sd.SampleDesc.Count = 1;
-    sd.SampleDesc.Quality = 0;
-    sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
-    sd.BufferCount = 1;
-    sd.OutputWindow = hwnd;
-    sd.Windowed = TRUE;
-    sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
-    sd.Flags = 0;
-
-    IM_ASSERT(vd->SwapChain == nullptr && vd->RTView == nullptr);
-    bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain);
-    bd->pFactory->MakeWindowAssociation(hwnd, DXGI_MWA_NO_ALT_ENTER | DXGI_MWA_NO_WINDOW_CHANGES); // Disable e.g. Alt+Enter
-
-    // Create the render target
-    if (vd->SwapChain)
-    {
-        ID3D10Texture2D* pBackBuffer;
-        vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
-        pBackBuffer->Release();
-    }
-}
-
-static void ImGui_ImplDX10_DestroyWindow(ImGuiViewport* viewport)
-{
-    // The main viewport (owned by the application) will always have RendererUserData == 0 here since we didn't create the data for it.
-    if (ImGui_ImplDX10_ViewportData* vd = (ImGui_ImplDX10_ViewportData*)viewport->RendererUserData)
-    {
-        if (vd->SwapChain)
-            vd->SwapChain->Release();
-        vd->SwapChain = nullptr;
-        if (vd->RTView)
-            vd->RTView->Release();
-        vd->RTView = nullptr;
-        IM_DELETE(vd);
-    }
-    viewport->RendererUserData = nullptr;
-}
-
-static void ImGui_ImplDX10_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
-    ImGui_ImplDX10_ViewportData* vd = (ImGui_ImplDX10_ViewportData*)viewport->RendererUserData;
-    if (vd->RTView)
-    {
-        vd->RTView->Release();
-        vd->RTView = nullptr;
-    }
-    if (vd->SwapChain)
-    {
-        ID3D10Texture2D* pBackBuffer = nullptr;
-        vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0);
-        vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-        if (pBackBuffer == nullptr) { fprintf(stderr, "ImGui_ImplDX10_SetWindowSize() failed creating buffers.\n"); return; }
-        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
-        pBackBuffer->Release();
-    }
-}
-
-static void ImGui_ImplDX10_RenderViewport(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
-    ImGui_ImplDX10_ViewportData* vd = (ImGui_ImplDX10_ViewportData*)viewport->RendererUserData;
-    ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
-    bd->pd3dDevice->OMSetRenderTargets(1, &vd->RTView, nullptr);
-    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
-        bd->pd3dDevice->ClearRenderTargetView(vd->RTView, (float*)&clear_color);
-    ImGui_ImplDX10_RenderDrawData(viewport->DrawData);
-}
-
-static void ImGui_ImplDX10_SwapBuffers(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplDX10_ViewportData* vd = (ImGui_ImplDX10_ViewportData*)viewport->RendererUserData;
-    if (vd->SwapChain)
-        vd->SwapChain->Present(0, 0); // Present without vsync
-}
-
-void ImGui_ImplDX10_InitMultiViewportSupport()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_CreateWindow = ImGui_ImplDX10_CreateWindow;
-    platform_io.Renderer_DestroyWindow = ImGui_ImplDX10_DestroyWindow;
-    platform_io.Renderer_SetWindowSize = ImGui_ImplDX10_SetWindowSize;
-    platform_io.Renderer_RenderWindow = ImGui_ImplDX10_RenderViewport;
-    platform_io.Renderer_SwapBuffers = ImGui_ImplDX10_SwapBuffers;
-}
-
-void ImGui_ImplDX10_ShutdownMultiViewportSupport()
-{
-    ImGui::DestroyPlatformWindows();
-}
-
 //-----------------------------------------------------------------------------
 
 #endif // #ifndef IMGUI_DISABLE

backends/imgui_impl_dx10.h

@@ -5,7 +5,6 @@
 //  [X] Renderer: User texture binding. Use 'ID3D10ShaderResourceView*' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -42,9 +41,9 @@ IMGUI_IMPL_API void     ImGui_ImplDX10_UpdateTexture(ImTextureData* tex);
 struct ImGui_ImplDX10_RenderState
 {
     ID3D10Device*           Device;
-    ID3D10SamplerState*     SamplerLinear;
-    ID3D10SamplerState*     SamplerNearest;
     ID3D10Buffer*           VertexConstantBuffer;
+    //ID3D10SamplerState*   SamplerLinear;          // Use ImDrawList::AddCallback(ImGui::GetPlatform().DrawCallback_SetSamplerLinear)
+    //ID3D10SamplerState*   SamplerNearest;         // Use ImDrawList::AddCallback(ImGui::GetPlatform().DrawCallback_SetSamplerNearest)
 };
 
 #endif // #ifndef IMGUI_DISABLE

backends/imgui_impl_dx11.cpp

@@ -6,7 +6,6 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -18,12 +17,11 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2026-04-23: DirectX11: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. Obsoleting samplers from ImGui_ImplDX11_RenderState. (#9378)
 //  2026-01-19: DirectX11: Added 'SamplerNearest' in ImGui_ImplDX11_RenderState. Renamed 'SamplerDefault' to 'SamplerLinear'.
 //  2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
 //  2025-06-11: DirectX11: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas.
 //  2025-05-07: DirectX11: Honor draw_data->FramebufferScale to allow for custom backends and experiment using it (consistently with other renderer backends, even though in normal condition it is not set under Windows).
-//  2025-02-24: [Docking] Added undocumented ImGui_ImplDX11_SetSwapChainDescs() to configure swap chain creation for secondary viewports.
 //  2025-01-06: DirectX11: Expose VertexConstantBuffer in ImGui_ImplDX11_RenderState. Reset projection matrix in ImDrawCallback_ResetRenderState handler.
 //  2024-10-07: DirectX11: Changed default texture sampler to Clamp instead of Repeat/Wrap.
 //  2024-10-07: DirectX11: Expose selected render state in ImGui_ImplDX11_RenderState, which you can access in 'void* platform_io.Renderer_RenderState' during draw callbacks.
@@ -88,7 +86,7 @@ struct ImGui_ImplDX11_Data
     ID3D11DepthStencilState*    pDepthStencilState;
     int                         VertexBufferSize;
     int                         IndexBufferSize;
-    ImVector<DXGI_SWAP_CHAIN_DESC> SwapChainDescsForViewports;
+    ImGui_ImplDX11_RenderState* RenderState;            // == (ImGui_ImplDX11_RenderState*)ImGui::GetPlatformIO().Renderer_RenderState during rendering.
 
     ImGui_ImplDX11_Data()       { memset((void*)this, 0, sizeof(*this)); VertexBufferSize = 5000; IndexBufferSize = 10000; }
 };
@@ -105,10 +103,6 @@ static ImGui_ImplDX11_Data* ImGui_ImplDX11_GetBackendData()
     return ImGui::GetCurrentContext() ? (ImGui_ImplDX11_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
-// Forward Declarations
-static void ImGui_ImplDX11_InitMultiViewportSupport();
-static void ImGui_ImplDX11_ShutdownMultiViewportSupport();
-
 // Functions
 static void ImGui_ImplDX11_SetupRenderState(const ImDrawData* draw_data, ID3D11DeviceContext* device_ctx)
 {
@@ -167,6 +161,11 @@ static void ImGui_ImplDX11_SetupRenderState(const ImDrawData* draw_data, ID3D11D
     device_ctx->RSSetState(bd->pRasterizerState);
 }
 
+// Draw callbacks
+static void ImGui_ImplDX11_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)       {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+static void ImGui_ImplDX11_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)       { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); bd->RenderState->DeviceContext->PSSetSamplers(0, 1, &bd->pTexSamplerLinear); }
+static void ImGui_ImplDX11_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)      { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); bd->RenderState->DeviceContext->PSSetSamplers(0, 1, &bd->pTexSamplerNearest); }
+
 // Render function
 void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
 {
@@ -191,7 +190,7 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
         bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
         D3D11_BUFFER_DESC desc = {};
         desc.Usage = D3D11_USAGE_DYNAMIC;
-        desc.ByteWidth = bd->VertexBufferSize * sizeof(ImDrawVert);
+        desc.ByteWidth = (UINT)bd->VertexBufferSize * sizeof(ImDrawVert);
         desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
         desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
         desc.MiscFlags = 0;
@@ -204,7 +203,7 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
         bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
         D3D11_BUFFER_DESC desc = {};
         desc.Usage = D3D11_USAGE_DYNAMIC;
-        desc.ByteWidth = bd->IndexBufferSize * sizeof(ImDrawIdx);
+        desc.ByteWidth = (UINT)bd->IndexBufferSize * sizeof(ImDrawIdx);
         desc.BindFlags = D3D11_BIND_INDEX_BUFFER;
         desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
         if (bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pIB) < 0)
@@ -282,10 +281,8 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
     ImGui_ImplDX11_RenderState render_state;
     render_state.Device = bd->pd3dDevice;
     render_state.DeviceContext = bd->pd3dDeviceContext;
-    render_state.SamplerLinear = bd->pTexSamplerLinear;
-    render_state.SamplerNearest = bd->pTexSamplerNearest;
     render_state.VertexConstantBuffer = bd->pVertexConstantBuffer;
-    platform_io.Renderer_RenderState = &render_state;
+    platform_io.Renderer_RenderState = bd->RenderState = &render_state;
 
     // Render command lists
     // (Because we merged all buffers into a single one, we maintain our own offset into them)
@@ -301,8 +298,7 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
             if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplDX11_DrawCallback_ResetRenderState)
                     ImGui_ImplDX11_SetupRenderState(draw_data, device);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -328,7 +324,7 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
         global_idx_offset += draw_list->IdxBuffer.Size;
         global_vtx_offset += draw_list->VtxBuffer.Size;
     }
-    platform_io.Renderer_RenderState = nullptr;
+    platform_io.Renderer_RenderState = bd->RenderState = nullptr;
 
     // Restore modified DX state
     device->RSSetScissorRects(old.ScissorRectsCount, old.ScissorRects);
@@ -634,10 +630,12 @@ bool    ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_co
     io.BackendRendererName = "imgui_impl_dx11";
     io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
     io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
 
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     platform_io.Renderer_TextureMaxWidth = platform_io.Renderer_TextureMaxHeight = D3D11_REQ_TEXTURE2D_U_OR_V_DIMENSION;
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplDX11_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplDX11_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplDX11_DrawCallback_SetSamplerNearest;
 
     // Get factory from device
     IDXGIDevice* pDXGIDevice = nullptr;
@@ -657,8 +655,6 @@ bool    ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_co
     bd->pd3dDevice->AddRef();
     bd->pd3dDeviceContext->AddRef();
 
-    ImGui_ImplDX11_InitMultiViewportSupport();
-
     return true;
 }
 
@@ -669,7 +665,6 @@ void ImGui_ImplDX11_Shutdown()
     ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
-    ImGui_ImplDX11_ShutdownMultiViewportSupport();
     ImGui_ImplDX11_InvalidateDeviceObjects();
     if (bd->pFactory)             { bd->pFactory->Release(); }
     if (bd->pd3dDevice)           { bd->pd3dDevice->Release(); }
@@ -677,7 +672,7 @@ void ImGui_ImplDX11_Shutdown()
 
     io.BackendRendererName = nullptr;
     io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasViewports);
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
     platform_io.ClearRendererHandlers();
     IM_DELETE(bd);
 }
@@ -692,152 +687,6 @@ void ImGui_ImplDX11_NewFrame()
             IM_ASSERT(0 && "ImGui_ImplDX11_CreateDeviceObjects() failed!");
 }
 
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-// Helper structure we store in the void* RendererUserData field of each ImGuiViewport to easily retrieve our backend data.
-struct ImGui_ImplDX11_ViewportData
-{
-    IDXGISwapChain*                 SwapChain;
-    ID3D11RenderTargetView*         RTView;
-
-    ImGui_ImplDX11_ViewportData()   { SwapChain = nullptr; RTView = nullptr; }
-    ~ImGui_ImplDX11_ViewportData()  { IM_ASSERT(SwapChain == nullptr && RTView == nullptr); }
-};
-
-// Multi-Viewports: configure templates used when creating swapchains for secondary viewports. Will try them in order.
-// This is intentionally not declared in the .h file yet, so you will need to copy this declaration:
-void ImGui_ImplDX11_SetSwapChainDescs(const DXGI_SWAP_CHAIN_DESC* desc_templates, int desc_templates_count);
-void ImGui_ImplDX11_SetSwapChainDescs(const DXGI_SWAP_CHAIN_DESC* desc_templates, int desc_templates_count)
-{
-    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
-    bd->SwapChainDescsForViewports.resize(desc_templates_count);
-    memcpy(bd->SwapChainDescsForViewports.Data, desc_templates, sizeof(DXGI_SWAP_CHAIN_DESC));
-}
-
-static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
-    ImGui_ImplDX11_ViewportData* vd = IM_NEW(ImGui_ImplDX11_ViewportData)();
-    viewport->RendererUserData = vd;
-
-    // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL's WindowID).
-    // Some backends will leave PlatformHandleRaw == 0, in which case we assume PlatformHandle will contain the HWND.
-    HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
-    IM_ASSERT(hwnd != 0);
-    IM_ASSERT(vd->SwapChain == nullptr && vd->RTView == nullptr);
-
-    // Create swap chain
-    HRESULT hr = DXGI_ERROR_UNSUPPORTED;
-    for (const DXGI_SWAP_CHAIN_DESC& sd_template : bd->SwapChainDescsForViewports)
-    {
-        IM_ASSERT(sd_template.BufferDesc.Width == 0 && sd_template.BufferDesc.Height == 0 && sd_template.OutputWindow == nullptr);
-        DXGI_SWAP_CHAIN_DESC sd = sd_template;
-        sd.BufferDesc.Width = (UINT)viewport->Size.x;
-        sd.BufferDesc.Height = (UINT)viewport->Size.y;
-        sd.OutputWindow = hwnd;
-        hr = bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain);
-        if (SUCCEEDED(hr))
-            break;
-    }
-    IM_ASSERT(SUCCEEDED(hr));
-    bd->pFactory->MakeWindowAssociation(hwnd, DXGI_MWA_NO_ALT_ENTER | DXGI_MWA_NO_WINDOW_CHANGES); // Disable e.g. Alt+Enter
-
-    // Create the render target
-    if (vd->SwapChain != nullptr)
-    {
-        ID3D11Texture2D* pBackBuffer;
-        vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
-        pBackBuffer->Release();
-    }
-}
-
-static void ImGui_ImplDX11_DestroyWindow(ImGuiViewport* viewport)
-{
-    // The main viewport (owned by the application) will always have RendererUserData == nullptr since we didn't create the data for it.
-    if (ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData)
-    {
-        if (vd->SwapChain)
-            vd->SwapChain->Release();
-        vd->SwapChain = nullptr;
-        if (vd->RTView)
-            vd->RTView->Release();
-        vd->RTView = nullptr;
-        IM_DELETE(vd);
-    }
-    viewport->RendererUserData = nullptr;
-}
-
-static void ImGui_ImplDX11_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
-    ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
-    if (vd->RTView)
-    {
-        vd->RTView->Release();
-        vd->RTView = nullptr;
-    }
-    if (vd->SwapChain)
-    {
-        ID3D11Texture2D* pBackBuffer = nullptr;
-        vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0);
-        vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-        if (pBackBuffer == nullptr) { fprintf(stderr, "ImGui_ImplDX11_SetWindowSize() failed creating buffers.\n"); return; }
-        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
-        pBackBuffer->Release();
-    }
-}
-
-static void ImGui_ImplDX11_RenderWindow(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
-    ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
-    ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
-    bd->pd3dDeviceContext->OMSetRenderTargets(1, &vd->RTView, nullptr);
-    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
-        bd->pd3dDeviceContext->ClearRenderTargetView(vd->RTView, (float*)&clear_color);
-    ImGui_ImplDX11_RenderDrawData(viewport->DrawData);
-}
-
-static void ImGui_ImplDX11_SwapBuffers(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
-    if (vd->SwapChain)
-        vd->SwapChain->Present(0, 0); // Present without vsync
-}
-
-static void ImGui_ImplDX11_InitMultiViewportSupport()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_CreateWindow = ImGui_ImplDX11_CreateWindow;
-    platform_io.Renderer_DestroyWindow = ImGui_ImplDX11_DestroyWindow;
-    platform_io.Renderer_SetWindowSize = ImGui_ImplDX11_SetWindowSize;
-    platform_io.Renderer_RenderWindow = ImGui_ImplDX11_RenderWindow;
-    platform_io.Renderer_SwapBuffers = ImGui_ImplDX11_SwapBuffers;
-
-    // Default swapchain format
-    DXGI_SWAP_CHAIN_DESC sd;
-    ZeroMemory(&sd, sizeof(sd));
-    sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
-    sd.SampleDesc.Count = 1;
-    sd.SampleDesc.Quality = 0;
-    sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
-    sd.BufferCount = 1;
-    sd.Windowed = TRUE;
-    sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
-    sd.Flags = 0;
-    ImGui_ImplDX11_SetSwapChainDescs(&sd, 1);
-}
-
-static void ImGui_ImplDX11_ShutdownMultiViewportSupport()
-{
-    ImGui::DestroyPlatformWindows();
-}
-
 //-----------------------------------------------------------------------------
 
 #endif // #ifndef IMGUI_DISABLE

backends/imgui_impl_dx11.h

@@ -6,7 +6,6 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -45,9 +44,9 @@ struct ImGui_ImplDX11_RenderState
 {
     ID3D11Device*           Device;
     ID3D11DeviceContext*    DeviceContext;
-    ID3D11SamplerState*     SamplerLinear;
-    ID3D11SamplerState*     SamplerNearest;
     ID3D11Buffer*           VertexConstantBuffer;
+    //ID3D11SamplerState*   SamplerLinear;          // Use ImDrawList::AddCallback(ImGui::GetPlatform().DrawCallback_SetSamplerLinear)
+    //ID3D11SamplerState*   SamplerNearest;         // Use ImDrawList::AddCallback(ImGui::GetPlatform().DrawCallback_SetSamplerNearest)
 };
 
 #endif // #ifndef IMGUI_DISABLE

backends/imgui_impl_dx12.cpp

@@ -6,8 +6,6 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
-//      FIXME: The transition from removing a viewport and moving the window in an existing hosted viewport tends to flicker.
 
 // The aim of imgui_impl_dx12.h/.cpp is to be usable in your engine without any modification.
 // IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/
@@ -22,8 +20,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
-//  2025-10-23: [Docking] DirectX12: Fixed an issue in synchronization logic improving rendering throughput for secondary viewports. (#8961, #9025)
+//  2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. (#9378)
 //  2025-10-11: DirectX12: Reuse texture upload buffer and grow it only when necessary. (#9002)
 //  2025-09-29: DirectX12: Rework synchronization logic. (#8961)
 //  2025-09-29: DirectX12: Enable swapchain tearing to eliminate viewports framerate throttling. (#8965)
@@ -95,6 +92,8 @@ struct ImGui_ImplDX12_Texture
 struct ImGui_ImplDX12_Data
 {
     ImGui_ImplDX12_InitInfo     InitInfo;
+    ImGui_ImplDX12_RenderState* RenderState;
+        
     IDXGIFactory5*              pdxgiFactory;
     ID3D12Device*               pd3dDevice;
     ID3D12RootSignature*        pRootSignatureLinear;
@@ -119,6 +118,9 @@ struct ImGui_ImplDX12_Data
     UINT                        pTexUploadBufferSize;
     void*                       pTexUploadBufferMapped;
 
+    ImGui_ImplDX12_RenderBuffers* pFrameResources;
+    UINT                        frameIndex;
+
     ImGui_ImplDX12_Data()       { memset((void*)this, 0, sizeof(*this)); }
 };
 
@@ -138,98 +140,20 @@ struct ImGui_ImplDX12_RenderBuffers
     int                 VertexBufferSize;
 };
 
-// Buffers used for secondary viewports created by the multi-viewports systems
-struct ImGui_ImplDX12_FrameContext
-{
-    UINT64                          FenceValue;
-    ID3D12CommandAllocator*         CommandAllocator;
-    ID3D12Resource*                 RenderTarget;
-    D3D12_CPU_DESCRIPTOR_HANDLE     RenderTargetCpuDescriptors;
-};
-
-// Helper structure we store in the void* RendererUserData field of each ImGuiViewport to easily retrieve our backend data.
-// Main viewport created by application will only use the Resources field.
-// Secondary viewports created by this backend will use all the fields (including Window fields),
-struct ImGui_ImplDX12_ViewportData
-{
-    // Window
-    ID3D12CommandQueue*             CommandQueue;
-    ID3D12GraphicsCommandList*      CommandList;
-    ID3D12DescriptorHeap*           RtvDescHeap;
-    IDXGISwapChain3*                SwapChain;
-    HANDLE                          SwapChainWaitableObject;
-    UINT                            NumFramesInFlight;
-    ImGui_ImplDX12_FrameContext*    FrameCtx;
-
-    // Render buffers
-    UINT                            FrameIndex;
-    ImGui_ImplDX12_RenderBuffers*   FrameRenderBuffers;
-
-    ImGui_ImplDX12_ViewportData(UINT num_frames_in_flight)
-    {
-        CommandQueue = nullptr;
-        CommandList = nullptr;
-        RtvDescHeap = nullptr;
-        SwapChain = nullptr;
-        SwapChainWaitableObject = nullptr;
-        NumFramesInFlight = num_frames_in_flight;
-        FrameCtx = new ImGui_ImplDX12_FrameContext[NumFramesInFlight];
-        FrameIndex = 0;
-        FrameRenderBuffers = new ImGui_ImplDX12_RenderBuffers[NumFramesInFlight];
-
-        for (UINT i = 0; i < NumFramesInFlight; ++i)
-        {
-            FrameCtx[i].FenceValue = 0;
-            FrameCtx[i].CommandAllocator = nullptr;
-            FrameCtx[i].RenderTarget = nullptr;
-
-            // Create buffers with a default size (they will later be grown as needed)
-            FrameRenderBuffers[i].IndexBuffer = nullptr;
-            FrameRenderBuffers[i].VertexBuffer = nullptr;
-            FrameRenderBuffers[i].VertexBufferSize = 5000;
-            FrameRenderBuffers[i].IndexBufferSize = 10000;
-        }
-    }
-    ~ImGui_ImplDX12_ViewportData()
-    {
-        IM_ASSERT(CommandQueue == nullptr && CommandList == nullptr);
-        IM_ASSERT(RtvDescHeap == nullptr);
-        IM_ASSERT(SwapChain == nullptr);
-        IM_ASSERT(SwapChainWaitableObject == nullptr);
-
-        for (UINT i = 0; i < NumFramesInFlight; ++i)
-        {
-            IM_ASSERT(FrameCtx[i].CommandAllocator == nullptr && FrameCtx[i].RenderTarget == nullptr);
-            IM_ASSERT(FrameRenderBuffers[i].IndexBuffer == nullptr && FrameRenderBuffers[i].VertexBuffer == nullptr);
-        }
-
-        delete[] FrameCtx; FrameCtx = nullptr;
-        delete[] FrameRenderBuffers; FrameRenderBuffers = nullptr;
-    }
-};
-
 struct VERTEX_CONSTANT_BUFFER_DX12
 {
     float   mvp[4][4];
 };
 
-// Forward Declarations
-static void ImGui_ImplDX12_InitMultiViewportSupport();
-static void ImGui_ImplDX12_ShutdownMultiViewportSupport();
-
-// FIXME-WIP: Allow user to forward declare those two, for until we come up with a backend agnostic API to do this. (#9173)
-void ImGui_ImplDX12_SetupSamplerLinear(ID3D12GraphicsCommandList* command_list);
-void ImGui_ImplDX12_SetupSamplerNearest(ID3D12GraphicsCommandList* command_list);
-
 // Functions
-void ImGui_ImplDX12_SetupSamplerLinear(ID3D12GraphicsCommandList* command_list)
+static void ImGui_ImplDX12_SetupSamplerLinear(ID3D12GraphicsCommandList* command_list)
 {
     ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
     command_list->SetPipelineState(bd->pPipelineStateLinear);
     command_list->SetGraphicsRootSignature(bd->pRootSignatureLinear);
 }
 
-void ImGui_ImplDX12_SetupSamplerNearest(ID3D12GraphicsCommandList* command_list)
+static void ImGui_ImplDX12_SetupSamplerNearest(ID3D12GraphicsCommandList* command_list)
 {
     ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
     command_list->SetPipelineState(bd->pPipelineStateNearest);
@@ -275,7 +199,7 @@ static void ImGui_ImplDX12_SetupRenderState(ImDrawData* draw_data, ID3D12Graphic
     command_list->IASetVertexBuffers(0, 1, &vbv);
     D3D12_INDEX_BUFFER_VIEW ibv = {};
     ibv.BufferLocation = fr->IndexBuffer->GetGPUVirtualAddress();
-    ibv.SizeInBytes = fr->IndexBufferSize * sizeof(ImDrawIdx);
+    ibv.SizeInBytes = (UINT)fr->IndexBufferSize * sizeof(ImDrawIdx);
     ibv.Format = sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT;
     command_list->IASetIndexBuffer(&ibv);
     command_list->IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
@@ -295,6 +219,11 @@ static inline void SafeRelease(T*& res)
     res = nullptr;
 }
 
+// Draw callbacks
+static void ImGui_ImplDX12_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)   {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+static void ImGui_ImplDX12_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)   { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); ImGui_ImplDX12_SetupSamplerLinear(bd->RenderState->CommandList); }
+static void ImGui_ImplDX12_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)  { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); ImGui_ImplDX12_SetupSamplerNearest(bd->RenderState->CommandList); }
+
 // Render function
 void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandList* command_list)
 {
@@ -311,9 +240,8 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
 
     // FIXME: We are assuming that this only gets called once per frame!
     ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)draw_data->OwnerViewport->RendererUserData;
-    ImGui_ImplDX12_RenderBuffers* fr = &vd->FrameRenderBuffers[vd->FrameIndex % bd->numFramesInFlight];
-    vd->FrameIndex++;
+    bd->frameIndex = bd->frameIndex + 1;
+    ImGui_ImplDX12_RenderBuffers* fr = &bd->pFrameResources[bd->frameIndex % bd->numFramesInFlight];
 
     // Create and grow vertex/index buffers if needed
     if (fr->VertexBuffer == nullptr || fr->VertexBufferSize < draw_data->TotalVtxCount)
@@ -393,7 +321,7 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
     ImGui_ImplDX12_RenderState render_state;
     render_state.Device = bd->pd3dDevice;
     render_state.CommandList = command_list;
-    platform_io.Renderer_RenderState = &render_state;
+    platform_io.Renderer_RenderState = bd->RenderState = &render_state;
 
     // Render command lists
     // (Because we merged all buffers into a single one, we maintain our own offset into them)
@@ -410,7 +338,7 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
             {
                 // User callback, registered via ImDrawList::AddCallback()
                 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplDX12_DrawCallback_ResetRenderState)
                     ImGui_ImplDX12_SetupRenderState(draw_data, command_list, fr);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -437,7 +365,7 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
         global_idx_offset += draw_list->IdxBuffer.Size;
         global_vtx_offset += draw_list->VtxBuffer.Size;
     }
-    platform_io.Renderer_RenderState = nullptr;
+    platform_io.Renderer_RenderState = bd->RenderState = nullptr;
 }
 
 static void ImGui_ImplDX12_DestroyTexture(ImTextureData* tex)
@@ -740,7 +668,7 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
         bd->pd3dDevice->CreateRootSignature(0, blob->GetBufferPointer(), blob->GetBufferSize(), IID_PPV_ARGS(&bd->pRootSignatureLinear));
         blob->Release();
 
-        // Root Signature for ImDrawCallback_SetSamplerNearest
+        // Nearest sampler
         staticSampler[0].Filter = D3D12_FILTER_MIN_MAG_MIP_POINT;
         if (D3D12SerializeRootSignatureFn(&desc, D3D_ROOT_SIGNATURE_VERSION_1, &blob, nullptr) != S_OK)
             return false;
@@ -889,7 +817,6 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
         return false;
     }
 
-    // Pipeline State for ImDrawCallback_SetSamplerNearest
     psoDesc.pRootSignature = bd->pRootSignatureNearest;
 
     result_pipeline_state = bd->pd3dDevice->CreateGraphicsPipelineState(&psoDesc, IID_PPV_ARGS(&bd->pPipelineStateNearest));
@@ -915,13 +842,6 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
     return true;
 }
 
-static void ImGui_ImplDX12_DestroyRenderBuffers(ImGui_ImplDX12_RenderBuffers* render_buffers)
-{
-    SafeRelease(render_buffers->IndexBuffer);
-    SafeRelease(render_buffers->VertexBuffer);
-    render_buffers->IndexBufferSize = render_buffers->VertexBufferSize = 0;
-}
-
 void    ImGui_ImplDX12_InvalidateDeviceObjects()
 {
     ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
@@ -954,6 +874,13 @@ void    ImGui_ImplDX12_InvalidateDeviceObjects()
     for (ImTextureData* tex : ImGui::GetPlatformIO().Textures)
         if (tex->RefCount == 1)
             ImGui_ImplDX12_DestroyTexture(tex);
+
+    for (UINT i = 0; i < bd->numFramesInFlight; i++)
+    {
+        ImGui_ImplDX12_RenderBuffers* fr = &bd->pFrameResources[i];
+        SafeRelease(fr->IndexBuffer);
+        SafeRelease(fr->VertexBuffer);
+    }
 }
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
@@ -1002,15 +929,11 @@ bool ImGui_ImplDX12_Init(ImGui_ImplDX12_InitInfo* init_info)
     io.BackendRendererName = "imgui_impl_dx12";
     io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
     io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
 
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        ImGui_ImplDX12_InitMultiViewportSupport();
-
-    // Create a dummy ImGui_ImplDX12_ViewportData holder for the main viewport,
-    // Since this is created and managed by the application, we will only use the ->Resources[] fields.
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    main_viewport->RendererUserData = IM_NEW(ImGui_ImplDX12_ViewportData)(bd->numFramesInFlight);
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplDX12_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplDX12_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplDX12_DrawCallback_SetSamplerNearest;
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     if (init_info->SrvDescriptorAllocFn == nullptr)
@@ -1018,6 +941,18 @@ bool ImGui_ImplDX12_Init(ImGui_ImplDX12_InitInfo* init_info)
 #endif
     IM_ASSERT(init_info->SrvDescriptorAllocFn != nullptr && init_info->SrvDescriptorFreeFn != nullptr);
 
+    // Create buffers with a default size (they will later be grown as needed)
+    bd->frameIndex = UINT_MAX;
+    bd->pFrameResources = new ImGui_ImplDX12_RenderBuffers[bd->numFramesInFlight];
+    for (int i = 0; i < (int)bd->numFramesInFlight; i++)
+    {
+        ImGui_ImplDX12_RenderBuffers* fr = &bd->pFrameResources[i];
+        fr->IndexBuffer = nullptr;
+        fr->VertexBuffer = nullptr;
+        fr->IndexBufferSize = 10000;
+        fr->VertexBufferSize = 5000;
+    }
+
     return true;
 }
 
@@ -1044,6 +979,7 @@ bool ImGui_ImplDX12_Init(ID3D12Device* device, int num_frames_in_flight, DXGI_FO
     bool ret = ImGui_ImplDX12_Init(&init_info);
     ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
     bd->commandQueueOwned = true;
+
     ImGuiIO& io = ImGui::GetIO();
     io.BackendFlags &= ~ImGuiBackendFlags_RendererHasTextures; // Using legacy ImGui_ImplDX12_Init() call with 1 SRV descriptor we cannot support multiple textures.
 
@@ -1058,23 +994,12 @@ void ImGui_ImplDX12_Shutdown()
     ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
-    // Manually delete main viewport render resources in-case we haven't initialized for viewports
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    if (ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)main_viewport->RendererUserData)
-    {
-        // We could just call ImGui_ImplDX12_DestroyWindow(main_viewport) as a convenience but that would be misleading since we only use data->Resources[]
-        for (UINT i = 0; i < bd->numFramesInFlight; i++)
-            ImGui_ImplDX12_DestroyRenderBuffers(&vd->FrameRenderBuffers[i]);
-        IM_DELETE(vd);
-        main_viewport->RendererUserData = nullptr;
-    }
-
-    ImGui_ImplDX12_ShutdownMultiViewportSupport();
     ImGui_ImplDX12_InvalidateDeviceObjects();
+    delete[] bd->pFrameResources;
 
     io.BackendRendererName = nullptr;
     io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasViewports);
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
     platform_io.ClearRendererHandlers();
     IM_DELETE(bd);
 }
@@ -1089,254 +1014,6 @@ void ImGui_ImplDX12_NewFrame()
             IM_ASSERT(0 && "ImGui_ImplDX12_CreateDeviceObjects() failed!");
 }
 
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-static void ImGui_ImplDX12_CreateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    ImGui_ImplDX12_ViewportData* vd = IM_NEW(ImGui_ImplDX12_ViewportData)(bd->numFramesInFlight);
-    viewport->RendererUserData = vd;
-
-    // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL's WindowID).
-    // Some backends will leave PlatformHandleRaw == 0, in which case we assume PlatformHandle will contain the HWND.
-    HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
-    IM_ASSERT(hwnd != 0);
-
-    // Use shared command queue from init info
-    vd->FrameIndex = 0;
-    vd->CommandQueue = bd->pCommandQueue;
-
-    // Create command allocator.
-    HRESULT res = S_OK;
-    for (UINT i = 0; i < bd->numFramesInFlight; ++i)
-    {
-        res = bd->pd3dDevice->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, IID_PPV_ARGS(&vd->FrameCtx[i].CommandAllocator));
-        IM_ASSERT(res == S_OK);
-    }
-
-    // Create command list.
-    res = bd->pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, vd->FrameCtx[0].CommandAllocator, nullptr, IID_PPV_ARGS(&vd->CommandList));
-    IM_ASSERT(res == S_OK);
-    vd->CommandList->Close();
-
-    // Create swap chain
-    // FIXME-VIEWPORT: May want to copy/inherit swap chain settings from the user/application.
-    DXGI_SWAP_CHAIN_DESC1 sd1;
-    ZeroMemory(&sd1, sizeof(sd1));
-    sd1.BufferCount = bd->numFramesInFlight;
-    sd1.Width = (UINT)viewport->Size.x;
-    sd1.Height = (UINT)viewport->Size.y;
-    sd1.Format = bd->RTVFormat;
-    sd1.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
-    sd1.SampleDesc.Count = 1;
-    sd1.SampleDesc.Quality = 0;
-    sd1.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
-    sd1.AlphaMode = DXGI_ALPHA_MODE_UNSPECIFIED;
-    sd1.Scaling = DXGI_SCALING_NONE;
-    sd1.Stereo = FALSE;
-    sd1.Flags = DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT;
-
-    if (bd->tearingSupport)
-        sd1.Flags |= DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING;
-
-    IDXGISwapChain1* swap_chain = nullptr;
-    res = bd->pdxgiFactory->CreateSwapChainForHwnd(vd->CommandQueue, hwnd, &sd1, nullptr, nullptr, &swap_chain);
-    IM_ASSERT(res == S_OK);
-    res = bd->pdxgiFactory->MakeWindowAssociation(hwnd, DXGI_MWA_NO_ALT_ENTER | DXGI_MWA_NO_WINDOW_CHANGES); // Disable e.g. Alt+Enter
-    IM_ASSERT(res == S_OK);
-
-    // Or swapChain.As(&mSwapChain)
-    IM_ASSERT(vd->SwapChain == nullptr);
-    swap_chain->QueryInterface(IID_PPV_ARGS(&vd->SwapChain));
-    swap_chain->Release();
-
-    // Create the render targets and waitable object
-    if (vd->SwapChain)
-    {
-        D3D12_DESCRIPTOR_HEAP_DESC desc = {};
-        desc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_RTV;
-        desc.NumDescriptors = bd->numFramesInFlight;
-        desc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;
-        desc.NodeMask = 1;
-
-        HRESULT hr = bd->pd3dDevice->CreateDescriptorHeap(&desc, IID_PPV_ARGS(&vd->RtvDescHeap));
-        IM_ASSERT(hr == S_OK);
-
-        SIZE_T rtv_descriptor_size = bd->pd3dDevice->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_RTV);
-        D3D12_CPU_DESCRIPTOR_HANDLE rtv_handle = vd->RtvDescHeap->GetCPUDescriptorHandleForHeapStart();
-        for (UINT i = 0; i < bd->numFramesInFlight; i++)
-        {
-            vd->FrameCtx[i].RenderTargetCpuDescriptors = rtv_handle;
-            rtv_handle.ptr += rtv_descriptor_size;
-        }
-
-        ID3D12Resource* back_buffer;
-        for (UINT i = 0; i < bd->numFramesInFlight; i++)
-        {
-            IM_ASSERT(vd->FrameCtx[i].RenderTarget == nullptr);
-            vd->SwapChain->GetBuffer(i, IID_PPV_ARGS(&back_buffer));
-            bd->pd3dDevice->CreateRenderTargetView(back_buffer, nullptr, vd->FrameCtx[i].RenderTargetCpuDescriptors);
-            vd->FrameCtx[i].RenderTarget = back_buffer;
-        }
-
-        hr = vd->SwapChain->SetMaximumFrameLatency(bd->numFramesInFlight);
-        IM_ASSERT(hr == S_OK);
-        vd->SwapChainWaitableObject = vd->SwapChain->GetFrameLatencyWaitableObject();
-    }
-
-    for (UINT i = 0; i < bd->numFramesInFlight; i++)
-        ImGui_ImplDX12_DestroyRenderBuffers(&vd->FrameRenderBuffers[i]);
-}
-
-static void ImGui_WaitForPendingOperations(ImGui_ImplDX12_ViewportData* vd)
-{
-    ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    HRESULT hr = vd->CommandQueue->Signal(bd->Fence, ++bd->FenceLastSignaledValue);
-    IM_ASSERT(hr == S_OK);
-
-    hr = bd->Fence->SetEventOnCompletion(bd->FenceLastSignaledValue, bd->FenceEvent);
-    IM_ASSERT(hr == S_OK);
-    ::WaitForSingleObject(bd->FenceEvent, INFINITE);
-}
-
-static ImGui_ImplDX12_FrameContext* ImGui_WaitForNextFrameContext(ImGui_ImplDX12_ViewportData* vd)
-{
-    ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    ImGui_ImplDX12_FrameContext* frame_context = &vd->FrameCtx[vd->FrameIndex % vd->NumFramesInFlight];
-    if (bd->Fence->GetCompletedValue() < frame_context->FenceValue)
-    {
-        HRESULT hr = bd->Fence->SetEventOnCompletion(frame_context->FenceValue, bd->FenceEvent);
-        IM_ASSERT(hr == S_OK);
-        HANDLE waitableObjects[] = { vd->SwapChainWaitableObject, bd->FenceEvent };
-        ::WaitForMultipleObjects(2, waitableObjects, TRUE, INFINITE);
-    }
-    else
-    {
-        ::WaitForSingleObject(vd->SwapChainWaitableObject, INFINITE);
-    }
-    return frame_context;
-}
-
-static void ImGui_ImplDX12_DestroyWindow(ImGuiViewport* viewport)
-{
-    // The main viewport (owned by the application) will always have RendererUserData == 0 since we didn't create the data for it.
-    ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    if (ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)viewport->RendererUserData)
-    {
-        ImGui_WaitForPendingOperations(vd);
-
-        vd->CommandQueue = nullptr;
-        ::CloseHandle(vd->SwapChainWaitableObject);
-        vd->SwapChainWaitableObject = nullptr;
-        SafeRelease(vd->CommandList);
-        SafeRelease(vd->SwapChain);
-        SafeRelease(vd->RtvDescHeap);
-
-        for (UINT i = 0; i < bd->numFramesInFlight; i++)
-        {
-            SafeRelease(vd->FrameCtx[i].RenderTarget);
-            SafeRelease(vd->FrameCtx[i].CommandAllocator);
-            ImGui_ImplDX12_DestroyRenderBuffers(&vd->FrameRenderBuffers[i]);
-        }
-        IM_DELETE(vd);
-    }
-    viewport->RendererUserData = nullptr;
-}
-
-static void ImGui_ImplDX12_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)viewport->RendererUserData;
-
-    ImGui_WaitForPendingOperations(vd);
-
-    for (UINT i = 0; i < bd->numFramesInFlight; i++)
-        SafeRelease(vd->FrameCtx[i].RenderTarget);
-
-    if (vd->SwapChain)
-    {
-        ID3D12Resource* back_buffer = nullptr;
-        DXGI_SWAP_CHAIN_DESC1 desc = {};
-        vd->SwapChain->GetDesc1(&desc);
-        vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, desc.Format, desc.Flags);
-        for (UINT i = 0; i < bd->numFramesInFlight; i++)
-        {
-            vd->SwapChain->GetBuffer(i, IID_PPV_ARGS(&back_buffer));
-            bd->pd3dDevice->CreateRenderTargetView(back_buffer, nullptr, vd->FrameCtx[i].RenderTargetCpuDescriptors);
-            vd->FrameCtx[i].RenderTarget = back_buffer;
-        }
-    }
-}
-
-static void ImGui_ImplDX12_RenderWindow(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)viewport->RendererUserData;
-
-    ImGui_ImplDX12_FrameContext* frame_context = ImGui_WaitForNextFrameContext(vd);
-    UINT back_buffer_idx = vd->SwapChain->GetCurrentBackBufferIndex();
-
-    const ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
-    D3D12_RESOURCE_BARRIER barrier = {};
-    barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
-    barrier.Flags = D3D12_RESOURCE_BARRIER_FLAG_NONE;
-    barrier.Transition.pResource = vd->FrameCtx[back_buffer_idx].RenderTarget;
-    barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
-    barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_PRESENT;
-    barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_RENDER_TARGET;
-
-    // Draw
-    ID3D12GraphicsCommandList* cmd_list = vd->CommandList;
-
-    frame_context->CommandAllocator->Reset();
-    cmd_list->Reset(frame_context->CommandAllocator, nullptr);
-    cmd_list->ResourceBarrier(1, &barrier);
-    cmd_list->OMSetRenderTargets(1, &vd->FrameCtx[back_buffer_idx].RenderTargetCpuDescriptors, FALSE, nullptr);
-    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
-        cmd_list->ClearRenderTargetView(vd->FrameCtx[back_buffer_idx].RenderTargetCpuDescriptors, (const float*)&clear_color, 0, nullptr);
-    cmd_list->SetDescriptorHeaps(1, &bd->pd3dSrvDescHeap);
-
-    ImGui_ImplDX12_RenderDrawData(viewport->DrawData, cmd_list);
-
-    barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_RENDER_TARGET;
-    barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_PRESENT;
-    cmd_list->ResourceBarrier(1, &barrier);
-    cmd_list->Close();
-
-    vd->CommandQueue->ExecuteCommandLists(1, (ID3D12CommandList* const*)&cmd_list);
-
-    HRESULT hr = vd->CommandQueue->Signal(bd->Fence, ++bd->FenceLastSignaledValue);
-    IM_ASSERT(hr == S_OK);
-    frame_context->FenceValue = bd->FenceLastSignaledValue;
-}
-
-static void ImGui_ImplDX12_SwapBuffers(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)viewport->RendererUserData;
-
-    vd->SwapChain->Present(0, bd->tearingSupport ? DXGI_PRESENT_ALLOW_TEARING : 0);
-}
-
-void ImGui_ImplDX12_InitMultiViewportSupport()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_CreateWindow = ImGui_ImplDX12_CreateWindow;
-    platform_io.Renderer_DestroyWindow = ImGui_ImplDX12_DestroyWindow;
-    platform_io.Renderer_SetWindowSize = ImGui_ImplDX12_SetWindowSize;
-    platform_io.Renderer_RenderWindow = ImGui_ImplDX12_RenderWindow;
-    platform_io.Renderer_SwapBuffers = ImGui_ImplDX12_SwapBuffers;
-}
-
-void ImGui_ImplDX12_ShutdownMultiViewportSupport()
-{
-    ImGui::DestroyPlatformWindows();
-}
-
 //-----------------------------------------------------------------------------
 
 #endif // #ifndef IMGUI_DISABLE

backends/imgui_impl_dx12.h

@@ -6,7 +6,6 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // The aim of imgui_impl_dx12.h/.cpp is to be usable in your engine without any modification.
 // IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/

backends/imgui_impl_dx9.cpp

@@ -6,7 +6,6 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: IMGUI_USE_BGRA_PACKED_COLOR support, as this is the optimal color encoding for DirectX9.
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -18,7 +17,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. (#9378)
 //  2026-03-19: Fixed issue in ImGui_ImplDX9_UpdateTexture() if ImTextureID_Invalid is defined to be != 0, which became the default since 2026-03-12. (#9295, #9310)
 //  2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
 //  2025-06-11: DirectX9: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas.
@@ -90,12 +89,6 @@ static ImGui_ImplDX9_Data* ImGui_ImplDX9_GetBackendData()
     return ImGui::GetCurrentContext() ? (ImGui_ImplDX9_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
-// Forward Declarations
-static void ImGui_ImplDX9_InitMultiViewportSupport();
-static void ImGui_ImplDX9_ShutdownMultiViewportSupport();
-static void ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows();
-static void ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows();
-
 // Functions
 static void ImGui_ImplDX9_SetupRenderState(ImDrawData* draw_data)
 {
@@ -170,6 +163,11 @@ static void ImGui_ImplDX9_SetupRenderState(ImDrawData* draw_data)
     }
 }
 
+// Draw callbacks
+static void ImGui_ImplDX9_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)    {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+static void ImGui_ImplDX9_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)    { ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData(); bd->pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR); bd->pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR); }
+static void ImGui_ImplDX9_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)   { ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData(); bd->pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_POINT); bd->pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_POINT); }
+
 // Render function.
 void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
 {
@@ -192,14 +190,14 @@ void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
     {
         if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; }
         bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
-        if (device->CreateVertexBuffer(bd->VertexBufferSize * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &bd->pVB, nullptr) < 0)
+        if (device->CreateVertexBuffer((UINT)bd->VertexBufferSize * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &bd->pVB, nullptr) < 0)
             return;
     }
     if (!bd->pIB || bd->IndexBufferSize < draw_data->TotalIdxCount)
     {
         if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; }
         bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
-        if (device->CreateIndexBuffer(bd->IndexBufferSize * sizeof(ImDrawIdx), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, sizeof(ImDrawIdx) == 2 ? D3DFMT_INDEX16 : D3DFMT_INDEX32, D3DPOOL_DEFAULT, &bd->pIB, nullptr) < 0)
+        if (device->CreateIndexBuffer((UINT)bd->IndexBufferSize * sizeof(ImDrawIdx), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, sizeof(ImDrawIdx) == 2 ? D3DFMT_INDEX16 : D3DFMT_INDEX32, D3DPOOL_DEFAULT, &bd->pIB, nullptr) < 0)
             return;
     }
 
@@ -277,8 +275,7 @@ void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
             if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplDX9_DrawCallback_ResetRenderState)
                     ImGui_ImplDX9_SetupRenderState(draw_data);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -305,11 +302,6 @@ void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
         global_vtx_offset += draw_list->VtxBuffer.Size;
     }
 
-    // When using multi-viewports, it appears that there's an odd logic in DirectX9 which prevent subsequent windows
-    // from rendering until the first window submits at least one draw call, even once. That's our workaround. (see #2560)
-    if (global_vtx_offset == 0)
-        bd->pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 0, 0, 0);
-
     // Restore the DX9 transform
     device->SetTransform(D3DTS_WORLD, &last_world);
     device->SetTransform(D3DTS_VIEW, &last_view);
@@ -338,50 +330,6 @@ static bool ImGui_ImplDX9_CheckFormatSupport(LPDIRECT3DDEVICE9 pDevice, D3DFORMA
     return support;
 }
 
-bool ImGui_ImplDX9_Init(IDirect3DDevice9* device)
-{
-    ImGuiIO& io = ImGui::GetIO();
-    IMGUI_CHECKVERSION();
-    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
-
-    // Setup backend capabilities flags
-    ImGui_ImplDX9_Data* bd = IM_NEW(ImGui_ImplDX9_Data)();
-    io.BackendRendererUserData = (void*)bd;
-    io.BackendRendererName = "imgui_impl_dx9";
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
-
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_TextureMaxWidth = platform_io.Renderer_TextureMaxHeight = 4096;
-
-    bd->pd3dDevice = device;
-    bd->pd3dDevice->AddRef();
-    bd->HasRgbaSupport = ImGui_ImplDX9_CheckFormatSupport(bd->pd3dDevice, D3DFMT_A8B8G8R8);
-
-    ImGui_ImplDX9_InitMultiViewportSupport();
-
-    return true;
-}
-
-void ImGui_ImplDX9_Shutdown()
-{
-    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
-    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
-    ImGuiIO& io = ImGui::GetIO();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-
-    ImGui_ImplDX9_ShutdownMultiViewportSupport();
-    ImGui_ImplDX9_InvalidateDeviceObjects();
-    if (bd->pd3dDevice) { bd->pd3dDevice->Release(); }
-
-    io.BackendRendererName = nullptr;
-    io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasViewports);
-    platform_io.ClearRendererHandlers();
-    IM_DELETE(bd);
-}
-
 // Convert RGBA32 to BGRA32 (because RGBA32 is not well supported by DX9 devices)
 static void ImGui_ImplDX9_CopyTextureRegion(bool tex_use_colors, const ImU32* src, int src_pitch, ImU32* dst, int dst_pitch, int w, int h)
 {
@@ -467,7 +415,6 @@ bool ImGui_ImplDX9_CreateDeviceObjects()
     ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
     if (!bd || !bd->pd3dDevice)
         return false;
-    ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows();
     return true;
 }
 
@@ -486,7 +433,6 @@ void ImGui_ImplDX9_InvalidateDeviceObjects()
         }
     if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; }
     if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; }
-    ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows();
 }
 
 void ImGui_ImplDX9_NewFrame()
@@ -496,146 +442,48 @@ void ImGui_ImplDX9_NewFrame()
     IM_UNUSED(bd);
 }
 
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
 
-// Helper structure we store in the void* RendererUserData field of each ImGuiViewport to easily retrieve our backend data.
-struct ImGui_ImplDX9_ViewportData
+bool ImGui_ImplDX9_Init(IDirect3DDevice9* device)
 {
-    IDirect3DSwapChain9*    SwapChain;
-    D3DPRESENT_PARAMETERS   d3dpp;
+    ImGuiIO& io = ImGui::GetIO();
+    IMGUI_CHECKVERSION();
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
-    ImGui_ImplDX9_ViewportData()  { SwapChain = nullptr; ZeroMemory(&d3dpp, sizeof(D3DPRESENT_PARAMETERS)); }
-    ~ImGui_ImplDX9_ViewportData() { IM_ASSERT(SwapChain == nullptr); }
-};
+    // Setup backend capabilities flags
+    ImGui_ImplDX9_Data* bd = IM_NEW(ImGui_ImplDX9_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_dx9";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
 
-static void ImGui_ImplDX9_CreateWindow(ImGuiViewport* viewport)
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.Renderer_TextureMaxWidth = platform_io.Renderer_TextureMaxHeight = 4096;
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplDX9_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplDX9_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplDX9_DrawCallback_SetSamplerNearest;
+
+    bd->pd3dDevice = device;
+    bd->pd3dDevice->AddRef();
+    bd->HasRgbaSupport = ImGui_ImplDX9_CheckFormatSupport(bd->pd3dDevice, D3DFMT_A8B8G8R8);
+
+    return true;
+}
+
+void ImGui_ImplDX9_Shutdown()
 {
     ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
-    ImGui_ImplDX9_ViewportData* vd = IM_NEW(ImGui_ImplDX9_ViewportData)();
-    viewport->RendererUserData = vd;
-
-    // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL's WindowID).
-    // Some backends will leave PlatformHandleRaw == 0, in which case we assume PlatformHandle will contain the HWND.
-    HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
-    IM_ASSERT(hwnd != 0);
-
-    ZeroMemory(&vd->d3dpp, sizeof(D3DPRESENT_PARAMETERS));
-    vd->d3dpp.Windowed = TRUE;
-    vd->d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
-    vd->d3dpp.BackBufferWidth = (UINT)viewport->Size.x;
-    vd->d3dpp.BackBufferHeight = (UINT)viewport->Size.y;
-    vd->d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
-    vd->d3dpp.hDeviceWindow = hwnd;
-    vd->d3dpp.EnableAutoDepthStencil = FALSE;
-    vd->d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
-    vd->d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;   // Present without vsync
-
-    HRESULT hr = bd->pd3dDevice->CreateAdditionalSwapChain(&vd->d3dpp, &vd->SwapChain); IM_UNUSED(hr);
-    IM_ASSERT(hr == D3D_OK);
-    IM_ASSERT(vd->SwapChain != nullptr);
-}
-
-static void ImGui_ImplDX9_DestroyWindow(ImGuiViewport* viewport)
-{
-    // The main viewport (owned by the application) will always have RendererUserData == 0 since we didn't create the data for it.
-    if (ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData)
-    {
-        if (vd->SwapChain)
-            vd->SwapChain->Release();
-        vd->SwapChain = nullptr;
-        ZeroMemory(&vd->d3dpp, sizeof(D3DPRESENT_PARAMETERS));
-        IM_DELETE(vd);
-    }
-    viewport->RendererUserData = nullptr;
-}
-
-static void ImGui_ImplDX9_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
-    ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData;
-    if (vd->SwapChain)
-    {
-        vd->SwapChain->Release();
-        vd->SwapChain = nullptr;
-        vd->d3dpp.BackBufferWidth = (UINT)size.x;
-        vd->d3dpp.BackBufferHeight = (UINT)size.y;
-        HRESULT hr = bd->pd3dDevice->CreateAdditionalSwapChain(&vd->d3dpp, &vd->SwapChain); IM_UNUSED(hr);
-        IM_ASSERT(hr == D3D_OK);
-    }
-}
-
-static void ImGui_ImplDX9_RenderWindow(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
-    ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData;
-    ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
-
-    LPDIRECT3DSURFACE9 render_target = nullptr;
-    LPDIRECT3DSURFACE9 last_render_target = nullptr;
-    LPDIRECT3DSURFACE9 last_depth_stencil = nullptr;
-    vd->SwapChain->GetBackBuffer(0, D3DBACKBUFFER_TYPE_MONO, &render_target);
-    bd->pd3dDevice->GetRenderTarget(0, &last_render_target);
-    bd->pd3dDevice->GetDepthStencilSurface(&last_depth_stencil);
-    bd->pd3dDevice->SetRenderTarget(0, render_target);
-    bd->pd3dDevice->SetDepthStencilSurface(nullptr);
-
-    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
-    {
-        D3DCOLOR clear_col_dx = D3DCOLOR_RGBA((int)(clear_color.x*255.0f), (int)(clear_color.y*255.0f), (int)(clear_color.z*255.0f), (int)(clear_color.w*255.0f));
-        bd->pd3dDevice->Clear(0, nullptr, D3DCLEAR_TARGET, clear_col_dx, 1.0f, 0);
-    }
-
-    ImGui_ImplDX9_RenderDrawData(viewport->DrawData);
-
-    // Restore render target
-    bd->pd3dDevice->SetRenderTarget(0, last_render_target);
-    bd->pd3dDevice->SetDepthStencilSurface(last_depth_stencil);
-    render_target->Release();
-    last_render_target->Release();
-    if (last_depth_stencil) last_depth_stencil->Release();
-}
-
-static void ImGui_ImplDX9_SwapBuffers(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData;
-    HRESULT hr = vd->SwapChain->Present(nullptr, nullptr, vd->d3dpp.hDeviceWindow, nullptr, 0);
-    // Let main application handle D3DERR_DEVICELOST by resetting the device.
-    IM_ASSERT(SUCCEEDED(hr) || hr == D3DERR_DEVICELOST);
-}
-
-static void ImGui_ImplDX9_InitMultiViewportSupport()
-{
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_CreateWindow = ImGui_ImplDX9_CreateWindow;
-    platform_io.Renderer_DestroyWindow = ImGui_ImplDX9_DestroyWindow;
-    platform_io.Renderer_SetWindowSize = ImGui_ImplDX9_SetWindowSize;
-    platform_io.Renderer_RenderWindow = ImGui_ImplDX9_RenderWindow;
-    platform_io.Renderer_SwapBuffers = ImGui_ImplDX9_SwapBuffers;
-}
 
-static void ImGui_ImplDX9_ShutdownMultiViewportSupport()
-{
-    ImGui::DestroyPlatformWindows();
-}
+    ImGui_ImplDX9_InvalidateDeviceObjects();
+    if (bd->pd3dDevice) { bd->pd3dDevice->Release(); }
 
-static void ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    for (int i = 1; i < platform_io.Viewports.Size; i++)
-        if (!platform_io.Viewports[i]->RendererUserData)
-            ImGui_ImplDX9_CreateWindow(platform_io.Viewports[i]);
-}
-
-static void ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    for (int i = 1; i < platform_io.Viewports.Size; i++)
-        if (platform_io.Viewports[i]->RendererUserData)
-            ImGui_ImplDX9_DestroyWindow(platform_io.Viewports[i]);
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
+    platform_io.ClearRendererHandlers();
+    IM_DELETE(bd);
 }
 
 //-----------------------------------------------------------------------------

backends/imgui_impl_dx9.h

@@ -6,7 +6,6 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: IMGUI_USE_BGRA_PACKED_COLOR support, as this is the optimal color encoding for DirectX9.
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_glfw.cpp

@@ -9,12 +9,10 @@
 //  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy GLFW_KEY_* values are obsolete since 1.87 and not supported since 1.91.5]
 //  [X] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors) with GLFW 3.1+. Resizing cursors requires GLFW 3.4+! Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
-//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 //  [X] Multiple Dear ImGui contexts support.
 // Missing features or Issues:
 //  [ ] Platform: Touch events are only correctly identified as Touch on Windows. This create issues with some interactions. GLFW doesn't provide a way to identify touch inputs from mouse inputs, we cannot call io.AddMouseSourceEvent() to identify the source. We provide a Windows-specific workaround.
 //  [ ] Platform: Missing ImGuiMouseCursor_Wait and ImGuiMouseCursor_Progress cursors.
-//  [ ] Platform: Multi-viewport: Missing ImGuiBackendFlags_HasParentViewport support. The viewport->ParentViewportID field is ignored, and therefore io.ConfigViewportsNoDefaultParent has no effect either.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -31,26 +29,19 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2026-04-21: Added a Win32-specific implementation of ImGui_ImplGlfw_GetContentScaleXXXX functions for legacy GLFW 3.2.
 //  2026-03-25: Mouse cursor is properly restored if changed by user app/code while using glfwSetInputMode(..., GLFW_CURSOR_DISABLED) or ImGuiConfigFlags_NoMouseCursorChange. Amend change from 2025-12-10.
 //  2026-02-10: Try to set IMGUI_IMPL_GLFW_DISABLE_X11 / IMGUI_IMPL_GLFW_DISABLE_WAYLAND automatically if corresponding headers are not accessible. (#9225)
-//  2026-01-25: [Docking] Improve workarounds for cases where GLFW is unable to provide any reliable monitor info. Preserve existing monitor list when none of the new one is valid. (#9195, #7902, #5683)
-//  2026-01-18: [Docking] Dynamically load X11 functions to avoid -lx11 linking requirement introduced on 2025-09-10.
 //  2025-12-12: Added IMGUI_IMPL_GLFW_DISABLE_X11 / IMGUI_IMPL_GLFW_DISABLE_WAYLAND to forcefully disable either.
 //  2025-12-10: Avoid repeated glfwSetCursor()/glfwSetInputMode() calls when unnecessary. Lowers overhead for very high framerates (e.g. 10k+ FPS).
 //  2025-11-06: Lower minimum requirement to GLFW 3.0. Though a recent version e.g GLFW 3.4 is highly recommended.
 //  2025-09-18: Call platform_io.ClearPlatformHandlers() on shutdown.
 //  2025-09-15: Content Scales are always reported as 1.0 on Wayland. FramebufferScale are always reported as 1.0 on X11. (#8920, #8921)
-//  2025-09-10: [Docking] Improve multi-viewport behavior in tiling WMs on X11 via the ImGui_ImplGlfw_SetWindowFloating() function. Note: using GLFW backend on Linux/BSD etc. requires linking with -lX11. (#8884, #8474, #8289)
 //  2025-07-08: Made ImGui_ImplGlfw_GetContentScaleForWindow(), ImGui_ImplGlfw_GetContentScaleForMonitor() helpers return 1.0f on Emscripten and Android platforms, matching macOS logic. (#8742, #8733)
 //  2025-06-18: Added support for multiple Dear ImGui contexts. (#8676, #8239, #8069)
 //  2025-06-11: Added ImGui_ImplGlfw_GetContentScaleForWindow(GLFWwindow* window) and ImGui_ImplGlfw_GetContentScaleForMonitor(GLFWmonitor* monitor) helper to facilitate making DPI-aware apps.
-//  2025-05-15: [Docking] Add Platform_GetWindowFramebufferScale() handler, to allow varying Retina display density on multiple monitors.
-//  2025-04-26: [Docking] Disable multi-viewports under Wayland. (#8587)
 //  2025-03-10: Map GLFW_KEY_WORLD_1 and GLFW_KEY_WORLD_2 into ImGuiKey_Oem102.
 //  2025-03-03: Fixed clipboard handler assertion when using GLFW <= 3.2.1 compiled with asserts enabled.
-//  2025-02-21: [Docking] Update monitors and work areas information every frame, as the later may change regardless of monitor changes. (#8415)
-//  2024-11-05: [Docking] Added Linux workaround for spurious mouse up events emitted while dragging and creating new viewport. (#3158, #7733, #7922)
 //  2024-08-22: Moved some OS/backend related function pointers from ImGuiIO to ImGuiPlatformIO:
 //               - io.GetClipboardTextFn    -> platform_io.Platform_GetClipboardTextFn
 //               - io.SetClipboardTextFn    -> platform_io.Platform_SetClipboardTextFn
@@ -67,7 +58,6 @@
 //  2023-03-16: Inputs: Fixed key modifiers handling on secondary viewports (docking branch). Broken on 2023/01/04. (#6248, #6034)
 //  2023-03-14: Emscripten: Avoid using glfwGetError() and glfwGetGamepadState() which are not correctly implemented in Emscripten emulation. (#6240)
 //  2023-02-03: Emscripten: Registering custom low-level mouse wheel handler to get more accurate scrolling impulses on Emscripten. (#4019, #6096)
-//  2023-01-18: Handle unsupported glfwGetVideoMode() call on e.g. Emscripten.
 //  2023-01-04: Inputs: Fixed mods state on Linux when using Alt-GR text input (e.g. German keyboard layout), could lead to broken text input. Revert a 2022/01/17 change were we resumed using mods provided by GLFW, turns out they were faulty.
 //  2022-11-22: Perform a dummy glfwGetError() read to cancel missing names with glfwGetKeyName(). (#5908)
 //  2022-10-18: Perform a dummy glfwGetError() read to cancel missing mouse cursors errors. Using GLFW_VERSION_COMBINED directly. (#5785)
@@ -120,8 +110,6 @@
 #pragma clang diagnostic ignored "-Wsign-conversion"        // warning: implicit conversion changes signedness
 #pragma clang diagnostic ignored "-Wexit-time-destructors"  // warning: declaration requires an exit-time destructor     // exit-time destruction order is undefined. if MemFree() leads to users code that has been disabled before exit it might cause problems. ImGui coding style welcomes static/globals.
 #pragma clang diagnostic ignored "-Wglobal-constructors"    // warning: declaration requires a global destructor         // similar to above, not sure what the exact difference is.
-#elif defined(__GNUC__)
-#pragma GCC diagnostic ignored "-Wfloat-equal"              // warning: comparing floating-point with '==' or '!=' is unsafe
 #endif
 
 #if defined(__has_include)
@@ -159,13 +147,10 @@
 #elif GLFW_HAS_X11
 #ifndef GLFW_EXPOSE_NATIVE_X11      // for glfwGetX11Display(), glfwGetX11Window() on Freedesktop (Linux, BSD, etc.)
 #define GLFW_EXPOSE_NATIVE_X11
-#include <X11/Xatom.h>
-#include <dlfcn.h>              // for dlopen()
 #endif
 #include <GLFW/glfw3native.h>
-#undef Status                   // X11 headers are leaking this.
 #endif
-
+#undef Status                   // X11 headers are leaking this.
 #ifndef _WIN32
 #include <unistd.h>             // for usleep()
 #endif
@@ -184,29 +169,12 @@
 // We gather version tests as define in order to easily see which features are version-dependent.
 #define GLFW_VERSION_COMBINED           (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 + GLFW_VERSION_REVISION)
 #define GLFW_HAS_CREATECURSOR           (GLFW_VERSION_COMBINED >= 3100) // 3.1+ glfwCreateCursor()
-#define GLFW_HAS_WINDOW_TOPMOST         (GLFW_VERSION_COMBINED >= 3200) // 3.2+ GLFW_FLOATING
-#define GLFW_HAS_WINDOW_HOVERED         (GLFW_VERSION_COMBINED >= 3300) // 3.3+ GLFW_HOVERED
-#define GLFW_HAS_WINDOW_ALPHA           (GLFW_VERSION_COMBINED >= 3300) // 3.3+ glfwSetWindowOpacity
 #define GLFW_HAS_PER_MONITOR_DPI        (GLFW_VERSION_COMBINED >= 3300) // 3.3+ glfwGetMonitorContentScale
-#if defined(__EMSCRIPTEN__) || defined(__SWITCH__)                      // no Vulkan support in GLFW for Emscripten or homebrew Nintendo Switch
-#define GLFW_HAS_VULKAN                 (0)
-#else
-#define GLFW_HAS_VULKAN                 (GLFW_VERSION_COMBINED >= 3200) // 3.2+ glfwCreateWindowSurface
-#endif
-#define GLFW_HAS_FOCUS_WINDOW           (GLFW_VERSION_COMBINED >= 3200) // 3.2+ glfwFocusWindow
-#define GLFW_HAS_FOCUS_ON_SHOW          (GLFW_VERSION_COMBINED >= 3300) // 3.3+ GLFW_FOCUS_ON_SHOW
-#define GLFW_HAS_MONITOR_WORK_AREA      (GLFW_VERSION_COMBINED >= 3300) // 3.3+ glfwGetMonitorWorkarea
-#define GLFW_HAS_OSX_WINDOW_POS_FIX     (GLFW_VERSION_COMBINED >= 3301) // 3.3.1+ Fixed: Resizing window repositions it on MacOS #1553
 #ifdef GLFW_RESIZE_NESW_CURSOR          // Let's be nice to people who pulled GLFW between 2019-04-16 (3.4 define) and 2019-11-29 (cursors defines) // FIXME: Remove when GLFW 3.4 is released?
 #define GLFW_HAS_NEW_CURSORS            (GLFW_VERSION_COMBINED >= 3400) // 3.4+ GLFW_RESIZE_ALL_CURSOR, GLFW_RESIZE_NESW_CURSOR, GLFW_RESIZE_NWSE_CURSOR, GLFW_NOT_ALLOWED_CURSOR
 #else
 #define GLFW_HAS_NEW_CURSORS            (0)
 #endif
-#ifdef GLFW_MOUSE_PASSTHROUGH           // Let's be nice to people who pulled GLFW between 2019-04-16 (3.4 define) and 2020-07-17 (passthrough)
-#define GLFW_HAS_MOUSE_PASSTHROUGH      (GLFW_VERSION_COMBINED >= 3400) // 3.4+ GLFW_MOUSE_PASSTHROUGH
-#else
-#define GLFW_HAS_MOUSE_PASSTHROUGH      (0)
-#endif
 #define GLFW_HAS_GAMEPAD_API            (GLFW_VERSION_COMBINED >= 3300) // 3.3+ glfwGetGamepadState() new api
 #define GLFW_HAS_GETKEYNAME             (GLFW_VERSION_COMBINED >= 3200) // 3.2+ glfwGetKeyName()
 #define GLFW_HAS_GETERROR               (GLFW_VERSION_COMBINED >= 3300) // 3.3+ glfwGetError()
@@ -229,13 +197,6 @@ enum GlfwClientApi
     GlfwClientApi_Unknown,  // Anything else fits here.
 };
 
-#if GLFW_HAS_X11
-typedef Atom (*PFN_XInternAtom)(Display*, const char* ,Bool);
-typedef int  (*PFN_XChangeProperty)(Display*, Window, Atom, Atom, int, int, const unsigned char*, int);
-typedef int  (*PFN_XChangeWindowAttributes)(Display*, Window, unsigned long, XSetWindowAttributes*);
-typedef int  (*PFN_XFlush)(Display*);
-#endif
-
 // GLFW data
 struct ImGui_ImplGlfw_Data
 {
@@ -248,10 +209,7 @@ struct ImGui_ImplGlfw_Data
     GLFWcursor*             MouseCursors[ImGuiMouseCursor_COUNT];
     GLFWcursor*             LastMouseCursor;
 #endif
-    bool                    MouseIgnoreButtonUpWaitForFocusLoss;
-    bool                    MouseIgnoreButtonUp;
     ImVec2                  LastValidMousePos;
-    GLFWwindow*             KeyOwnerWindows[GLFW_KEY_LAST];
     bool                    IsWayland;
     bool                    InstalledCallbacks;
     bool                    CallbacksChainForAllWindows;
@@ -273,15 +231,6 @@ struct ImGui_ImplGlfw_Data
     WNDPROC                 PrevWndProc;
 #endif
 
-#if GLFW_HAS_X11
-    // Module and function pointers loaded at initialization to avoid linking statically with X11.
-    void*                       X11Module;
-    PFN_XInternAtom             XInternAtom;
-    PFN_XChangeProperty         XChangeProperty;
-    PFN_XChangeWindowAttributes XChangeWindowAttributes;
-    PFN_XFlush                  XFlush;
-#endif
-
     ImGui_ImplGlfw_Data()   { memset((void*)this, 0, sizeof(*this)); }
 };
 
@@ -305,11 +254,6 @@ static ImGui_ImplGlfw_Data* ImGui_ImplGlfw_GetBackendData(GLFWwindow* window)
     return (ImGui_ImplGlfw_Data*)ImGui::GetIO(ctx).BackendPlatformUserData;
 }
 
-// Forward Declarations
-static void ImGui_ImplGlfw_UpdateMonitors();
-static void ImGui_ImplGlfw_InitMultiViewportSupport();
-static void ImGui_ImplGlfw_ShutdownMultiViewportSupport();
-
 // Functions
 static bool ImGui_ImplGlfw_IsWayland()
 {
@@ -480,10 +424,6 @@ void ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int acti
     if (bd->PrevUserCallbackMousebutton != nullptr && ImGui_ImplGlfw_ShouldChainCallback(bd, window))
         bd->PrevUserCallbackMousebutton(window, button, action, mods);
 
-    // Workaround for Linux: ignore mouse up events which are following an focus loss following a viewport creation
-    if (bd->MouseIgnoreButtonUp && action == GLFW_RELEASE)
-        return;
-
     ImGuiIO& io = ImGui::GetIO(bd->Context);
     ImGui_ImplGlfw_UpdateKeyModifiers(io, window);
     if (button >= 0 && button < ImGuiMouseButton_COUNT)
@@ -551,9 +491,6 @@ void ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int keycode, int scancode, i
     ImGuiIO& io = ImGui::GetIO(bd->Context);
     ImGui_ImplGlfw_UpdateKeyModifiers(io, window);
 
-    if (keycode >= 0 && keycode < IM_COUNTOF(bd->KeyOwnerWindows))
-        bd->KeyOwnerWindows[keycode] = (action == GLFW_PRESS) ? window : nullptr;
-
     keycode = ImGui_ImplGlfw_TranslateUntranslatedKey(keycode, scancode);
 
     ImGuiKey imgui_key = ImGui_ImplGlfw_KeyToImGuiKey(keycode, scancode);
@@ -567,10 +504,6 @@ void ImGui_ImplGlfw_WindowFocusCallback(GLFWwindow* window, int focused)
     if (bd->PrevUserCallbackWindowFocus != nullptr && ImGui_ImplGlfw_ShouldChainCallback(bd, window))
         bd->PrevUserCallbackWindowFocus(window, focused);
 
-    // Workaround for Linux: when losing focus with MouseIgnoreButtonUpWaitForFocusLoss set, we will temporarily ignore subsequent Mouse Up events
-    bd->MouseIgnoreButtonUp = (bd->MouseIgnoreButtonUpWaitForFocusLoss && focused == 0);
-    bd->MouseIgnoreButtonUpWaitForFocusLoss = false;
-
     ImGuiIO& io = ImGui::GetIO(bd->Context);
     io.AddFocusEvent(focused != 0);
 }
@@ -582,13 +515,6 @@ void ImGui_ImplGlfw_CursorPosCallback(GLFWwindow* window, double x, double y)
         bd->PrevUserCallbackCursorPos(window, x, y);
 
     ImGuiIO& io = ImGui::GetIO(bd->Context);
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        int window_x, window_y;
-        glfwGetWindowPos(window, &window_x, &window_y);
-        x += window_x;
-        y += window_y;
-    }
     io.AddMousePosEvent((float)x, (float)y);
     bd->LastValidMousePos = ImVec2((float)x, (float)y);
 }
@@ -627,7 +553,7 @@ void ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c)
 
 void ImGui_ImplGlfw_MonitorCallback(GLFWmonitor*, int)
 {
-    // This function is technically part of the API even if we stopped using the callback, so leaving it around.
+    // Unused in 'master' branch but 'docking' branch will use this, so we declare it ahead of it so if you have to install callbacks you can install this one too.
 }
 
 #ifdef EMSCRIPTEN_USE_EMBEDDED_GLFW3
@@ -650,7 +576,35 @@ static EM_BOOL ImGui_ImplEmscripten_WheelCallback(int, const EmscriptenWheelEven
 #endif
 
 #ifdef _WIN32
-static LRESULT CALLBACK ImGui_ImplGlfw_WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
+// GLFW doesn't allow to distinguish Mouse vs TouchScreen vs Pen.
+// Add support for Win32 (based on imgui_impl_win32), because we rely on _TouchScreen info to trickle inputs differently.
+static ImGuiMouseSource GetMouseSourceFromMessageExtraInfo()
+{
+    LPARAM extra_info = ::GetMessageExtraInfo();
+    if ((extra_info & 0xFFFFFF80) == 0xFF515700)
+        return ImGuiMouseSource_Pen;
+    if ((extra_info & 0xFFFFFF80) == 0xFF515780)
+        return ImGuiMouseSource_TouchScreen;
+    return ImGuiMouseSource_Mouse;
+}
+static LRESULT CALLBACK ImGui_ImplGlfw_WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
+{
+    ImGui_ImplGlfw_Data* bd = (ImGui_ImplGlfw_Data*)::GetPropA(hWnd, "IMGUI_BACKEND_DATA");
+    ImGuiIO& io = ImGui::GetIO(bd->Context);
+
+    switch (msg)
+    {
+    case WM_MOUSEMOVE: case WM_NCMOUSEMOVE:
+    case WM_LBUTTONDOWN: case WM_LBUTTONDBLCLK: case WM_LBUTTONUP:
+    case WM_RBUTTONDOWN: case WM_RBUTTONDBLCLK: case WM_RBUTTONUP:
+    case WM_MBUTTONDOWN: case WM_MBUTTONDBLCLK: case WM_MBUTTONUP:
+    case WM_XBUTTONDOWN: case WM_XBUTTONDBLCLK: case WM_XBUTTONUP:
+        io.AddMouseSourceEvent(GetMouseSourceFromMessageExtraInfo());
+        break;
+    default: break;
+    }
+    return ::CallWindowProcW(bd->PrevWndProc, hWnd, msg, wParam, lParam);
+}
 #endif
 
 void ImGui_ImplGlfw_InstallCallbacks(GLFWwindow* window)
@@ -730,20 +684,6 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
 #endif
     io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos;          // We can honor io.WantSetMousePos requests (optional, rarely used)
 
-    bool has_viewports = false;
-#ifndef __EMSCRIPTEN__
-    has_viewports = true;
-#if GLFW_HAS_GETPLATFORM
-    if (glfwGetPlatform() == GLFW_PLATFORM_WAYLAND)
-        has_viewports = false;
-#endif
-    if (has_viewports)
-        io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports;  // We can create multi-viewports on the Platform side (optional)
-#endif
-#if GLFW_HAS_MOUSE_PASSTHROUGH || GLFW_HAS_WINDOW_HOVERED
-    io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport; // We can call io.AddMouseViewportEvent() with correct data (optional)
-#endif
-
     bd->Context = ImGui::GetCurrentContext();
     bd->Window = window;
     bd->Time = 0.0;
@@ -795,11 +735,6 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
     if (install_callbacks)
         ImGui_ImplGlfw_InstallCallbacks(window);
 
-    // Update monitor a first time during init
-    // (note: monitor callback are broken in GLFW 3.2 and earlier, see github.com/glfw/glfw/issues/784)
-    ImGui_ImplGlfw_UpdateMonitors();
-    glfwSetMonitorCallback(ImGui_ImplGlfw_MonitorCallback);
-
     // Set platform dependent data in viewport
     ImGuiViewport* main_viewport = ImGui::GetMainViewport();
     main_viewport->PlatformHandle = (void*)bd->Window;
@@ -810,8 +745,6 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
 #else
     IM_UNUSED(main_viewport);
 #endif
-    if (has_viewports)
-        ImGui_ImplGlfw_InitMultiViewportSupport();
 
     // Windows: register a WndProc hook so we can intercept some messages.
 #ifdef _WIN32
@@ -822,26 +755,6 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
     ::SetWindowLongPtrW((HWND)main_viewport->PlatformHandleRaw, GWLP_WNDPROC, (LONG_PTR)ImGui_ImplGlfw_WndProc);
 #endif
 
-#if GLFW_HAS_X11
-    if (!bd->IsWayland)
-    {
-        // Load X11 module dynamically. Copied from the way that GLFW does it in x11_init.c
-#if defined(__CYGWIN__)
-        const char* x11_module_path = "libX11-6.so";
-#elif defined(__OpenBSD__) || defined(__NetBSD__)
-        const char* x11_module_path = "libX11.so";
-#else
-        const char* x11_module_path = "libX11.so.6";
-#endif
-        bd->X11Module = dlopen(x11_module_path, RTLD_LAZY | RTLD_LOCAL);
-        bd->XInternAtom = (PFN_XInternAtom)dlsym(bd->X11Module, "XInternAtom");
-        bd->XChangeProperty = (PFN_XChangeProperty)dlsym(bd->X11Module, "XChangeProperty");
-        bd->XChangeWindowAttributes = (PFN_XChangeWindowAttributes)dlsym(bd->X11Module, "XChangeWindowAttributes");
-        bd->XFlush = (PFN_XFlush)dlsym(bd->X11Module, "XFlush");
-        IM_ASSERT(bd->XInternAtom != nullptr && bd->XChangeProperty != nullptr && bd->XChangeWindowAttributes != nullptr && bd->XFlush != nullptr);
-    }
-#endif
-
     // Emscripten: the same application can run on various platforms, so we detect the Apple platform at runtime
     // to override io.ConfigMacOSXBehaviors from its default (which is always false in Emscripten).
 #ifdef __EMSCRIPTEN__
@@ -886,7 +799,6 @@ void ImGui_ImplGlfw_Shutdown()
     ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
-    ImGui_ImplGlfw_ShutdownMultiViewportSupport();
     if (bd->InstalledCallbacks)
         ImGui_ImplGlfw_RestoreCallbacks(bd->Window);
 #ifdef EMSCRIPTEN_USE_EMBEDDED_GLFW3
@@ -905,14 +817,9 @@ void ImGui_ImplGlfw_Shutdown()
     bd->PrevWndProc = nullptr;
 #endif
 
-#if GLFW_HAS_X11
-    if (bd->X11Module != nullptr)
-        dlclose(bd->X11Module);
-#endif
-
     io.BackendPlatformName = nullptr;
     io.BackendPlatformUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasSetMousePos | ImGuiBackendFlags_HasGamepad | ImGuiBackendFlags_PlatformHasViewports | ImGuiBackendFlags_HasMouseHoveredViewport);
+    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasSetMousePos | ImGuiBackendFlags_HasGamepad);
     platform_io.ClearPlatformHandlers();
     ImGui_ImplGlfw_ContextMap_Remove(bd->Window);
     IM_DELETE(bd);
@@ -922,15 +829,10 @@ static void ImGui_ImplGlfw_UpdateMouseData()
 {
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
     ImGuiIO& io = ImGui::GetIO();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
-    ImGuiID mouse_viewport_id = 0;
-    const ImVec2 mouse_pos_prev = io.MousePos;
-    for (int n = 0; n < platform_io.Viewports.Size; n++)
+    // (those braces are here to reduce diff with multi-viewports support in 'docking' branch)
     {
-        ImGuiViewport* viewport = platform_io.Viewports[n];
-        GLFWwindow* window = (GLFWwindow*)viewport->PlatformHandle;
-
+        GLFWwindow* window = bd->Window;
 #ifdef EMSCRIPTEN_USE_EMBEDDED_GLFW3
         const bool is_window_focused = true;
 #else
@@ -939,54 +841,19 @@ static void ImGui_ImplGlfw_UpdateMouseData()
         if (is_window_focused)
         {
             // (Optional) Set OS mouse position from Dear ImGui if requested (rarely used, only when io.ConfigNavMoveSetMousePos is enabled by user)
-            // When multi-viewports are enabled, all Dear ImGui positions are same as OS positions.
             if (io.WantSetMousePos)
-                glfwSetCursorPos(window, (double)(mouse_pos_prev.x - viewport->Pos.x), (double)(mouse_pos_prev.y - viewport->Pos.y));
+                glfwSetCursorPos(window, (double)io.MousePos.x, (double)io.MousePos.y);
 
             // (Optional) Fallback to provide mouse position when focused (ImGui_ImplGlfw_CursorPosCallback already provides this when hovered or captured)
             if (bd->MouseWindow == nullptr)
             {
                 double mouse_x, mouse_y;
                 glfwGetCursorPos(window, &mouse_x, &mouse_y);
-                if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-                {
-                    // Single viewport mode: mouse position in client window coordinates (io.MousePos is (0,0) when the mouse is on the upper-left corner of the app window)
-                    // Multi-viewport mode: mouse position in OS absolute coordinates (io.MousePos is (0,0) when the mouse is on the upper-left of the primary monitor)
-                    int window_x, window_y;
-                    glfwGetWindowPos(window, &window_x, &window_y);
-                    mouse_x += window_x;
-                    mouse_y += window_y;
-                }
                 bd->LastValidMousePos = ImVec2((float)mouse_x, (float)mouse_y);
                 io.AddMousePosEvent((float)mouse_x, (float)mouse_y);
             }
         }
-
-        // (Optional) When using multiple viewports: call io.AddMouseViewportEvent() with the viewport the OS mouse cursor is hovering.
-        // If ImGuiBackendFlags_HasMouseHoveredViewport is not set by the backend, Dear imGui will ignore this field and infer the information using its flawed heuristic.
-        // - [X] GLFW >= 3.3 backend ON WINDOWS ONLY does correctly ignore viewports with the _NoInputs flag (since we implement hit via our WndProc hook)
-        //       On other platforms we rely on the library fallbacking to its own search when reporting a viewport with _NoInputs flag.
-        // - [!] GLFW <= 3.2 backend CANNOT correctly ignore viewports with the _NoInputs flag, and CANNOT reported Hovered Viewport because of mouse capture.
-        //       Some backend are not able to handle that correctly. If a backend report an hovered viewport that has the _NoInputs flag (e.g. when dragging a window
-        //       for docking, the viewport has the _NoInputs flag in order to allow us to find the viewport under), then Dear ImGui is forced to ignore the value reported
-        //       by the backend, and use its flawed heuristic to guess the viewport behind.
-        // - [X] GLFW backend correctly reports this regardless of another viewport behind focused and dragged from (we need this to find a useful drag and drop target).
-        // FIXME: This is currently only correct on Win32. See what we do below with the WM_NCHITTEST, missing an equivalent for other systems.
-        // See https://github.com/glfw/glfw/issues/1236 if you want to help in making this a GLFW feature.
-#if GLFW_HAS_MOUSE_PASSTHROUGH
-        const bool window_no_input = (viewport->Flags & ImGuiViewportFlags_NoInputs) != 0;
-        glfwSetWindowAttrib(window, GLFW_MOUSE_PASSTHROUGH, window_no_input);
-#endif
-#if GLFW_HAS_MOUSE_PASSTHROUGH || GLFW_HAS_WINDOW_HOVERED
-        if (glfwGetWindowAttrib(window, GLFW_HOVERED))
-            mouse_viewport_id = viewport->ID;
-#else
-        // We cannot use bd->MouseWindow maintained from CursorEnter/Leave callbacks, because it is locked to the window capturing mouse.
-#endif
     }
-
-    if (io.BackendFlags & ImGuiBackendFlags_HasMouseHoveredViewport)
-        io.AddMouseViewportEvent(mouse_viewport_id);
 }
 
 static void ImGui_ImplGlfw_UpdateMouseCursor()
@@ -1000,10 +867,9 @@ static void ImGui_ImplGlfw_UpdateMouseCursor()
     }
 
     ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    for (int n = 0; n < platform_io.Viewports.Size; n++)
+    // (those braces are here to reduce diff with multi-viewports support in 'docking' branch)
     {
-        GLFWwindow* window = (GLFWwindow*)platform_io.Viewports[n]->PlatformHandle;
+        GLFWwindow* window = bd->Window;
         if (imgui_cursor == ImGuiMouseCursor_None || io.MouseDrawCursor)
         {
             if (bd->LastMouseCursor != nullptr)
@@ -1083,48 +949,15 @@ static void ImGui_ImplGlfw_UpdateGamepads()
     #undef MAP_ANALOG
 }
 
-static void ImGui_ImplGlfw_UpdateMonitors()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    int monitors_count = 0;
-    GLFWmonitor** glfw_monitors = glfwGetMonitors(&monitors_count);
-
-    bool updated_monitors = false;
-    for (int n = 0; n < monitors_count; n++)
-    {
-        ImGuiPlatformMonitor monitor;
-        int x, y;
-        glfwGetMonitorPos(glfw_monitors[n], &x, &y);
-        const GLFWvidmode* vid_mode = glfwGetVideoMode(glfw_monitors[n]);
-        if (vid_mode == nullptr)
-            continue; // Failed to get Video mode (e.g. Emscripten does not support this function)
-        if (vid_mode->width <= 0 || vid_mode->height <= 0)
-            continue; // Failed to query suitable monitor info (#9195)
-        monitor.MainPos = monitor.WorkPos = ImVec2((float)x, (float)y);
-        monitor.MainSize = monitor.WorkSize = ImVec2((float)vid_mode->width, (float)vid_mode->height);
-#if GLFW_HAS_MONITOR_WORK_AREA
-        int w, h;
-        glfwGetMonitorWorkarea(glfw_monitors[n], &x, &y, &w, &h);
-        if (w > 0 && h > 0) // Workaround a small GLFW issue reporting zero on monitor changes: https://github.com/glfw/glfw/pull/1761
-        {
-            monitor.WorkPos = ImVec2((float)x, (float)y);
-            monitor.WorkSize = ImVec2((float)w, (float)h);
-        }
+// For GFLW 3.2 + Windows: include a simplified non-monitor aware version of ImGui_ImplWin32_GetDpiScaleForMonitor().
+// This is merely a band-aid to make using GLFW 3.2 a little bit nicer, but prefer to use GLFW 3.3+ or the full correct functions from the Win32 backend.
+#if !GLFW_HAS_PER_MONITOR_DPI && defined(_WIN32) && !defined(NOGDI)
+static float   ImGui_ImplWin32_GetLegacyDpiScale()   { const HDC dc = ::GetDC(nullptr); UINT xdpi = ::GetDeviceCaps(dc, LOGPIXELSX); ::ReleaseDC(nullptr, dc); return (float)xdpi / 96.0f; }
+static void    glfwGetWindowContentScale(GLFWwindow*, float* x_scale, float* y_scale)   { *x_scale = *y_scale = ImGui_ImplWin32_GetLegacyDpiScale(); }
+static void    glfwGetMonitorContentScale(GLFWmonitor*, float* x_scale, float* y_scale) { *x_scale = *y_scale = ImGui_ImplWin32_GetLegacyDpiScale(); }
+#undef GLFW_HAS_PER_MONITOR_DPI
+#define GLFW_HAS_PER_MONITOR_DPI 1
 #endif
-        float scale = ImGui_ImplGlfw_GetContentScaleForMonitor(glfw_monitors[n]);
-        if (scale == 0.0f)
-            continue; // Some accessibility applications are declaring virtual monitors with a DPI of 0 (#7902)
-        monitor.DpiScale = scale;
-        monitor.PlatformHandle = (void*)glfw_monitors[n]; // [...] GLFW doc states: "guaranteed to be valid only until the monitor configuration changes"
-
-        // Preserve existing monitor list until a valid one is added.
-        // Happens on macOS sleeping (#5683) and seemingly occasionally on Windows (#9195)
-        if (!updated_monitors)
-            platform_io.Monitors.resize(0);
-        updated_monitors = true;
-        platform_io.Monitors.push_back(monitor);
-    }
-}
 
 // - On Windows the process needs to be marked DPI-aware!! SDL2 doesn't do it by default. You can call ::SetProcessDPIAware() or call ImGui_ImplWin32_EnableDpiAwareness() from Win32 backend.
 // - Apple platforms use FramebufferScale so we always return 1.0f.
@@ -1189,17 +1022,15 @@ void ImGui_ImplGlfw_NewFrame()
 
     // Setup main viewport size (every frame to accommodate for window resizing)
     ImGui_ImplGlfw_GetWindowSizeAndFramebufferScale(bd->Window, &io.DisplaySize, &io.DisplayFramebufferScale);
-    ImGui_ImplGlfw_UpdateMonitors();
 
     // Setup time step
     // (Accept glfwGetTime() not returning a monotonically increasing value. Seems to happens on disconnecting peripherals and probably on VMs and Emscripten, see #6491, #6189, #6114, #3644)
     double current_time = glfwGetTime();
     if (current_time <= bd->Time)
-        current_time = bd->Time + 0.00001f;
+        current_time = bd->Time + 0.00001;
     io.DeltaTime = bd->Time > 0.0 ? (float)(current_time - bd->Time) : (float)(1.0f / 60.0f);
     bd->Time = current_time;
 
-    bd->MouseIgnoreButtonUp = false;
     ImGui_ImplGlfw_UpdateMouseData();
     ImGui_ImplGlfw_UpdateMouseCursor();
 
@@ -1269,444 +1100,6 @@ void ImGui_ImplGlfw_InstallEmscriptenCallbacks(GLFWwindow* window, const char* c
 }
 #endif // #ifdef EMSCRIPTEN_USE_PORT_CONTRIB_GLFW3
 
-
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-// Helper structure we store in the void* PlatformUserData field of each ImGuiViewport to easily retrieve our backend data.
-struct ImGui_ImplGlfw_ViewportData
-{
-    GLFWwindow* Window;             // Stored in ImGuiViewport::PlatformHandle
-    bool        WindowOwned;
-    int         IgnoreWindowPosEventFrame;
-    int         IgnoreWindowSizeEventFrame;
-#ifdef _WIN32
-    WNDPROC     PrevWndProc;
-#endif
-
-    ImGui_ImplGlfw_ViewportData()  { memset((void*)this, 0, sizeof(*this)); IgnoreWindowSizeEventFrame = IgnoreWindowPosEventFrame = -1; }
-    ~ImGui_ImplGlfw_ViewportData() { IM_ASSERT(Window == nullptr); }
-};
-
-static void ImGui_ImplGlfw_WindowCloseCallback(GLFWwindow* window)
-{
-    if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle(window))
-        viewport->PlatformRequestClose = true;
-}
-
-// GLFW may dispatch window pos/size events after calling glfwSetWindowPos()/glfwSetWindowSize().
-// However: depending on the platform the callback may be invoked at different time:
-// - on Windows it appears to be called within the glfwSetWindowPos()/glfwSetWindowSize() call
-// - on Linux it is queued and invoked during glfwPollEvents()
-// Because the event doesn't always fire on glfwSetWindowXXX() we use a frame counter tag to only
-// ignore recent glfwSetWindowXXX() calls.
-static void ImGui_ImplGlfw_WindowPosCallback(GLFWwindow* window, int, int)
-{
-    if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle(window))
-    {
-        if (ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData)
-        {
-            bool ignore_event = (ImGui::GetFrameCount() <= vd->IgnoreWindowPosEventFrame + 1);
-            //data->IgnoreWindowPosEventFrame = -1;
-            if (ignore_event)
-                return;
-        }
-        viewport->PlatformRequestMove = true;
-    }
-}
-
-static void ImGui_ImplGlfw_WindowSizeCallback(GLFWwindow* window, int, int)
-{
-    if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle(window))
-    {
-        if (ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData)
-        {
-            bool ignore_event = (ImGui::GetFrameCount() <= vd->IgnoreWindowSizeEventFrame + 1);
-            //data->IgnoreWindowSizeEventFrame = -1;
-            if (ignore_event)
-                return;
-        }
-        viewport->PlatformRequestResize = true;
-    }
-}
-
-#if !defined(__APPLE__) && !defined(_WIN32) && !defined(__EMSCRIPTEN__) && GLFW_HAS_GETPLATFORM
-#define IMGUI_GLFW_HAS_SETWINDOWFLOATING
-static void ImGui_ImplGlfw_SetWindowFloating(ImGui_ImplGlfw_Data* bd, GLFWwindow* window)
-{
-#ifdef GLFW_EXPOSE_NATIVE_X11
-    if (glfwGetPlatform() == GLFW_PLATFORM_X11)
-    {
-        Display* display = glfwGetX11Display();
-        Window xwindow = glfwGetX11Window(window);
-        Atom wm_type = bd->XInternAtom(display, "_NET_WM_WINDOW_TYPE", False);
-        Atom wm_type_dialog = bd->XInternAtom(display, "_NET_WM_WINDOW_TYPE_DIALOG", False);
-        bd->XChangeProperty(display, xwindow, wm_type, XA_ATOM, 32, PropModeReplace, (unsigned char*)&wm_type_dialog, 1);
-        XSetWindowAttributes attrs;
-        attrs.override_redirect = False;
-        bd->XChangeWindowAttributes(display, xwindow, CWOverrideRedirect, &attrs);
-        bd->XFlush(display);
-    }
-#endif // GLFW_EXPOSE_NATIVE_X11
-#ifdef GLFW_EXPOSE_NATIVE_WAYLAND
-    // FIXME: Help needed, see #8884, #8474 for discussions about this.
-#endif // GLFW_EXPOSE_NATIVE_X11
-}
-#endif // IMGUI_GLFW_HAS_SETWINDOWFLOATING
-
-static void ImGui_ImplGlfw_CreateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    ImGui_ImplGlfw_ViewportData* vd = IM_NEW(ImGui_ImplGlfw_ViewportData)();
-    viewport->PlatformUserData = vd;
-
-    // Workaround for Linux: ignore mouse up events corresponding to losing focus of the previously focused window (#7733, #3158, #7922)
-#ifdef __linux__
-    bd->MouseIgnoreButtonUpWaitForFocusLoss = true;
-#endif
-
-    // GLFW 3.2 unfortunately always set focus on glfwCreateWindow() if GLFW_VISIBLE is set, regardless of GLFW_FOCUSED
-    // With GLFW 3.3, the hint GLFW_FOCUS_ON_SHOW fixes this problem
-    glfwWindowHint(GLFW_VISIBLE, false);
-    glfwWindowHint(GLFW_FOCUSED, false);
-#if GLFW_HAS_FOCUS_ON_SHOW
-    glfwWindowHint(GLFW_FOCUS_ON_SHOW, false);
-#endif
-    glfwWindowHint(GLFW_DECORATED, (viewport->Flags & ImGuiViewportFlags_NoDecoration) ? false : true);
-#if GLFW_HAS_WINDOW_TOPMOST
-    glfwWindowHint(GLFW_FLOATING, (viewport->Flags & ImGuiViewportFlags_TopMost) ? true : false);
-#endif
-    GLFWwindow* share_window = (bd->ClientApi == GlfwClientApi_OpenGL) ? bd->Window : nullptr;
-    vd->Window = glfwCreateWindow((int)viewport->Size.x, (int)viewport->Size.y, "No Title Yet", nullptr, share_window);
-    vd->WindowOwned = true;
-    ImGui_ImplGlfw_ContextMap_Add(vd->Window, bd->Context);
-    viewport->PlatformHandle = (void*)vd->Window;
-#ifdef IMGUI_GLFW_HAS_SETWINDOWFLOATING
-    ImGui_ImplGlfw_SetWindowFloating(bd, vd->Window);
-#endif
-#ifdef _WIN32
-    viewport->PlatformHandleRaw = glfwGetWin32Window(vd->Window);
-    ::SetPropA((HWND)viewport->PlatformHandleRaw, "IMGUI_BACKEND_DATA", bd);
-#elif defined(__APPLE__)
-    viewport->PlatformHandleRaw = (void*)glfwGetCocoaWindow(vd->Window);
-#endif
-    glfwSetWindowPos(vd->Window, (int)viewport->Pos.x, (int)viewport->Pos.y);
-
-    // Install GLFW callbacks for secondary viewports
-    glfwSetWindowFocusCallback(vd->Window, ImGui_ImplGlfw_WindowFocusCallback);
-    glfwSetCursorEnterCallback(vd->Window, ImGui_ImplGlfw_CursorEnterCallback);
-    glfwSetCursorPosCallback(vd->Window, ImGui_ImplGlfw_CursorPosCallback);
-    glfwSetMouseButtonCallback(vd->Window, ImGui_ImplGlfw_MouseButtonCallback);
-    glfwSetScrollCallback(vd->Window, ImGui_ImplGlfw_ScrollCallback);
-    glfwSetKeyCallback(vd->Window, ImGui_ImplGlfw_KeyCallback);
-    glfwSetCharCallback(vd->Window, ImGui_ImplGlfw_CharCallback);
-    glfwSetWindowCloseCallback(vd->Window, ImGui_ImplGlfw_WindowCloseCallback);
-    glfwSetWindowPosCallback(vd->Window, ImGui_ImplGlfw_WindowPosCallback);
-    glfwSetWindowSizeCallback(vd->Window, ImGui_ImplGlfw_WindowSizeCallback);
-    if (bd->ClientApi == GlfwClientApi_OpenGL)
-    {
-        glfwMakeContextCurrent(vd->Window);
-        glfwSwapInterval(0);
-    }
-}
-
-static void ImGui_ImplGlfw_DestroyWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    if (ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData)
-    {
-        if (vd->WindowOwned)
-        {
-#if !GLFW_HAS_MOUSE_PASSTHROUGH && GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
-            HWND hwnd = (HWND)viewport->PlatformHandleRaw;
-            ::RemovePropA(hwnd, "IMGUI_VIEWPORT");
-#endif
-
-            // Release any keys that were pressed in the window being destroyed and are still held down,
-            // because we will not receive any release events after window is destroyed.
-            for (int i = 0; i < IM_COUNTOF(bd->KeyOwnerWindows); i++)
-                if (bd->KeyOwnerWindows[i] == vd->Window)
-                    ImGui_ImplGlfw_KeyCallback(vd->Window, i, 0, GLFW_RELEASE, 0); // Later params are only used for main viewport, on which this function is never called.
-
-            ImGui_ImplGlfw_ContextMap_Remove(vd->Window);
-            glfwDestroyWindow(vd->Window);
-        }
-        vd->Window = nullptr;
-        IM_DELETE(vd);
-    }
-    viewport->PlatformUserData = viewport->PlatformHandle = nullptr;
-}
-
-static void ImGui_ImplGlfw_ShowWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-
-#if defined(_WIN32)
-    // GLFW hack: Hide icon from task bar
-    HWND hwnd = (HWND)viewport->PlatformHandleRaw;
-    if (viewport->Flags & ImGuiViewportFlags_NoTaskBarIcon)
-    {
-        LONG ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE);
-        ex_style &= ~WS_EX_APPWINDOW;
-        ex_style |= WS_EX_TOOLWINDOW;
-        ::SetWindowLong(hwnd, GWL_EXSTYLE, ex_style);
-    }
-
-    // GLFW hack: install WndProc for mouse source event and WM_NCHITTEST message handler.
-    ::SetPropA(hwnd, "IMGUI_VIEWPORT", viewport);
-    vd->PrevWndProc = (WNDPROC)::GetWindowLongPtrW(hwnd, GWLP_WNDPROC);
-    ::SetWindowLongPtrW(hwnd, GWLP_WNDPROC, (LONG_PTR)ImGui_ImplGlfw_WndProc);
-
-#if !GLFW_HAS_FOCUS_ON_SHOW
-    // GLFW hack: GLFW 3.2 has a bug where glfwShowWindow() also activates/focus the window.
-    // The fix was pushed to GLFW repository on 2018/01/09 and should be included in GLFW 3.3 via a GLFW_FOCUS_ON_SHOW window attribute.
-    // See https://github.com/glfw/glfw/issues/1189
-    // FIXME-VIEWPORT: Implement same work-around for Linux/OSX in the meanwhile.
-    if (viewport->Flags & ImGuiViewportFlags_NoFocusOnAppearing)
-    {
-        ::ShowWindow(hwnd, SW_SHOWNA);
-        return;
-    }
-#endif
-#endif
-
-    glfwShowWindow(vd->Window);
-}
-
-static ImVec2 ImGui_ImplGlfw_GetWindowPos(ImGuiViewport* viewport)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    int x = 0, y = 0;
-    glfwGetWindowPos(vd->Window, &x, &y);
-    return ImVec2((float)x, (float)y);
-}
-
-static void ImGui_ImplGlfw_SetWindowPos(ImGuiViewport* viewport, ImVec2 pos)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    vd->IgnoreWindowPosEventFrame = ImGui::GetFrameCount();
-    glfwSetWindowPos(vd->Window, (int)pos.x, (int)pos.y);
-}
-
-static ImVec2 ImGui_ImplGlfw_GetWindowSize(ImGuiViewport* viewport)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    int w = 0, h = 0;
-    glfwGetWindowSize(vd->Window, &w, &h);
-    return ImVec2((float)w, (float)h);
-}
-
-static void ImGui_ImplGlfw_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-#if defined(__APPLE__) && !GLFW_HAS_OSX_WINDOW_POS_FIX
-    // Native OS windows are positioned from the bottom-left corner on macOS, whereas on other platforms they are
-    // positioned from the upper-left corner. GLFW makes an effort to convert macOS style coordinates, however it
-    // doesn't handle it when changing size. We are manually moving the window in order for changes of size to be based
-    // on the upper-left corner.
-    int x, y, width, height;
-    glfwGetWindowPos(vd->Window, &x, &y);
-    glfwGetWindowSize(vd->Window, &width, &height);
-    glfwSetWindowPos(vd->Window, x, y - height + size.y);
-#endif
-    vd->IgnoreWindowSizeEventFrame = ImGui::GetFrameCount();
-    glfwSetWindowSize(vd->Window, (int)size.x, (int)size.y);
-}
-
-static ImVec2 ImGui_ImplGlfw_GetWindowFramebufferScale(ImGuiViewport* viewport)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    ImVec2 framebuffer_scale;
-    ImGui_ImplGlfw_GetWindowSizeAndFramebufferScale(vd->Window, nullptr, &framebuffer_scale);
-    return framebuffer_scale;
-}
-
-static void ImGui_ImplGlfw_SetWindowTitle(ImGuiViewport* viewport, const char* title)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    glfwSetWindowTitle(vd->Window, title);
-}
-
-static void ImGui_ImplGlfw_SetWindowFocus(ImGuiViewport* viewport)
-{
-#if GLFW_HAS_FOCUS_WINDOW
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    glfwFocusWindow(vd->Window);
-#else
-    // FIXME: What are the effect of not having this function? At the moment imgui doesn't actually call SetWindowFocus - we set that up ahead, will answer that question later.
-    (void)viewport;
-#endif
-}
-
-static bool ImGui_ImplGlfw_GetWindowFocus(ImGuiViewport* viewport)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    return glfwGetWindowAttrib(vd->Window, GLFW_FOCUSED) != 0;
-}
-
-static bool ImGui_ImplGlfw_GetWindowMinimized(ImGuiViewport* viewport)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    return glfwGetWindowAttrib(vd->Window, GLFW_ICONIFIED) != 0;
-}
-
-#if GLFW_HAS_WINDOW_ALPHA
-static void ImGui_ImplGlfw_SetWindowAlpha(ImGuiViewport* viewport, float alpha)
-{
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    glfwSetWindowOpacity(vd->Window, alpha);
-}
-#endif
-
-static void ImGui_ImplGlfw_RenderWindow(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    if (bd->ClientApi == GlfwClientApi_OpenGL)
-        glfwMakeContextCurrent(vd->Window);
-}
-
-static void ImGui_ImplGlfw_SwapBuffers(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    if (bd->ClientApi == GlfwClientApi_OpenGL)
-    {
-        glfwMakeContextCurrent(vd->Window);
-        glfwSwapBuffers(vd->Window);
-    }
-}
-
-//--------------------------------------------------------------------------------------------------------
-// Vulkan support (the Vulkan renderer needs to call a platform-side support function to create the surface)
-//--------------------------------------------------------------------------------------------------------
-
-// Avoid including <vulkan.h> so we can build without it
-#if GLFW_HAS_VULKAN
-#ifndef VULKAN_H_
-#define VK_DEFINE_HANDLE(object) typedef struct object##_T* object;
-#if defined(__LP64__) || defined(_WIN64) || defined(__x86_64__) || defined(_M_X64) || defined(__ia64) || defined (_M_IA64) || defined(__aarch64__) || defined(__powerpc64__)
-#define VK_DEFINE_NON_DISPATCHABLE_HANDLE(object) typedef struct object##_T *object;
-#else
-#define VK_DEFINE_NON_DISPATCHABLE_HANDLE(object) typedef uint64_t object;
-#endif
-VK_DEFINE_HANDLE(VkInstance)
-VK_DEFINE_NON_DISPATCHABLE_HANDLE(VkSurfaceKHR)
-struct VkAllocationCallbacks;
-enum VkResult { VK_RESULT_MAX_ENUM = 0x7FFFFFFF };
-#endif // VULKAN_H_
-extern "C" { extern GLFWAPI VkResult glfwCreateWindowSurface(VkInstance instance, GLFWwindow* window, const VkAllocationCallbacks* allocator, VkSurfaceKHR* surface); }
-static int ImGui_ImplGlfw_CreateVkSurface(ImGuiViewport* viewport, ImU64 vk_instance, const void* vk_allocator, ImU64* out_vk_surface)
-{
-    ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData;
-    IM_UNUSED(bd);
-    IM_ASSERT(bd->ClientApi == GlfwClientApi_Vulkan);
-    VkResult err = glfwCreateWindowSurface((VkInstance)vk_instance, vd->Window, (const VkAllocationCallbacks*)vk_allocator, (VkSurfaceKHR*)out_vk_surface);
-    return (int)err;
-}
-#endif // GLFW_HAS_VULKAN
-
-static void ImGui_ImplGlfw_InitMultiViewportSupport()
-{
-    // Register platform interface (will be coupled with a renderer interface)
-    ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Platform_CreateWindow = ImGui_ImplGlfw_CreateWindow;
-    platform_io.Platform_DestroyWindow = ImGui_ImplGlfw_DestroyWindow;
-    platform_io.Platform_ShowWindow = ImGui_ImplGlfw_ShowWindow;
-    platform_io.Platform_SetWindowPos = ImGui_ImplGlfw_SetWindowPos;
-    platform_io.Platform_GetWindowPos = ImGui_ImplGlfw_GetWindowPos;
-    platform_io.Platform_SetWindowSize = ImGui_ImplGlfw_SetWindowSize;
-    platform_io.Platform_GetWindowSize = ImGui_ImplGlfw_GetWindowSize;
-    platform_io.Platform_GetWindowFramebufferScale = ImGui_ImplGlfw_GetWindowFramebufferScale;
-    platform_io.Platform_SetWindowFocus = ImGui_ImplGlfw_SetWindowFocus;
-    platform_io.Platform_GetWindowFocus = ImGui_ImplGlfw_GetWindowFocus;
-    platform_io.Platform_GetWindowMinimized = ImGui_ImplGlfw_GetWindowMinimized;
-    platform_io.Platform_SetWindowTitle = ImGui_ImplGlfw_SetWindowTitle;
-    platform_io.Platform_RenderWindow = ImGui_ImplGlfw_RenderWindow;
-    platform_io.Platform_SwapBuffers = ImGui_ImplGlfw_SwapBuffers;
-#if GLFW_HAS_WINDOW_ALPHA
-    platform_io.Platform_SetWindowAlpha = ImGui_ImplGlfw_SetWindowAlpha;
-#endif
-#if GLFW_HAS_VULKAN
-    platform_io.Platform_CreateVkSurface = ImGui_ImplGlfw_CreateVkSurface;
-#endif
-
-    // Register main window handle (which is owned by the main application, not by us)
-    // This is mostly for simplicity and consistency, so that our code (e.g. mouse handling etc.) can use same logic for main and secondary viewports.
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    ImGui_ImplGlfw_ViewportData* vd = IM_NEW(ImGui_ImplGlfw_ViewportData)();
-    vd->Window = bd->Window;
-    vd->WindowOwned = false;
-    main_viewport->PlatformUserData = vd;
-    main_viewport->PlatformHandle = (void*)bd->Window;
-}
-
-static void ImGui_ImplGlfw_ShutdownMultiViewportSupport()
-{
-    ImGui::DestroyPlatformWindows();
-}
-
-//-----------------------------------------------------------------------------
-
-// WndProc hook (declared here because we will need access to ImGui_ImplGlfw_ViewportData)
-#ifdef _WIN32
-static ImGuiMouseSource GetMouseSourceFromMessageExtraInfo()
-{
-    LPARAM extra_info = ::GetMessageExtraInfo();
-    if ((extra_info & 0xFFFFFF80) == 0xFF515700)
-        return ImGuiMouseSource_Pen;
-    if ((extra_info & 0xFFFFFF80) == 0xFF515780)
-        return ImGuiMouseSource_TouchScreen;
-    return ImGuiMouseSource_Mouse;
-}
-static LRESULT CALLBACK ImGui_ImplGlfw_WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
-{
-    ImGui_ImplGlfw_Data* bd = (ImGui_ImplGlfw_Data*)::GetPropA(hWnd, "IMGUI_BACKEND_DATA");
-    ImGuiIO& io = ImGui::GetIO(bd->Context);
-
-    WNDPROC prev_wndproc = bd->PrevWndProc;
-    ImGuiViewport* viewport = (ImGuiViewport*)::GetPropA(hWnd, "IMGUI_VIEWPORT");
-    if (viewport != NULL)
-        if (ImGui_ImplGlfw_ViewportData* vd = (ImGui_ImplGlfw_ViewportData*)viewport->PlatformUserData)
-            prev_wndproc = vd->PrevWndProc;
-
-    switch (msg)
-    {
-        // GLFW doesn't allow to distinguish Mouse vs TouchScreen vs Pen.
-        // Add support for Win32 (based on imgui_impl_win32), because we rely on _TouchScreen info to trickle inputs differently.
-    case WM_MOUSEMOVE: case WM_NCMOUSEMOVE:
-    case WM_LBUTTONDOWN: case WM_LBUTTONDBLCLK: case WM_LBUTTONUP:
-    case WM_RBUTTONDOWN: case WM_RBUTTONDBLCLK: case WM_RBUTTONUP:
-    case WM_MBUTTONDOWN: case WM_MBUTTONDBLCLK: case WM_MBUTTONUP:
-    case WM_XBUTTONDOWN: case WM_XBUTTONDBLCLK: case WM_XBUTTONUP:
-        io.AddMouseSourceEvent(GetMouseSourceFromMessageExtraInfo());
-        break;
-
-        // We have submitted https://github.com/glfw/glfw/pull/1568 to allow GLFW to support "transparent inputs".
-        // In the meanwhile we implement custom per-platform workarounds here (FIXME-VIEWPORT: Implement same work-around for Linux/OSX!)
-#if !GLFW_HAS_MOUSE_PASSTHROUGH && GLFW_HAS_WINDOW_HOVERED
-    case WM_NCHITTEST:
-    {
-        // Let mouse pass-through the window. This will allow the backend to call io.AddMouseViewportEvent() properly (which is OPTIONAL).
-        // The ImGuiViewportFlags_NoInputs flag is set while dragging a viewport, as want to detect the window behind the one we are dragging.
-        // If you cannot easily access those viewport flags from your windowing/event code: you may manually synchronize its state e.g. in
-        // your main loop after calling UpdatePlatformWindows(). Iterate all viewports/platform windows and pass the flag to your windowing system.
-        if (viewport && (viewport->Flags & ImGuiViewportFlags_NoInputs))
-            return HTTRANSPARENT;
-        break;
-    }
-#endif
-    default: break;
-    }
-    return ::CallWindowProcW(prev_wndproc, hWnd, msg, wParam, lParam);
-}
-#endif // #ifdef _WIN32
-
 //-----------------------------------------------------------------------------
 
 #if defined(__clang__)

backends/imgui_impl_glfw.h

@@ -9,12 +9,10 @@
 //  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy GLFW_KEY_* values are obsolete since 1.87 and not supported since 1.91.5]
 //  [X] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors) with GLFW 3.1+. Resizing cursors requires GLFW 3.4+! Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
-//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 //  [X] Multiple Dear ImGui contexts support.
 // Missing features or Issues:
 //  [ ] Platform: Touch events are only correctly identified as Touch on Windows. This create issues with some interactions. GLFW doesn't provide a way to identify touch inputs from mouse inputs, we cannot call io.AddMouseSourceEvent() to identify the source. We provide a Windows-specific workaround.
 //  [ ] Platform: Missing ImGuiMouseCursor_Wait and ImGuiMouseCursor_Progress cursors.
-//  [ ] Platform: Multi-viewport: Missing ImGuiBackendFlags_HasParentViewport support. The viewport->ParentViewportID field is ignored, and therefore io.ConfigViewportsNoDefaultParent has no effect either.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_glut.cpp

@@ -13,7 +13,6 @@
 //  [ ] Platform: Missing mouse cursor shape/visibility support.
 //  [ ] Platform: Missing clipboard support (not supported by Glut).
 //  [ ] Platform: Missing gamepad support.
-//  [ ] Platform: Missing multi-viewport support (multiple windows).
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_glut.h

@@ -13,7 +13,6 @@
 //  [ ] Platform: Missing mouse cursor shape/visibility support.
 //  [ ] Platform: Missing clipboard support (not supported by Glut).
 //  [ ] Platform: Missing gamepad support.
-//  [ ] Platform: Missing multi-viewport support (multiple windows).
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_metal.h

@@ -5,7 +5,6 @@
 //  [X] Renderer: User texture binding. Use 'MTLTexture' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_metal.mm

@@ -5,7 +5,6 @@
 //  [X] Renderer: User texture binding. Use 'MTLTexture' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -17,7 +16,10 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Metal: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2026-04-28: Added support for standard draw callbacks (in platform_io): DrawCallback_SetSamplerLinear and DrawCallback_SetSamplerNearest. (#9378, #9381)
+//  2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState (others are not yet supported). (#9378)
+//  2026-04-14: Metal: use a dedicated bufferCacheLock to avoid crashing when bufferCache is replaced by a new object while being used for @synchronize(). (#9367)
+//  2026-04-03: Metal: avoid redundant vertex buffer bind in SetupRenderState. (#9343)
 //  2026-03-19: Fixed issue in ImGui_ImplMetal_RenderDrawData() if ImTextureID_Invalid is defined to be != 0, which became the default since 2026-03-12. (#9295, #9310)
 //  2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
 //  2025-06-11: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas. Removed ImGui_ImplMetal_CreateFontsTexture() and ImGui_ImplMetal_DestroyFontsTexture().
@@ -46,12 +48,6 @@
 #import <time.h>
 #import <Metal/Metal.h>
 
-// Forward Declarations
-static void ImGui_ImplMetal_InitMultiViewportSupport();
-static void ImGui_ImplMetal_ShutdownMultiViewportSupport();
-static void ImGui_ImplMetal_CreateDeviceObjectsForPlatformWindows();
-static void ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows();
-
 #pragma mark - Support classes
 
 // A wrapper around a MTLBuffer object that knows the last time it was reused
@@ -82,9 +78,12 @@ static void ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows();
 @interface MetalContext : NSObject
 @property (nonatomic, strong) id<MTLDevice>                 device;
 @property (nonatomic, strong) id<MTLDepthStencilState>      depthStencilState;
+@property (nonatomic, strong) id<MTLSamplerState>           samplerStateLinear;
+@property (nonatomic, strong) id<MTLSamplerState>           samplerStateNearest;
 @property (nonatomic, strong) FramebufferDescriptor*        framebufferDescriptor; // framebuffer descriptor for current frame; transient
 @property (nonatomic, strong) NSMutableDictionary*          renderPipelineStateCache; // pipeline cache; keyed on framebuffer descriptors
 @property (nonatomic, strong) NSMutableArray<MetalBuffer*>* bufferCache;
+@property (nonatomic, strong) NSObject*                     bufferCacheLock;
 @property (nonatomic, assign) double                        lastBufferCachePurge;
 - (MetalBuffer*)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device;
 - (id<MTLRenderPipelineState>)renderPipelineStateForFramebufferDescriptor:(FramebufferDescriptor*)descriptor device:(id<MTLDevice>)device;
@@ -93,6 +92,7 @@ static void ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows();
 struct ImGui_ImplMetal_Data
 {
     MetalContext*               SharedMetalContext;
+    id<MTLRenderCommandEncoder> RenderCommandEncoder;
 
     ImGui_ImplMetal_Data()      { memset((void*)this, 0, sizeof(*this)); }
 };
@@ -135,45 +135,6 @@ bool ImGui_ImplMetal_CreateDeviceObjects(MTL::Device* device)
 
 #pragma mark - Dear ImGui Metal Backend API
 
-bool ImGui_ImplMetal_Init(id<MTLDevice> device)
-{
-    ImGuiIO& io = ImGui::GetIO();
-    IMGUI_CHECKVERSION();
-    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
-
-    ImGui_ImplMetal_Data* bd = IM_NEW(ImGui_ImplMetal_Data)();
-    io.BackendRendererUserData = (void*)bd;
-    io.BackendRendererName = "imgui_impl_metal";
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
-
-    bd->SharedMetalContext = [[MetalContext alloc] init];
-    bd->SharedMetalContext.device = device;
-
-    ImGui_ImplMetal_InitMultiViewportSupport();
-
-    return true;
-}
-
-void ImGui_ImplMetal_Shutdown()
-{
-    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
-    IM_UNUSED(bd);
-    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
-    ImGuiIO& io = ImGui::GetIO();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-
-    ImGui_ImplMetal_ShutdownMultiViewportSupport();
-    ImGui_ImplMetal_DestroyDeviceObjects();
-    ImGui_ImplMetal_DestroyBackendData();
-
-    io.BackendRendererName = nullptr;
-    io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasViewports);
-    platform_io.ClearRendererHandlers();
-}
-
 void ImGui_ImplMetal_NewFrame(MTLRenderPassDescriptor* renderPassDescriptor)
 {
     ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
@@ -226,11 +187,16 @@ static void ImGui_ImplMetal_SetupRenderState(ImDrawData* draw_data, id<MTLComman
     [commandEncoder setVertexBytes:&ortho_projection length:sizeof(ortho_projection) atIndex:1];
 
     [commandEncoder setRenderPipelineState:renderPipelineState];
+    [commandEncoder setFragmentSamplerState:bd->SharedMetalContext.samplerStateLinear atIndex:0];
 
-    [commandEncoder setVertexBuffer:vertexBuffer.buffer offset:0 atIndex:0];
-    [commandEncoder setVertexBufferOffset:vertexBufferOffset atIndex:0];
+    [commandEncoder setVertexBuffer:vertexBuffer.buffer offset:vertexBufferOffset atIndex:0];
 }
 
+// Draw callbacks
+static void ImGui_ImplMetal_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)  {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+static void ImGui_ImplMetal_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)  { ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); [bd->RenderCommandEncoder setFragmentSamplerState:bd->SharedMetalContext.samplerStateLinear atIndex:0]; }
+static void ImGui_ImplMetal_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*) { ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); [bd->RenderCommandEncoder setFragmentSamplerState:bd->SharedMetalContext.samplerStateNearest atIndex:0]; }
+
 // Metal Render function.
 void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer> commandBuffer, id<MTLRenderCommandEncoder> commandEncoder)
 {
@@ -267,6 +233,7 @@ void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer>
     MetalBuffer* vertexBuffer = [ctx dequeueReusableBufferOfLength:vertexBufferLength device:commandBuffer.device];
     MetalBuffer* indexBuffer = [ctx dequeueReusableBufferOfLength:indexBufferLength device:commandBuffer.device];
 
+    bd->RenderCommandEncoder = commandEncoder;
     ImGui_ImplMetal_SetupRenderState(draw_data, commandBuffer, commandEncoder, renderPipelineState, vertexBuffer, 0);
 
     // Will project scissor/clipping rectangles into framebuffer space
@@ -287,8 +254,7 @@ void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer>
             if (pcmd->UserCallback)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplMetal_DrawCallback_ResetRenderState)
                     ImGui_ImplMetal_SetupRenderState(draw_data, commandBuffer, commandEncoder, renderPipelineState, vertexBuffer, vertexBufferOffset);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -302,8 +268,8 @@ void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer>
                 // Clamp to viewport as setScissorRect() won't accept values that are off bounds
                 if (clip_min.x < 0.0f) { clip_min.x = 0.0f; }
                 if (clip_min.y < 0.0f) { clip_min.y = 0.0f; }
-                if (clip_max.x > fb_width) { clip_max.x = (float)fb_width; }
-                if (clip_max.y > fb_height) { clip_max.y = (float)fb_height; }
+                if (clip_max.x > (float)fb_width) { clip_max.x = (float)fb_width; }
+                if (clip_max.y > (float)fb_height) { clip_max.y = (float)fb_height; }
                 if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
                 if (pcmd->ElemCount == 0) // drawIndexedPrimitives() validation doesn't accept this
@@ -340,14 +306,13 @@ void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer>
     MetalContext* sharedMetalContext = bd->SharedMetalContext;
     [commandBuffer addCompletedHandler:^(id<MTLCommandBuffer>)
     {
-        dispatch_async(dispatch_get_main_queue(), ^{
-            @synchronized(sharedMetalContext.bufferCache)
-            {
-                [sharedMetalContext.bufferCache addObject:vertexBuffer];
-                [sharedMetalContext.bufferCache addObject:indexBuffer];
-            }
-        });
+        @synchronized(sharedMetalContext.bufferCacheLock)
+        {
+            [sharedMetalContext.bufferCache addObject:vertexBuffer];
+            [sharedMetalContext.bufferCache addObject:indexBuffer];
+        }
     }];
+    bd->RenderCommandEncoder = nil;
 }
 
 static void ImGui_ImplMetal_DestroyTexture(ImTextureData* tex)
@@ -424,8 +389,17 @@ bool ImGui_ImplMetal_CreateDeviceObjects(id<MTLDevice> device)
     depthStencilDescriptor.depthWriteEnabled = NO;
     depthStencilDescriptor.depthCompareFunction = MTLCompareFunctionAlways;
     bd->SharedMetalContext.depthStencilState = [device newDepthStencilStateWithDescriptor:depthStencilDescriptor];
-    ImGui_ImplMetal_CreateDeviceObjectsForPlatformWindows();
+    MTLSamplerDescriptor* samplerDescriptor = [[MTLSamplerDescriptor alloc] init];
+    samplerDescriptor.minFilter = MTLSamplerMinMagFilterLinear;
+    samplerDescriptor.magFilter = MTLSamplerMinMagFilterLinear;
+    samplerDescriptor.mipFilter = MTLSamplerMipFilterLinear;
+    bd->SharedMetalContext.samplerStateLinear = [device newSamplerStateWithDescriptor:samplerDescriptor];
+    samplerDescriptor.minFilter = MTLSamplerMinMagFilterNearest;
+    samplerDescriptor.magFilter = MTLSamplerMinMagFilterNearest;
+    samplerDescriptor.mipFilter = MTLSamplerMipFilterNearest;
+    bd->SharedMetalContext.samplerStateNearest = [device newSamplerStateWithDescriptor:samplerDescriptor];
 #ifdef IMGUI_IMPL_METAL_CPP
+    [samplerDescriptor release];
     [depthStencilDescriptor release];
 #endif
 
@@ -441,152 +415,49 @@ void ImGui_ImplMetal_DestroyDeviceObjects()
         if (tex->RefCount == 1)
             ImGui_ImplMetal_DestroyTexture(tex);
 
-    ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows();
     [bd->SharedMetalContext.renderPipelineStateCache removeAllObjects];
+    bd->SharedMetalContext.samplerStateLinear = nil;
+    bd->SharedMetalContext.samplerStateNearest = nil;
 }
 
-#pragma mark - Multi-viewport support
-
-#import <QuartzCore/CAMetalLayer.h>
-
-#if TARGET_OS_OSX
-#import <Cocoa/Cocoa.h>
-#endif
-
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the back-end to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-struct ImGuiViewportDataMetal
+bool ImGui_ImplMetal_Init(id<MTLDevice> device)
 {
-    CAMetalLayer*               MetalLayer;
-    id<MTLCommandQueue>         CommandQueue;
-    MTLRenderPassDescriptor*    RenderPassDescriptor;
-    void*                       Handle = nullptr;
-    bool                        FirstFrame = true;
-};
+    ImGuiIO& io = ImGui::GetIO();
+    IMGUI_CHECKVERSION();
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
-static void ImGui_ImplMetal_CreateWindow(ImGuiViewport* viewport)
+    ImGui_ImplMetal_Data* bd = IM_NEW(ImGui_ImplMetal_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_metal";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
+
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplMetal_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplMetal_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplMetal_DrawCallback_SetSamplerNearest;
+
+    bd->SharedMetalContext = [[MetalContext alloc] init];
+    bd->SharedMetalContext.device = device;
+
+    return true;
+}
+
+void ImGui_ImplMetal_Shutdown()
 {
     ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
-    ImGuiViewportDataMetal* data = IM_NEW(ImGuiViewportDataMetal)();
-    viewport->RendererUserData = data;
-
-    // PlatformHandleRaw should always be a NSWindow*, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL_Window*).
-    // Some back-ends will leave PlatformHandleRaw == 0, in which case we assume PlatformHandle will contain the NSWindow*.
-    void* handle = viewport->PlatformHandleRaw ? viewport->PlatformHandleRaw : viewport->PlatformHandle;
-    IM_ASSERT(handle != nullptr);
-
-    id<MTLDevice> device = bd->SharedMetalContext.device;
-    CAMetalLayer* layer = [CAMetalLayer layer];
-    layer.device = device;
-    layer.framebufferOnly = YES;
-    layer.pixelFormat = bd->SharedMetalContext.framebufferDescriptor.colorPixelFormat;
-#if TARGET_OS_OSX
-    NSWindow* window = (__bridge NSWindow*)handle;
-    NSView* view = window.contentView;
-    view.layer = layer;
-    view.wantsLayer = YES;
-#endif
-    data->MetalLayer = layer;
-    data->CommandQueue = [device newCommandQueue];
-    data->RenderPassDescriptor = [[MTLRenderPassDescriptor alloc] init];
-    data->Handle = handle;
-}
-
-static void ImGui_ImplMetal_DestroyWindow(ImGuiViewport* viewport)
-{
-    // The main viewport (owned by the application) will always have RendererUserData == 0 since we didn't create the data for it.
-    if (ImGuiViewportDataMetal* data = (ImGuiViewportDataMetal*)viewport->RendererUserData)
-        IM_DELETE(data);
-    viewport->RendererUserData = nullptr;
-}
-
-inline static CGSize MakeScaledSize(CGSize size, CGFloat scale)
-{
-    return CGSizeMake(size.width * scale, size.height * scale);
-}
-
-static void ImGui_ImplMetal_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGuiViewportDataMetal* data = (ImGuiViewportDataMetal*)viewport->RendererUserData;
-    data->MetalLayer.drawableSize = MakeScaledSize(CGSizeMake(size.x, size.y), viewport->DpiScale);
-}
-
-static void ImGui_ImplMetal_RenderWindow(ImGuiViewport* viewport, void*)
-{
-    ImGuiViewportDataMetal* data = (ImGuiViewportDataMetal*)viewport->RendererUserData;
-
-#if TARGET_OS_OSX
-    void* handle = viewport->PlatformHandleRaw ? viewport->PlatformHandleRaw : viewport->PlatformHandle;
-    NSWindow* window = (__bridge NSWindow*)handle;
-
-    // Always render the first frame, regardless of occlusionState, to avoid an initial flicker
-    if ((window.occlusionState & NSWindowOcclusionStateVisible) == 0 && !data->FirstFrame)
-    {
-        // Do not render windows which are completely occluded. Calling -[CAMetalLayer nextDrawable] will hang for
-        // approximately 1 second if the Metal layer is completely occluded.
-        return;
-    }
-    data->FirstFrame = false;
-
-    float fb_scale = (float)window.backingScaleFactor;
-    if (data->MetalLayer.contentsScale != fb_scale)
-    {
-        data->MetalLayer.contentsScale = fb_scale;
-        data->MetalLayer.drawableSize = MakeScaledSize(window.frame.size, fb_scale);
-    }
-#endif
-
-    id <CAMetalDrawable> drawable = [data->MetalLayer nextDrawable];
-    if (drawable == nil)
-        return;
-
-    MTLRenderPassDescriptor* renderPassDescriptor = data->RenderPassDescriptor;
-    renderPassDescriptor.colorAttachments[0].texture = drawable.texture;
-    renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(0, 0, 0, 0);
-    if ((viewport->Flags & ImGuiViewportFlags_NoRendererClear) == 0)
-        renderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
-
-    id <MTLCommandBuffer> commandBuffer = [data->CommandQueue commandBuffer];
-    id <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
-    ImGui_ImplMetal_RenderDrawData(viewport->DrawData, commandBuffer, renderEncoder);
-    [renderEncoder endEncoding];
-
-    [commandBuffer presentDrawable:drawable];
-    [commandBuffer commit];
-}
-
-static void ImGui_ImplMetal_InitMultiViewportSupport()
-{
+    IM_UNUSED(bd);
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_CreateWindow = ImGui_ImplMetal_CreateWindow;
-    platform_io.Renderer_DestroyWindow = ImGui_ImplMetal_DestroyWindow;
-    platform_io.Renderer_SetWindowSize = ImGui_ImplMetal_SetWindowSize;
-    platform_io.Renderer_RenderWindow = ImGui_ImplMetal_RenderWindow;
-}
 
-static void ImGui_ImplMetal_ShutdownMultiViewportSupport()
-{
-    ImGui::DestroyPlatformWindows();
-}
+    ImGui_ImplMetal_DestroyDeviceObjects();
+    ImGui_ImplMetal_DestroyBackendData();
 
-static void ImGui_ImplMetal_CreateDeviceObjectsForPlatformWindows()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    for (int i = 1; i < platform_io.Viewports.Size; i++)
-        if (!platform_io.Viewports[i]->RendererUserData)
-            ImGui_ImplMetal_CreateWindow(platform_io.Viewports[i]);
-}
-
-static void ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    for (int i = 1; i < platform_io.Viewports.Size; i++)
-        if (platform_io.Viewports[i]->RendererUserData)
-            ImGui_ImplMetal_DestroyWindow(platform_io.Viewports[i]);
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
+    platform_io.ClearRendererHandlers();
 }
 
 #pragma mark - MetalBuffer implementation
@@ -672,6 +543,7 @@ static void ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows()
     {
         self.renderPipelineStateCache = [NSMutableDictionary dictionary];
         self.bufferCache = [NSMutableArray array];
+        self.bufferCacheLock = [[NSObject alloc] init];
         _lastBufferCachePurge = GetMachAbsoluteTimeInSeconds();
     }
     return self;
@@ -679,9 +551,9 @@ static void ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows()
 
 - (MetalBuffer*)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device
 {
-    uint64_t now = GetMachAbsoluteTimeInSeconds();
+    double now = GetMachAbsoluteTimeInSeconds();
 
-    @synchronized(self.bufferCache)
+    @synchronized(self.bufferCacheLock)
     {
         // Purge old buffers that haven't been useful for a while
         if (now - self.lastBufferCachePurge > 1.0)
@@ -748,9 +620,9 @@ static void ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows()
     "}\n"
     "\n"
     "fragment half4 fragment_main(VertexOut in [[stage_in]],\n"
-    "                             texture2d<half, access::sample> texture [[texture(0)]]) {\n"
-    "    constexpr sampler linearSampler(coord::normalized, min_filter::linear, mag_filter::linear, mip_filter::linear);\n"
-    "    half4 texColor = texture.sample(linearSampler, in.texCoords);\n"
+    "                             texture2d<half, access::sample> texture [[texture(0)]],\n"
+    "                             sampler textureSampler [[sampler(0)]]) {\n"
+    "    half4 texColor = texture.sample(textureSampler, in.texCoords);\n"
     "    return half4(in.color) * texColor;\n"
     "}\n";
 

backends/imgui_impl_opengl2.cpp

@@ -4,9 +4,9 @@
 // Implemented features:
 //  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 // Missing features or Issues:
 //  [ ] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
+//  [ ] Renderer: Use of DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest is emulated by poking to glTexParameter(), as legacy OpenGL doesn't have glBindSampler().
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -26,7 +26,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2026-04-23: OpenGL: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. (#9378)
 //  2026-03-12: OpenGL: Fixed invalid assert in ImGui_ImplOpenGL3_UpdateTexture() if ImTextureID_Invalid is defined to be != 0, which became the default since 2026-03-12. (#9295)
 //  2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
 //  2025-07-15: OpenGL: Set GL_UNPACK_ALIGNMENT to 1 before updating textures. (#8802)
@@ -88,6 +88,9 @@
 // OpenGL data
 struct ImGui_ImplOpenGL2_Data
 {
+    bool        UseTexParameterToSetSampler;
+    GLuint      NextSampler;
+
     ImGui_ImplOpenGL2_Data() { memset((void*)this, 0, sizeof(*this)); }
 };
 
@@ -98,46 +101,7 @@ static ImGui_ImplOpenGL2_Data* ImGui_ImplOpenGL2_GetBackendData()
     return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL2_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
-// Forward Declarations
-static void ImGui_ImplOpenGL2_InitMultiViewportSupport();
-static void ImGui_ImplOpenGL2_ShutdownMultiViewportSupport();
-
 // Functions
-bool    ImGui_ImplOpenGL2_Init()
-{
-    ImGuiIO& io = ImGui::GetIO();
-    IMGUI_CHECKVERSION();
-    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
-
-    // Setup backend capabilities flags
-    ImGui_ImplOpenGL2_Data* bd = IM_NEW(ImGui_ImplOpenGL2_Data)();
-    io.BackendRendererUserData = (void*)bd;
-    io.BackendRendererName = "imgui_impl_opengl2";
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;       // We can honor ImGuiPlatformIO::Textures[] requests during render.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;      // We can create multi-viewports on the Renderer side (optional)
-
-    ImGui_ImplOpenGL2_InitMultiViewportSupport();
-
-    return true;
-}
-
-void    ImGui_ImplOpenGL2_Shutdown()
-{
-    ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
-    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
-    ImGuiIO& io = ImGui::GetIO();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-
-    ImGui_ImplOpenGL2_ShutdownMultiViewportSupport();
-    ImGui_ImplOpenGL2_DestroyDeviceObjects();
-
-    io.BackendRendererName = nullptr;
-    io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasViewports);
-    platform_io.ClearRendererHandlers();
-    IM_DELETE(bd);
-}
-
 void    ImGui_ImplOpenGL2_NewFrame()
 {
     ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
@@ -148,6 +112,7 @@ void    ImGui_ImplOpenGL2_NewFrame()
 static void ImGui_ImplOpenGL2_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height)
 {
     // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers, polygon fill.
+    ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     //glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA); // In order to composite our output buffer we need to preserve alpha
@@ -165,6 +130,7 @@ static void ImGui_ImplOpenGL2_SetupRenderState(ImDrawData* draw_data, int fb_wid
     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
     glShadeModel(GL_SMOOTH);
     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+    bd->NextSampler = GL_LINEAR;
 
     // If you are using this code with non-legacy OpenGL header/contexts (which you should not, prefer using imgui_impl_opengl3.cpp!!),
     // you may need to backup/reset/restore other state, e.g. for current shader using the commented lines below.
@@ -189,12 +155,18 @@ static void ImGui_ImplOpenGL2_SetupRenderState(ImDrawData* draw_data, int fb_wid
     glLoadIdentity();
 }
 
+// Draw callbacks
+static void ImGui_ImplOpenGL2_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)    {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+static void ImGui_ImplOpenGL2_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)    { ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData(); bd->UseTexParameterToSetSampler = true; bd->NextSampler = GL_LINEAR; }
+static void ImGui_ImplOpenGL2_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)   { ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData(); bd->UseTexParameterToSetSampler = true; bd->NextSampler = GL_NEAREST; }
+
 // OpenGL2 Render function.
 // Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly.
 // This is in order to be able to run within an OpenGL engine that doesn't do so.
 void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
 {
     // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
+    ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
     int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
     int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);
     if (fb_width == 0 || fb_height == 0)
@@ -238,8 +210,7 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
             if (pcmd->UserCallback)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplOpenGL2_DrawCallback_ResetRenderState)
                     ImGui_ImplOpenGL2_SetupRenderState(draw_data, fb_width, fb_height);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -256,7 +227,17 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
                 glScissor((int)clip_min.x, (int)((float)fb_height - clip_max.y), (int)(clip_max.x - clip_min.x), (int)(clip_max.y - clip_min.y));
 
                 // Bind texture, Draw
-                glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->GetTexID());
+                GLuint pcmd_texture = (GLuint)(intptr_t)pcmd->GetTexID();
+                glBindTexture(GL_TEXTURE_2D, pcmd_texture);
+
+                // Emulate sampler change (even though it is technically part of texture data)
+                // As a sort of hack/workaround, we only start writing using glTextParameter() if sampler is ever changed explicitly.
+                if (bd->UseTexParameterToSetSampler)
+                {
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, bd->NextSampler);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, bd->NextSampler);
+                }
+
                 glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, idx_buffer + pcmd->IdxOffset);
             }
         }
@@ -354,33 +335,40 @@ void    ImGui_ImplOpenGL2_DestroyDeviceObjects()
         }
 }
 
-
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-static void ImGui_ImplOpenGL2_RenderWindow(ImGuiViewport* viewport, void*)
+bool    ImGui_ImplOpenGL2_Init()
 {
-    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
-    {
-        ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
-        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
-        glClear(GL_COLOR_BUFFER_BIT);
-    }
-    ImGui_ImplOpenGL2_RenderDrawData(viewport->DrawData);
-}
+    ImGuiIO& io = ImGui::GetIO();
+    IMGUI_CHECKVERSION();
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
+
+    // Setup backend capabilities flags
+    ImGui_ImplOpenGL2_Data* bd = IM_NEW(ImGui_ImplOpenGL2_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_opengl2";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;       // We can honor ImGuiPlatformIO::Textures[] requests during render.
 
-static void ImGui_ImplOpenGL2_InitMultiViewportSupport()
-{
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_RenderWindow = ImGui_ImplOpenGL2_RenderWindow;
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplOpenGL2_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplOpenGL2_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplOpenGL2_DrawCallback_SetSamplerNearest;
+
+    return true;
 }
 
-static void ImGui_ImplOpenGL2_ShutdownMultiViewportSupport()
+void    ImGui_ImplOpenGL2_Shutdown()
 {
-    ImGui::DestroyPlatformWindows();
+    ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+
+    ImGui_ImplOpenGL2_DestroyDeviceObjects();
+
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasTextures);
+    platform_io.ClearRendererHandlers();
+    IM_DELETE(bd);
 }
 
 //-----------------------------------------------------------------------------

backends/imgui_impl_opengl2.h

@@ -4,9 +4,9 @@
 // Implemented features:
 //  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 // Missing features or Issues:
 //  [ ] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
+//  [ ] Renderer: Use of DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest is emulated by poking to glTexParameter(), as legacy OpenGL doesn't have glBindSampler().
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_opengl3.cpp

@@ -7,7 +7,6 @@
 //  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
 //  [x] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset) [Desktop OpenGL only!]
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // About WebGL/ES:
 // - You need to '#define IMGUI_IMPL_OPENGL_ES2' or '#define IMGUI_IMPL_OPENGL_ES3' to use WebGL or OpenGL ES.
@@ -24,7 +23,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2026-04-23: OpenGL: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. (#9378)
 //  2026-03-12: OpenGL: Fixed invalid assert in ImGui_ImplOpenGL3_UpdateTexture() if ImTextureID_Invalid is defined to be != 0, which became the default since 2026-03-12. (#9295)
 //  2025-12-11: OpenGL: Fixed embedded loader multiple init/shutdown cycles broken on some platforms. (#8792, #9112)
 //  2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
@@ -254,6 +253,12 @@ struct ImGui_ImplOpenGL3_Data
     bool            HasBindSampler;
     bool            HasClipOrigin;
     bool            UseBufferSubData;
+    bool            UseTexParameterToSetSampler;
+    GLuint          NextSampler;            // Used if !HasBindSampler && UseTexParameterToSetSampler.
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    GLuint          TexSamplers[2];         // Used if HasBindSimpler. (0=linear, 1=nearest)
+#endif
+
     ImVector<char>  TempBuffer;
 
     ImGui_ImplOpenGL3_Data() { memset((void*)this, 0, sizeof(*this)); }
@@ -266,10 +271,6 @@ static ImGui_ImplOpenGL3_Data* ImGui_ImplOpenGL3_GetBackendData()
     return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL3_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
-// Forward Declarations
-static void ImGui_ImplOpenGL3_InitMultiViewportSupport();
-static void ImGui_ImplOpenGL3_ShutdownMultiViewportSupport();
-
 // OpenGL vertex attribute state (for ES 1.0 and ES 2.0 only)
 #ifndef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
 struct ImGui_ImplOpenGL3_VtxAttribState
@@ -318,143 +319,6 @@ static void ImGui_ImplOpenGL3_ShutdownLoader()
 }
 
 // Functions
-bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
-{
-    ImGuiIO& io = ImGui::GetIO();
-    IMGUI_CHECKVERSION();
-    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
-
-    // Initialize loader
-    if (!ImGui_ImplOpenGL3_InitLoader())
-        return false;
-
-    // Setup backend capabilities flags
-    ImGui_ImplOpenGL3_Data* bd = IM_NEW(ImGui_ImplOpenGL3_Data)();
-    io.BackendRendererUserData = (void*)bd;
-    io.BackendRendererName = "imgui_impl_opengl3";
-
-    // Query for GL version (e.g. 320 for GL 3.2)
-    const char* gl_version_str = (const char*)glGetString(GL_VERSION);
-#if defined(IMGUI_IMPL_OPENGL_ES2)
-    // GLES 2
-    bd->GlVersion = 200;
-    bd->GlProfileIsES2 = true;
-    IM_UNUSED(gl_version_str);
-#else
-    // Desktop or GLES 3
-    GLint major = 0;
-    GLint minor = 0;
-    glGetIntegerv(GL_MAJOR_VERSION, &major);
-    glGetIntegerv(GL_MINOR_VERSION, &minor);
-    if (major == 0 && minor == 0)
-        sscanf(gl_version_str, "%d.%d", &major, &minor); // Query GL_VERSION in desktop GL 2.x, the string will start with "<major>.<minor>"
-    bd->GlVersion = (GLuint)(major * 100 + minor * 10);
-    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &bd->MaxTextureSize);
-
-#if defined(IMGUI_IMPL_OPENGL_ES3)
-    bd->GlProfileIsES3 = true;
-#else
-    if (strncmp(gl_version_str, "OpenGL ES 3", 11) == 0)
-        bd->GlProfileIsES3 = true;
-#endif
-
-#if defined(GL_CONTEXT_PROFILE_MASK)
-    if (!bd->GlProfileIsES3 && bd->GlVersion >= 320)
-        glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &bd->GlProfileMask);
-    bd->GlProfileIsCompat = (bd->GlProfileMask & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT) != 0;
-#endif
-
-    bd->UseBufferSubData = false;
-    /*
-    // Query vendor to enable glBufferSubData kludge
-#ifdef _WIN32
-    if (const char* vendor = (const char*)glGetString(GL_VENDOR))
-        if (strncmp(vendor, "Intel", 5) == 0)
-            bd->UseBufferSubData = true;
-#endif
-    */
-#endif
-
-#ifdef IMGUI_IMPL_OPENGL_DEBUG
-    printf("GlVersion = %d, \"%s\"\nGlProfileIsCompat = %d\nGlProfileMask = 0x%X\nGlProfileIsES2/IsEs3 = %d/%d\nGL_VENDOR = '%s'\nGL_RENDERER = '%s'\n", bd->GlVersion, gl_version_str, bd->GlProfileIsCompat, bd->GlProfileMask, bd->GlProfileIsES2, bd->GlProfileIsES3, (const char*)glGetString(GL_VENDOR), (const char*)glGetString(GL_RENDERER)); // [DEBUG]
-#endif
-
-#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
-    if (bd->GlVersion >= 320)
-        io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
-#endif
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;       // We can honor ImGuiPlatformIO::Textures[] requests during render.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;      // We can create multi-viewports on the Renderer side (optional)
-
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_TextureMaxWidth = platform_io.Renderer_TextureMaxHeight = (int)bd->MaxTextureSize;
-
-    // Store GLSL version string so we can refer to it later in case we recreate shaders.
-    // Note: GLSL version is NOT the same as GL version. Leave this to nullptr if unsure.
-    if (glsl_version == nullptr)
-    {
-#if defined(IMGUI_IMPL_OPENGL_ES2)
-        glsl_version = "#version 100";
-#elif defined(IMGUI_IMPL_OPENGL_ES3)
-        glsl_version = "#version 300 es";
-#elif defined(__APPLE__)
-        glsl_version = "#version 150";
-#else
-        glsl_version = "#version 130";
-#endif
-    }
-    IM_ASSERT((int)strlen(glsl_version) + 2 < IM_COUNTOF(bd->GlslVersionString));
-    strcpy(bd->GlslVersionString, glsl_version);
-    strcat(bd->GlslVersionString, "\n");
-
-    // Make an arbitrary GL call (we don't actually need the result)
-    // IF YOU GET A CRASH HERE: it probably means the OpenGL function loader didn't do its job. Let us know!
-    GLint current_texture;
-    glGetIntegerv(GL_TEXTURE_BINDING_2D, &current_texture);
-
-    // Detect extensions we support
-#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_POLYGON_MODE
-    bd->HasPolygonMode = (!bd->GlProfileIsES2 && !bd->GlProfileIsES3);
-#endif
-#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
-    bd->HasBindSampler = (bd->GlVersion >= 330 || bd->GlProfileIsES3);
-#endif
-    bd->HasClipOrigin = (bd->GlVersion >= 450);
-#ifdef IMGUI_IMPL_OPENGL_HAS_EXTENSIONS
-    GLint num_extensions = 0;
-    glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
-    for (GLint i = 0; i < num_extensions; i++)
-    {
-        const char* extension = (const char*)glGetStringi(GL_EXTENSIONS, i);
-        if (extension != nullptr && strcmp(extension, "GL_ARB_clip_control") == 0)
-            bd->HasClipOrigin = true;
-    }
-#endif
-
-    ImGui_ImplOpenGL3_InitMultiViewportSupport();
-
-    return true;
-}
-
-void    ImGui_ImplOpenGL3_Shutdown()
-{
-    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
-    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
-    ImGuiIO& io = ImGui::GetIO();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-
-    ImGui_ImplOpenGL3_ShutdownMultiViewportSupport();
-    ImGui_ImplOpenGL3_DestroyDeviceObjects();
-
-    io.BackendRendererName = nullptr;
-    io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasViewports);
-    platform_io.ClearRendererHandlers();
-    IM_DELETE(bd);
-
-    ImGui_ImplOpenGL3_ShutdownLoader();
-}
-
 void    ImGui_ImplOpenGL3_NewFrame()
 {
     ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
@@ -521,7 +385,7 @@ static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_wid
 
 #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
     if (bd->HasBindSampler)
-        glBindSampler(0, 0); // We use combined texture/sampler state. Applications using GL 3.3 and GL ES 3.0 may set that otherwise.
+        glBindSampler(0, bd->TexSamplers[0]); // We use combined texture/sampler state. Applications using GL 3.3 and GL ES 3.0 may set that otherwise.
 #endif
 
     (void)vertex_array_object;
@@ -540,6 +404,16 @@ static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_wid
     GL_CALL(glVertexAttribPointer(bd->AttribLocationVtxColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)offsetof(ImDrawVert, col)));
 }
 
+// Draw callbacks
+static void ImGui_ImplOpenGL3_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)    {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+static void ImGui_ImplOpenGL3_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)    { ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); if (bd->HasBindSampler) { glBindSampler(0, bd->TexSamplers[0]); } else { bd->UseTexParameterToSetSampler = true; bd->NextSampler = GL_LINEAR; } }
+static void ImGui_ImplOpenGL3_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)   { ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); if (bd->HasBindSampler) { glBindSampler(0, bd->TexSamplers[1]); } else { bd->UseTexParameterToSetSampler = true; bd->NextSampler = GL_NEAREST; } }
+#else
+static void ImGui_ImplOpenGL3_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)    { ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); bd->UseTexParameterToSetSampler = true; bd->NextSampler = GL_LINEAR; }
+static void ImGui_ImplOpenGL3_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)   { ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); bd->UseTexParameterToSetSampler = true; bd->NextSampler = GL_NEAREST; }
+#endif
+
 // OpenGL3 Render function.
 // Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly.
 // This is in order to be able to run within an OpenGL engine that doesn't do so.
@@ -654,8 +528,7 @@ void    ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
             if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplOpenGL3_DrawCallback_ResetRenderState)
                     ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -673,6 +546,15 @@ void    ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
 
                 // Bind texture, Draw
                 GL_CALL(glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->GetTexID()));
+
+                // Emulate sampler change (even though it is technically part of texture data)
+                // As a sort of hack/workaround, we only start writing using glTextParameter() if sampler is ever changed explicitly.
+                if (!bd->HasBindSampler && bd->UseTexParameterToSetSampler)
+                {
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, bd->NextSampler);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, bd->NextSampler);
+                }
+
 #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
                 if (bd->GlVersion >= 320)
                     GL_CALL(glDrawElementsBaseVertex(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx)), (GLint)pcmd->VtxOffset));
@@ -1038,6 +920,20 @@ bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
     glGenBuffers(1, &bd->VboHandle);
     glGenBuffers(1, &bd->ElementsHandle);
 
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    if (bd->HasBindSampler)
+    {
+        glGenSamplers(2, &bd->TexSamplers[0]);
+        for (int sampler_n = 0; sampler_n < 2; sampler_n++)
+        {
+            GL_CALL(glSamplerParameteri(bd->TexSamplers[sampler_n], GL_TEXTURE_MIN_FILTER, (sampler_n == 0) ? GL_LINEAR : GL_NEAREST));
+            GL_CALL(glSamplerParameteri(bd->TexSamplers[sampler_n], GL_TEXTURE_MAG_FILTER, (sampler_n == 0) ? GL_LINEAR : GL_NEAREST));
+            GL_CALL(glSamplerParameteri(bd->TexSamplers[sampler_n], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
+            GL_CALL(glSamplerParameteri(bd->TexSamplers[sampler_n], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
+        }
+    }
+#endif
+
     // Restore modified GL state
     glBindTexture(GL_TEXTURE_2D, last_texture);
     glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
@@ -1055,6 +951,9 @@ void    ImGui_ImplOpenGL3_DestroyDeviceObjects()
 {
     ImGui_ImplOpenGL3_InitLoader();
     ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    if (bd->TexSamplers[0]) { glDeleteSamplers(2, &bd->TexSamplers[0]); bd->TexSamplers[0] = bd->TexSamplers[1] = 0; }
+#endif
     if (bd->VboHandle)      { glDeleteBuffers(1, &bd->VboHandle); bd->VboHandle = 0; }
     if (bd->ElementsHandle) { glDeleteBuffers(1, &bd->ElementsHandle); bd->ElementsHandle = 0; }
     if (bd->ShaderHandle)   { glDeleteProgram(bd->ShaderHandle); bd->ShaderHandle = 0; }
@@ -1065,32 +964,140 @@ void    ImGui_ImplOpenGL3_DestroyDeviceObjects()
             ImGui_ImplOpenGL3_DestroyTexture(tex);
 }
 
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-static void ImGui_ImplOpenGL3_RenderWindow(ImGuiViewport* viewport, void*)
+bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
 {
-    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
-    {
-        ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
-        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
-        glClear(GL_COLOR_BUFFER_BIT);
-    }
-    ImGui_ImplOpenGL3_RenderDrawData(viewport->DrawData);
-}
+    ImGuiIO& io = ImGui::GetIO();
+    IMGUI_CHECKVERSION();
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
+
+    // Initialize loader
+    if (!ImGui_ImplOpenGL3_InitLoader())
+        return false;
+
+    // Setup backend capabilities flags
+    ImGui_ImplOpenGL3_Data* bd = IM_NEW(ImGui_ImplOpenGL3_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_opengl3";
+
+    // Query for GL version (e.g. 320 for GL 3.2)
+    const char* gl_version_str = (const char*)glGetString(GL_VERSION);
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+    // GLES 2
+    bd->GlVersion = 200;
+    bd->GlProfileIsES2 = true;
+    IM_UNUSED(gl_version_str);
+#else
+    // Desktop or GLES 3
+    GLint major = 0;
+    GLint minor = 0;
+    glGetIntegerv(GL_MAJOR_VERSION, &major);
+    glGetIntegerv(GL_MINOR_VERSION, &minor);
+    if (major == 0 && minor == 0)
+        sscanf(gl_version_str, "%d.%d", &major, &minor); // Query GL_VERSION in desktop GL 2.x, the string will start with "<major>.<minor>"
+    bd->GlVersion = (GLuint)(major * 100 + minor * 10);
+    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &bd->MaxTextureSize);
+
+#if defined(IMGUI_IMPL_OPENGL_ES3)
+    bd->GlProfileIsES3 = true;
+#else
+    if (strncmp(gl_version_str, "OpenGL ES 3", 11) == 0)
+        bd->GlProfileIsES3 = true;
+#endif
+
+#if defined(GL_CONTEXT_PROFILE_MASK)
+    if (!bd->GlProfileIsES3 && bd->GlVersion >= 320)
+        glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &bd->GlProfileMask);
+    bd->GlProfileIsCompat = (bd->GlProfileMask & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT) != 0;
+#endif
+
+    bd->UseBufferSubData = false;
+    /*
+    // Query vendor to enable glBufferSubData kludge
+#ifdef _WIN32
+    if (const char* vendor = (const char*)glGetString(GL_VENDOR))
+        if (strncmp(vendor, "Intel", 5) == 0)
+            bd->UseBufferSubData = true;
+#endif
+    */
+#endif
+
+#ifdef IMGUI_IMPL_OPENGL_DEBUG
+    printf("GlVersion = %d, \"%s\"\nGlProfileIsCompat = %d\nGlProfileMask = 0x%X\nGlProfileIsES2/IsEs3 = %d/%d\nGL_VENDOR = '%s'\nGL_RENDERER = '%s'\n", bd->GlVersion, gl_version_str, bd->GlProfileIsCompat, bd->GlProfileMask, bd->GlProfileIsES2, bd->GlProfileIsES3, (const char*)glGetString(GL_VENDOR), (const char*)glGetString(GL_RENDERER)); // [DEBUG]
+#endif
+
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
+    if (bd->GlVersion >= 320)
+        io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+#endif
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;       // We can honor ImGuiPlatformIO::Textures[] requests during render.
 
-static void ImGui_ImplOpenGL3_InitMultiViewportSupport()
-{
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_RenderWindow = ImGui_ImplOpenGL3_RenderWindow;
+    platform_io.Renderer_TextureMaxWidth = platform_io.Renderer_TextureMaxHeight = (int)bd->MaxTextureSize;
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplOpenGL3_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplOpenGL3_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplOpenGL3_DrawCallback_SetSamplerNearest;
+
+    // Store GLSL version string so we can refer to it later in case we recreate shaders.
+    // Note: GLSL version is NOT the same as GL version. Leave this to nullptr if unsure.
+    if (glsl_version == nullptr)
+    {
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+        glsl_version = "#version 100";
+#elif defined(IMGUI_IMPL_OPENGL_ES3)
+        glsl_version = "#version 300 es";
+#elif defined(__APPLE__)
+        glsl_version = "#version 150";
+#else
+        glsl_version = "#version 130";
+#endif
+    }
+    IM_ASSERT((int)strlen(glsl_version) + 2 < IM_COUNTOF(bd->GlslVersionString));
+    strcpy(bd->GlslVersionString, glsl_version);
+    strcat(bd->GlslVersionString, "\n");
+
+    // Make an arbitrary GL call (we don't actually need the result)
+    // IF YOU GET A CRASH HERE: it probably means the OpenGL function loader didn't do its job. Let us know!
+    GLint current_texture;
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &current_texture);
+
+    // Detect extensions we support
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_POLYGON_MODE
+    bd->HasPolygonMode = (!bd->GlProfileIsES2 && !bd->GlProfileIsES3);
+#endif
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    bd->HasBindSampler = (bd->GlVersion >= 330 || bd->GlProfileIsES3);
+#endif
+    bd->HasClipOrigin = (bd->GlVersion >= 450);
+#ifdef IMGUI_IMPL_OPENGL_HAS_EXTENSIONS
+    GLint num_extensions = 0;
+    glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
+    for (GLint i = 0; i < num_extensions; i++)
+    {
+        const char* extension = (const char*)glGetStringi(GL_EXTENSIONS, i);
+        if (extension != nullptr && strcmp(extension, "GL_ARB_clip_control") == 0)
+            bd->HasClipOrigin = true;
+    }
+#endif
+
+    return true;
 }
 
-static void ImGui_ImplOpenGL3_ShutdownMultiViewportSupport()
+void    ImGui_ImplOpenGL3_Shutdown()
 {
-    ImGui::DestroyPlatformWindows();
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+
+    ImGui_ImplOpenGL3_DestroyDeviceObjects();
+
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
+    platform_io.ClearRendererHandlers();
+    IM_DELETE(bd);
+
+    ImGui_ImplOpenGL3_ShutdownLoader();
 }
 
 //-----------------------------------------------------------------------------

backends/imgui_impl_opengl3.h

@@ -7,7 +7,6 @@
 //  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
 //  [x] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset) [Desktop OpenGL only!]
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // About WebGL/ES:
 // - You need to '#define IMGUI_IMPL_OPENGL_ES2' or '#define IMGUI_IMPL_OPENGL_ES3' to use WebGL or OpenGL ES.

backends/imgui_impl_osx.h

@@ -10,10 +10,6 @@
 //  [X] Platform: Gamepad support.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
 //  [X] Platform: IME support.
-//  [x] Platform: Multi-viewport / platform windows.
-// Missing features or Issues:
-//  [ ] Platform: Multi-viewport: Window size not correctly reported when enabling io.ConfigViewportsNoDecoration
-//  [ ] Platform: Multi-viewport: Missing ImGuiBackendFlags_HasParentViewport support. The viewport->ParentViewportID field is ignored, and therefore io.ConfigViewportsNoDefaultParent has no effect either.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_osx.mm

@@ -10,10 +10,6 @@
 //  [X] Platform: Gamepad support.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
 //  [X] Platform: IME support.
-//  [x] Platform: Multi-viewport / platform windows.
-// Missing features or Issues:
-//  [ ] Platform: Multi-viewport: Window size not correctly reported when enabling io.ConfigViewportsNoDecoration
-//  [ ] Platform: Multi-viewport: Missing ImGuiBackendFlags_HasParentViewport support. The viewport->ParentViewportID field is ignored, and therefore io.ConfigViewportsNoDefaultParent has no effect either.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -33,12 +29,9 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2025-09-18: Call platform_io.ClearPlatformHandlers() on shutdown.
-//  2025-07-08: [Docking] Fixed multi-viewport handling broken on 2025-06-02. (#8644, #8777)
 //  2025-06-27: Added ImGuiMouseCursor_Wait and ImGuiMouseCursor_Progress mouse cursor support.
 //  2025-06-12: ImGui_ImplOSX_HandleEvent() only process event for window containing our view. (#8644)
-//  2025-05-15: [Docking] Add Platform_GetWindowFramebufferScale() handler, to allow varying Retina display density on multiple monitors.
 //  2025-03-21: Fill gamepad inputs and set ImGuiBackendFlags_HasGamepad regardless of ImGuiConfigFlags_NavEnableGamepad being set.
 //  2025-01-20: Removed notification observer when shutting down. (#8331)
 //  2024-08-22: moved some OS/backend related function pointers from ImGuiIO to ImGuiPlatformIO:
@@ -108,9 +101,6 @@ static void                     ImGui_ImplOSX_DestroyBackendData()  { IM_DELETE(
 static inline CFTimeInterval    GetMachAbsoluteTimeInSeconds()      { return (CFTimeInterval)(double)(clock_gettime_nsec_np(CLOCK_UPTIME_RAW) / 1e9); }
 
 // Forward Declarations
-static void ImGui_ImplOSX_InitMultiViewportSupport();
-static void ImGui_ImplOSX_ShutdownMultiViewportSupport();
-static void ImGui_ImplOSX_UpdateMonitors();
 static void ImGui_ImplOSX_AddTrackingArea(NSView* _Nonnull view);
 static bool ImGui_ImplOSX_HandleEvent(NSEvent* event, NSView* view);
 
@@ -158,20 +148,6 @@ static bool ImGui_ImplOSX_HandleEvent(NSEvent* event, NSView* view);
     NSWindow* window = view.window;
     if (!window)
         return;
-
-    ImGuiIO& io = ImGui::GetIO();
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        NSRect frame = window.frame;
-        NSRect contentRect = window.contentLayoutRect;
-        if (window.styleMask & NSWindowStyleMaskFullSizeContentView) // No title bar windows should be considered.
-            contentRect = frame;
-
-        NSRect firstScreenFrame = NSScreen.screens[0].frame;
-        _imeRect = NSMakeRect(_posX, _posY, 0, 0);
-        _imeRect.origin.y = firstScreenFrame.size.height - _imeRect.size.height - _imeRect.origin.y; // Opposite of ConvertNSRect()
-    }
-    else
     {
         NSRect contentRect = [window contentRectForFrameRect:window.frame];
         NSRect rect = NSMakeRect(_posX, contentRect.size.height - _posY, 0, 0);
@@ -271,7 +247,6 @@ static bool ImGui_ImplOSX_HandleEvent(NSEvent* event, NSView* view);
 
 - (void)onApplicationBecomeActive:(NSNotification*)aNotification;
 - (void)onApplicationBecomeInactive:(NSNotification*)aNotification;
-- (void)displaysDidChange:(NSNotification*)aNotification;
 
 @end
 
@@ -289,11 +264,6 @@ static bool ImGui_ImplOSX_HandleEvent(NSEvent* event, NSView* view);
     io.AddFocusEvent(false);
 }
 
-- (void)displaysDidChange:(NSNotification*)aNotification
-{
-    ImGui_ImplOSX_UpdateMonitors();
-}
-
 @end
 
 // Functions
@@ -448,15 +418,11 @@ bool ImGui_ImplOSX_Init(NSView* view)
     io.BackendPlatformName = "imgui_impl_osx";
     io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;           // We can honor GetMouseCursor() values (optional)
     //io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos;          // We can honor io.WantSetMousePos requests (optional, rarely used)
-    io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports;      // We can create multi-viewports on the Platform side (optional)
-    //io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport; // We can call io.AddMouseViewportEvent() with correct data (optional)
 
     bd->Observer = [ImGuiObserver new];
     bd->Window = view.window ?: NSApp.orderedWindows.firstObject;
     ImGuiViewport* main_viewport = ImGui::GetMainViewport();
     main_viewport->PlatformHandle = main_viewport->PlatformHandleRaw = (__bridge_retained void*)bd->Window;
-    ImGui_ImplOSX_UpdateMonitors();
-    ImGui_ImplOSX_InitMultiViewportSupport();
 
     // Load cursors. Some of them are undocumented.
     bd->MouseCursorHidden = false;
@@ -548,14 +514,14 @@ void ImGui_ImplOSX_Shutdown()
         bd->Monitor = nullptr;
     }
 
-    ImGui_ImplOSX_ShutdownMultiViewportSupport();
     ImGui_ImplOSX_DestroyBackendData();
+
     ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
     io.BackendPlatformName = nullptr;
     io.BackendPlatformUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasGamepad | ImGuiBackendFlags_PlatformHasViewports);
+    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasGamepad);
     platform_io.ClearPlatformHandlers();
 }
 
@@ -706,10 +672,10 @@ static ImGuiMouseSource GetMouseSource(NSEvent* event)
 static bool ImGui_ImplOSX_HandleEvent(NSEvent* event, NSView* view)
 {
     // Only process events from the window containing ImGui view
-    if (!ImGui::FindViewportByPlatformHandle((__bridge void*)event.window))
+    if (event.window != view.window)
         return false;
-
     ImGuiIO& io = ImGui::GetIO();
+
     if (event.type == NSEventTypeLeftMouseDown || event.type == NSEventTypeRightMouseDown || event.type == NSEventTypeOtherMouseDown)
     {
         int button = (int)[event buttonNumber];
@@ -734,23 +700,14 @@ static bool ImGui_ImplOSX_HandleEvent(NSEvent* event, NSView* view)
 
     if (event.type == NSEventTypeMouseMoved || event.type == NSEventTypeLeftMouseDragged || event.type == NSEventTypeRightMouseDragged || event.type == NSEventTypeOtherMouseDragged)
     {
-        NSPoint mousePoint;
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            mousePoint = NSEvent.mouseLocation;
-            mousePoint.y = CGDisplayPixelsHigh(kCGDirectMainDisplay) - mousePoint.y; // Normalize y coordinate to top-left of main display.
-        }
+        NSPoint mousePoint = event.locationInWindow;
+        if (event.window == nil)
+            mousePoint = [[view window] convertPointFromScreen:mousePoint];
+        mousePoint = [view convertPoint:mousePoint fromView:nil];
+        if ([view isFlipped])
+            mousePoint = NSMakePoint(mousePoint.x, mousePoint.y);
         else
-        {
-            mousePoint = event.locationInWindow;
-            if (event.window == nil)
-                mousePoint = [[view window] convertPointFromScreen:mousePoint];
-            mousePoint = [view convertPoint:mousePoint fromView:nil]; // Convert to local coordinates of view
-            if ([view isFlipped])
-                mousePoint = NSMakePoint(mousePoint.x, mousePoint.y);
-            else
-                mousePoint = NSMakePoint(mousePoint.x, view.bounds.size.height - mousePoint.y);
-        }
+            mousePoint = NSMakePoint(mousePoint.x, view.bounds.size.height - mousePoint.y);
         io.AddMouseSourceEvent(GetMouseSource(event));
         io.AddMousePosEvent((float)mousePoint.x, (float)mousePoint.y);
         return io.WantCaptureMouse;
@@ -876,300 +833,6 @@ static void ImGui_ImplOSX_AddTrackingArea(NSView* _Nonnull view)
     }];
 }
 
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the back-end to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-struct ImGui_ImplOSX_ViewportData
-{
-    NSWindow*        Window;
-    bool             WindowOwned;
-
-    ImGui_ImplOSX_ViewportData()  { WindowOwned = false; }
-    ~ImGui_ImplOSX_ViewportData() { IM_ASSERT(Window == nil); }
-};
-
-@interface ImGui_ImplOSX_Window: NSWindow
-@end
-
-@implementation ImGui_ImplOSX_Window
-
-- (BOOL)canBecomeKeyWindow
-{
-    return YES;
-}
-
-@end
-
-static void ConvertNSRect(NSRect* r)
-{
-    NSRect firstScreenFrame = NSScreen.screens[0].frame;
-    IM_ASSERT(firstScreenFrame.origin.x == 0 && firstScreenFrame.origin.y == 0);
-    r->origin.y = firstScreenFrame.size.height - r->origin.y - r->size.height;
-}
-
-static void ImGui_ImplOSX_CreateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplOSX_Data* bd = ImGui_ImplOSX_GetBackendData();
-    ImGui_ImplOSX_ViewportData* vd = IM_NEW(ImGui_ImplOSX_ViewportData)();
-    viewport->PlatformUserData = vd;
-
-    NSScreen* screen = bd->Window.screen;
-    NSRect rect = NSMakeRect(viewport->Pos.x, viewport->Pos.y, viewport->Size.x, viewport->Size.y);
-    ConvertNSRect(&rect);
-
-    NSWindowStyleMask styleMask = 0;
-    if (viewport->Flags & ImGuiViewportFlags_NoDecoration)
-        styleMask |= NSWindowStyleMaskBorderless;
-    else
-        styleMask |= NSWindowStyleMaskTitled | NSWindowStyleMaskResizable | NSWindowStyleMaskClosable | NSWindowStyleMaskMiniaturizable;
-
-    NSWindow* window = [[ImGui_ImplOSX_Window alloc] initWithContentRect:rect
-                                                               styleMask:styleMask
-                                                                 backing:NSBackingStoreBuffered
-                                                                   defer:YES
-                                                                  screen:screen];
-    if (viewport->Flags & ImGuiViewportFlags_TopMost)
-        [window setLevel:NSFloatingWindowLevel];
-
-    window.title = @"Untitled";
-    window.opaque = YES;
-
-    KeyEventResponder* view = [[KeyEventResponder alloc] initWithFrame:rect];
-    if (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_6 && ceil(NSAppKitVersionNumber) < NSAppKitVersionNumber10_15)
-        [view setWantsBestResolutionOpenGLSurface:YES];
-
-    window.contentView = view;
-
-    vd->Window = window;
-    vd->WindowOwned = true;
-    viewport->PlatformRequestResize = false;
-    viewport->PlatformHandle = viewport->PlatformHandleRaw = (__bridge_retained void*)window;
-}
-
-static void ImGui_ImplOSX_DestroyWindow(ImGuiViewport* viewport)
-{
-    if (ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData)
-    {
-        NSWindow* window = vd->Window;
-        if (window != nil && vd->WindowOwned)
-        {
-            window.contentView = nil;
-            window.contentViewController = nil;
-            [window orderOut:nil];
-        }
-        vd->Window = nil;
-        IM_DELETE(vd);
-    }
-    viewport->PlatformUserData = viewport->PlatformHandle = viewport->PlatformHandleRaw = nullptr;
-}
-
-static void ImGui_ImplOSX_ShowWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-
-    if (viewport->Flags & ImGuiViewportFlags_NoFocusOnAppearing)
-        [vd->Window orderFront:nil];
-    else
-        [vd->Window makeKeyAndOrderFront:nil];
-
-    [vd->Window setIsVisible:YES];
-}
-
-static ImVec2 ImGui_ImplOSX_GetWindowPos(ImGuiViewport* viewport)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-
-    NSWindow* window = vd->Window;
-    NSRect frame = window.frame;
-    NSRect contentRect = window.contentLayoutRect;
-    if (window.styleMask & NSWindowStyleMaskFullSizeContentView) // No title bar windows should be considered.
-        contentRect = frame;
-
-    NSRect firstScreenFrame = NSScreen.screens[0].frame;
-    return ImVec2(frame.origin.x, firstScreenFrame.size.height - frame.origin.y - contentRect.size.height);
-}
-
-static void ImGui_ImplOSX_SetWindowPos(ImGuiViewport* viewport, ImVec2 pos)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-
-    NSWindow* window = vd->Window;
-    NSSize size = window.frame.size;
-
-    NSRect r = NSMakeRect(pos.x, pos.y, size.width, size.height);
-    ConvertNSRect(&r);
-    [window setFrameOrigin:r.origin];
-}
-
-static ImVec2 ImGui_ImplOSX_GetWindowSize(ImGuiViewport* viewport)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-
-    NSWindow* window = vd->Window;
-    NSSize size = window.contentLayoutRect.size;
-    return ImVec2(size.width, size.height);
-}
-
-static void ImGui_ImplOSX_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-
-    NSWindow* window = vd->Window;
-    NSRect rect = window.frame;
-    rect.origin.y -= (size.y - rect.size.height);
-    rect.size.width = size.x;
-    rect.size.height = size.y;
-    [window setFrame:rect display:YES];
-}
-
-static ImVec2 ImGui_ImplOSX_GetWindowFramebufferScale(ImGuiViewport* viewport)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    NSWindow* window = vd->Window;
-    const float fb_scale = (float)[window backingScaleFactor];
-    return ImVec2(fb_scale, fb_scale);
-}
-
-static void ImGui_ImplOSX_SetWindowFocus(ImGuiViewport* viewport)
-{
-    ImGui_ImplOSX_Data* bd = ImGui_ImplOSX_GetBackendData();
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-    [vd->Window makeKeyAndOrderFront:bd->Window];
-}
-
-static bool ImGui_ImplOSX_GetWindowFocus(ImGuiViewport* viewport)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-
-    return vd->Window.isKeyWindow;
-}
-
-static bool ImGui_ImplOSX_GetWindowMinimized(ImGuiViewport* viewport)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-
-    return vd->Window.isMiniaturized;
-}
-
-static void ImGui_ImplOSX_SetWindowTitle(ImGuiViewport* viewport, const char* title)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-
-    vd->Window.title = [NSString stringWithUTF8String:title];
-}
-
-static void ImGui_ImplOSX_SetWindowAlpha(ImGuiViewport* viewport, float alpha)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-    IM_ASSERT(alpha >= 0.0f && alpha <= 1.0f);
-
-    vd->Window.alphaValue = alpha;
-}
-
-static float ImGui_ImplOSX_GetWindowDpiScale(ImGuiViewport* viewport)
-{
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Window != 0);
-
-    return vd->Window.backingScaleFactor;
-}
-
-static void ImGui_ImplOSX_UpdateMonitors()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Monitors.resize(0);
-
-    NSRect firstScreenFrame = NSScreen.screens[0].frame;
-    IM_ASSERT(firstScreenFrame.origin.x == 0 && firstScreenFrame.origin.y == 0);
-
-    for (NSScreen* screen in NSScreen.screens)
-    {
-        NSRect frame = screen.frame;
-        NSRect visibleFrame = screen.visibleFrame;
-        ConvertNSRect(&frame);
-        ConvertNSRect(&visibleFrame);
-
-        ImGuiPlatformMonitor imgui_monitor;
-        imgui_monitor.MainPos = ImVec2(frame.origin.x, frame.origin.y);
-        imgui_monitor.MainSize = ImVec2(frame.size.width, frame.size.height);
-        imgui_monitor.WorkPos = ImVec2(visibleFrame.origin.x, visibleFrame.origin.y);
-        imgui_monitor.WorkSize = ImVec2(visibleFrame.size.width, visibleFrame.size.height);
-        imgui_monitor.DpiScale = screen.backingScaleFactor;
-        imgui_monitor.PlatformHandle = (__bridge_retained void*)screen;
-
-        platform_io.Monitors.push_back(imgui_monitor);
-    }
-}
-
-static void ImGui_ImplOSX_InitMultiViewportSupport()
-{
-    ImGui_ImplOSX_Data* bd = ImGui_ImplOSX_GetBackendData();
-
-    // Register platform interface (will be coupled with a renderer interface)
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Platform_CreateWindow = ImGui_ImplOSX_CreateWindow;
-    platform_io.Platform_DestroyWindow = ImGui_ImplOSX_DestroyWindow;
-    platform_io.Platform_ShowWindow = ImGui_ImplOSX_ShowWindow;
-    platform_io.Platform_SetWindowPos = ImGui_ImplOSX_SetWindowPos;
-    platform_io.Platform_GetWindowPos = ImGui_ImplOSX_GetWindowPos;
-    platform_io.Platform_SetWindowSize = ImGui_ImplOSX_SetWindowSize;
-    platform_io.Platform_GetWindowSize = ImGui_ImplOSX_GetWindowSize;
-    platform_io.Platform_GetWindowFramebufferScale = ImGui_ImplOSX_GetWindowFramebufferScale;
-    platform_io.Platform_SetWindowFocus = ImGui_ImplOSX_SetWindowFocus;
-    platform_io.Platform_GetWindowFocus = ImGui_ImplOSX_GetWindowFocus;
-    platform_io.Platform_GetWindowMinimized = ImGui_ImplOSX_GetWindowMinimized;
-    platform_io.Platform_SetWindowTitle = ImGui_ImplOSX_SetWindowTitle;
-    platform_io.Platform_SetWindowAlpha = ImGui_ImplOSX_SetWindowAlpha;
-    platform_io.Platform_GetWindowDpiScale = ImGui_ImplOSX_GetWindowDpiScale; // FIXME-DPI
-
-    // Register main window handle (which is owned by the main application, not by us)
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    ImGui_ImplOSX_ViewportData* vd = IM_NEW(ImGui_ImplOSX_ViewportData)();
-    vd->Window = bd->Window;
-    vd->WindowOwned = false;
-    main_viewport->PlatformUserData = vd;
-    main_viewport->PlatformHandle = (__bridge void*)bd->Window;
-
-    [NSNotificationCenter.defaultCenter addObserver:bd->Observer
-                                           selector:@selector(displaysDidChange:)
-                                               name:NSApplicationDidChangeScreenParametersNotification
-                                             object:nil];
-}
-
-static void ImGui_ImplOSX_ShutdownMultiViewportSupport()
-{
-    ImGui_ImplOSX_Data* bd = ImGui_ImplOSX_GetBackendData();
-    [NSNotificationCenter.defaultCenter removeObserver:bd->Observer
-                                                  name:NSApplicationDidChangeScreenParametersNotification
-                                                object:nil];
-    bd->Observer = nullptr;
-    bd->Window = nullptr;
-    if (bd->Monitor != nullptr)
-    {
-        [NSEvent removeMonitor:bd->Monitor];
-        bd->Monitor = nullptr;
-    }
-
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)main_viewport->PlatformUserData;
-    IM_DELETE(vd);
-    main_viewport->PlatformUserData = nullptr;
-    ImGui::DestroyPlatformWindows();
-}
-
 //-----------------------------------------------------------------------------
 
 #endif // #ifndef IMGUI_DISABLE

backends/imgui_impl_sdl2.cpp

@@ -10,10 +10,6 @@
 //  [X] Platform: Gamepad support.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
 //  [X] Platform: Basic IME support. App needs to call 'SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");' before SDL_CreateWindow()!.
-//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
-// Missing features or Issues:
-//  [ ] Platform: Multi-viewport: Minimized windows seems to break mouse wheel events (at least under Windows).
-//  [ ] Platform: Multi-viewport: Missing ImGuiBackendFlags_HasParentViewport support. The viewport->ParentViewportID field is ignored, and therefore io.ConfigViewportsNoDefaultParent has no effect either.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -25,8 +21,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
-//  2026-03-09: [Docking] Fixed an issue dated 2025/04/09 (1.92 WIP) where a refactor+merge caused ImGuiBackendFlags_HasMouseHoveredViewport to never be set, causing foreign windows to be ignored when deciding of hovered viewport. (#9284)
+//  2026-04-16: Made ImGui_ImplSDL2_GetContentScaleForWindow(), ImGui_ImplSDL2_GetContentScaleForDisplay() helpers return a minimum of 1.0f, as some Linux setup seems to report <1.0f value and this breaks scaling border size. (#9369)
 //  2026-02-13: Inputs: systems other than X11 are back to starting mouse capture on mouse down (reverts 2025-02-26 change). Only X11 requires waiting for a drag by default (not ideal, but a better default for X11 users). Added ImGui_ImplSDL2_SetMouseCaptureMode() for X11 debugger users. (#3650, #6410, #9235)
 //  2026-01-15: Changed GetClipboardText() handler to return nullptr on error aka clipboard contents is not text. Consistent with other backends. (#9168)
 //  2025-09-24: Skip using the SDL_GetGlobalMouseState() state when one of our window is hovered, as the SDL_MOUSEMOTION data is reliable. Fix macOS notch mouse coordinates issue in fullscreen mode + better perf on X11. (#7919, #7786)
@@ -34,15 +29,11 @@
 //  2025-09-15: Content Scales are always reported as 1.0 on Wayland. (#8921)
 //  2025-07-08: Made ImGui_ImplSDL2_GetContentScaleForWindow(), ImGui_ImplSDL2_GetContentScaleForDisplay() helpers return 1.0f on Emscripten and Android platforms, matching macOS logic. (#8742, #8733)
 //  2025-06-11: Added ImGui_ImplSDL2_GetContentScaleForWindow(SDL_Window* window) and ImGui_ImplSDL2_GetContentScaleForDisplay(int display_index) helper to facilitate making DPI-aware apps.
-//  2025-05-15: [Docking] Add Platform_GetWindowFramebufferScale() handler, to allow varying Retina display density on multiple monitors.
-//  2025-04-09: [Docking] Revert update monitors and work areas information every frame. Only do it on Windows. (#8415, #8558)
 //  2025-04-09: Don't attempt to call SDL_CaptureMouse() on drivers where we don't call SDL_GetGlobalMouseState(). (#8561)
 //  2025-03-21: Fill gamepad inputs and set ImGuiBackendFlags_HasGamepad regardless of ImGuiConfigFlags_NavEnableGamepad being set.
 //  2025-03-10: When dealing with OEM keys, use scancodes instead of translated keycodes to choose ImGuiKey values. (#7136, #7201, #7206, #7306, #7670, #7672, #8468)
 //  2025-02-26: Only start SDL_CaptureMouse() when mouse is being dragged, to mitigate issues with e.g. Linux debuggers not claiming capture back. (#6410, #3650)
-//  2025-02-25: [Docking] Revert to use SDL_GetDisplayBounds() for WorkPos/WorkRect if SDL_GetDisplayUsableBounds() failed.
 //  2025-02-24: Avoid calling SDL_GetGlobalMouseState() when mouse is in relative mode.
-//  2025-02-21: [Docking] Update monitors and work areas information every frame, as the later may change regardless of monitor changes. (#8415)
 //  2025-02-18: Added ImGuiMouseCursor_Wait and ImGuiMouseCursor_Progress mouse cursor support.
 //  2025-02-10: Using SDL_OpenURL() in platform_io.Platform_OpenInShellFn handler.
 //  2025-01-20: Made ImGui_ImplSDL2_SetGamepadMode(ImGui_ImplSDL2_GamepadMode_Manual) accept an empty array.
@@ -83,7 +74,7 @@
 //  2022-01-10: Inputs: calling new io.AddKeyEvent(), io.AddKeyModsEvent() + io.SetKeyEventNativeData() API (1.87+). Support for full ImGuiKey range.
 //  2021-08-17: Calling io.AddFocusEvent() on SDL_WINDOWEVENT_FOCUS_GAINED/SDL_WINDOWEVENT_FOCUS_LOST.
 //  2021-07-29: Inputs: MousePos is correctly reported when the host platform window is hovered but not focused (using SDL_GetMouseFocus() + SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, requires SDL 2.0.5+)
-//  2021-06:29: *BREAKING CHANGE* Removed 'SDL_Window* window' parameter to ImGui_ImplSDL2_NewFrame() which was unnecessary.
+//  2021-06-29: *BREAKING CHANGE* Removed 'SDL_Window* window' parameter to ImGui_ImplSDL2_NewFrame() which was unnecessary.
 //  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
 //  2021-03-22: Rework global mouse pos availability check listing supported platforms explicitly, effectively fixing mouse access on Raspberry Pi. (#2837, #3950)
 //  2020-05-25: Misc: Report a zero display-size when window is minimized, to be consistent with other backends.
@@ -125,7 +116,6 @@
 #endif
 
 // SDL
-// (the multi-viewports feature requires SDL features supported from SDL 2.0.4+. SDL 2.0.5+ is highly recommended)
 #include <SDL.h>
 #include <SDL_syswm.h>
 #include <stdio.h>              // for snprintf()
@@ -142,18 +132,11 @@
 #else
 #define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE    0
 #endif
-#define SDL_HAS_WINDOW_ALPHA                SDL_VERSION_ATLEAST(2,0,5)
-#define SDL_HAS_ALWAYS_ON_TOP               SDL_VERSION_ATLEAST(2,0,5)
-#define SDL_HAS_USABLE_DISPLAY_BOUNDS       SDL_VERSION_ATLEAST(2,0,5)
 #define SDL_HAS_PER_MONITOR_DPI             SDL_VERSION_ATLEAST(2,0,4)
 #define SDL_HAS_VULKAN                      SDL_VERSION_ATLEAST(2,0,6)
-#define SDL_HAS_DISPLAY_EVENT               SDL_VERSION_ATLEAST(2,0,9)
 #define SDL_HAS_OPEN_URL                    SDL_VERSION_ATLEAST(2,0,14)
-#define SDL_HAS_SHOW_WINDOW_ACTIVATION_HINT SDL_VERSION_ATLEAST(2,0,18)
 #if SDL_HAS_VULKAN
 #include <SDL_vulkan.h>
-#else
-static const Uint32 SDL_WINDOW_VULKAN = 0x10000000;
 #endif
 
 // SDL Data
@@ -165,8 +148,6 @@ struct ImGui_ImplSDL2_Data
     Uint64                  Time;
     char*                   ClipboardTextData;
     char                    BackendPlatformName[48];
-    bool                    UseVulkan;
-    bool                    WantUpdateMonitors;
 
     // Mouse handling
     Uint32                  MouseWindowID;
@@ -175,7 +156,6 @@ struct ImGui_ImplSDL2_Data
     SDL_Cursor*             MouseLastCursor;
     int                     MouseLastLeaveFrame;
     bool                    MouseCanUseGlobalState;
-    bool                    MouseCanReportHoveredViewport;  // This is hard to use/unreliable on SDL so we'll set ImGuiBackendFlags_HasMouseHoveredViewport dynamically based on state.
     ImGui_ImplSDL2_MouseCaptureMode MouseCaptureMode;
 
     // Gamepad handling
@@ -195,11 +175,6 @@ static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_GetBackendData()
     return ImGui::GetCurrentContext() ? (ImGui_ImplSDL2_Data*)ImGui::GetIO().BackendPlatformUserData : nullptr;
 }
 
-// Forward Declarations
-static void ImGui_ImplSDL2_UpdateMonitors();
-static void ImGui_ImplSDL2_InitMultiViewportSupport(SDL_Window* window, void* sdl_gl_context);
-static void ImGui_ImplSDL2_ShutdownMultiViewportSupport();
-
 // Functions
 static const char* ImGui_ImplSDL2_GetClipboardText(ImGuiContext*)
 {
@@ -219,13 +194,13 @@ static void ImGui_ImplSDL2_SetClipboardText(ImGuiContext*, const char* text)
 }
 
 // Note: native IME will only display if user calls SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1") _before_ SDL_CreateWindow().
-static void ImGui_ImplSDL2_PlatformSetImeData(ImGuiContext*, ImGuiViewport* viewport, ImGuiPlatformImeData* data)
+static void ImGui_ImplSDL2_PlatformSetImeData(ImGuiContext*, ImGuiViewport*, ImGuiPlatformImeData* data)
 {
     if (data->WantVisible)
     {
         SDL_Rect r;
-        r.x = (int)(data->InputPos.x - viewport->Pos.x);
-        r.y = (int)(data->InputPos.y - viewport->Pos.y);
+        r.x = (int)data->InputPos.x;
+        r.y = (int)data->InputPos.y;
         r.w = 1;
         r.h = (int)data->InputLineHeight;
         SDL_SetTextInputRect(&r);
@@ -391,7 +366,8 @@ static void ImGui_ImplSDL2_UpdateKeyModifiers(SDL_Keymod sdl_key_mods)
 
 static ImGuiViewport* ImGui_ImplSDL2_GetViewportForWindowID(Uint32 window_id)
 {
-    return ImGui::FindViewportByPlatformHandle((void*)(intptr_t)window_id);
+    ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
+    return (window_id == bd->WindowID) ? ImGui::GetMainViewport() : nullptr;
 }
 
 // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
@@ -411,13 +387,6 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
             if (ImGui_ImplSDL2_GetViewportForWindowID(event->motion.windowID) == nullptr)
                 return false;
             ImVec2 mouse_pos((float)event->motion.x, (float)event->motion.y);
-            if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-            {
-                int window_x, window_y;
-                SDL_GetWindowPosition(SDL_GetWindowFromID(event->motion.windowID), &window_x, &window_y);
-                mouse_pos.x += window_x;
-                mouse_pos.y += window_y;
-            }
             io.AddMouseSourceEvent(event->motion.which == SDL_TOUCH_MOUSEID ? ImGuiMouseSource_TouchScreen : ImGuiMouseSource_Mouse);
             io.AddMousePosEvent(mouse_pos.x, mouse_pos.y);
             return true;
@@ -469,32 +438,20 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
         case SDL_KEYDOWN:
         case SDL_KEYUP:
         {
-            ImGuiViewport* viewport = ImGui_ImplSDL2_GetViewportForWindowID(event->key.windowID);
-            if (viewport == nullptr)
+            if (ImGui_ImplSDL2_GetViewportForWindowID(event->key.windowID) == nullptr)
                 return false;
-            //IMGUI_DEBUG_LOG("SDL_KEY%s : key=0x%08X ('%s'), scancode=%d ('%s'), mod=%X, windowID=%d, viewport=%08X\n",
-            //    (event->type == SDL_KEYDOWN) ? "DOWN" : "UP  ", event->key.keysym.sym, SDL_GetKeyName(event->key.keysym.sym), event->key.keysym.scancode, SDL_GetScancodeName(event->key.keysym.scancode), event->key.keysym.mod, event->key.windowID, viewport ? viewport->ID : 0);
             ImGui_ImplSDL2_UpdateKeyModifiers((SDL_Keymod)event->key.keysym.mod);
+            //IMGUI_DEBUG_LOG("SDL_KEY_%s : key=%d ('%s'), scancode=%d ('%s'), mod=%X\n",
+            //    (event->type == SDL_KEYDOWN) ? "DOWN" : "UP  ", event->key.keysym.sym, SDL_GetKeyName(event->key.keysym.sym), event->key.keysym.scancode, SDL_GetScancodeName(event->key.keysym.scancode), event->key.keysym.mod);
             ImGuiKey key = ImGui_ImplSDL2_KeyEventToImGuiKey(event->key.keysym.sym, event->key.keysym.scancode);
             io.AddKeyEvent(key, (event->type == SDL_KEYDOWN));
             io.SetKeyEventNativeData(key, (int)event->key.keysym.sym, (int)event->key.keysym.scancode, (int)event->key.keysym.scancode); // To support legacy indexing (<1.87 user code). Legacy backend uses SDLK_*** as indices to IsKeyXXX() functions.
             return true;
         }
-#if SDL_HAS_DISPLAY_EVENT
-        case SDL_DISPLAYEVENT:
-        {
-            // 2.0.26 has SDL_DISPLAYEVENT_CONNECTED/SDL_DISPLAYEVENT_DISCONNECTED/SDL_DISPLAYEVENT_ORIENTATION,
-            // so change of DPI/Scaling are not reflected in this event. (SDL3 has it)
-            bd->WantUpdateMonitors = true;
-            return true;
-        }
-#endif
         case SDL_WINDOWEVENT:
         {
-            ImGuiViewport* viewport = ImGui_ImplSDL2_GetViewportForWindowID(event->window.windowID);
-            if (viewport == NULL)
+            if (ImGui_ImplSDL2_GetViewportForWindowID(event->window.windowID) == nullptr)
                 return false;
-
             // - When capturing mouse, SDL will send a bunch of conflicting LEAVE/ENTER event on every mouse move, but the final ENTER tends to be right.
             // - However we won't get a correct LEAVE event for a captured window.
             // - In some cases, when detaching a window from main viewport SDL may send SDL_WINDOWEVENT_ENTER one frame too late,
@@ -508,18 +465,10 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
             }
             if (window_event == SDL_WINDOWEVENT_LEAVE)
                 bd->MouseLastLeaveFrame = ImGui::GetFrameCount() + 1;
-            //if (window_event == SDL_WINDOWEVENT_FOCUS_GAINED) { IMGUI_DEBUG_LOG("SDL_WINDOWEVENT_FOCUS_GAINED: windowId %d, viewport: %08X\n", event->window.windowID, viewport ? viewport->ID : 0); }
-            //if (window_event == SDL_WINDOWEVENT_FOCUS_LOST) { IMGUI_DEBUG_LOG("SDL_WINDOWEVENT_FOCUS_LOST: windowId %d, viewport: %08X\n", event->window.windowID, viewport ? viewport->ID : 0); }
             if (window_event == SDL_WINDOWEVENT_FOCUS_GAINED)
                 io.AddFocusEvent(true);
             if (window_event == SDL_WINDOWEVENT_FOCUS_LOST)
                 io.AddFocusEvent(false);
-            if (window_event == SDL_WINDOWEVENT_CLOSE)
-                viewport->PlatformRequestClose = true;
-            if (window_event == SDL_WINDOWEVENT_MOVED)
-                viewport->PlatformRequestMove = true;
-            if (window_event == SDL_WINDOWEVENT_RESIZED)
-                viewport->PlatformRequestResize = true;
             return true;
         }
         case SDL_CONTROLLERDEVICEADDED:
@@ -559,7 +508,6 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer, void
     io.BackendPlatformName = bd->BackendPlatformName;
     io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;           // We can honor GetMouseCursor() values (optional)
     io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos;            // We can honor io.WantSetMousePos requests (optional, rarely used)
-    // (ImGuiBackendFlags_PlatformHasViewports may be set just below)
 
     bd->Window = window;
     bd->WindowID = SDL_GetWindowID(window);
@@ -579,16 +527,6 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer, void
             bd->MouseCaptureMode = (strcmp(item, "x11") == 0) ? ImGui_ImplSDL2_MouseCaptureMode_EnabledAfterDrag : ImGui_ImplSDL2_MouseCaptureMode_Enabled;
         }
 #endif
-    if (bd->MouseCanUseGlobalState)
-        io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports;  // We can create multi-viewports on the Platform side (optional)
-
-    // SDL on Linux/OSX doesn't report events for unfocused windows (see https://github.com/ocornut/imgui/issues/4960)
-    // We will use 'MouseCanReportHoveredViewport' to set 'ImGuiBackendFlags_HasMouseHoveredViewport' dynamically each frame.
-#ifndef __APPLE__
-    bd->MouseCanReportHoveredViewport = bd->MouseCanUseGlobalState;
-#else
-    bd->MouseCanReportHoveredViewport = false;
-#endif
 
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     platform_io.Platform_SetClipboardTextFn = ImGui_ImplSDL2_SetClipboardText;
@@ -601,9 +539,6 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer, void
     platform_io.Platform_OpenInShellFn = [](ImGuiContext*, const char* url) { return SDL_OpenURL(url) == 0; };
 #endif
 
-    // Update monitor a first time during init
-    ImGui_ImplSDL2_UpdateMonitors();
-
     // Gamepad handling
     bd->GamepadMode = ImGui_ImplSDL2_GamepadMode_AutoFirst;
     bd->WantUpdateGamepadsList = true;
@@ -658,11 +593,7 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer, void
     SDL_SetHint(SDL_HINT_MOUSE_AUTO_CAPTURE, "0");
 #endif
 
-    // We need SDL_CaptureMouse(), SDL_GetGlobalMouseState() from SDL 2.0.4+ to support multiple viewports.
-    // We left the call to ImGui_ImplSDL2_InitMultiViewportSupport() outside of #ifdef to avoid unused-function warnings.
-    if (io.BackendFlags & ImGuiBackendFlags_PlatformHasViewports)
-        ImGui_ImplSDL2_InitMultiViewportSupport(window, sdl_gl_context);
-
+    (void)sdl_gl_context; // Unused in 'master' branch.
     return true;
 }
 
@@ -676,11 +607,7 @@ bool ImGui_ImplSDL2_InitForVulkan(SDL_Window* window)
 #if !SDL_HAS_VULKAN
     IM_ASSERT(0 && "Unsupported");
 #endif
-    if (!ImGui_ImplSDL2_Init(window, nullptr, nullptr))
-        return false;
-    ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
-    bd->UseVulkan = true;
-    return true;
+    return ImGui_ImplSDL2_Init(window, nullptr, nullptr);
 }
 
 bool ImGui_ImplSDL2_InitForD3D(SDL_Window* window)
@@ -715,7 +642,6 @@ void ImGui_ImplSDL2_Shutdown()
     ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
-    ImGui_ImplSDL2_ShutdownMultiViewportSupport();
     if (bd->ClipboardTextData)
         SDL_free(bd->ClipboardTextData);
     for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
@@ -724,7 +650,7 @@ void ImGui_ImplSDL2_Shutdown()
 
     io.BackendPlatformName = nullptr;
     io.BackendPlatformUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasSetMousePos | ImGuiBackendFlags_HasGamepad | ImGuiBackendFlags_PlatformHasViewports | ImGuiBackendFlags_HasMouseHoveredViewport);
+    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasSetMousePos | ImGuiBackendFlags_HasGamepad);
     platform_io.ClearPlatformHandlers();
     IM_DELETE(bd);
 }
@@ -737,7 +663,6 @@ void ImGui_ImplSDL2_SetMouseCaptureMode(ImGui_ImplSDL2_MouseCaptureMode mode)
     bd->MouseCaptureMode = mode;
 }
 
-// This code is rather messy because some of the functions we need for full viewport support are not available in SDL < 2.0.4.
 static void ImGui_ImplSDL2_UpdateMouseData()
 {
     ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
@@ -761,24 +686,16 @@ static void ImGui_ImplSDL2_UpdateMouseData()
     }
 
     SDL_Window* focused_window = SDL_GetKeyboardFocus();
-    const bool is_app_focused = (focused_window && (bd->Window == focused_window || ImGui_ImplSDL2_GetViewportForWindowID(SDL_GetWindowID(focused_window)) != NULL));
+    const bool is_app_focused = (bd->Window == focused_window);
 #else
     SDL_Window* focused_window = bd->Window;
     const bool is_app_focused = (SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_INPUT_FOCUS) != 0; // SDL 2.0.3 and non-windowed systems: single-viewport only
 #endif
-
     if (is_app_focused)
     {
         // (Optional) Set OS mouse position from Dear ImGui if requested (rarely used, only when io.ConfigNavMoveSetMousePos is enabled by user)
         if (io.WantSetMousePos)
-        {
-#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE
-            if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-                SDL_WarpMouseGlobal((int)io.MousePos.x, (int)io.MousePos.y);
-            else
-#endif
-                SDL_WarpMouseInWindow(bd->Window, (int)io.MousePos.x, (int)io.MousePos.y);
-        }
+            SDL_WarpMouseInWindow(bd->Window, (int)io.MousePos.x, (int)io.MousePos.y);
 
         // (Optional) Fallback to provide unclamped mouse position when focused but not hovered (SDL_MOUSEMOTION already provides this when hovered or captured)
         // Note that SDL_GetGlobalMouseState() is in theory slow on X11, but this only runs on rather specific cases. If a problem we may provide a way to opt-out this feature.
@@ -787,34 +704,15 @@ static void ImGui_ImplSDL2_UpdateMouseData()
         if (hovered_window == nullptr && bd->MouseCanUseGlobalState && bd->MouseButtonsDown == 0 && !is_relative_mouse_mode)
         {
             // Single-viewport mode: mouse position in client window coordinates (io.MousePos is (0,0) when the mouse is on the upper-left corner of the app window)
-            // Multi-viewport mode: mouse position in OS absolute coordinates (io.MousePos is (0,0) when the mouse is on the upper-left of the primary monitor)
             int mouse_x, mouse_y;
             int window_x, window_y;
             SDL_GetGlobalMouseState(&mouse_x, &mouse_y);
-            if (!(io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable))
-            {
-                SDL_GetWindowPosition(focused_window, &window_x, &window_y);
-                mouse_x -= window_x;
-                mouse_y -= window_y;
-            }
+            SDL_GetWindowPosition(focused_window, &window_x, &window_y);
+            mouse_x -= window_x;
+            mouse_y -= window_y;
             io.AddMousePosEvent((float)mouse_x, (float)mouse_y);
         }
     }
-
-    // (Optional) When using multiple viewports: call io.AddMouseViewportEvent() with the viewport the OS mouse cursor is hovering.
-    // If ImGuiBackendFlags_HasMouseHoveredViewport is not set by the backend, Dear imGui will ignore this field and infer the information using its flawed heuristic.
-    // - [!] SDL backend does NOT correctly ignore viewports with the _NoInputs flag.
-    //       Some backend are not able to handle that correctly. If a backend report an hovered viewport that has the _NoInputs flag (e.g. when dragging a window
-    //       for docking, the viewport has the _NoInputs flag in order to allow us to find the viewport under), then Dear ImGui is forced to ignore the value reported
-    //       by the backend, and use its flawed heuristic to guess the viewport behind.
-    // - [X] SDL backend correctly reports this regardless of another viewport behind focused and dragged from (we need this to find a useful drag and drop target).
-    if (io.BackendFlags & ImGuiBackendFlags_HasMouseHoveredViewport)
-    {
-        ImGuiID mouse_viewport_id = 0;
-        if (ImGuiViewport* mouse_viewport = ImGui_ImplSDL2_GetViewportForWindowID(bd->MouseWindowID))
-            mouse_viewport_id = mouse_viewport->ID;
-        io.AddMouseViewportEvent(mouse_viewport_id);
-    }
 }
 
 static void ImGui_ImplSDL2_UpdateMouseCursor()
@@ -851,6 +749,7 @@ float ImGui_ImplSDL2_GetContentScaleForWindow(SDL_Window* window)
     return ImGui_ImplSDL2_GetContentScaleForDisplay(SDL_GetWindowDisplayIndex(window));
 }
 
+// SDL_GetDisplayDPI() seems rather unreliable on Linux.
 float ImGui_ImplSDL2_GetContentScaleForDisplay(int display_index)
 {
     const char* sdl_driver = SDL_GetCurrentVideoDriver();
@@ -860,7 +759,11 @@ float ImGui_ImplSDL2_GetContentScaleForDisplay(int display_index)
 #if !defined(__APPLE__) && !defined(__EMSCRIPTEN__) && !defined(__ANDROID__)
     float dpi = 0.0f;
     if (SDL_GetDisplayDPI(display_index, &dpi, nullptr, nullptr) == 0)
+    {
+        if (dpi < 96.0f)
+            dpi = 96.0f;
         return dpi / 96.0f;
+    }
 #endif
 #endif
     IM_UNUSED(display_index);
@@ -969,38 +872,6 @@ static void ImGui_ImplSDL2_UpdateGamepads()
     ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadRStickDown,  SDL_CONTROLLER_AXIS_RIGHTY, +thumb_dead_zone, +32767);
 }
 
-// FIXME: Note that doesn't update with DPI/Scaling change only as SDL2 doesn't have an event for it (SDL3 has).
-static void ImGui_ImplSDL2_UpdateMonitors()
-{
-    ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Monitors.resize(0);
-    bd->WantUpdateMonitors = false;
-    int display_count = SDL_GetNumVideoDisplays();
-    for (int n = 0; n < display_count; n++)
-    {
-        // Warning: the validity of monitor DPI information on Windows depends on the application DPI awareness settings, which generally needs to be set in the manifest or at runtime.
-        ImGuiPlatformMonitor monitor;
-        SDL_Rect r;
-        SDL_GetDisplayBounds(n, &r);
-        monitor.MainPos = monitor.WorkPos = ImVec2((float)r.x, (float)r.y);
-        monitor.MainSize = monitor.WorkSize = ImVec2((float)r.w, (float)r.h);
-#if SDL_HAS_USABLE_DISPLAY_BOUNDS
-        if (SDL_GetDisplayUsableBounds(n, &r) == 0 && r.w > 0 && r.h > 0)
-        {
-            monitor.WorkPos = ImVec2((float)r.x, (float)r.y);
-            monitor.WorkSize = ImVec2((float)r.w, (float)r.h);
-        }
-#endif
-        float dpi_scale = ImGui_ImplSDL2_GetContentScaleForDisplay(n);
-        if (dpi_scale <= 0.0f)
-            continue; // Some accessibility applications are declaring virtual monitors with a DPI of 0, see #7902.
-        monitor.DpiScale = dpi_scale;
-        monitor.PlatformHandle = (void*)(intptr_t)n;
-        platform_io.Monitors.push_back(monitor);
-    }
-}
-
 static void ImGui_ImplSDL2_GetWindowSizeAndFramebufferScale(SDL_Window* window, SDL_Renderer* renderer, ImVec2* out_size, ImVec2* out_framebuffer_scale)
 {
     int w, h;
@@ -1019,7 +890,7 @@ static void ImGui_ImplSDL2_GetWindowSizeAndFramebufferScale(SDL_Window* window,
     if (out_size != nullptr)
         *out_size = ImVec2((float)w, (float)h);
     if (out_framebuffer_scale != nullptr)
-        *out_framebuffer_scale = (w > 0 && h > 0) ? ImVec2((float)display_w / w, (float)display_h / h) : ImVec2(1.0f, 1.0f);
+        *out_framebuffer_scale = (w > 0 && h > 0) ? ImVec2((float)display_w / (float)w, (float)display_h / (float)h) : ImVec2(1.0f, 1.0f);
 }
 
 void ImGui_ImplSDL2_NewFrame()
@@ -1031,20 +902,13 @@ void ImGui_ImplSDL2_NewFrame()
     // Setup main viewport size (every frame to accommodate for window resizing)
     ImGui_ImplSDL2_GetWindowSizeAndFramebufferScale(bd->Window, bd->Renderer, &io.DisplaySize, &io.DisplayFramebufferScale);
 
-    // Update monitors
-#ifdef WIN32
-    bd->WantUpdateMonitors = true; // Keep polling under Windows to handle changes of work area when resizing task-bar (#8415)
-#endif
-    if (bd->WantUpdateMonitors)
-        ImGui_ImplSDL2_UpdateMonitors();
-
     // Setup time step (we don't use SDL_GetTicks() because it is using millisecond resolution)
     // (Accept SDL_GetPerformanceCounter() not returning a monotonically increasing value. Happens in VMs and Emscripten, see #6189, #6114, #3644)
     static Uint64 frequency = SDL_GetPerformanceFrequency();
     Uint64 current_time = SDL_GetPerformanceCounter();
     if (current_time <= bd->Time)
         current_time = bd->Time + 1;
-    io.DeltaTime = bd->Time > 0 ? (float)((double)(current_time - bd->Time) / frequency) : (float)(1.0f / 60.0f);
+    io.DeltaTime = bd->Time > 0 ? (float)((double)(current_time - bd->Time) / (double)frequency) : (float)(1.0f / 60.0f);
     bd->Time = current_time;
 
     if (bd->MouseLastLeaveFrame && bd->MouseLastLeaveFrame >= ImGui::GetFrameCount() && bd->MouseButtonsDown == 0)
@@ -1054,13 +918,6 @@ void ImGui_ImplSDL2_NewFrame()
         io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
     }
 
-    // Our io.AddMouseViewportEvent() calls will only be valid when not capturing.
-    // Technically speaking testing for 'bd->MouseButtonsDown == 0' would be more rigorous, but testing for payload reduces noise and potential side-effects.
-    if (bd->MouseCanReportHoveredViewport && ImGui::GetDragDropPayload() == nullptr)
-        io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport;
-    else
-        io.BackendFlags &= ~ImGuiBackendFlags_HasMouseHoveredViewport;
-
     ImGui_ImplSDL2_UpdateMouseData();
     ImGui_ImplSDL2_UpdateMouseCursor();
 
@@ -1068,266 +925,6 @@ void ImGui_ImplSDL2_NewFrame()
     ImGui_ImplSDL2_UpdateGamepads();
 }
 
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-// Helper structure we store in the void* PlatformUserData field of each ImGuiViewport to easily retrieve our backend data.
-struct ImGui_ImplSDL2_ViewportData
-{
-    SDL_Window*     Window;
-    Uint32          WindowID;       // Stored in ImGuiViewport::PlatformHandle. Use SDL_GetWindowFromID() to get SDL_Window* from Uint32 WindowID.
-    bool            WindowOwned;
-    SDL_GLContext   GLContext;
-
-    ImGui_ImplSDL2_ViewportData()   { Window = nullptr; WindowID = 0; WindowOwned = false; GLContext = nullptr; }
-    ~ImGui_ImplSDL2_ViewportData()  { IM_ASSERT(Window == nullptr && GLContext == nullptr); }
-};
-
-static void ImGui_ImplSDL2_CreateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
-    ImGui_ImplSDL2_ViewportData* vd = IM_NEW(ImGui_ImplSDL2_ViewportData)();
-    viewport->PlatformUserData = vd;
-
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    ImGui_ImplSDL2_ViewportData* main_viewport_data = (ImGui_ImplSDL2_ViewportData*)main_viewport->PlatformUserData;
-
-    // Share GL resources with main context
-    bool use_opengl = (main_viewport_data->GLContext != nullptr);
-    SDL_GLContext backup_context = nullptr;
-    if (use_opengl)
-    {
-        backup_context = SDL_GL_GetCurrentContext();
-        SDL_GL_SetAttribute(SDL_GL_SHARE_WITH_CURRENT_CONTEXT, 1);
-        SDL_GL_MakeCurrent(main_viewport_data->Window, main_viewport_data->GLContext);
-    }
-
-    Uint32 sdl_flags = 0;
-    sdl_flags |= use_opengl ? SDL_WINDOW_OPENGL : (bd->UseVulkan ? SDL_WINDOW_VULKAN : 0);
-    sdl_flags |= SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_ALLOW_HIGHDPI;
-    sdl_flags |= SDL_WINDOW_HIDDEN;
-    sdl_flags |= (viewport->Flags & ImGuiViewportFlags_NoDecoration) ? SDL_WINDOW_BORDERLESS : 0;
-    sdl_flags |= (viewport->Flags & ImGuiViewportFlags_NoDecoration) ? 0 : SDL_WINDOW_RESIZABLE;
-#if !defined(_WIN32)
-    // See SDL hack in ImGui_ImplSDL2_ShowWindow().
-    sdl_flags |= (viewport->Flags & ImGuiViewportFlags_NoTaskBarIcon) ? SDL_WINDOW_SKIP_TASKBAR : 0;
-#endif
-#if SDL_HAS_ALWAYS_ON_TOP
-    sdl_flags |= (viewport->Flags & ImGuiViewportFlags_TopMost) ? SDL_WINDOW_ALWAYS_ON_TOP : 0;
-#endif
-    vd->Window = SDL_CreateWindow("No Title Yet", (int)viewport->Pos.x, (int)viewport->Pos.y, (int)viewport->Size.x, (int)viewport->Size.y, sdl_flags);
-    vd->WindowOwned = true;
-    if (use_opengl)
-    {
-        vd->GLContext = SDL_GL_CreateContext(vd->Window);
-        SDL_GL_SetSwapInterval(0);
-    }
-    if (use_opengl && backup_context)
-        SDL_GL_MakeCurrent(vd->Window, backup_context);
-
-    viewport->PlatformHandle = (void*)(intptr_t)SDL_GetWindowID(vd->Window);
-    viewport->PlatformHandleRaw = nullptr;
-    SDL_SysWMinfo info;
-    SDL_VERSION(&info.version);
-    if (SDL_GetWindowWMInfo(vd->Window, &info))
-    {
-#if defined(SDL_VIDEO_DRIVER_WINDOWS)
-        viewport->PlatformHandleRaw = info.info.win.window;
-#elif defined(__APPLE__) && defined(SDL_VIDEO_DRIVER_COCOA)
-        viewport->PlatformHandleRaw = (void*)info.info.cocoa.window;
-#endif
-    }
-}
-
-static void ImGui_ImplSDL2_DestroyWindow(ImGuiViewport* viewport)
-{
-    if (ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData)
-    {
-        if (vd->GLContext && vd->WindowOwned)
-            SDL_GL_DeleteContext(vd->GLContext);
-        if (vd->Window && vd->WindowOwned)
-            SDL_DestroyWindow(vd->Window);
-        vd->GLContext = nullptr;
-        vd->Window = nullptr;
-        IM_DELETE(vd);
-    }
-    viewport->PlatformUserData = viewport->PlatformHandle = nullptr;
-}
-
-static void ImGui_ImplSDL2_ShowWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-#if defined(_WIN32) && !(defined(WINAPI_FAMILY) && ((defined(WINAPI_FAMILY_APP) && WINAPI_FAMILY == WINAPI_FAMILY_APP) || (defined(WINAPI_FAMILY_GAMES) && WINAPI_FAMILY == WINAPI_FAMILY_GAMES)))
-    HWND hwnd = (HWND)viewport->PlatformHandleRaw;
-
-    // SDL hack: Hide icon from task bar
-    // Note: SDL 2.0.6+ has a SDL_WINDOW_SKIP_TASKBAR flag which is supported under Windows but the way it create the window breaks our seamless transition.
-    if (viewport->Flags & ImGuiViewportFlags_NoTaskBarIcon)
-    {
-        LONG ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE);
-        ex_style &= ~WS_EX_APPWINDOW;
-        ex_style |= WS_EX_TOOLWINDOW;
-        ::SetWindowLong(hwnd, GWL_EXSTYLE, ex_style);
-    }
-#endif
-
-#if SDL_HAS_SHOW_WINDOW_ACTIVATION_HINT
-    SDL_SetHint(SDL_HINT_WINDOW_NO_ACTIVATION_WHEN_SHOWN, (viewport->Flags & ImGuiViewportFlags_NoFocusOnAppearing) ? "1" : "0");
-#elif defined(_WIN32)
-    // SDL hack: SDL always activate/focus windows :/
-    if (viewport->Flags & ImGuiViewportFlags_NoFocusOnAppearing)
-    {
-        ::ShowWindow(hwnd, SW_SHOWNA);
-        return;
-    }
-#endif
-    SDL_ShowWindow(vd->Window);
-}
-
-static ImVec2 ImGui_ImplSDL2_GetWindowPos(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    int x = 0, y = 0;
-    SDL_GetWindowPosition(vd->Window, &x, &y);
-    return ImVec2((float)x, (float)y);
-}
-
-static void ImGui_ImplSDL2_SetWindowPos(ImGuiViewport* viewport, ImVec2 pos)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    SDL_SetWindowPosition(vd->Window, (int)pos.x, (int)pos.y);
-}
-
-static ImVec2 ImGui_ImplSDL2_GetWindowSize(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    int w = 0, h = 0;
-    SDL_GetWindowSize(vd->Window, &w, &h);
-    return ImVec2((float)w, (float)h);
-}
-
-static void ImGui_ImplSDL2_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    SDL_SetWindowSize(vd->Window, (int)size.x, (int)size.y);
-}
-
-static ImVec2 ImGui_ImplSDL2_GetWindowFramebufferScale(ImGuiViewport* viewport)
-{
-    // FIXME: SDL_Renderer does not support multi-viewport.
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    ImVec2 framebuffer_scale;
-    ImGui_ImplSDL2_GetWindowSizeAndFramebufferScale(vd->Window, nullptr, nullptr, &framebuffer_scale);
-    return framebuffer_scale;
-}
-
-static void ImGui_ImplSDL2_SetWindowTitle(ImGuiViewport* viewport, const char* title)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    SDL_SetWindowTitle(vd->Window, title);
-}
-
-#if SDL_HAS_WINDOW_ALPHA
-static void ImGui_ImplSDL2_SetWindowAlpha(ImGuiViewport* viewport, float alpha)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    SDL_SetWindowOpacity(vd->Window, alpha);
-}
-#endif
-
-static void ImGui_ImplSDL2_SetWindowFocus(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    SDL_RaiseWindow(vd->Window);
-}
-
-static bool ImGui_ImplSDL2_GetWindowFocus(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    return (SDL_GetWindowFlags(vd->Window) & SDL_WINDOW_INPUT_FOCUS) != 0;
-}
-
-static bool ImGui_ImplSDL2_GetWindowMinimized(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    return (SDL_GetWindowFlags(vd->Window) & SDL_WINDOW_MINIMIZED) != 0;
-}
-
-static void ImGui_ImplSDL2_RenderWindow(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    if (vd->GLContext)
-        SDL_GL_MakeCurrent(vd->Window, vd->GLContext);
-}
-
-static void ImGui_ImplSDL2_SwapBuffers(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    if (vd->GLContext)
-    {
-        SDL_GL_MakeCurrent(vd->Window, vd->GLContext);
-        SDL_GL_SwapWindow(vd->Window);
-    }
-}
-
-// Vulkan support (the Vulkan renderer needs to call a platform-side support function to create the surface)
-// SDL is graceful enough to _not_ need <vulkan/vulkan.h> so we can safely include this.
-#if SDL_HAS_VULKAN
-#include <SDL_vulkan.h>
-static int ImGui_ImplSDL2_CreateVkSurface(ImGuiViewport* viewport, ImU64 vk_instance, const void* vk_allocator, ImU64* out_vk_surface)
-{
-    ImGui_ImplSDL2_ViewportData* vd = (ImGui_ImplSDL2_ViewportData*)viewport->PlatformUserData;
-    (void)vk_allocator;
-    SDL_bool ret = SDL_Vulkan_CreateSurface(vd->Window, (VkInstance)vk_instance, (VkSurfaceKHR*)out_vk_surface);
-    return ret ? 0 : 1; // ret ? VK_SUCCESS : VK_NOT_READY
-}
-#endif // SDL_HAS_VULKAN
-
-static void ImGui_ImplSDL2_InitMultiViewportSupport(SDL_Window* window, void* sdl_gl_context)
-{
-    // Register platform interface (will be coupled with a renderer interface)
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Platform_CreateWindow = ImGui_ImplSDL2_CreateWindow;
-    platform_io.Platform_DestroyWindow = ImGui_ImplSDL2_DestroyWindow;
-    platform_io.Platform_ShowWindow = ImGui_ImplSDL2_ShowWindow;
-    platform_io.Platform_SetWindowPos = ImGui_ImplSDL2_SetWindowPos;
-    platform_io.Platform_GetWindowPos = ImGui_ImplSDL2_GetWindowPos;
-    platform_io.Platform_SetWindowSize = ImGui_ImplSDL2_SetWindowSize;
-    platform_io.Platform_GetWindowSize = ImGui_ImplSDL2_GetWindowSize;
-    platform_io.Platform_GetWindowFramebufferScale = ImGui_ImplSDL2_GetWindowFramebufferScale;
-    platform_io.Platform_SetWindowFocus = ImGui_ImplSDL2_SetWindowFocus;
-    platform_io.Platform_GetWindowFocus = ImGui_ImplSDL2_GetWindowFocus;
-    platform_io.Platform_GetWindowMinimized = ImGui_ImplSDL2_GetWindowMinimized;
-    platform_io.Platform_SetWindowTitle = ImGui_ImplSDL2_SetWindowTitle;
-    platform_io.Platform_RenderWindow = ImGui_ImplSDL2_RenderWindow;
-    platform_io.Platform_SwapBuffers = ImGui_ImplSDL2_SwapBuffers;
-#if SDL_HAS_WINDOW_ALPHA
-    platform_io.Platform_SetWindowAlpha = ImGui_ImplSDL2_SetWindowAlpha;
-#endif
-#if SDL_HAS_VULKAN
-    platform_io.Platform_CreateVkSurface = ImGui_ImplSDL2_CreateVkSurface;
-#endif
-
-    // Register main window handle (which is owned by the main application, not by us)
-    // This is mostly for simplicity and consistency, so that our code (e.g. mouse handling etc.) can use same logic for main and secondary viewports.
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    ImGui_ImplSDL2_ViewportData* vd = IM_NEW(ImGui_ImplSDL2_ViewportData)();
-    vd->Window = window;
-    vd->WindowID = SDL_GetWindowID(window);
-    vd->WindowOwned = false;
-    vd->GLContext = sdl_gl_context;
-    main_viewport->PlatformUserData = vd;
-    main_viewport->PlatformHandle = (void*)(intptr_t)vd->WindowID;
-}
-
-static void ImGui_ImplSDL2_ShutdownMultiViewportSupport()
-{
-    ImGui::DestroyPlatformWindows();
-}
-
 //-----------------------------------------------------------------------------
 
 #if defined(__clang__)

backends/imgui_impl_sdl2.h

@@ -9,10 +9,6 @@
 //  [X] Platform: Gamepad support.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
 //  [X] Platform: Basic IME support. App needs to call 'SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");' before SDL_CreateWindow()!.
-//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
-// Missing features or Issues:
-//  [ ] Platform: Multi-viewport: Minimized windows seems to break mouse wheel events (at least under Windows).
-//  [ ] Platform: Multi-viewport: Missing ImGuiBackendFlags_HasParentViewport support. The viewport->ParentViewportID field is ignored, and therefore io.ConfigViewportsNoDefaultParent has no effect either.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_sdl3.cpp

@@ -8,10 +8,7 @@
 //  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy SDL_SCANCODE_* values are obsolete since 1.87 and not supported since 1.91.5]
 //  [X] Platform: Gamepad support.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
-//  [x] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable' -> the OS animation effect when window gets created/destroyed is problematic. SDL2 backend doesn't have issue.
-// Missing features or Issues:
-//  [ ] Platform: Multi-viewport: Minimized windows seems to break mouse wheel events (at least under Windows).
-//  [x] Platform: IME support. Position somehow broken in SDL3 + app needs to call 'SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");' before SDL_CreateWindow()!.
+//  [X] Platform: IME support.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -23,9 +20,6 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
-//  2026-03-25: [Docking] Use SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED (SDL 3.4.0+) when available to avoid refreshing monitor work area every frame on Windows. (#8415)
-//  2026-03-09: [Docking] Fixed an issue dated 2025/04/09 (1.92 WIP) where a refactor+merge caused ImGuiBackendFlags_HasMouseHoveredViewport to never be set, causing foreign windows to be ignored when deciding of hovered viewport. (#9284)
 //  2026-02-13: Inputs: systems other than X11 are back to starting mouse capture on mouse down (reverts 2025-02-26 change). Only X11 requires waiting for a drag by default (not ideal, but a better default for X11 users). Added ImGui_ImplSDL3_SetMouseCaptureMode() for X11 debugger users. (#3650, #6410, #9235)
 //  2026-01-15: Changed GetClipboardText() handler to return nullptr on error aka clipboard contents is not text. Consistent with other backends. (#9168)
 //  2025-11-05: Fixed an issue with missing characters events when an already active text field changes viewports. (#9054)
@@ -34,23 +28,17 @@
 //  2025-09-18: Call platform_io.ClearPlatformHandlers() on shutdown.
 //  2025-09-15: Use SDL_GetWindowDisplayScale() on Mac to output DisplayFrameBufferScale. The function is more reliable during resolution changes e.g. going fullscreen. (#8703, #4414)
 //  2025-06-27: IME: avoid calling SDL_StartTextInput() again if already active. (#8727)
-//  2025-05-15: [Docking] Add Platform_GetWindowFramebufferScale() handler, to allow varying Retina display density on multiple monitors.
-//  2025-05-06: [Docking] macOS: fixed secondary viewports not appearing on other monitors before of parenting.
-//  2025-04-09: [Docking] Revert update monitors and work areas information every frame. Only do it on Windows. (#8415, #8558)
 //  2025-04-22: IME: honor ImGuiPlatformImeData->WantTextInput as an alternative way to call SDL_StartTextInput(), without IME being necessarily visible.
 //  2025-04-09: Don't attempt to call SDL_CaptureMouse() on drivers where we don't call SDL_GetGlobalMouseState(). (#8561)
 //  2025-03-30: Update for SDL3 api changes: Revert SDL_GetClipboardText() memory ownership change. (#8530, #7801)
 //  2025-03-21: Fill gamepad inputs and set ImGuiBackendFlags_HasGamepad regardless of ImGuiConfigFlags_NavEnableGamepad being set.
 //  2025-03-10: When dealing with OEM keys, use scancodes instead of translated keycodes to choose ImGuiKey values. (#7136, #7201, #7206, #7306, #7670, #7672, #8468)
 //  2025-02-26: Only start SDL_CaptureMouse() when mouse is being dragged, to mitigate issues with e.g. Linux debuggers not claiming capture back. (#6410, #3650)
-//  2025-02-25: [Docking] Revert to use SDL_GetDisplayBounds() for WorkPos/WorkRect if SDL_GetDisplayUsableBounds() failed.
 //  2025-02-24: Avoid calling SDL_GetGlobalMouseState() when mouse is in relative mode.
-//  2025-02-21: [Docking] Update monitors and work areas information every frame, as the later may change regardless of monitor changes. (#8415)
 //  2025-02-18: Added ImGuiMouseCursor_Wait and ImGuiMouseCursor_Progress mouse cursor support.
 //  2025-02-10: Using SDL_OpenURL() in platform_io.Platform_OpenInShellFn handler.
 //  2025-01-20: Made ImGui_ImplSDL3_SetGamepadMode(ImGui_ImplSDL3_GamepadMode_Manual) accept an empty array.
 //  2024-10-24: Emscripten: SDL_EVENT_MOUSE_WHEEL event doesn't require dividing by 100.0f on Emscripten.
-//  2024-09-11: (Docking) Added support for viewport->ParentViewportId field to support parenting at OS level. (#7973)
 //  2024-09-03: Update for SDL3 api changes: SDL_GetGamepads() memory ownership revert. (#7918, #7898, #7807)
 //  2024-08-22: moved some OS/backend related function pointers from ImGuiIO to ImGuiPlatformIO:
 //               - io.GetClipboardTextFn    -> platform_io.Platform_GetClipboardTextFn
@@ -106,7 +94,6 @@
 #else
 #define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE    0
 #endif
-#define SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED     SDL_VERSION_ATLEAST(3,4,0)
 
 // FIXME-LEGACY: remove when SDL 3.1.3 preview is released.
 #ifndef SDLK_APOSTROPHE
@@ -125,8 +112,6 @@ struct ImGui_ImplSDL3_Data
     Uint64                  Time;
     char*                   ClipboardTextData;
     char                    BackendPlatformName[48];
-    bool                    UseVulkan;
-    bool                    WantUpdateMonitors;
 
     // IME handling
     SDL_Window*             ImeWindow;
@@ -140,13 +125,12 @@ struct ImGui_ImplSDL3_Data
     SDL_Cursor*             MouseLastCursor;
     int                     MousePendingLeaveFrame;
     bool                    MouseCanUseGlobalState;
-    bool                    MouseCanReportHoveredViewport;  // This is hard to use/unreliable on SDL so we'll set ImGuiBackendFlags_HasMouseHoveredViewport dynamically based on state.
     ImGui_ImplSDL3_MouseCaptureMode MouseCaptureMode;
 
     // Gamepad handling
-    ImVector<SDL_Gamepad*>  Gamepads;
+    ImVector<SDL_Gamepad*>      Gamepads;
     ImGui_ImplSDL3_GamepadMode  GamepadMode;
-    bool                    WantUpdateGamepadsList;
+    bool                        WantUpdateGamepadsList;
 
     ImGui_ImplSDL3_Data()   { memset((void*)this, 0, sizeof(*this)); }
 };
@@ -162,9 +146,6 @@ static ImGui_ImplSDL3_Data* ImGui_ImplSDL3_GetBackendData()
 
 // Forward Declarations
 static void ImGui_ImplSDL3_UpdateIme();
-static void ImGui_ImplSDL3_UpdateMonitors();
-static void ImGui_ImplSDL3_InitMultiViewportSupport(SDL_Window* window, void* sdl_gl_context);
-static void ImGui_ImplSDL3_ShutdownMultiViewportSupport();
 
 // Functions
 static const char* ImGui_ImplSDL3_GetClipboardText(ImGuiContext*)
@@ -186,7 +167,8 @@ static void ImGui_ImplSDL3_SetClipboardText(ImGuiContext*, const char* text)
 
 static ImGuiViewport* ImGui_ImplSDL3_GetViewportForWindowID(SDL_WindowID window_id)
 {
-    return ImGui::FindViewportByPlatformHandle((void*)(intptr_t)window_id);
+    ImGui_ImplSDL3_Data* bd = ImGui_ImplSDL3_GetBackendData();
+    return (window_id == bd->WindowID) ? ImGui::GetMainViewport() : nullptr;
 }
 
 static void ImGui_ImplSDL3_PlatformSetImeData(ImGuiContext*, ImGuiViewport*, ImGuiPlatformImeData* data)
@@ -217,12 +199,9 @@ static void ImGui_ImplSDL3_UpdateIme()
     bd->ImeDirty = false;
     if (data->WantVisible)
     {
-        ImVec2 viewport_pos;
-        if (ImGuiViewport* viewport = ImGui_ImplSDL3_GetViewportForWindowID(SDL_GetWindowID(window)))
-            viewport_pos = viewport->Pos;
         SDL_Rect r;
-        r.x = (int)(data->InputPos.x - viewport_pos.x);
-        r.y = (int)(data->InputPos.y - viewport_pos.y);
+        r.x = (int)data->InputPos.x;
+        r.y = (int)data->InputPos.y;
         r.w = 1;
         r.h = (int)data->InputLineHeight;
         SDL_SetTextInputArea(window, &r, 0);
@@ -411,13 +390,6 @@ bool ImGui_ImplSDL3_ProcessEvent(const SDL_Event* event)
             if (ImGui_ImplSDL3_GetViewportForWindowID(event->motion.windowID) == nullptr)
                 return false;
             ImVec2 mouse_pos((float)event->motion.x, (float)event->motion.y);
-            if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-            {
-                int window_x, window_y;
-                SDL_GetWindowPosition(SDL_GetWindowFromID(event->motion.windowID), &window_x, &window_y);
-                mouse_pos.x += window_x;
-                mouse_pos.y += window_y;
-            }
             io.AddMouseSourceEvent(event->motion.which == SDL_TOUCH_MOUSEID ? ImGuiMouseSource_TouchScreen : ImGuiMouseSource_Mouse);
             io.AddMousePosEvent(mouse_pos.x, mouse_pos.y);
             return true;
@@ -461,29 +433,16 @@ bool ImGui_ImplSDL3_ProcessEvent(const SDL_Event* event)
         case SDL_EVENT_KEY_DOWN:
         case SDL_EVENT_KEY_UP:
         {
-            ImGuiViewport* viewport = ImGui_ImplSDL3_GetViewportForWindowID(event->key.windowID);
-            if (viewport == nullptr)
+            if (ImGui_ImplSDL3_GetViewportForWindowID(event->key.windowID) == nullptr)
                 return false;
-            //IMGUI_DEBUG_LOG("SDL_EVENT_KEY_%s : key=0x%08X ('%s'), scancode=%d ('%s'), mod=%X, windowID=%d, viewport=%08X\n",
-            //    (event->type == SDL_EVENT_KEY_DOWN) ? "DOWN" : "UP  ", event->key.key, SDL_GetKeyName(event->key.key), event->key.scancode, SDL_GetScancodeName(event->key.scancode), event->key.mod, event->key.windowID, viewport ? viewport->ID : 0);
             ImGui_ImplSDL3_UpdateKeyModifiers((SDL_Keymod)event->key.mod);
+            //IMGUI_DEBUG_LOG("SDL_EVENT_KEY_%s : key=%d ('%s'), scancode=%d ('%s'), mod=%X\n",
+            //    (event->type == SDL_EVENT_KEY_DOWN) ? "DOWN" : "UP  ", event->key.key, SDL_GetKeyName(event->key.key), event->key.scancode, SDL_GetScancodeName(event->key.scancode), event->key.mod);
             ImGuiKey key = ImGui_ImplSDL3_KeyEventToImGuiKey(event->key.key, event->key.scancode);
             io.AddKeyEvent(key, (event->type == SDL_EVENT_KEY_DOWN));
             io.SetKeyEventNativeData(key, (int)event->key.key, (int)event->key.scancode, (int)event->key.scancode); // To support legacy indexing (<1.87 user code). Legacy backend uses SDLK_*** as indices to IsKeyXXX() functions.
             return true;
         }
-        case SDL_EVENT_DISPLAY_ORIENTATION:
-        case SDL_EVENT_DISPLAY_ADDED:
-        case SDL_EVENT_DISPLAY_REMOVED:
-        case SDL_EVENT_DISPLAY_MOVED:
-        case SDL_EVENT_DISPLAY_CONTENT_SCALE_CHANGED:
-#if SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED
-        case SDL_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED:
-#endif
-        {
-            bd->WantUpdateMonitors = true;
-            return true;
-        }
         case SDL_EVENT_WINDOW_MOUSE_ENTER:
         {
             if (ImGui_ImplSDL3_GetViewportForWindowID(event->window.windowID) == nullptr)
@@ -506,28 +465,11 @@ bool ImGui_ImplSDL3_ProcessEvent(const SDL_Event* event)
         case SDL_EVENT_WINDOW_FOCUS_GAINED:
         case SDL_EVENT_WINDOW_FOCUS_LOST:
         {
-            ImGuiViewport* viewport = ImGui_ImplSDL3_GetViewportForWindowID(event->window.windowID);
-            if (viewport == nullptr)
+            if (ImGui_ImplSDL3_GetViewportForWindowID(event->window.windowID) == nullptr)
                 return false;
-            //IMGUI_DEBUG_LOG("%s: windowId %d, viewport: %08X\n", (event->type == SDL_EVENT_WINDOW_FOCUS_GAINED) ? "SDL_EVENT_WINDOW_FOCUS_GAINED" : "SDL_WINDOWEVENT_FOCUS_LOST", event->window.windowID, viewport ? viewport->ID : 0);
             io.AddFocusEvent(event->type == SDL_EVENT_WINDOW_FOCUS_GAINED);
             return true;
         }
-        case SDL_EVENT_WINDOW_CLOSE_REQUESTED:
-        case SDL_EVENT_WINDOW_MOVED:
-        case SDL_EVENT_WINDOW_RESIZED:
-        {
-            ImGuiViewport* viewport = ImGui_ImplSDL3_GetViewportForWindowID(event->window.windowID);
-            if (viewport == NULL)
-                return false;
-            if (event->type == SDL_EVENT_WINDOW_CLOSE_REQUESTED)
-                viewport->PlatformRequestClose = true;
-            if (event->type == SDL_EVENT_WINDOW_MOVED)
-                viewport->PlatformRequestMove = true;
-            if (event->type == SDL_EVENT_WINDOW_RESIZED)
-                viewport->PlatformRequestResize = true;
-            return true;
-        }
         case SDL_EVENT_GAMEPAD_ADDED:
         case SDL_EVENT_GAMEPAD_REMOVED:
         {
@@ -569,8 +511,6 @@ static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, void
     io.BackendPlatformName = bd->BackendPlatformName;
     io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;           // We can honor GetMouseCursor() values (optional)
     io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos;            // We can honor io.WantSetMousePos requests (optional, rarely used)
-    // (ImGuiBackendFlags_PlatformHasViewports and ImGuiBackendFlags_HasParentViewport may be set just below)
-    // (ImGuiBackendFlags_HasMouseHoveredViewport is set dynamically in our _NewFrame function)
 
     bd->Window = window;
     bd->WindowID = SDL_GetWindowID(window);
@@ -590,19 +530,6 @@ static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, void
             bd->MouseCaptureMode = (strcmp(item, "x11") == 0) ? ImGui_ImplSDL3_MouseCaptureMode_EnabledAfterDrag : ImGui_ImplSDL3_MouseCaptureMode_Enabled;
         }
 #endif
-    if (bd->MouseCanUseGlobalState)
-    {
-        io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports;  // We can create multi-viewports on the Platform side (optional)
-        io.BackendFlags |= ImGuiBackendFlags_HasParentViewport;     // We can honor viewport->ParentViewportId by applying the corresponding parent/child relationship at platform level (optional)
-    }
-
-    // SDL on Linux/OSX doesn't report events for unfocused windows (see https://github.com/ocornut/imgui/issues/4960)
-    // We will use 'MouseCanReportHoveredViewport' to set 'ImGuiBackendFlags_HasMouseHoveredViewport' dynamically each frame.
-#ifndef __APPLE__
-    bd->MouseCanReportHoveredViewport = bd->MouseCanUseGlobalState;
-#else
-    bd->MouseCanReportHoveredViewport = false;
-#endif
 
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     platform_io.Platform_SetClipboardTextFn = ImGui_ImplSDL3_SetClipboardText;
@@ -610,9 +537,6 @@ static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, void
     platform_io.Platform_SetImeDataFn = ImGui_ImplSDL3_PlatformSetImeData;
     platform_io.Platform_OpenInShellFn = [](ImGuiContext*, const char* url) { return SDL_OpenURL(url); };
 
-    // Update monitor a first time during init
-    ImGui_ImplSDL3_UpdateMonitors();
-
     // Gamepad handling
     bd->GamepadMode = ImGui_ImplSDL3_GamepadMode_AutoFirst;
     bd->WantUpdateGamepadsList = true;
@@ -645,14 +569,6 @@ static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, void
     // From 2.0.22: Disable auto-capture, this is preventing drag and drop across multiple windows (see #5710)
     SDL_SetHint(SDL_HINT_MOUSE_AUTO_CAPTURE, "0");
 
-    // SDL 3.x : see https://github.com/libsdl-org/SDL/issues/6659
-    SDL_SetHint("SDL_BORDERLESS_WINDOWED_STYLE", "0");
-
-    // We need SDL_CaptureMouse(), SDL_GetGlobalMouseState() from SDL 2.0.4+ to support multiple viewports.
-    // We left the call to ImGui_ImplSDL3_InitPlatformInterface() outside of #ifdef to avoid unused-function warnings.
-    if (io.BackendFlags & ImGuiBackendFlags_PlatformHasViewports)
-        ImGui_ImplSDL3_InitMultiViewportSupport(window, sdl_gl_context);
-
     return true;
 }
 
@@ -664,11 +580,7 @@ bool ImGui_ImplSDL3_InitForOpenGL(SDL_Window* window, void* sdl_gl_context)
 
 bool ImGui_ImplSDL3_InitForVulkan(SDL_Window* window)
 {
-    if (!ImGui_ImplSDL3_Init(window, nullptr, nullptr))
-        return false;
-    ImGui_ImplSDL3_Data* bd = ImGui_ImplSDL3_GetBackendData();
-    bd->UseVulkan = true;
-    return true;
+    return ImGui_ImplSDL3_Init(window, nullptr, nullptr);
 }
 
 bool ImGui_ImplSDL3_InitForD3D(SDL_Window* window)
@@ -708,7 +620,6 @@ void ImGui_ImplSDL3_Shutdown()
     ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
-    ImGui_ImplSDL3_ShutdownMultiViewportSupport();
     if (bd->ClipboardTextData)
         SDL_free(bd->ClipboardTextData);
     for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
@@ -717,7 +628,7 @@ void ImGui_ImplSDL3_Shutdown()
 
     io.BackendPlatformName = nullptr;
     io.BackendPlatformUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasSetMousePos | ImGuiBackendFlags_HasGamepad | ImGuiBackendFlags_PlatformHasViewports | ImGuiBackendFlags_HasMouseHoveredViewport | ImGuiBackendFlags_HasParentViewport);
+    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasSetMousePos | ImGuiBackendFlags_HasGamepad);
     platform_io.ClearPlatformHandlers();
     IM_DELETE(bd);
 }
@@ -753,7 +664,7 @@ static void ImGui_ImplSDL3_UpdateMouseData()
     }
 
     SDL_Window* focused_window = SDL_GetKeyboardFocus();
-    const bool is_app_focused = (focused_window && (bd->Window == focused_window || ImGui_ImplSDL3_GetViewportForWindowID(SDL_GetWindowID(focused_window)) != NULL));
+    const bool is_app_focused = (bd->Window == focused_window);
 #else
     SDL_Window* focused_window = bd->Window;
     const bool is_app_focused = (SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_INPUT_FOCUS) != 0; // SDL 2.0.3 and non-windowed systems: single-viewport only
@@ -762,14 +673,7 @@ static void ImGui_ImplSDL3_UpdateMouseData()
     {
         // (Optional) Set OS mouse position from Dear ImGui if requested (rarely used, only when io.ConfigNavMoveSetMousePos is enabled by user)
         if (io.WantSetMousePos)
-        {
-#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE
-            if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-                SDL_WarpMouseGlobal(io.MousePos.x, io.MousePos.y);
-            else
-#endif
-                SDL_WarpMouseInWindow(bd->Window, io.MousePos.x, io.MousePos.y);
-        }
+            SDL_WarpMouseInWindow(bd->Window, io.MousePos.x, io.MousePos.y);
 
         // (Optional) Fallback to provide unclamped mouse position when focused but not hovered (SDL_EVENT_MOUSE_MOTION already provides this when hovered or captured)
         // Note that SDL_GetGlobalMouseState() is in theory slow on X11, but this only runs on rather specific cases. If a problem we may provide a way to opt-out this feature.
@@ -778,34 +682,15 @@ static void ImGui_ImplSDL3_UpdateMouseData()
         if (hovered_window == nullptr && bd->MouseCanUseGlobalState && bd->MouseButtonsDown == 0 && !is_relative_mouse_mode)
         {
             // Single-viewport mode: mouse position in client window coordinates (io.MousePos is (0,0) when the mouse is on the upper-left corner of the app window)
-            // Multi-viewport mode: mouse position in OS absolute coordinates (io.MousePos is (0,0) when the mouse is on the upper-left of the primary monitor)
             float mouse_x, mouse_y;
             int window_x, window_y;
             SDL_GetGlobalMouseState(&mouse_x, &mouse_y);
-            if (!(io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable))
-            {
-                SDL_GetWindowPosition(focused_window, &window_x, &window_y);
-                mouse_x -= window_x;
-                mouse_y -= window_y;
-            }
+            SDL_GetWindowPosition(focused_window, &window_x, &window_y);
+            mouse_x -= (float)window_x;
+            mouse_y -= (float)window_y;
             io.AddMousePosEvent(mouse_x, mouse_y);
         }
     }
-
-    // (Optional) When using multiple viewports: call io.AddMouseViewportEvent() with the viewport the OS mouse cursor is hovering.
-    // If ImGuiBackendFlags_HasMouseHoveredViewport is not set by the backend, Dear imGui will ignore this field and infer the information using its flawed heuristic.
-    // - [!] SDL backend does NOT correctly ignore viewports with the _NoInputs flag.
-    //       Some backend are not able to handle that correctly. If a backend report an hovered viewport that has the _NoInputs flag (e.g. when dragging a window
-    //       for docking, the viewport has the _NoInputs flag in order to allow us to find the viewport under), then Dear ImGui is forced to ignore the value reported
-    //       by the backend, and use its flawed heuristic to guess the viewport behind.
-    // - [X] SDL backend correctly reports this regardless of another viewport behind focused and dragged from (we need this to find a useful drag and drop target).
-    if (io.BackendFlags & ImGuiBackendFlags_HasMouseHoveredViewport)
-    {
-        ImGuiID mouse_viewport_id = 0;
-        if (ImGuiViewport* mouse_viewport = ImGui_ImplSDL3_GetViewportForWindowID(bd->MouseWindowID))
-            mouse_viewport_id = mouse_viewport->ID;
-        io.AddMouseViewportEvent(mouse_viewport_id);
-    }
 }
 
 static void ImGui_ImplSDL3_UpdateMouseCursor()
@@ -937,38 +822,6 @@ static void ImGui_ImplSDL3_UpdateGamepads()
     ImGui_ImplSDL3_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadRStickDown,  SDL_GAMEPAD_AXIS_RIGHTY, +thumb_dead_zone, +32767);
 }
 
-static void ImGui_ImplSDL3_UpdateMonitors()
-{
-    ImGui_ImplSDL3_Data* bd = ImGui_ImplSDL3_GetBackendData();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Monitors.resize(0);
-    bd->WantUpdateMonitors = false;
-
-    int display_count;
-    SDL_DisplayID* displays = SDL_GetDisplays(&display_count);
-    for (int n = 0; n < display_count; n++)
-    {
-        // Warning: the validity of monitor DPI information on Windows depends on the application DPI awareness settings, which generally needs to be set in the manifest or at runtime.
-        SDL_DisplayID display_id = displays[n];
-        ImGuiPlatformMonitor monitor;
-        SDL_Rect r;
-        SDL_GetDisplayBounds(display_id, &r);
-        monitor.MainPos = monitor.WorkPos = ImVec2((float)r.x, (float)r.y);
-        monitor.MainSize = monitor.WorkSize = ImVec2((float)r.w, (float)r.h);
-        if (SDL_GetDisplayUsableBounds(display_id, &r) && r.w > 0 && r.h > 0)
-        {
-            monitor.WorkPos = ImVec2((float)r.x, (float)r.y);
-            monitor.WorkSize = ImVec2((float)r.w, (float)r.h);
-        }
-        monitor.DpiScale = SDL_GetDisplayContentScale(display_id); // See https://wiki.libsdl.org/SDL3/README-highdpi for details.
-        monitor.PlatformHandle = (void*)(intptr_t)n;
-        if (monitor.DpiScale <= 0.0f)
-            continue; // Some accessibility applications are declaring virtual monitors with a DPI of 0, see #7902.
-        platform_io.Monitors.push_back(monitor);
-    }
-    SDL_free(displays);
-}
-
 static void ImGui_ImplSDL3_GetWindowSizeAndFramebufferScale(SDL_Window* window, ImVec2* out_size, ImVec2* out_framebuffer_scale)
 {
     int w, h;
@@ -1001,20 +854,13 @@ void ImGui_ImplSDL3_NewFrame()
     // Setup main viewport size (every frame to accommodate for window resizing)
     ImGui_ImplSDL3_GetWindowSizeAndFramebufferScale(bd->Window, &io.DisplaySize, &io.DisplayFramebufferScale);
 
-    // Update monitors
-#if defined(WIN32) && !SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED
-    bd->WantUpdateMonitors = true; // Keep polling under Windows to handle changes of work area when resizing task-bar (#8415)
-#endif
-    if (bd->WantUpdateMonitors)
-        ImGui_ImplSDL3_UpdateMonitors();
-
     // Setup time step (we could also use SDL_GetTicksNS() available since SDL3)
     // (Accept SDL_GetPerformanceCounter() not returning a monotonically increasing value. Happens in VMs and Emscripten, see #6189, #6114, #3644)
     static Uint64 frequency = SDL_GetPerformanceFrequency();
     Uint64 current_time = SDL_GetPerformanceCounter();
     if (current_time <= bd->Time)
         current_time = bd->Time + 1;
-    io.DeltaTime = bd->Time > 0 ? (float)((double)(current_time - bd->Time) / frequency) : (float)(1.0f / 60.0f);
+    io.DeltaTime = bd->Time > 0 ? (float)((double)(current_time - bd->Time) / (double)frequency) : (float)(1.0f / 60.0f);
     bd->Time = current_time;
 
     if (bd->MousePendingLeaveFrame && bd->MousePendingLeaveFrame >= ImGui::GetFrameCount() && bd->MouseButtonsDown == 0)
@@ -1024,13 +870,6 @@ void ImGui_ImplSDL3_NewFrame()
         io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
     }
 
-    // Our io.AddMouseViewportEvent() calls will only be valid when not capturing.
-    // Technically speaking testing for 'bd->MouseButtonsDown == 0' would be more rigorous, but testing for payload reduces noise and potential side-effects.
-    if (bd->MouseCanReportHoveredViewport && ImGui::GetDragDropPayload() == nullptr)
-        io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport;
-    else
-        io.BackendFlags &= ~ImGuiBackendFlags_HasMouseHoveredViewport;
-
     ImGui_ImplSDL3_UpdateMouseData();
     ImGui_ImplSDL3_UpdateMouseCursor();
     ImGui_ImplSDL3_UpdateIme();
@@ -1039,272 +878,6 @@ void ImGui_ImplSDL3_NewFrame()
     ImGui_ImplSDL3_UpdateGamepads();
 }
 
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-// Helper structure we store in the void* PlatformUserData field of each ImGuiViewport to easily retrieve our backend data.
-struct ImGui_ImplSDL3_ViewportData
-{
-    SDL_Window*     Window;
-    SDL_Window*     ParentWindow;
-    Uint32          WindowID;       // Stored in ImGuiViewport::PlatformHandle. Use SDL_GetWindowFromID() to get SDL_Window* from Uint32 WindowID.
-    bool            WindowOwned;
-    SDL_GLContext   GLContext;
-
-    ImGui_ImplSDL3_ViewportData()   { Window = ParentWindow = nullptr; WindowID = 0; WindowOwned = false; GLContext = nullptr; }
-    ~ImGui_ImplSDL3_ViewportData()  { IM_ASSERT(Window == nullptr && GLContext == nullptr); }
-};
-
-static SDL_Window* ImGui_ImplSDL3_GetSDLWindowFromViewport(ImGuiViewport* viewport)
-{
-    if (viewport != nullptr)
-    {
-        SDL_WindowID window_id = (SDL_WindowID)(intptr_t)viewport->PlatformHandle;
-        return SDL_GetWindowFromID(window_id);
-    }
-    return nullptr;
-}
-
-static void ImGui_ImplSDL3_CreateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL3_Data* bd = ImGui_ImplSDL3_GetBackendData();
-    ImGui_ImplSDL3_ViewportData* vd = IM_NEW(ImGui_ImplSDL3_ViewportData)();
-    viewport->PlatformUserData = vd;
-
-    vd->ParentWindow = ImGui_ImplSDL3_GetSDLWindowFromViewport(viewport->ParentViewport);
-
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    ImGui_ImplSDL3_ViewportData* main_viewport_data = (ImGui_ImplSDL3_ViewportData*)main_viewport->PlatformUserData;
-
-    // Share GL resources with main context
-    bool use_opengl = (main_viewport_data->GLContext != nullptr);
-    SDL_GLContext backup_context = nullptr;
-    if (use_opengl)
-    {
-        backup_context = SDL_GL_GetCurrentContext();
-        SDL_GL_SetAttribute(SDL_GL_SHARE_WITH_CURRENT_CONTEXT, 1);
-        SDL_GL_MakeCurrent(main_viewport_data->Window, main_viewport_data->GLContext);
-    }
-
-    SDL_WindowFlags sdl_flags = 0;
-    sdl_flags |= SDL_WINDOW_HIDDEN;
-    sdl_flags |= use_opengl ? SDL_WINDOW_OPENGL : (bd->UseVulkan ? SDL_WINDOW_VULKAN : 0);
-    sdl_flags |= SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_HIGH_PIXEL_DENSITY;
-    sdl_flags |= (viewport->Flags & ImGuiViewportFlags_NoDecoration) ? SDL_WINDOW_BORDERLESS : 0;
-    sdl_flags |= (viewport->Flags & ImGuiViewportFlags_NoDecoration) ? 0 : SDL_WINDOW_RESIZABLE;
-    sdl_flags |= (viewport->Flags & ImGuiViewportFlags_NoTaskBarIcon) ? SDL_WINDOW_UTILITY : 0;
-    sdl_flags |= (viewport->Flags & ImGuiViewportFlags_TopMost) ? SDL_WINDOW_ALWAYS_ON_TOP : 0;
-    vd->Window = SDL_CreateWindow("No Title Yet", (int)viewport->Size.x, (int)viewport->Size.y, sdl_flags);
-#ifndef __APPLE__ // On Mac, SDL3 Parenting appears to prevent viewport from appearing in another monitor
-    SDL_SetWindowParent(vd->Window, vd->ParentWindow);
-#endif
-    SDL_SetWindowPosition(vd->Window, (int)viewport->Pos.x, (int)viewport->Pos.y);
-    vd->WindowOwned = true;
-    if (use_opengl)
-    {
-        vd->GLContext = SDL_GL_CreateContext(vd->Window);
-        SDL_GL_SetSwapInterval(0);
-    }
-    if (use_opengl && backup_context)
-        SDL_GL_MakeCurrent(vd->Window, backup_context);
-
-    ImGui_ImplSDL3_SetupPlatformHandles(viewport, vd->Window);
-}
-
-static void ImGui_ImplSDL3_DestroyWindow(ImGuiViewport* viewport)
-{
-    if (ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData)
-    {
-        if (vd->GLContext && vd->WindowOwned)
-            SDL_GL_DestroyContext(vd->GLContext);
-        if (vd->Window && vd->WindowOwned)
-            SDL_DestroyWindow(vd->Window);
-        vd->GLContext = nullptr;
-        vd->Window = nullptr;
-        IM_DELETE(vd);
-    }
-    viewport->PlatformUserData = viewport->PlatformHandle = nullptr;
-}
-
-static void ImGui_ImplSDL3_ShowWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-#if defined(_WIN32) && !(defined(WINAPI_FAMILY) && ((defined(WINAPI_FAMILY_APP) && WINAPI_FAMILY == WINAPI_FAMILY_APP) || (defined(WINAPI_FAMILY_GAMES) && WINAPI_FAMILY == WINAPI_FAMILY_GAMES)))
-    HWND hwnd = (HWND)viewport->PlatformHandleRaw;
-
-    // SDL hack: Show icon in task bar (#7989)
-    // Note: SDL_WINDOW_UTILITY can be used to control task bar visibility, but on Windows, it does not affect child windows.
-    if (!(viewport->Flags & ImGuiViewportFlags_NoTaskBarIcon))
-    {
-        LONG ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE);
-        ex_style |= WS_EX_APPWINDOW;
-        ex_style &= ~WS_EX_TOOLWINDOW;
-        ::ShowWindow(hwnd, SW_HIDE);
-        ::SetWindowLong(hwnd, GWL_EXSTYLE, ex_style);
-    }
-#endif
-
-#ifdef __APPLE__
-    SDL_SetHint(SDL_HINT_WINDOW_ACTIVATE_WHEN_SHOWN, "1"); // Otherwise new window appear under
-#else
-    SDL_SetHint(SDL_HINT_WINDOW_ACTIVATE_WHEN_SHOWN, (viewport->Flags & ImGuiViewportFlags_NoFocusOnAppearing) ? "0" : "1");
-#endif
-    SDL_ShowWindow(vd->Window);
-}
-
-static void ImGui_ImplSDL3_UpdateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    IM_UNUSED(vd);
-
-#ifndef __APPLE__ // On Mac, SDL3 Parenting appears to prevent viewport from appearing in another monitor
-    // Update SDL3 parent if it changed _after_ creation.
-    // This is for advanced apps that are manipulating ParentViewportID manually.
-    SDL_Window* new_parent = ImGui_ImplSDL3_GetSDLWindowFromViewport(viewport->ParentViewport);
-    if (new_parent != vd->ParentWindow)
-    {
-        vd->ParentWindow = new_parent;
-        SDL_SetWindowParent(vd->Window, vd->ParentWindow);
-    }
-#endif
-}
-
-static ImVec2 ImGui_ImplSDL3_GetWindowPos(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    int x = 0, y = 0;
-    SDL_GetWindowPosition(vd->Window, &x, &y);
-    return ImVec2((float)x, (float)y);
-}
-
-static void ImGui_ImplSDL3_SetWindowPos(ImGuiViewport* viewport, ImVec2 pos)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    SDL_SetWindowPosition(vd->Window, (int)pos.x, (int)pos.y);
-}
-
-static ImVec2 ImGui_ImplSDL3_GetWindowSize(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    int w = 0, h = 0;
-    SDL_GetWindowSize(vd->Window, &w, &h);
-    return ImVec2((float)w, (float)h);
-}
-
-static void ImGui_ImplSDL3_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    SDL_SetWindowSize(vd->Window, (int)size.x, (int)size.y);
-}
-
-static ImVec2 ImGui_ImplSDL3_GetWindowFramebufferScale(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    ImVec2 framebuffer_scale;
-    ImGui_ImplSDL3_GetWindowSizeAndFramebufferScale(vd->Window, nullptr, &framebuffer_scale);
-    return framebuffer_scale;
-}
-
-static void ImGui_ImplSDL3_SetWindowTitle(ImGuiViewport* viewport, const char* title)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    SDL_SetWindowTitle(vd->Window, title);
-}
-
-static void ImGui_ImplSDL3_SetWindowAlpha(ImGuiViewport* viewport, float alpha)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    SDL_SetWindowOpacity(vd->Window, alpha);
-}
-
-static void ImGui_ImplSDL3_SetWindowFocus(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    SDL_RaiseWindow(vd->Window);
-}
-
-static bool ImGui_ImplSDL3_GetWindowFocus(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    return (SDL_GetWindowFlags(vd->Window) & SDL_WINDOW_INPUT_FOCUS) != 0;
-}
-
-static bool ImGui_ImplSDL3_GetWindowMinimized(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    return (SDL_GetWindowFlags(vd->Window) & SDL_WINDOW_MINIMIZED) != 0;
-}
-
-static void ImGui_ImplSDL3_RenderWindow(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    if (vd->GLContext)
-        SDL_GL_MakeCurrent(vd->Window, vd->GLContext);
-}
-
-static void ImGui_ImplSDL3_SwapBuffers(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    if (vd->GLContext)
-    {
-        SDL_GL_MakeCurrent(vd->Window, vd->GLContext);
-        SDL_GL_SwapWindow(vd->Window);
-    }
-}
-
-// Vulkan support (the Vulkan renderer needs to call a platform-side support function to create the surface)
-// SDL is graceful enough to _not_ need <vulkan/vulkan.h> so we can safely include this.
-#include <SDL3/SDL_vulkan.h>
-static int ImGui_ImplSDL3_CreateVkSurface(ImGuiViewport* viewport, ImU64 vk_instance, const void* vk_allocator, ImU64* out_vk_surface)
-{
-    ImGui_ImplSDL3_ViewportData* vd = (ImGui_ImplSDL3_ViewportData*)viewport->PlatformUserData;
-    (void)vk_allocator;
-    bool ret = SDL_Vulkan_CreateSurface(vd->Window, (VkInstance)vk_instance, (const VkAllocationCallbacks*)vk_allocator, (VkSurfaceKHR*)out_vk_surface);
-    return ret ? 0 : 1; // ret ? VK_SUCCESS : VK_NOT_READY
-}
-
-static void ImGui_ImplSDL3_InitMultiViewportSupport(SDL_Window* window, void* sdl_gl_context)
-{
-    // Register platform interface (will be coupled with a renderer interface)
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Platform_CreateWindow = ImGui_ImplSDL3_CreateWindow;
-    platform_io.Platform_DestroyWindow = ImGui_ImplSDL3_DestroyWindow;
-    platform_io.Platform_ShowWindow = ImGui_ImplSDL3_ShowWindow;
-    platform_io.Platform_UpdateWindow = ImGui_ImplSDL3_UpdateWindow;
-    platform_io.Platform_SetWindowPos = ImGui_ImplSDL3_SetWindowPos;
-    platform_io.Platform_GetWindowPos = ImGui_ImplSDL3_GetWindowPos;
-    platform_io.Platform_SetWindowSize = ImGui_ImplSDL3_SetWindowSize;
-    platform_io.Platform_GetWindowSize = ImGui_ImplSDL3_GetWindowSize;
-    platform_io.Platform_GetWindowFramebufferScale = ImGui_ImplSDL3_GetWindowFramebufferScale;
-    platform_io.Platform_SetWindowFocus = ImGui_ImplSDL3_SetWindowFocus;
-    platform_io.Platform_GetWindowFocus = ImGui_ImplSDL3_GetWindowFocus;
-    platform_io.Platform_GetWindowMinimized = ImGui_ImplSDL3_GetWindowMinimized;
-    platform_io.Platform_SetWindowTitle = ImGui_ImplSDL3_SetWindowTitle;
-    platform_io.Platform_RenderWindow = ImGui_ImplSDL3_RenderWindow;
-    platform_io.Platform_SwapBuffers = ImGui_ImplSDL3_SwapBuffers;
-    platform_io.Platform_SetWindowAlpha = ImGui_ImplSDL3_SetWindowAlpha;
-    platform_io.Platform_CreateVkSurface = ImGui_ImplSDL3_CreateVkSurface;
-
-    // Register main window handle (which is owned by the main application, not by us)
-    // This is mostly for simplicity and consistency, so that our code (e.g. mouse handling etc.) can use same logic for main and secondary viewports.
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    ImGui_ImplSDL3_ViewportData* vd = IM_NEW(ImGui_ImplSDL3_ViewportData)();
-    vd->Window = window;
-    vd->WindowID = SDL_GetWindowID(window);
-    vd->WindowOwned = false;
-    vd->GLContext = (SDL_GLContext)sdl_gl_context;
-    main_viewport->PlatformUserData = vd;
-    main_viewport->PlatformHandle = (void*)(intptr_t)vd->WindowID;
-}
-
-static void ImGui_ImplSDL3_ShutdownMultiViewportSupport()
-{
-    ImGui::DestroyPlatformWindows();
-}
-
 //-----------------------------------------------------------------------------
 
 #if defined(__clang__)

backends/imgui_impl_sdl3.h

@@ -8,10 +8,7 @@
 //  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy SDL_SCANCODE_* values are obsolete since 1.87 and not supported since 1.91.5]
 //  [X] Platform: Gamepad support.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
-//  [x] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable' -> the OS animation effect when window gets created/destroyed is problematic. SDL2 backend doesn't have issue.
-// Missing features or Issues:
-//  [ ] Platform: Multi-viewport: Minimized windows seems to break mouse wheel events (at least under Windows).
-//  [x] Platform: IME support. Position somehow broken in SDL3 + app needs to call 'SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");' before SDL_CreateWindow()!.
+//  [X] Platform: IME support.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_sdlgpu3.cpp

@@ -5,7 +5,6 @@
 //  [X] Renderer: User texture binding. Use 'SDL_GPUTexture*' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef! **IMPORTANT** Before 2025/08/08, ImTextureID was a reference to a SDL_GPUTextureSamplerBinding struct.
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // The aim of imgui_impl_sdlgpu3.h/.cpp is to be usable in your engine without any modification.
 // IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/
@@ -23,7 +22,7 @@
 //   Calling the function is MANDATORY, otherwise the ImGui will not upload neither the vertex nor the index buffer for the GPU. See imgui_impl_sdlgpu3.cpp for more info.
 
 // CHANGELOG
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. Obsoleting samplers from ImGui_ImplSDLGPU3_RenderState. (#9378)
 //  2026-03-19: Fixed issue in ImGui_ImplSDLGPU3_DestroyTexture() if ImTextureID_Invalid is defined to be != 0, which became the default since 2026-03-12. (#9295, #9310)
 //  2026-02-25: Removed unnecessary call to SDL_WaitForGPUIdle when releasing vertex/index buffers. (#9262)
 //  2025-11-26: macOS version can use MSL shaders in order to support macOS 10.14+ (vs Metallib shaders requiring macOS 14+). Requires calling SDL_CreateGPUDevice() with SDL_GPU_SHADERFORMAT_MSL.
@@ -61,6 +60,10 @@ struct ImGui_ImplSDLGPU3_Data
 {
     ImGui_ImplSDLGPU3_InitInfo   InitInfo;
 
+    // Render state
+    ImGui_ImplSDLGPU3_RenderState*  RenderState         = nullptr; // == ImGui::GetPlatformIO().Renderer_RenderState during rendering.
+    SDL_GPUSampler*                 CurrentSampler      = nullptr;
+
     // Graphics pipeline & shaders
     SDL_GPUShader*               VertexShader           = nullptr;
     SDL_GPUShader*               FragmentShader         = nullptr;
@@ -89,10 +92,10 @@ static ImGui_ImplSDLGPU3_Data* ImGui_ImplSDLGPU3_GetBackendData()
     return ImGui::GetCurrentContext() ? (ImGui_ImplSDLGPU3_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
-static void ImGui_ImplSDLGPU3_SetupRenderState(ImDrawData* draw_data, ImGui_ImplSDLGPU3_RenderState* render_state, SDL_GPUGraphicsPipeline* pipeline, SDL_GPUCommandBuffer* command_buffer, SDL_GPURenderPass* render_pass, ImGui_ImplSDLGPU3_FrameData* fd, uint32_t fb_width, uint32_t fb_height)
+static void ImGui_ImplSDLGPU3_SetupRenderState(ImDrawData* draw_data, SDL_GPUGraphicsPipeline* pipeline, SDL_GPUCommandBuffer* command_buffer, SDL_GPURenderPass* render_pass, ImGui_ImplSDLGPU3_FrameData* fd, uint32_t fb_width, uint32_t fb_height)
 {
     ImGui_ImplSDLGPU3_Data* bd = ImGui_ImplSDLGPU3_GetBackendData();
-    render_state->SamplerCurrent = bd->TexSamplerLinear;
+    bd->CurrentSampler = bd->TexSamplerLinear;
 
     // Bind graphics pipeline
     SDL_BindGPUGraphicsPipeline(render_pass, pipeline);
@@ -176,8 +179,8 @@ void ImGui_ImplSDLGPU3_PrepareDrawData(ImDrawData* draw_data, SDL_GPUCommandBuff
     ImGui_ImplSDLGPU3_InitInfo* v = &bd->InitInfo;
     ImGui_ImplSDLGPU3_FrameData* fd = &bd->MainWindowFrameData;
 
-    uint32_t vertex_size = draw_data->TotalVtxCount * sizeof(ImDrawVert);
-    uint32_t index_size  = draw_data->TotalIdxCount * sizeof(ImDrawIdx);
+    uint32_t vertex_size = (uint32_t)draw_data->TotalVtxCount * sizeof(ImDrawVert);
+    uint32_t index_size  = (uint32_t)draw_data->TotalIdxCount * sizeof(ImDrawIdx);
     if (fd->VertexBuffer == nullptr || fd->VertexBufferSize < vertex_size)
         CreateOrResizeBuffers(&fd->VertexBuffer, &fd->VertexTransferBuffer, &fd->VertexBufferSize, vertex_size, SDL_GPU_BUFFERUSAGE_VERTEX);
     if (fd->IndexBuffer == nullptr || fd->IndexBufferSize < index_size)
@@ -218,6 +221,11 @@ void ImGui_ImplSDLGPU3_PrepareDrawData(ImDrawData* draw_data, SDL_GPUCommandBuff
     SDL_EndGPUCopyPass(copy_pass);
 }
 
+// Draw callbacks
+static void ImGui_ImplSDLGPU3_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)    {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+static void ImGui_ImplSDLGPU3_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)    { ImGui_ImplSDLGPU3_Data* bd = ImGui_ImplSDLGPU3_GetBackendData(); bd->CurrentSampler = bd->TexSamplerLinear; }
+static void ImGui_ImplSDLGPU3_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)   { ImGui_ImplSDLGPU3_Data* bd = ImGui_ImplSDLGPU3_GetBackendData(); bd->CurrentSampler = bd->TexSamplerNearest; }
+
 void ImGui_ImplSDLGPU3_RenderDrawData(ImDrawData* draw_data, SDL_GPUCommandBuffer* command_buffer, SDL_GPURenderPass* render_pass, SDL_GPUGraphicsPipeline* pipeline)
 {
     // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
@@ -240,11 +248,9 @@ void ImGui_ImplSDLGPU3_RenderDrawData(ImDrawData* draw_data, SDL_GPUCommandBuffe
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     ImGui_ImplSDLGPU3_RenderState render_state;
     render_state.Device = bd->InitInfo.Device;
-    render_state.SamplerLinear = render_state.SamplerCurrent = bd->TexSamplerLinear;
-    render_state.SamplerNearest = bd->TexSamplerNearest;
-    platform_io.Renderer_RenderState = &render_state;
+    platform_io.Renderer_RenderState = bd->RenderState = &render_state;
 
-    ImGui_ImplSDLGPU3_SetupRenderState(draw_data, &render_state, pipeline, command_buffer, render_pass, fd, fb_width, fb_height);
+    ImGui_ImplSDLGPU3_SetupRenderState(draw_data, pipeline, command_buffer, render_pass, fd, fb_width, fb_height);
 
     // Render command lists
     // (Because we merged all buffers into a single one, we maintain our own offset into them)
@@ -258,9 +264,8 @@ void ImGui_ImplSDLGPU3_RenderDrawData(ImDrawData* draw_data, SDL_GPUCommandBuffe
             if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
-                    ImGui_ImplSDLGPU3_SetupRenderState(draw_data, &render_state, pipeline, command_buffer, render_pass, fd, fb_width, fb_height);
+                if (pcmd->UserCallback == ImGui_ImplSDLGPU3_DrawCallback_ResetRenderState)
+                    ImGui_ImplSDLGPU3_SetupRenderState(draw_data, pipeline, command_buffer, render_pass, fd, fb_width, fb_height);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
             }
@@ -273,8 +278,8 @@ void ImGui_ImplSDLGPU3_RenderDrawData(ImDrawData* draw_data, SDL_GPUCommandBuffe
                 // Clamp to viewport as SDL_SetGPUScissor() won't accept values that are off bounds
                 if (clip_min.x < 0.0f) { clip_min.x = 0.0f; }
                 if (clip_min.y < 0.0f) { clip_min.y = 0.0f; }
-                if (clip_max.x > fb_width) { clip_max.x = (float)fb_width; }
-                if (clip_max.y > fb_height) { clip_max.y = (float)fb_height; }
+                if (clip_max.x > (float)fb_width) { clip_max.x = (float)fb_width; }
+                if (clip_max.y > (float)fb_height) { clip_max.y = (float)fb_height; }
                 if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
@@ -289,7 +294,7 @@ void ImGui_ImplSDLGPU3_RenderDrawData(ImDrawData* draw_data, SDL_GPUCommandBuffe
                 // Bind DescriptorSet with font or user texture
                 SDL_GPUTextureSamplerBinding texture_sampler_binding;
                 texture_sampler_binding.texture = (SDL_GPUTexture*)(intptr_t)pcmd->GetTexID();
-                texture_sampler_binding.sampler = render_state.SamplerCurrent;
+                texture_sampler_binding.sampler = bd->CurrentSampler;
                 SDL_BindGPUFragmentSamplers(render_pass, 0, &texture_sampler_binding, 1);
 
                 // Draw
@@ -308,6 +313,8 @@ void ImGui_ImplSDLGPU3_RenderDrawData(ImDrawData* draw_data, SDL_GPUCommandBuffe
     // We perform a call to SDL_SetGPUScissor() to set back a full viewport which is likely to fix things for 99% users but technically this is not perfect. (See github #4644)
     SDL_Rect scissor_rect { 0, 0, fb_width, fb_height };
     SDL_SetGPUScissor(render_pass, &scissor_rect);
+
+    platform_io.Renderer_RenderState = bd->RenderState = nullptr;
 }
 
 static void ImGui_ImplSDLGPU3_DestroyTexture(ImTextureData* tex)
@@ -645,9 +652,6 @@ void ImGui_ImplSDLGPU3_DestroyDeviceObjects()
     if (bd->Pipeline)           { SDL_ReleaseGPUGraphicsPipeline(v->Device, bd->Pipeline); bd->Pipeline = nullptr; }
 }
 
-static void ImGui_ImplSDLGPU3_InitMultiViewportSupport();
-static void ImGui_ImplSDLGPU3_ShutdownMultiViewportSupport();
-
 bool ImGui_ImplSDLGPU3_Init(ImGui_ImplSDLGPU3_InitInfo* info)
 {
     ImGuiIO& io = ImGui::GetIO();
@@ -660,15 +664,17 @@ bool ImGui_ImplSDLGPU3_Init(ImGui_ImplSDLGPU3_InitInfo* info)
     io.BackendRendererName = "imgui_impl_sdlgpu3";
     io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
     io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
+
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplSDLGPU3_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplSDLGPU3_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplSDLGPU3_DrawCallback_SetSamplerNearest;
 
     IM_ASSERT(info->Device != nullptr);
     IM_ASSERT(info->ColorTargetFormat != SDL_GPU_TEXTUREFORMAT_INVALID);
 
     bd->InitInfo = *info;
 
-    ImGui_ImplSDLGPU3_InitMultiViewportSupport();
-
     return true;
 }
 
@@ -679,12 +685,11 @@ void ImGui_ImplSDLGPU3_Shutdown()
     ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
-    ImGui_ImplSDLGPU3_ShutdownMultiViewportSupport();
     ImGui_ImplSDLGPU3_DestroyDeviceObjects();
 
     io.BackendRendererName = nullptr;
     io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasViewports);
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
     platform_io.ClearRendererHandlers();
     IM_DELETE(bd);
 }
@@ -698,76 +703,4 @@ void ImGui_ImplSDLGPU3_NewFrame()
         ImGui_ImplSDLGPU3_CreateDeviceObjects();
 }
 
-//--------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-static void ImGui_ImplSDLGPU3_CreateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDLGPU3_Data* data = ImGui_ImplSDLGPU3_GetBackendData();
-    SDL_Window* window = SDL_GetWindowFromID((SDL_WindowID)(intptr_t)viewport->PlatformHandle);
-    SDL_ClaimWindowForGPUDevice(data->InitInfo.Device, window);
-    SDL_SetGPUSwapchainParameters(data->InitInfo.Device, window, data->InitInfo.SwapchainComposition, data->InitInfo.PresentMode);
-    viewport->RendererUserData = (void*)1;
-}
-
-static void ImGui_ImplSDLGPU3_RenderWindow(ImGuiViewport* viewport, void*)
-{
-    ImGui_ImplSDLGPU3_Data* data = ImGui_ImplSDLGPU3_GetBackendData();
-    SDL_Window* window = SDL_GetWindowFromID((SDL_WindowID)(intptr_t)viewport->PlatformHandle);
-
-    ImDrawData* draw_data = viewport->DrawData;
-
-    SDL_GPUCommandBuffer* command_buffer = SDL_AcquireGPUCommandBuffer(data->InitInfo.Device);
-
-    SDL_GPUTexture* swapchain_texture;
-    SDL_AcquireGPUSwapchainTexture(command_buffer, window, &swapchain_texture, nullptr, nullptr);
-
-    if (swapchain_texture != nullptr)
-    {
-        ImGui_ImplSDLGPU3_PrepareDrawData(draw_data, command_buffer); // FIXME-OPT: Not optimal, may this be done earlier?
-        SDL_GPUColorTargetInfo target_info = {};
-        target_info.texture = swapchain_texture;
-        target_info.clear_color = SDL_FColor{ 0.0f,0.0f,0.0f,1.0f };
-        target_info.load_op = SDL_GPU_LOADOP_CLEAR;
-        target_info.store_op = SDL_GPU_STOREOP_STORE;
-        target_info.mip_level = 0;
-        target_info.layer_or_depth_plane = 0;
-        target_info.cycle = false;
-        SDL_GPURenderPass* render_pass = SDL_BeginGPURenderPass(command_buffer, &target_info, 1, nullptr);
-        ImGui_ImplSDLGPU3_RenderDrawData(draw_data, command_buffer, render_pass);
-        SDL_EndGPURenderPass(render_pass);
-    }
-
-    SDL_SubmitGPUCommandBuffer(command_buffer);
-}
-
-static void ImGui_ImplSDLGPU3_DestroyWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplSDLGPU3_Data* data = ImGui_ImplSDLGPU3_GetBackendData();
-    if (viewport->RendererUserData)
-    {
-        SDL_Window* window = SDL_GetWindowFromID((SDL_WindowID)(intptr_t)viewport->PlatformHandle);
-        SDL_ReleaseWindowFromGPUDevice(data->InitInfo.Device, window);
-    }
-    viewport->RendererUserData = nullptr;
-}
-
-static void ImGui_ImplSDLGPU3_InitMultiViewportSupport()
-{
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Renderer_RenderWindow = ImGui_ImplSDLGPU3_RenderWindow;
-    platform_io.Renderer_CreateWindow = ImGui_ImplSDLGPU3_CreateWindow;
-    platform_io.Renderer_DestroyWindow = ImGui_ImplSDLGPU3_DestroyWindow;
-}
-
-static void ImGui_ImplSDLGPU3_ShutdownMultiViewportSupport()
-{
-    ImGui::DestroyPlatformWindows();
-}
-
-//-----------------------------------------------------------------------------
-
 #endif // #ifndef IMGUI_DISABLE

backends/imgui_impl_sdlgpu3.h

@@ -5,7 +5,6 @@
 //  [X] Renderer: User texture binding. Use 'SDL_GPUTexture*' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef! **IMPORTANT** Before 2025/08/08, ImTextureID was a reference to a SDL_GPUTextureSamplerBinding struct.
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
-//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // The aim of imgui_impl_sdlgpu3.h/.cpp is to be usable in your engine without any modification.
 // IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/
@@ -58,9 +57,6 @@ IMGUI_IMPL_API void     ImGui_ImplSDLGPU3_UpdateTexture(ImTextureData* tex);
 struct ImGui_ImplSDLGPU3_RenderState
 {
     SDL_GPUDevice*      Device;
-    SDL_GPUSampler*     SamplerLinear;      // Bilinear filtering sampler
-    SDL_GPUSampler*     SamplerNearest;     // Nearest/point filtering sampler
-    SDL_GPUSampler*     SamplerCurrent;     // Current sampler (may be changed by callback)
 };
 
 #endif // #ifndef IMGUI_DISABLE

backends/imgui_impl_sdlrenderer2.cpp

@@ -14,10 +14,10 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
-// Missing features:
-//  [ ] Renderer: Multi-viewport support (multiple windows).
+// Missing features or Issues:
+//  [ ] Renderer: Missing support for DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest callbacks: SDLRenderer2 does not support changing SDL_SCALE_MODE while rendering.
 
-// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
 // Learn about Dear ImGui:
 // - FAQ                  https://dearimgui.com/faq
@@ -26,6 +26,8 @@
 // - Introduction, links and more at the top of imgui.cpp
 
 // CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState (others cannot be supported). (#9378)
 //  2026-03-12: Fixed invalid assert in ImGui_ImplSDLRenderer2_UpdateTexture() if ImTextureID_Invalid is defined to be != 0, which became the default since 2026-03-12. (#9295)
 //  2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
 //  2025-06-11: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas. Removed ImGui_ImplSDLRenderer2_CreateFontsTexture() and ImGui_ImplSDLRenderer2_DestroyFontsTexture().
@@ -74,41 +76,6 @@ static ImGui_ImplSDLRenderer2_Data* ImGui_ImplSDLRenderer2_GetBackendData()
 }
 
 // Functions
-bool ImGui_ImplSDLRenderer2_Init(SDL_Renderer* renderer)
-{
-    ImGuiIO& io = ImGui::GetIO();
-    IMGUI_CHECKVERSION();
-    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
-    IM_ASSERT(renderer != nullptr && "SDL_Renderer not initialized!");
-
-    // Setup backend capabilities flags
-    ImGui_ImplSDLRenderer2_Data* bd = IM_NEW(ImGui_ImplSDLRenderer2_Data)();
-    io.BackendRendererUserData = (void*)bd;
-    io.BackendRendererName = "imgui_impl_sdlrenderer2";
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
-
-    bd->Renderer = renderer;
-
-    return true;
-}
-
-void ImGui_ImplSDLRenderer2_Shutdown()
-{
-    ImGui_ImplSDLRenderer2_Data* bd = ImGui_ImplSDLRenderer2_GetBackendData();
-    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
-    ImGuiIO& io = ImGui::GetIO();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-
-    ImGui_ImplSDLRenderer2_DestroyDeviceObjects();
-
-    io.BackendRendererName = nullptr;
-    io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
-    platform_io.ClearRendererHandlers();
-    IM_DELETE(bd);
-}
-
 static void ImGui_ImplSDLRenderer2_SetupRenderState(SDL_Renderer* renderer)
 {
     // Clear out any viewports and cliprect set by the user
@@ -124,6 +91,9 @@ void ImGui_ImplSDLRenderer2_NewFrame()
     IM_UNUSED(bd);
 }
 
+// Draw callbacks
+static void ImGui_ImplSDLRenderer2_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*) {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+
 void ImGui_ImplSDLRenderer2_RenderDrawData(ImDrawData* draw_data, SDL_Renderer* renderer)
 {
     // If there's a scale factor set by the user, use that instead
@@ -186,8 +156,7 @@ void ImGui_ImplSDLRenderer2_RenderDrawData(ImDrawData* draw_data, SDL_Renderer*
             if (pcmd->UserCallback)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplSDLRenderer2_DrawCallback_ResetRenderState)
                     ImGui_ImplSDLRenderer2_SetupRenderState(renderer);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -295,6 +264,44 @@ void ImGui_ImplSDLRenderer2_DestroyDeviceObjects()
         }
 }
 
+bool ImGui_ImplSDLRenderer2_Init(SDL_Renderer* renderer)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IMGUI_CHECKVERSION();
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
+    IM_ASSERT(renderer != nullptr && "SDL_Renderer not initialized!");
+
+    // Setup backend capabilities flags
+    ImGui_ImplSDLRenderer2_Data* bd = IM_NEW(ImGui_ImplSDLRenderer2_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_sdlrenderer2";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
+
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplSDLRenderer2_DrawCallback_ResetRenderState;
+
+    bd->Renderer = renderer;
+
+    return true;
+}
+
+void ImGui_ImplSDLRenderer2_Shutdown()
+{
+    ImGui_ImplSDLRenderer2_Data* bd = ImGui_ImplSDLRenderer2_GetBackendData();
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+
+    ImGui_ImplSDLRenderer2_DestroyDeviceObjects();
+
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
+    platform_io.ClearRendererHandlers();
+    IM_DELETE(bd);
+}
+
 //-----------------------------------------------------------------------------
 
 #if defined(__clang__)

backends/imgui_impl_sdlrenderer2.h

@@ -14,8 +14,8 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
-// Missing features:
-//  [ ] Renderer: Multi-viewport support (multiple windows).
+// Missing features or Issues:
+//  [ ] Renderer: Missing support for DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest callbacks: SDLRenderer2 does not support changing SDL_SCALE_MODE while rendering.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_sdlrenderer3.cpp

@@ -14,10 +14,8 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
-// Missing features:
-//  [ ] Renderer: Multi-viewport support (multiple windows).
 
-// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
 // Learn about Dear ImGui:
 // - FAQ                  https://dearimgui.com/faq
@@ -26,6 +24,8 @@
 // - Introduction, links and more at the top of imgui.cpp
 
 // CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. (#9378)
 //  2026-03-12: Fixed invalid assert in ImGui_ImplSDLRenderer3_UpdateTexture() if ImTextureID_Invalid is defined to be != 0, which became the default since 2026-03-12. (#9295)
 //  2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
 //  2025-06-11: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas. Removed ImGui_ImplSDLRenderer3_CreateFontsTexture() and ImGui_ImplSDLRenderer3_DestroyFontsTexture().
@@ -61,6 +61,9 @@ struct ImGui_ImplSDLRenderer3_Data
     SDL_Renderer*           Renderer;       // Main viewport's renderer
     ImVector<SDL_FColor>    ColorBuffer;
 
+    // Render State
+    SDL_ScaleMode           CurrentScaleMode;
+
     ImGui_ImplSDLRenderer3_Data()   { memset((void*)this, 0, sizeof(*this)); }
 };
 
@@ -72,41 +75,6 @@ static ImGui_ImplSDLRenderer3_Data* ImGui_ImplSDLRenderer3_GetBackendData()
 }
 
 // Functions
-bool ImGui_ImplSDLRenderer3_Init(SDL_Renderer* renderer)
-{
-    ImGuiIO& io = ImGui::GetIO();
-    IMGUI_CHECKVERSION();
-    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
-    IM_ASSERT(renderer != nullptr && "SDL_Renderer not initialized!");
-
-    // Setup backend capabilities flags
-    ImGui_ImplSDLRenderer3_Data* bd = IM_NEW(ImGui_ImplSDLRenderer3_Data)();
-    io.BackendRendererUserData = (void*)bd;
-    io.BackendRendererName = "imgui_impl_sdlrenderer3";
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
-    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
-
-    bd->Renderer = renderer;
-
-    return true;
-}
-
-void ImGui_ImplSDLRenderer3_Shutdown()
-{
-    ImGui_ImplSDLRenderer3_Data* bd = ImGui_ImplSDLRenderer3_GetBackendData();
-    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
-    ImGuiIO& io = ImGui::GetIO();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-
-    ImGui_ImplSDLRenderer3_DestroyDeviceObjects();
-
-    io.BackendRendererName = nullptr;
-    io.BackendRendererUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
-    platform_io.ClearRendererHandlers();
-    IM_DELETE(bd);
-}
-
 static void ImGui_ImplSDLRenderer3_SetupRenderState(SDL_Renderer* renderer)
 {
     // Clear out any viewports and cliprect set by the user
@@ -140,6 +108,11 @@ static int SDL_RenderGeometryRaw8BitColor(SDL_Renderer* renderer, ImVector<SDL_F
     return SDL_RenderGeometryRaw(renderer, texture, xy, xy_stride, color3, sizeof(*color3), uv, uv_stride, num_vertices, indices, num_indices, size_indices);
 }
 
+// Draw callbacks
+static void ImGui_ImplSDLRenderer3_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)   {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+static void ImGui_ImplSDLRenderer3_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)   { ImGui_ImplSDLRenderer3_Data* bd = ImGui_ImplSDLRenderer3_GetBackendData(); bd->CurrentScaleMode = SDL_SCALEMODE_LINEAR; }
+static void ImGui_ImplSDLRenderer3_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)  { ImGui_ImplSDLRenderer3_Data* bd = ImGui_ImplSDLRenderer3_GetBackendData(); bd->CurrentScaleMode = SDL_SCALEMODE_NEAREST; }
+
 void ImGui_ImplSDLRenderer3_RenderDrawData(ImDrawData* draw_data, SDL_Renderer* renderer)
 {
     ImGui_ImplSDLRenderer3_Data* bd = ImGui_ImplSDLRenderer3_GetBackendData();
@@ -206,8 +179,7 @@ void ImGui_ImplSDLRenderer3_RenderDrawData(ImDrawData* draw_data, SDL_Renderer*
             if (pcmd->UserCallback)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplSDLRenderer3_DrawCallback_ResetRenderState)
                     ImGui_ImplSDLRenderer3_SetupRenderState(renderer);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -233,6 +205,7 @@ void ImGui_ImplSDLRenderer3_RenderDrawData(ImDrawData* draw_data, SDL_Renderer*
 
                 // Bind texture, Draw
                 SDL_Texture* tex = (SDL_Texture*)pcmd->GetTexID();
+                SDL_SetTextureScaleMode(tex, bd->CurrentScaleMode);
                 SDL_RenderGeometryRaw8BitColor(renderer, bd->ColorBuffer, tex,
                     xy, (int)sizeof(ImDrawVert),
                     color, (int)sizeof(ImDrawVert),
@@ -311,6 +284,46 @@ void ImGui_ImplSDLRenderer3_DestroyDeviceObjects()
         }
 }
 
+bool ImGui_ImplSDLRenderer3_Init(SDL_Renderer* renderer)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IMGUI_CHECKVERSION();
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
+    IM_ASSERT(renderer != nullptr && "SDL_Renderer not initialized!");
+
+    // Setup backend capabilities flags
+    ImGui_ImplSDLRenderer3_Data* bd = IM_NEW(ImGui_ImplSDLRenderer3_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_sdlrenderer3";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
+
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplSDLRenderer3_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplSDLRenderer3_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplSDLRenderer3_DrawCallback_SetSamplerNearest;
+
+    bd->Renderer = renderer;
+
+    return true;
+}
+
+void ImGui_ImplSDLRenderer3_Shutdown()
+{
+    ImGui_ImplSDLRenderer3_Data* bd = ImGui_ImplSDLRenderer3_GetBackendData();
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+
+    ImGui_ImplSDLRenderer3_DestroyDeviceObjects();
+
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
+    io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures);
+    platform_io.ClearRendererHandlers();
+    IM_DELETE(bd);
+}
+
 //-----------------------------------------------------------------------------
 
 #if defined(__clang__)

backends/imgui_impl_sdlrenderer3.h

@@ -14,10 +14,8 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
-// Missing features:
-//  [ ] Renderer: Multi-viewport support (multiple windows).
 
-// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
 // Learn about Dear ImGui:
 // - FAQ                  https://dearimgui.com/faq

backends/imgui_impl_vulkan.h

@@ -2,11 +2,10 @@
 // This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
 
 // Implemented features:
-//  [!] Renderer: User texture binding. Use 'VkDescriptorSet' as texture identifier. Call ImGui_ImplVulkan_AddTexture() to register one. Read the FAQ about ImTextureID/ImTextureRef + https://github.com/ocornut/imgui/pull/914 for discussions.
+//  [!] Renderer: User texture binding. Use a VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE 'VkDescriptorSet' as texture identifier. Call ImGui_ImplVulkan_AddTexture() to register one. Read the FAQ about ImTextureID/ImTextureRef + https://github.com/ocornut/imgui/pull/914 for discussions.
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
-//  [x] Renderer: Multi-viewport / platform windows. With issues (flickering when creating a new viewport).
 
 // The aim of imgui_impl_vulkan.h/.cpp is to be usable in your engine without any modification.
 // IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/
@@ -79,24 +78,19 @@
 #endif
 
 // Backend uses a small number of descriptors per font atlas + as many as additional calls done to ImGui_ImplVulkan_AddTexture().
-#define IMGUI_IMPL_VULKAN_MINIMUM_IMAGE_SAMPLER_POOL_SIZE   (8)     // Minimum per atlas
+#define IMGUI_IMPL_VULKAN_MINIMUM_SAMPLED_IMAGE_POOL_SIZE   (8)     // Minimum per atlas
+#define IMGUI_IMPL_VULKAN_MINIMUM_SAMPLER_POOL_SIZE         (2)     // Minimum for linear + nearest
 
 // Specify settings to create pipeline and swapchain
 struct ImGui_ImplVulkan_PipelineInfo
 {
-    // For Main viewport only
     VkRenderPass                    RenderPass;                     // Ignored if using dynamic rendering
-
-    // For Main and Secondary viewports
     uint32_t                        Subpass;                        //
     VkSampleCountFlagBits           MSAASamples = {};               // 0 defaults to VK_SAMPLE_COUNT_1_BIT
     ImVector<VkDynamicState>        ExtraDynamicStates;             // Optional, allows to insert more dynamic states into our VkPipeline
 #ifdef IMGUI_IMPL_VULKAN_HAS_DYNAMIC_RENDERING
     VkPipelineRenderingCreateInfoKHR PipelineRenderingCreateInfo;   // Optional, valid if .sType == VK_STRUCTURE_TYPE_PIPELINE_RENDERING_CREATE_INFO_KHR
 #endif
-
-    // For Secondary viewports only (created/managed by backend)
-    VkImageUsageFlags               SwapChainImageUsage;            // Extra flags for vkCreateSwapchainKHR() calls for secondary viewports. We automatically add VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT. You can add e.g. VK_IMAGE_USAGE_TRANSFER_SRC_BIT if you need to capture from viewports.
 };
 
 // Initialization data, for ImGui_ImplVulkan_Init()
@@ -116,21 +110,20 @@ struct ImGui_ImplVulkan_InitInfo
     uint32_t                        QueueFamily;
     VkQueue                         Queue;
     VkDescriptorPool                DescriptorPool;             // See requirements in note above; ignored if using DescriptorPoolSize > 0
-    uint32_t                        DescriptorPoolSize;         // Optional: set to create internal descriptor pool automatically instead of using DescriptorPool.
+    uint32_t                        DescriptorPoolSize;         // Optional: set to create internal ImageView descriptor pool automatically instead of using DescriptorPool.
     uint32_t                        MinImageCount;              // >= 2
     uint32_t                        ImageCount;                 // >= MinImageCount
     VkPipelineCache                 PipelineCache;              // Optional
 
     // Pipeline
     ImGui_ImplVulkan_PipelineInfo   PipelineInfoMain;           // Infos for Main Viewport (created by app/user)
-    ImGui_ImplVulkan_PipelineInfo   PipelineInfoForViewports;   // Infos for Secondary Viewports (created by backend)
     //VkRenderPass                  RenderPass;                 // --> Since 2025/09/26: set 'PipelineInfoMain.RenderPass' instead
     //uint32_t                      Subpass;                    // --> Since 2025/09/26: set 'PipelineInfoMain.Subpass' instead
     //VkSampleCountFlagBits         MSAASamples;                // --> Since 2025/09/26: set 'PipelineInfoMain.MSAASamples' instead
     //VkPipelineRenderingCreateInfoKHR PipelineRenderingCreateInfo; // Since 2025/09/26: set 'PipelineInfoMain.PipelineRenderingCreateInfo' instead
 
     // (Optional) Dynamic Rendering
-    // Need to explicitly enable VK_KHR_dynamic_rendering extension to use this, even for Vulkan 1.3 + setup PipelineInfoMain.PipelineRenderingCreateInfo and PipelineInfoViewports.PipelineRenderingCreateInfo.
+    // Need to explicitly enable VK_KHR_dynamic_rendering extension to use this, even for Vulkan 1.3 + setup PipelineInfoMain.PipelineRenderingCreateInfo.
     bool                            UseDynamicRendering;
 
     // (Optional) Allocation, Debugging
@@ -160,12 +153,14 @@ IMGUI_IMPL_API void             ImGui_ImplVulkan_CreateMainPipeline(const ImGui_
 // (Advanced) Use e.g. if you need to precisely control the timing of texture updates (e.g. for staged rendering), by setting ImDrawData::Textures = nullptr to handle this manually.
 IMGUI_IMPL_API void             ImGui_ImplVulkan_UpdateTexture(ImTextureData* tex);
 
-// Register a texture (VkDescriptorSet == ImTextureID)
-// FIXME: This is experimental in the sense that we are unsure how to best design/tackle this problem
-// Please post to https://github.com/ocornut/imgui/pull/914 if you have suggestions.
-IMGUI_IMPL_API VkDescriptorSet  ImGui_ImplVulkan_AddTexture(VkSampler sampler, VkImageView image_view, VkImageLayout image_layout);
+// Register a texture (VkDescriptorSet for a VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE == ImTextureID)
+IMGUI_IMPL_API VkDescriptorSet  ImGui_ImplVulkan_AddTexture(VkImageView image_view, VkImageLayout image_layout);
 IMGUI_IMPL_API void             ImGui_ImplVulkan_RemoveTexture(VkDescriptorSet descriptor_set);
 
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+IMGUI_IMPL_API VkDescriptorSet  ImGui_ImplVulkan_AddTexture(VkSampler sampler, VkImageView image_view, VkImageLayout image_layout); // Ignore VkSampler
+#endif
+
 // Optional: load Vulkan functions with a custom function loader
 // This is only useful with IMGUI_IMPL_VULKAN_NO_PROTOTYPES / VK_NO_PROTOTYPES
 IMGUI_IMPL_API bool             ImGui_ImplVulkan_LoadFunctions(uint32_t api_version, PFN_vkVoidFunction(*loader_func)(const char* function_name, void* user_data), void* user_data = nullptr);
@@ -212,7 +207,6 @@ IMGUI_IMPL_API VkPresentModeKHR     ImGui_ImplVulkanH_SelectPresentMode(VkPhysic
 IMGUI_IMPL_API VkPhysicalDevice     ImGui_ImplVulkanH_SelectPhysicalDevice(VkInstance instance);
 IMGUI_IMPL_API uint32_t             ImGui_ImplVulkanH_SelectQueueFamilyIndex(VkPhysicalDevice physical_device);
 IMGUI_IMPL_API int                  ImGui_ImplVulkanH_GetMinImageCountFromPresentMode(VkPresentModeKHR present_mode);
-IMGUI_IMPL_API ImGui_ImplVulkanH_Window* ImGui_ImplVulkanH_GetWindowDataFromViewport(ImGuiViewport* viewport); // Access to Vulkan objects associated with a viewport (e.g to export a screenshot)
 
 // Helper structure to hold the data needed by one rendering frame
 // (Used by example's main.cpp. Used by multi-viewport features. Probably NOT used by your own engine/app.)
@@ -250,6 +244,7 @@ struct ImGui_ImplVulkanH_Window
     int                     Height;
     VkSwapchainKHR          Swapchain;
     VkRenderPass            RenderPass;
+    VkPipeline              Pipeline;           // The window pipeline may uses a different VkRenderPass than the one passed in ImGui_ImplVulkan_InitInfo
     uint32_t                FrameIndex;         // Current frame being rendered to (0 <= FrameIndex < FrameInFlightCount)
     uint32_t                ImageCount;         // Number of simultaneous in-flight frames (returned by vkGetSwapchainImagesKHR, usually derived from min_image_count)
     uint32_t                SemaphoreCount;     // Number of simultaneous in-flight frames + 1, to be able to use it in vkAcquireNextImageKHR
@@ -262,7 +257,7 @@ struct ImGui_ImplVulkanH_Window
         memset((void*)this, 0, sizeof(*this));
 
         // Parameters to create SwapChain
-        PresentMode = (VkPresentModeKHR)~0;             // Ensure we get an error if user doesn't set this.
+        PresentMode = VK_PRESENT_MODE_MAX_ENUM_KHR;     // Ensure we get an error if user doesn't set this.
 
         // Parameters to create RenderPass
         AttachmentDesc.format = VK_FORMAT_UNDEFINED;    // Will automatically use wd->SurfaceFormat.format.

backends/imgui_impl_wgpu.cpp

@@ -7,8 +7,6 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
 //  [X] Renderer: Texture updates support for dynamic font system (ImGuiBackendFlags_RendererHasTextures).
-// Missing features or Issues:
-//  [ ] Renderer: Multi-viewport support (multiple windows), useful for desktop.
 
 // Read imgui_impl_wgpu.h about how to use the IMGUI_IMPL_WEBGPU_BACKEND_WGPU or IMGUI_IMPL_WEBGPU_BACKEND_DAWN flags.
 
@@ -22,6 +20,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. (#9378)
 //  2026-03-25: Added support for WGVK native backend via IMGUI_IMPL_WEBGPU_BACKEND_WGVK define, with SPIRV shaders if WGSL is not available. (#9316, #9246, #9257)
 //  2026-03-09: Removed support for Emscripten < 4.0.10. (#9281)
 //  2025-10-16: Update to compile with Dawn and Emscripten's 4.0.10+ '--use-port=emdawnwebgpu' ports. (#8381, #8898)
@@ -85,11 +84,13 @@ struct ImGui_ImplWGPU_Texture
 
 struct RenderResources
 {
-    WGPUSampler         Sampler = nullptr;              // Sampler for textures
-    WGPUBuffer          Uniforms = nullptr;             // Shader uniforms
-    WGPUBindGroup       CommonBindGroup = nullptr;      // Resources bind-group to bind the common resources to pipeline
-    ImGuiStorage        ImageBindGroups;                // Resources bind-group to bind the font/image resources to pipeline (this is a key->value map)
-    WGPUBindGroupLayout ImageBindGroupLayout = nullptr; // Cache layout used for the image bind group. Avoids allocating unnecessary JS objects when working with WebASM
+    WGPUSampler         SamplerLinear = nullptr;            // Bilinear sampler
+    WGPUSampler         SamplerNearest = nullptr;           // Nearest/point sampler
+    WGPUBuffer          Uniforms = nullptr;                 // Shader uniforms
+    WGPUBindGroup       CommonBindGroupLinear = nullptr;    // Common bind-group bound to group 0 (uniforms + SamplerLinear)
+    WGPUBindGroup       CommonBindGroupNearest = nullptr;   // Common bind-group bound to group 0 (uniforms + SamplerNearest)
+    ImGuiStorage        ImageBindGroups;                    // Resources bind-group to bind the font/image resources to pipeline (this is a key->value map)
+    WGPUBindGroupLayout ImageBindGroupLayout = nullptr;     // Cache layout used for the image bind group. Avoids allocating unnecessary JS objects when working with WebASM
 };
 
 struct FrameResources
@@ -116,6 +117,7 @@ struct ImGui_ImplWGPU_Data
     WGPUTextureFormat       renderTargetFormat = WGPUTextureFormat_Undefined;
     WGPUTextureFormat       depthStencilFormat = WGPUTextureFormat_Undefined;
     WGPURenderPipeline      pipelineState = nullptr;
+    ImGui_ImplWGPU_RenderState* RenderState = nullptr;  // == ImGui::GetPlatformIO().Renderer_RenderState during rendering.
 
     RenderResources         renderResources;
     FrameResources*         pFrameResources = nullptr;
@@ -298,9 +300,11 @@ static void SafeRelease(WGPUShaderModule& res)
 }
 static void SafeRelease(RenderResources& res)
 {
-    SafeRelease(res.Sampler);
+    SafeRelease(res.SamplerLinear);
+    SafeRelease(res.SamplerNearest);
     SafeRelease(res.Uniforms);
-    SafeRelease(res.CommonBindGroup);
+    SafeRelease(res.CommonBindGroupLinear);
+    SafeRelease(res.CommonBindGroupNearest);
     SafeRelease(res.ImageBindGroupLayout);
 };
 
@@ -315,6 +319,7 @@ static void SafeRelease(FrameResources& res)
 static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModuleWGSL(const char* wgsl_source)
 {
     ImGui_ImplWGPU_Data* bd = ImGui_ImplWGPU_GetBackendData();
+    IM_UNUSED(bd);
 
     WGPUShaderSourceWGSL wgsl_desc = {};
     wgsl_desc.chain.sType = WGPUSType_ShaderSourceWGSL;
@@ -323,10 +328,31 @@ static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModuleWGSL(con
     WGPUShaderModuleDescriptor desc = {};
     desc.nextInChain = (WGPUChainedStruct*)&wgsl_desc;
 
-    WGPUProgrammableStageDescriptor stage_desc = {};
-    stage_desc.module = wgpuDeviceCreateShaderModule(bd->wgpuDevice, &desc);
+    // Detect shader compilation errors by using an error scope.
+    // Flag to be passed into the validation callback `userdata1` pointer.
+    int validation_error = 0;
+    wgpuDevicePushErrorScope(bd->wgpuDevice, WGPUErrorFilter_Validation);
+    WGPUShaderModule module = wgpuDeviceCreateShaderModule(bd->wgpuDevice, &desc);
+    WGPUPopErrorScopeCallbackInfo pop_cb = {};
+    pop_cb.mode = WGPUCallbackMode_AllowSpontaneous;
+    pop_cb.callback = [](WGPUPopErrorScopeStatus, WGPUErrorType type, WGPUStringView, void* userdata1, void*)
+    {
+        if (type == WGPUErrorType_Validation)
+            *static_cast<int*>(userdata1) = 1;
+    };
+    pop_cb.userdata1 = &validation_error;
+    wgpuDevicePopErrorScope(bd->wgpuDevice, pop_cb);
 
-    stage_desc.entryPoint = { "main", WGPU_STRLEN };
+    WGPUProgrammableStageDescriptor stage_desc = {};
+    if (module && !validation_error)
+    {
+        stage_desc.module = module;
+        stage_desc.entryPoint = { "main", WGPU_STRLEN };
+    }
+    else if (module)
+    {
+        wgpuShaderModuleRelease(module);
+    }
     return stage_desc;
 }
 
@@ -420,15 +446,19 @@ static void ImGui_ImplWGPU_SetupRenderState(ImDrawData* draw_data, WGPURenderPas
     wgpuRenderPassEncoderSetVertexBuffer(ctx, 0, fr->VertexBuffer, 0, fr->VertexBufferSize * sizeof(ImDrawVert));
     wgpuRenderPassEncoderSetIndexBuffer(ctx, fr->IndexBuffer, sizeof(ImDrawIdx) == 2 ? WGPUIndexFormat_Uint16 : WGPUIndexFormat_Uint32, 0, fr->IndexBufferSize * sizeof(ImDrawIdx));
     wgpuRenderPassEncoderSetPipeline(ctx, bd->pipelineState);
-    wgpuRenderPassEncoderSetBindGroup(ctx, 0, bd->renderResources.CommonBindGroup, 0, nullptr);
+    wgpuRenderPassEncoderSetBindGroup(ctx, 0, bd->renderResources.CommonBindGroupLinear, 0, nullptr);
 
     // Setup blend factor
     WGPUColor blend_color = { 0.f, 0.f, 0.f, 0.f };
     wgpuRenderPassEncoderSetBlendConstant(ctx, &blend_color);
 }
 
+// Draw callbacks
+static void ImGui_ImplWGPU_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*)   {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
+static void ImGui_ImplWGPU_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*)   { ImGui_ImplWGPU_Data* bd = ImGui_ImplWGPU_GetBackendData(); wgpuRenderPassEncoderSetBindGroup(bd->RenderState->RenderPassEncoder, 0, bd->renderResources.CommonBindGroupLinear, 0, nullptr); }
+static void ImGui_ImplWGPU_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*)  { ImGui_ImplWGPU_Data* bd = ImGui_ImplWGPU_GetBackendData(); wgpuRenderPassEncoderSetBindGroup(bd->RenderState->RenderPassEncoder, 0, bd->renderResources.CommonBindGroupNearest, 0, nullptr); }
+
 // Render function
-// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder pass_encoder)
 {
     // Avoid rendering when minimized
@@ -523,7 +553,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
     ImGui_ImplWGPU_RenderState render_state;
     render_state.Device = bd->wgpuDevice;
     render_state.RenderPassEncoder = pass_encoder;
-    platform_io.Renderer_RenderState = &render_state;
+    platform_io.Renderer_RenderState = bd->RenderState = &render_state;
 
     // Render command lists
     // (Because we merged all buffers into a single one, we maintain our own offset into them)
@@ -539,8 +569,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
             if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
-                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                if (pcmd->UserCallback == ImGui_ImplWGPU_DrawCallback_ResetRenderState)
                     ImGui_ImplWGPU_SetupRenderState(draw_data, pass_encoder, fr);
                 else
                     pcmd->UserCallback(draw_list, pcmd);
@@ -551,12 +580,11 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
                 ImTextureID tex_id = pcmd->GetTexID();
                 ImGuiID tex_id_hash = ImHashData(&tex_id, sizeof(tex_id), 0);
                 WGPUBindGroup bind_group = (WGPUBindGroup)bd->renderResources.ImageBindGroups.GetVoidPtr(tex_id_hash);
-                if (!bind_group)
-                {
-                    bind_group = ImGui_ImplWGPU_CreateImageBindGroup(bd->renderResources.ImageBindGroupLayout, (WGPUTextureView)tex_id);
-                    bd->renderResources.ImageBindGroups.SetVoidPtr(tex_id_hash, bind_group);
-                }
-                wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, (WGPUBindGroup)bind_group, 0, nullptr);
+                if (!bind_group && tex_id != 0)
+                    if ((bind_group = ImGui_ImplWGPU_CreateImageBindGroup(bd->renderResources.ImageBindGroupLayout, (WGPUTextureView)tex_id)) != 0)
+                        bd->renderResources.ImageBindGroups.SetVoidPtr(tex_id_hash, bind_group);
+                if (bind_group)
+                    wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, (WGPUBindGroup)bind_group, 0, nullptr);
 
                 // Project scissor/clipping rectangles into framebuffer space
                 ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
@@ -565,8 +593,8 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
                 // Clamp to viewport as wgpuRenderPassEncoderSetScissorRect() won't accept values that are off bounds
                 if (clip_min.x < 0.0f) { clip_min.x = 0.0f; }
                 if (clip_min.y < 0.0f) { clip_min.y = 0.0f; }
-                if (clip_max.x > fb_width) { clip_max.x = (float)fb_width; }
-                if (clip_max.y > fb_height) { clip_max.y = (float)fb_height; }
+                if (clip_max.x > (float)fb_width) { clip_max.x = (float)fb_width; }
+                if (clip_max.y > (float)fb_height) { clip_max.y = (float)fb_height; }
                 if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
@@ -588,7 +616,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
     }
     image_bind_groups.Data.resize(0);
 
-    platform_io.Renderer_RenderState = nullptr;
+    platform_io.Renderer_RenderState = bd->RenderState = nullptr;
 }
 
 static void ImGui_ImplWGPU_DestroyTexture(ImTextureData* tex)
@@ -816,29 +844,35 @@ bool ImGui_ImplWGPU_CreateDeviceObjects()
 
     ImGui_ImplWGPU_CreateUniformBuffer();
 
-    // Create sampler
+    // Create samplers (Linear/Nearest)
     // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
     WGPUSamplerDescriptor sampler_desc = {};
-    sampler_desc.minFilter = WGPUFilterMode_Linear;
-    sampler_desc.magFilter = WGPUFilterMode_Linear;
-    sampler_desc.mipmapFilter = WGPUMipmapFilterMode_Linear;
     sampler_desc.addressModeU = WGPUAddressMode_ClampToEdge;
     sampler_desc.addressModeV = WGPUAddressMode_ClampToEdge;
     sampler_desc.addressModeW = WGPUAddressMode_ClampToEdge;
     sampler_desc.maxAnisotropy = 1;
-    bd->renderResources.Sampler = wgpuDeviceCreateSampler(bd->wgpuDevice, &sampler_desc);
+    sampler_desc.minFilter = WGPUFilterMode_Linear;
+    sampler_desc.magFilter = WGPUFilterMode_Linear;
+    sampler_desc.mipmapFilter = WGPUMipmapFilterMode_Linear;
+    bd->renderResources.SamplerLinear = wgpuDeviceCreateSampler(bd->wgpuDevice, &sampler_desc);
+    sampler_desc.minFilter = WGPUFilterMode_Nearest;
+    sampler_desc.magFilter = WGPUFilterMode_Nearest;
+    sampler_desc.mipmapFilter = WGPUMipmapFilterMode_Nearest;
+    bd->renderResources.SamplerNearest = wgpuDeviceCreateSampler(bd->wgpuDevice, &sampler_desc);
 
-    // Create resource bind group
+    // Create resource bind groups (one per sampler, otherwise identical)
     WGPUBindGroupEntry common_bg_entries[] =
     {
         { nullptr, 0, bd->renderResources.Uniforms, 0, MEMALIGN(sizeof(Uniforms), 16), 0, 0 },
-        { nullptr, 1, 0, 0, 0, bd->renderResources.Sampler, 0 },
+        { nullptr, 1, 0, 0, 0, bd->renderResources.SamplerLinear, 0 },
     };
     WGPUBindGroupDescriptor common_bg_descriptor = {};
     common_bg_descriptor.layout = bg_layouts[0];
     common_bg_descriptor.entryCount = sizeof(common_bg_entries) / sizeof(WGPUBindGroupEntry);
     common_bg_descriptor.entries = common_bg_entries;
-    bd->renderResources.CommonBindGroup = wgpuDeviceCreateBindGroup(bd->wgpuDevice, &common_bg_descriptor);
+    bd->renderResources.CommonBindGroupLinear = wgpuDeviceCreateBindGroup(bd->wgpuDevice, &common_bg_descriptor);
+    common_bg_entries[1].sampler = bd->renderResources.SamplerNearest;
+    bd->renderResources.CommonBindGroupNearest = wgpuDeviceCreateBindGroup(bd->wgpuDevice, &common_bg_descriptor);
     bd->renderResources.ImageBindGroupLayout = bg_layouts[1];
 
     SafeRelease(vertex_shader_desc.module);
@@ -890,6 +924,11 @@ bool ImGui_ImplWGPU_Init(ImGui_ImplWGPU_InitInfo* init_info)
     io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
     io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We can honor ImGuiPlatformIO::Textures[] requests during render.
 
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.DrawCallback_ResetRenderState = ImGui_ImplWGPU_DrawCallback_ResetRenderState;
+    platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplWGPU_DrawCallback_SetSamplerLinear;
+    platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplWGPU_DrawCallback_SetSamplerNearest;
+
     bd->initInfo = *init_info;
     bd->wgpuDevice = init_info->Device;
     bd->defaultQueue = wgpuDeviceGetQueue(bd->wgpuDevice);
@@ -898,11 +937,7 @@ bool ImGui_ImplWGPU_Init(ImGui_ImplWGPU_InitInfo* init_info)
     bd->numFramesInFlight = init_info->NumFramesInFlight;
     bd->frameIndex = UINT_MAX;
 
-    bd->renderResources.Sampler = nullptr;
-    bd->renderResources.Uniforms = nullptr;
-    bd->renderResources.CommonBindGroup = nullptr;
     bd->renderResources.ImageBindGroups.Data.reserve(100);
-    bd->renderResources.ImageBindGroupLayout = nullptr;
 
     // Create buffers with a default size (they will later be grown as needed)
     bd->pFrameResources = new FrameResources[bd->numFramesInFlight];

backends/imgui_impl_wgpu.h

@@ -19,8 +19,6 @@
 //  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
 //  [X] Renderer: Texture updates support for dynamic font system (ImGuiBackendFlags_RendererHasTextures).
-// Missing features or Issues:
-//  [ ] Renderer: Multi-viewport support (multiple windows), useful for desktop.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/imgui_impl_win32.cpp

@@ -7,7 +7,6 @@
 //  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy VK_* values are obsolete since 1.87 and not supported since 1.91.5]
 //  [X] Platform: Gamepad support.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
-//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -22,23 +21,14 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
-//  2026-03-31: [Viewports] Fixed setting/getting size when viewports have OS decorations (e.g. io.ConfigViewportsNoDecoration = false) and process is running in Per-Monitor V2 DPI mode. (#8897)
 //  2026-01-28: Inputs: Minor optimization not submitting gamepad input if packet number has not changed (reworked from 2025-09-23 attempt). (#9202, #8556)
-//  2026-01-26: [Viewports] Fixed an issue from 1.90.5 where newly appearing windows that are not parented to the main viewport don't have task bar icon appear before the windows was explicited refocused. (#7354, #8669)
 //  2025-12-03: Inputs: handle WM_IME_CHAR/WM_IME_COMPOSITION messages to support Unicode inputs on MBCS (non-Unicode) Windows. (#9099, #3653, #5961)
 //  2025-10-19: Inputs: Revert previous change to allow for io.ClearInputKeys() on focus-out not losing gamepad state.
 //  2025-09-23: Inputs: Minor optimization not submitting gamepad input if packet number has not changed.
 //  2025-09-18: Call platform_io.ClearPlatformHandlers() on shutdown.
-//  2025-06-02: [Viewports] WM_DPICHANGED also apply io.ConfigDpiScaleViewports for main viewport instead of letting it be done by application code.
 //  2025-04-30: Inputs: Fixed an issue where externally losing mouse capture (due to e.g. focus loss) would fail to claim it again the next subsequent click. (#8594)
-//  2025-03-26: [Viewports] Viewports: fixed an issue when closing a window from the OS close button (with io.ConfigViewportsNoDecoration = false) while user code was discarding the 'bool* p_open = false' output from Begin(). Because we allowed the Win32 window to close early, Windows destroyed it and our imgui window became not visible even though user code was still submitting it.
 //  2025-03-10: When dealing with OEM keys, use scancodes instead of translated keycodes to choose ImGuiKey values. (#7136, #7201, #7206, #7306, #7670, #7672, #8468)
-//  2025-02-21: [Viewports] WM_SETTINGCHANGE's SPI_SETWORKAREA message also triggers a refresh of monitor list. (#8415)
 //  2025-02-18: Added ImGuiMouseCursor_Wait and ImGuiMouseCursor_Progress mouse cursor support.
-//  2024-11-21: [Viewports] Fixed a crash when multiple processes are running with multi-viewports, caused by misusage of GetProp(). (#8162, #8069)
-//  2024-10-28: [Viewports] Rely on property stored inside HWND to retrieve context/viewport, should facilitate attempt to use this for parallel contexts. (#8069)
-//  2024-09-16: [Viewports] Inputs: fixed an issue where a viewport destroyed while clicking would hog mouse tracking and temporary lead to incorrect update of HoveredWindow. (#7971)
 //  2024-07-08: Inputs: Fixed ImGuiMod_Super being mapped to VK_APPS instead of VK_LWIN||VK_RWIN. (#7768)
 //  2023-10-05: Inputs: Added support for extra ImGuiKey values: F13 to F24 function keys, app back/forward keys.
 //  2023-09-25: Inputs: Synthesize key-down event on key-up for VK_SNAPSHOT / ImGuiKey_PrintScreen as Windows doesn't emit it (same behavior as GLFW/SDL).
@@ -109,7 +99,6 @@
 typedef DWORD(WINAPI* PFN_XInputGetCapabilities)(DWORD, DWORD, XINPUT_CAPABILITIES*);
 typedef DWORD(WINAPI* PFN_XInputGetState)(DWORD, XINPUT_STATE*);
 #endif
-typedef BOOL(WINAPI* PFN_AdjustWindowRectExForDpi)(LPRECT, DWORD, BOOL, DWORD, UINT);
 
 // Clang/GCC warnings with -Weverything
 #if defined(__clang__)
@@ -122,12 +111,6 @@ typedef BOOL(WINAPI* PFN_AdjustWindowRectExForDpi)(LPRECT, DWORD, BOOL, DWORD, U
 #pragma GCC diagnostic ignored "-Wcast-function-type"       // warning: cast between incompatible function types (for loader)
 #endif
 
-// Forward Declarations
-static void ImGui_ImplWin32_InitMultiViewportSupport(bool platform_has_own_dc);
-static void ImGui_ImplWin32_ShutdownMultiViewportSupport();
-static void ImGui_ImplWin32_UpdateMonitors();
-static bool ImGui_ImplWin32_IsDpiAwarenessPerMonitorAwareV2();
-
 struct ImGui_ImplWin32_Data
 {
     HWND                        hWnd;
@@ -138,9 +121,6 @@ struct ImGui_ImplWin32_Data
     INT64                       TicksPerSecond;
     ImGuiMouseCursor            LastMouseCursor;
     UINT32                      KeyboardCodePage;
-    bool                        WantUpdateMonitors;
-    bool                        IsPerMonitorDpiAwareV2;
-    PFN_AdjustWindowRectExForDpi AdjustWindowRectExForDpi;
 
 #ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
     bool                        HasGamepad;
@@ -196,9 +176,6 @@ static bool ImGui_ImplWin32_InitEx(void* hwnd, bool platform_has_own_dc)
     io.BackendPlatformName = "imgui_impl_win32";
     io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;         // We can honor GetMouseCursor() values (optional)
     io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos;          // We can honor io.WantSetMousePos requests (optional, rarely used)
-    io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports;    // We can create multi-viewports on the Platform side (optional)
-    io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport; // We can call io.AddMouseViewportEvent() with correct data (optional)
-    io.BackendFlags |= ImGuiBackendFlags_HasParentViewport;       // We can honor viewport->ParentViewportId by applying the corresponding parent/child relationship at platform levle (optional)
 
     bd->hWnd = (HWND)hwnd;
     bd->TicksPerSecond = perf_frequency;
@@ -206,21 +183,10 @@ static bool ImGui_ImplWin32_InitEx(void* hwnd, bool platform_has_own_dc)
     bd->LastMouseCursor = ImGuiMouseCursor_COUNT;
     ImGui_ImplWin32_UpdateKeyboardCodePage(io);
 
-    // Update monitor a first time during init
-    ImGui_ImplWin32_UpdateMonitors();
-
     // Our mouse update function expect PlatformHandle to be filled for the main viewport
     ImGuiViewport* main_viewport = ImGui::GetMainViewport();
     main_viewport->PlatformHandle = main_viewport->PlatformHandleRaw = (void*)bd->hWnd;
-
-    // Be aware that GetPropA()/SetPropA() may be accessed from other processes.
-    // So as we store a pointer in IMGUI_CONTEXT we need to make sure we only call GetPropA() on windows owned by our process.
-    ::SetPropA(bd->hWnd, "IMGUI_CONTEXT", ImGui::GetCurrentContext());
-    ImGui_ImplWin32_InitMultiViewportSupport(platform_has_own_dc);
-
-    if (HINSTANCE user32_dll = ::GetModuleHandleA("user32.dll"))
-        bd->AdjustWindowRectExForDpi = (PFN_AdjustWindowRectExForDpi)::GetProcAddress(user32_dll, "AdjustWindowRectExForDpi");
-    bd->IsPerMonitorDpiAwareV2 = ImGui_ImplWin32_IsDpiAwarenessPerMonitorAwareV2();
+    IM_UNUSED(platform_has_own_dc); // Used in 'docking' branch
 
     // Dynamically load XInput library
 #ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
@@ -264,9 +230,6 @@ void    ImGui_ImplWin32_Shutdown()
     ImGuiIO& io = ImGui::GetIO();
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
-    ::SetPropA(bd->hWnd, "IMGUI_CONTEXT", nullptr);
-    ImGui_ImplWin32_ShutdownMultiViewportSupport();
-
     // Unload XInput library
 #ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
     if (bd->XInputDLL)
@@ -275,7 +238,7 @@ void    ImGui_ImplWin32_Shutdown()
 
     io.BackendPlatformName = nullptr;
     io.BackendPlatformUserData = nullptr;
-    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasSetMousePos | ImGuiBackendFlags_HasGamepad | ImGuiBackendFlags_PlatformHasViewports | ImGuiBackendFlags_HasMouseHoveredViewport | ImGuiBackendFlags_HasParentViewport);
+    io.BackendFlags &= ~(ImGuiBackendFlags_HasMouseCursors | ImGuiBackendFlags_HasSetMousePos | ImGuiBackendFlags_HasGamepad);
     platform_io.ClearPlatformHandlers();
     IM_DELETE(bd);
 }
@@ -348,69 +311,32 @@ static void ImGui_ImplWin32_UpdateKeyModifiers(ImGuiIO& io)
     io.AddKeyEvent(ImGuiMod_Super, IsVkDown(VK_LWIN) || IsVkDown(VK_RWIN));
 }
 
-static ImGuiViewport* ImGui_ImplWin32_FindViewportByPlatformHandle(ImGuiPlatformIO& platform_io, HWND hwnd)
-{
-    // We cannot use ImGui::FindViewportByPlatformHandle() because it doesn't take a context.
-    // When called from ImGui_ImplWin32_WndProcHandler_PlatformWindow() we don't assume that context is bound.
-    //return ImGui::FindViewportByPlatformHandle((void*)hwnd);
-    for (ImGuiViewport* viewport : platform_io.Viewports)
-        if (viewport->PlatformHandle == hwnd)
-            return viewport;
-    return nullptr;
-}
-
-// This code supports multi-viewports (multiple OS Windows mapped into different Dear ImGui viewports)
-// Because of that, it is a little more complicated than your typical single-viewport binding code!
-static void ImGui_ImplWin32_UpdateMouseData(ImGuiIO& io, ImGuiPlatformIO& platform_io)
+static void ImGui_ImplWin32_UpdateMouseData(ImGuiIO& io)
 {
     ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData(io);
     IM_ASSERT(bd->hWnd != 0);
 
-    POINT mouse_screen_pos;
-    bool has_mouse_screen_pos = ::GetCursorPos(&mouse_screen_pos) != 0;
-
     HWND focused_window = ::GetForegroundWindow();
-    const bool is_app_focused = (focused_window && (focused_window == bd->hWnd || ::IsChild(focused_window, bd->hWnd) || ImGui_ImplWin32_FindViewportByPlatformHandle(platform_io, focused_window)));
+    const bool is_app_focused = (focused_window == bd->hWnd);
     if (is_app_focused)
     {
         // (Optional) Set OS mouse position from Dear ImGui if requested (rarely used, only when io.ConfigNavMoveSetMousePos is enabled by user)
-        // When multi-viewports are enabled, all Dear ImGui positions are same as OS positions.
         if (io.WantSetMousePos)
         {
             POINT pos = { (int)io.MousePos.x, (int)io.MousePos.y };
-            if ((io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) == 0)
-                ::ClientToScreen(focused_window, &pos);
-            ::SetCursorPos(pos.x, pos.y);
+            if (::ClientToScreen(bd->hWnd, &pos))
+                ::SetCursorPos(pos.x, pos.y);
         }
 
         // (Optional) Fallback to provide mouse position when focused (WM_MOUSEMOVE already provides this when hovered or captured)
         // This also fills a short gap when clicking non-client area: WM_NCMOUSELEAVE -> modal OS move -> gap -> WM_NCMOUSEMOVE
-        if (!io.WantSetMousePos && bd->MouseTrackedArea == 0 && has_mouse_screen_pos)
+        if (!io.WantSetMousePos && bd->MouseTrackedArea == 0)
         {
-            // Single viewport mode: mouse position in client window coordinates (io.MousePos is (0,0) when the mouse is on the upper-left corner of the app window)
-            // (This is the position you can get with ::GetCursorPos() + ::ScreenToClient() or WM_MOUSEMOVE.)
-            // Multi-viewport mode: mouse position in OS absolute coordinates (io.MousePos is (0,0) when the mouse is on the upper-left of the primary monitor)
-            // (This is the position you can get with ::GetCursorPos() or WM_MOUSEMOVE + ::ClientToScreen(). In theory adding viewport->Pos to a client position would also be the same.)
-            POINT mouse_pos = mouse_screen_pos;
-            if (!(io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable))
-                ::ScreenToClient(bd->hWnd, &mouse_pos);
-            io.AddMousePosEvent((float)mouse_pos.x, (float)mouse_pos.y);
+            POINT pos;
+            if (::GetCursorPos(&pos) && ::ScreenToClient(bd->hWnd, &pos))
+                io.AddMousePosEvent((float)pos.x, (float)pos.y);
         }
     }
-
-    // (Optional) When using multiple viewports: call io.AddMouseViewportEvent() with the viewport the OS mouse cursor is hovering.
-    // If ImGuiBackendFlags_HasMouseHoveredViewport is not set by the backend, Dear imGui will ignore this field and infer the information using its flawed heuristic.
-    // - [X] Win32 backend correctly ignore viewports with the _NoInputs flag (here using ::WindowFromPoint with WM_NCHITTEST + HTTRANSPARENT in WndProc does that)
-    //       Some backend are not able to handle that correctly. If a backend report an hovered viewport that has the _NoInputs flag (e.g. when dragging a window
-    //       for docking, the viewport has the _NoInputs flag in order to allow us to find the viewport under), then Dear ImGui is forced to ignore the value reported
-    //       by the backend, and use its flawed heuristic to guess the viewport behind.
-    // - [X] Win32 backend correctly reports this regardless of another viewport behind focused and dragged from (we need this to find a useful drag and drop target).
-    ImGuiID mouse_viewport_id = 0;
-    if (has_mouse_screen_pos)
-        if (HWND hovered_hwnd = ::WindowFromPoint(mouse_screen_pos))
-            if (ImGuiViewport* viewport = ImGui_ImplWin32_FindViewportByPlatformHandle(platform_io, hovered_hwnd))
-                mouse_viewport_id = viewport->ID;
-    io.AddMouseViewportEvent(mouse_viewport_id);
 }
 
 // Gamepad navigation mapping
@@ -472,59 +398,25 @@ static void ImGui_ImplWin32_UpdateGamepads(ImGuiIO& io)
 #endif
 }
 
-static BOOL CALLBACK ImGui_ImplWin32_UpdateMonitors_EnumFunc(HMONITOR monitor, HDC, LPRECT, LPARAM)
-{
-    MONITORINFO info = {};
-    info.cbSize = sizeof(MONITORINFO);
-    if (!::GetMonitorInfo(monitor, &info))
-        return TRUE;
-    ImGuiPlatformMonitor imgui_monitor;
-    imgui_monitor.MainPos = ImVec2((float)info.rcMonitor.left, (float)info.rcMonitor.top);
-    imgui_monitor.MainSize = ImVec2((float)(info.rcMonitor.right - info.rcMonitor.left), (float)(info.rcMonitor.bottom - info.rcMonitor.top));
-    imgui_monitor.WorkPos = ImVec2((float)info.rcWork.left, (float)info.rcWork.top);
-    imgui_monitor.WorkSize = ImVec2((float)(info.rcWork.right - info.rcWork.left), (float)(info.rcWork.bottom - info.rcWork.top));
-    imgui_monitor.DpiScale = ImGui_ImplWin32_GetDpiScaleForMonitor(monitor);
-    imgui_monitor.PlatformHandle = (void*)monitor;
-    if (imgui_monitor.DpiScale <= 0.0f)
-        return TRUE; // Some accessibility applications are declaring virtual monitors with a DPI of 0, see #7902.
-    ImGuiPlatformIO& io = ImGui::GetPlatformIO();
-    if (info.dwFlags & MONITORINFOF_PRIMARY)
-        io.Monitors.push_front(imgui_monitor);
-    else
-        io.Monitors.push_back(imgui_monitor);
-    return TRUE;
-}
-
-static void ImGui_ImplWin32_UpdateMonitors()
-{
-    ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
-    ImGui::GetPlatformIO().Monitors.resize(0);
-    ::EnumDisplayMonitors(nullptr, nullptr, ImGui_ImplWin32_UpdateMonitors_EnumFunc, 0);
-    bd->WantUpdateMonitors = false;
-}
-
 void    ImGui_ImplWin32_NewFrame()
 {
     ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
     IM_ASSERT(bd != nullptr && "Context or backend not initialized? Did you call ImGui_ImplWin32_Init()?");
     ImGuiIO& io = ImGui::GetIO();
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
 
     // Setup display size (every frame to accommodate for window resizing)
     RECT rect = { 0, 0, 0, 0 };
     ::GetClientRect(bd->hWnd, &rect);
     io.DisplaySize = ImVec2((float)(rect.right - rect.left), (float)(rect.bottom - rect.top));
-    if (bd->WantUpdateMonitors)
-        ImGui_ImplWin32_UpdateMonitors();
 
     // Setup time step
     INT64 current_time = 0;
     ::QueryPerformanceCounter((LARGE_INTEGER*)&current_time);
-    io.DeltaTime = (float)(current_time - bd->Time) / bd->TicksPerSecond;
+    io.DeltaTime = (float)((double)(current_time - bd->Time) / (double)bd->TicksPerSecond);
     bd->Time = current_time;
 
     // Update OS mouse position
-    ImGui_ImplWin32_UpdateMouseData(io, platform_io);
+    ImGui_ImplWin32_UpdateMouseData(io);
 
     // Process workarounds for known Windows key handling issues
     ImGui_ImplWin32_ProcessKeyEventsWorkarounds(io);
@@ -729,10 +621,6 @@ static ImGuiMouseSource ImGui_ImplWin32_GetMouseSourceFromMessageExtraInfo()
 extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);                // Use ImGui::GetCurrentContext()
 extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandlerEx(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam, ImGuiIO& io); // Doesn't use ImGui::GetCurrentContext()
 
-#ifndef WM_DPICHANGED
-#define WM_DPICHANGED 0x02E0 // From Windows SDK 8.1+ headers
-#endif
-
 IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
     // Most backends don't have silent checks like this one, but we need it because WndProc are called early in CreateWindow().
@@ -767,11 +655,8 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandlerEx(HWND hwnd, UINT msg, WPA
             bd->MouseTrackedArea = area;
         }
         POINT mouse_pos = { (LONG)GET_X_LPARAM(lParam), (LONG)GET_Y_LPARAM(lParam) };
-        bool want_absolute_pos = (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) != 0;
-        if (msg == WM_MOUSEMOVE && want_absolute_pos)    // WM_MOUSEMOVE are client-relative coordinates.
-            ::ClientToScreen(hwnd, &mouse_pos);
-        if (msg == WM_NCMOUSEMOVE && !want_absolute_pos) // WM_NCMOUSEMOVE are absolute coordinates.
-            ::ScreenToClient(hwnd, &mouse_pos);
+        if (msg == WM_NCMOUSEMOVE) // WM_NCMOUSEMOVE are absolute coordinates.
+             ::ScreenToClient(hwnd, &mouse_pos);
         io.AddMouseSourceEvent(mouse_source);
         io.AddMousePosEvent((float)mouse_pos.x, (float)mouse_pos.y);
         return 0;
@@ -941,21 +826,6 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandlerEx(HWND hwnd, UINT msg, WPA
             bd->WantUpdateHasGamepad = true;
 #endif
         return 0;
-    case WM_DISPLAYCHANGE:
-        bd->WantUpdateMonitors = true;
-        return 0;
-    case WM_SETTINGCHANGE:
-        if (wParam == SPI_SETWORKAREA)
-            bd->WantUpdateMonitors = true;
-        return 0;
-    case WM_DPICHANGED:
-    {
-        // FIXME-DPI: see SDL3's WM_GETDPISCALEDSIZE handler.
-        const RECT* suggested_rect = (RECT*)lParam;
-        if (io.ConfigDpiScaleViewports)
-            ::SetWindowPos(hwnd, nullptr, suggested_rect->left, suggested_rect->top, suggested_rect->right - suggested_rect->left, suggested_rect->bottom - suggested_rect->top, SWP_NOZORDER | SWP_NOACTIVATE);
-        return 0;
-    }
     }
     return 0;
 }
@@ -1013,19 +883,13 @@ DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);
 #ifndef DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2
 #define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 (DPI_AWARENESS_CONTEXT)-4
 #endif
-typedef HRESULT(WINAPI* PFN_SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS);                             // Shcore.lib + dll, Windows 8.1+
-typedef HRESULT(WINAPI* PFN_GetDpiForMonitor)(HMONITOR, MONITOR_DPI_TYPE, UINT*, UINT*);                // Shcore.lib + dll, Windows 8.1+
-typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_SetThreadDpiAwarenessContext)(DPI_AWARENESS_CONTEXT);         // User32.lib + dll, Windows 10 v1607+ (Creators Update)
-typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_GetThreadDpiAwarenessContext)();                              // "
-typedef BOOL(WINAPI* PFN_AreDpiAwarenessContextsEqual)(DPI_AWARENESS_CONTEXT, DPI_AWARENESS_CONTEXT);   // "
+typedef HRESULT(WINAPI* PFN_SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS);                     // Shcore.lib + dll, Windows 8.1+
+typedef HRESULT(WINAPI* PFN_GetDpiForMonitor)(HMONITOR, MONITOR_DPI_TYPE, UINT*, UINT*);        // Shcore.lib + dll, Windows 8.1+
+typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_SetThreadDpiAwarenessContext)(DPI_AWARENESS_CONTEXT); // User32.lib + dll, Windows 10 v1607+ (Creators Update)
 
 // Helper function to enable DPI awareness without setting up a manifest
 void ImGui_ImplWin32_EnableDpiAwareness()
 {
-    // Make sure monitors will be updated with latest correct scaling
-    if (ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData())
-        bd->WantUpdateMonitors = true;
-
     if (_IsWindows10OrGreater())
     {
         static HINSTANCE user32_dll = ::LoadLibraryA("user32.dll"); // Reference counted per-process
@@ -1049,18 +913,6 @@ void ImGui_ImplWin32_EnableDpiAwareness()
 #endif
 }
 
-static bool ImGui_ImplWin32_IsDpiAwarenessPerMonitorAwareV2()
-{
-    if (!_IsWindows10OrGreater())
-        return false;
-    static HINSTANCE user32_dll = ::GetModuleHandleA("user32.dll");
-    PFN_GetThreadDpiAwarenessContext GetThreadDpiAwarenessContextFn = (PFN_GetThreadDpiAwarenessContext)::GetProcAddress(user32_dll, "GetThreadDpiAwarenessContext");
-    PFN_AreDpiAwarenessContextsEqual AreDpiAwarenessContextsEqualFn = (PFN_AreDpiAwarenessContextsEqual)::GetProcAddress(user32_dll, "AreDpiAwarenessContextsEqual");
-    if (GetThreadDpiAwarenessContextFn && AreDpiAwarenessContextsEqualFn)
-        return AreDpiAwarenessContextsEqualFn(GetThreadDpiAwarenessContextFn(), DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) != 0;
-    return false;
-}
-
 #if defined(_MSC_VER) && !defined(NOGDI)
 #pragma comment(lib, "gdi32")   // Link with gdi32.lib for GetDeviceCaps(). MinGW will require linking with '-lgdi32'
 #endif
@@ -1078,7 +930,7 @@ float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
         {
             GetDpiForMonitorFn((HMONITOR)monitor, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
             IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
-            return xdpi / 96.0f;
+            return (float)xdpi / 96.0f;
         }
     }
 #ifndef NOGDI
@@ -1088,7 +940,7 @@ float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
     IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
     ::ReleaseDC(nullptr, dc);
 #endif
-    return xdpi / 96.0f;
+    return (float)xdpi / 96.0f;
 }
 
 float ImGui_ImplWin32_GetDpiScaleForHwnd(void* hwnd)
@@ -1137,398 +989,6 @@ void ImGui_ImplWin32_EnableAlphaCompositing(void* hwnd)
     }
 }
 
-//---------------------------------------------------------------------------------------------------------
-// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
-// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
-// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
-//--------------------------------------------------------------------------------------------------------
-
-// Helper structure we store in the void* PlatformUserData field of each ImGuiViewport to easily retrieve our backend data.
-struct ImGui_ImplWin32_ViewportData
-{
-    HWND    Hwnd;               // Stored in ImGuiViewport::PlatformHandle + PlatformHandleRaw
-    HWND    HwndParent;
-    bool    HwndOwned;
-    DWORD   DwStyle;
-    DWORD   DwExStyle;
-
-    ImGui_ImplWin32_ViewportData() { Hwnd = HwndParent = nullptr; HwndOwned = false;  DwStyle = DwExStyle = 0; }
-    ~ImGui_ImplWin32_ViewportData() { IM_ASSERT(Hwnd == nullptr); }
-};
-
-static void ImGui_ImplWin32_GetWin32StyleFromViewportFlags(ImGuiViewportFlags flags, DWORD* out_style, DWORD* out_ex_style)
-{
-    if (flags & ImGuiViewportFlags_NoDecoration)
-        *out_style = WS_POPUP;
-    else
-        *out_style = WS_OVERLAPPEDWINDOW;
-
-    if (flags & ImGuiViewportFlags_NoTaskBarIcon)
-        *out_ex_style = WS_EX_TOOLWINDOW;
-    else
-        *out_ex_style = WS_EX_APPWINDOW;
-
-    if (flags & ImGuiViewportFlags_TopMost)
-        *out_ex_style |= WS_EX_TOPMOST;
-}
-
-static HWND ImGui_ImplWin32_GetHwndFromViewport(ImGuiViewport* viewport)
-{
-    if (viewport != nullptr)
-        return (HWND)viewport->PlatformHandle;
-    return nullptr;
-}
-
-static void ImGui_ImplWin32_AdjustWindowRect(ImGuiViewport* viewport, RECT* rect, DWORD style, DWORD ex_style)
-{
-    ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
-    if (bd->AdjustWindowRectExForDpi && bd->IsPerMonitorDpiAwareV2)
-    {
-        UINT dpi = (UINT)(viewport->DpiScale * 96.0f + 0.5f);
-        if (dpi != 0 && bd->AdjustWindowRectExForDpi(rect, style, FALSE, ex_style, dpi))
-            return;
-    }
-    ::AdjustWindowRectEx(rect, style, FALSE, ex_style);
-}
-
-static void ImGui_ImplWin32_CreateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = IM_NEW(ImGui_ImplWin32_ViewportData)();
-    viewport->PlatformUserData = vd;
-
-    // Select style and parent window
-    ImGui_ImplWin32_GetWin32StyleFromViewportFlags(viewport->Flags, &vd->DwStyle, &vd->DwExStyle);
-    vd->HwndParent = ImGui_ImplWin32_GetHwndFromViewport(viewport->ParentViewport);
-
-    // Create window
-    RECT rect = { (LONG)viewport->Pos.x, (LONG)viewport->Pos.y, (LONG)(viewport->Pos.x + viewport->Size.x), (LONG)(viewport->Pos.y + viewport->Size.y) };
-    ImGui_ImplWin32_AdjustWindowRect(viewport, &rect, vd->DwStyle, vd->DwExStyle);
-    vd->Hwnd = ::CreateWindowExW(
-        vd->DwExStyle, L"ImGui Platform", L"Untitled", vd->DwStyle,       // Style, class name, window name
-        rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,    // Window area
-        vd->HwndParent, nullptr, ::GetModuleHandle(nullptr), nullptr);          // Owner window, Menu, Instance, Param
-    vd->HwndOwned = true;
-    viewport->PlatformRequestResize = false;
-    viewport->PlatformHandle = viewport->PlatformHandleRaw = vd->Hwnd;
-
-    // Secondary viewports store their imgui context
-    ::SetPropA(vd->Hwnd, "IMGUI_CONTEXT", ImGui::GetCurrentContext());
-}
-
-static void ImGui_ImplWin32_DestroyWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
-    if (ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData)
-    {
-        if (::GetCapture() == vd->Hwnd)
-        {
-            // Transfer capture so if we started dragging from a window that later disappears, we'll still receive the MOUSEUP event.
-            ::ReleaseCapture();
-            ::SetCapture(bd->hWnd);
-        }
-        if (vd->Hwnd && vd->HwndOwned)
-            ::DestroyWindow(vd->Hwnd);
-        vd->Hwnd = nullptr;
-        IM_DELETE(vd);
-    }
-    viewport->PlatformUserData = viewport->PlatformHandle = nullptr;
-}
-
-static void ImGui_ImplWin32_ShowWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-
-    // ShowParent() even with SW_SHOWNA also brings parent to front, which is not always desirable,
-    // so we temporarily disable parenting. (#7354, #8669)
-    bool avoid_bringing_parent_to_front = vd->HwndParent != NULL && (viewport->Flags & (ImGuiViewportFlags_NoFocusOnAppearing | ImGuiViewportFlags_NoTaskBarIcon)) != 0;
-    if (avoid_bringing_parent_to_front)
-        ::SetWindowLongPtr(vd->Hwnd, GWLP_HWNDPARENT, (LONG_PTR)nullptr);
-
-    if (viewport->Flags & ImGuiViewportFlags_NoFocusOnAppearing)
-        ::ShowWindow(vd->Hwnd, SW_SHOWNA);
-    else
-        ::ShowWindow(vd->Hwnd, SW_SHOW);
-
-    // Restore
-    if (avoid_bringing_parent_to_front)
-        ::SetWindowLongPtr(vd->Hwnd, GWLP_HWNDPARENT, (LONG_PTR)vd->HwndParent);
-}
-
-static void ImGui_ImplWin32_UpdateWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-
-    // Update Win32 parent if it changed _after_ creation
-    // Unlike style settings derived from configuration flags, this is more likely to change for advanced apps that are manipulating ParentViewportID manually.
-    HWND new_parent = ImGui_ImplWin32_GetHwndFromViewport(viewport->ParentViewport);
-    if (new_parent != vd->HwndParent)
-    {
-        // Win32 windows can either have a "Parent" (for WS_CHILD window) or an "Owner" (which among other thing keeps window above its owner).
-        // Our Dear Imgui-side concept of parenting only mostly care about what Win32 call "Owner".
-        // The parent parameter of CreateWindowEx() sets up Parent OR Owner depending on WS_CHILD flag. In our case an Owner as we never use WS_CHILD.
-        // Calling ::SetParent() here would be incorrect: it will create a full child relation, alter coordinate system and clipping.
-        // Calling ::SetWindowLongPtr() with GWLP_HWNDPARENT seems correct although poorly documented.
-        // https://devblogs.microsoft.com/oldnewthing/20100315-00/?p=14613
-        vd->HwndParent = new_parent;
-        ::SetWindowLongPtr(vd->Hwnd, GWLP_HWNDPARENT, (LONG_PTR)vd->HwndParent);
-    }
-
-    // (Optional) Update Win32 style if it changed _after_ creation.
-    // Generally they won't change unless configuration flags are changed, but advanced uses (such as manually rewriting viewport flags) make this useful.
-    DWORD new_style;
-    DWORD new_ex_style;
-    ImGui_ImplWin32_GetWin32StyleFromViewportFlags(viewport->Flags, &new_style, &new_ex_style);
-
-    // Only reapply the flags that have been changed from our point of view (as other flags are being modified by Windows)
-    if (vd->DwStyle != new_style || vd->DwExStyle != new_ex_style)
-    {
-        // (Optional) Update TopMost state if it changed _after_ creation
-        bool top_most_changed = (vd->DwExStyle & WS_EX_TOPMOST) != (new_ex_style & WS_EX_TOPMOST);
-        HWND insert_after = top_most_changed ? ((viewport->Flags & ImGuiViewportFlags_TopMost) ? HWND_TOPMOST : HWND_NOTOPMOST) : 0;
-        UINT swp_flag = top_most_changed ? 0 : SWP_NOZORDER;
-
-        // Apply flags and position (since it is affected by flags)
-        vd->DwStyle = new_style;
-        vd->DwExStyle = new_ex_style;
-        ::SetWindowLong(vd->Hwnd, GWL_STYLE, vd->DwStyle);
-        ::SetWindowLong(vd->Hwnd, GWL_EXSTYLE, vd->DwExStyle);
-        RECT rect = { (LONG)viewport->Pos.x, (LONG)viewport->Pos.y, (LONG)(viewport->Pos.x + viewport->Size.x), (LONG)(viewport->Pos.y + viewport->Size.y) };
-        ImGui_ImplWin32_AdjustWindowRect(viewport, &rect, vd->DwStyle, vd->DwExStyle); // Client to Screen
-        ::SetWindowPos(vd->Hwnd, insert_after, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, swp_flag | SWP_NOACTIVATE | SWP_FRAMECHANGED);
-        ::ShowWindow(vd->Hwnd, SW_SHOWNA); // This is necessary when we alter the style
-        viewport->PlatformRequestMove = viewport->PlatformRequestResize = true;
-    }
-}
-
-static ImVec2 ImGui_ImplWin32_GetWindowPos(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    POINT pos = { 0, 0 };
-    ::ClientToScreen(vd->Hwnd, &pos);
-    return ImVec2((float)pos.x, (float)pos.y);
-}
-
-static void ImGui_ImplWin32_UpdateWin32StyleFromWindow(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    vd->DwStyle = ::GetWindowLongW(vd->Hwnd, GWL_STYLE);
-    vd->DwExStyle = ::GetWindowLongW(vd->Hwnd, GWL_EXSTYLE);
-}
-
-static void ImGui_ImplWin32_SetWindowPos(ImGuiViewport* viewport, ImVec2 pos)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    RECT rect = { (LONG)pos.x, (LONG)pos.y, (LONG)pos.x, (LONG)pos.y };
-    if (viewport->Flags & ImGuiViewportFlags_OwnedByApp)
-        ImGui_ImplWin32_UpdateWin32StyleFromWindow(viewport); // Not our window, poll style before using
-    ImGui_ImplWin32_AdjustWindowRect(viewport, &rect, vd->DwStyle, vd->DwExStyle);
-    ::SetWindowPos(vd->Hwnd, nullptr, rect.left, rect.top, 0, 0, SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE);
-}
-
-static ImVec2 ImGui_ImplWin32_GetWindowSize(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    RECT rect;
-    ::GetClientRect(vd->Hwnd, &rect);
-    return ImVec2(float(rect.right - rect.left), float(rect.bottom - rect.top));
-}
-
-static void ImGui_ImplWin32_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    RECT rect = { 0, 0, (LONG)size.x, (LONG)size.y };
-    if (viewport->Flags & ImGuiViewportFlags_OwnedByApp)
-        ImGui_ImplWin32_UpdateWin32StyleFromWindow(viewport); // Not our window, poll style before using
-    ImGui_ImplWin32_AdjustWindowRect(viewport, &rect, vd->DwStyle, vd->DwExStyle); // Client to Screen
-    ::SetWindowPos(vd->Hwnd, nullptr, 0, 0, rect.right - rect.left, rect.bottom - rect.top, SWP_NOZORDER | SWP_NOMOVE | SWP_NOACTIVATE);
-}
-
-static void ImGui_ImplWin32_SetWindowFocus(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    ::BringWindowToTop(vd->Hwnd);
-    ::SetForegroundWindow(vd->Hwnd);
-    ::SetFocus(vd->Hwnd);
-}
-
-static bool ImGui_ImplWin32_GetWindowFocus(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    return ::GetForegroundWindow() == vd->Hwnd;
-}
-
-static bool ImGui_ImplWin32_GetWindowMinimized(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    return ::IsIconic(vd->Hwnd) != 0;
-}
-
-static void ImGui_ImplWin32_SetWindowTitle(ImGuiViewport* viewport, const char* title)
-{
-    // ::SetWindowTextA() doesn't properly handle UTF-8 so we explicitely convert our string.
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    int n = ::MultiByteToWideChar(CP_UTF8, 0, title, -1, nullptr, 0);
-    ImVector<wchar_t> title_w;
-    title_w.resize(n);
-    ::MultiByteToWideChar(CP_UTF8, 0, title, -1, title_w.Data, n);
-
-    // Calling SetWindowTextW() in a project where UNICODE is not set doesn't work but there's a trick
-    // which is to pass it directly to the DefWindowProcW() handler.
-    // See: https://stackoverflow.com/questions/9410681/setwindowtextw-in-an-ansi-project
-    //::SetWindowTextW(vd->Hwnd, title_w.Data);
-    ::DefWindowProcW(vd->Hwnd, WM_SETTEXT, 0, (LPARAM)title_w.Data);
-}
-
-static void ImGui_ImplWin32_SetWindowAlpha(ImGuiViewport* viewport, float alpha)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    IM_ASSERT(alpha >= 0.0f && alpha <= 1.0f);
-    if (alpha < 1.0f)
-    {
-        DWORD ex_style = ::GetWindowLongW(vd->Hwnd, GWL_EXSTYLE) | WS_EX_LAYERED;
-        ::SetWindowLongW(vd->Hwnd, GWL_EXSTYLE, ex_style);
-        ::SetLayeredWindowAttributes(vd->Hwnd, 0, (BYTE)(255 * alpha), LWA_ALPHA);
-    }
-    else
-    {
-        DWORD ex_style = ::GetWindowLongW(vd->Hwnd, GWL_EXSTYLE) & ~WS_EX_LAYERED;
-        ::SetWindowLongW(vd->Hwnd, GWL_EXSTYLE, ex_style);
-    }
-}
-
-static float ImGui_ImplWin32_GetWindowDpiScale(ImGuiViewport* viewport)
-{
-    ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
-    IM_ASSERT(vd->Hwnd != 0);
-    return ImGui_ImplWin32_GetDpiScaleForHwnd(vd->Hwnd);
-}
-
-// FIXME-DPI: Testing DPI related ideas
-static void ImGui_ImplWin32_OnChangedViewport(ImGuiViewport* viewport)
-{
-    (void)viewport;
-#if 0
-    ImGuiStyle default_style;
-    //default_style.WindowPadding = ImVec2(0, 0);
-    //default_style.WindowBorderSize = 0.0f;
-    //default_style.ItemSpacing.y = 3.0f;
-    //default_style.FramePadding = ImVec2(0, 0);
-    default_style.ScaleAllSizes(viewport->DpiScale);
-    ImGuiStyle& style = ImGui::GetStyle();
-    style = default_style;
-#endif
-}
-
-namespace ImGui { extern ImGuiIO& GetIO(ImGuiContext*); extern ImGuiPlatformIO& GetPlatformIO(ImGuiContext*); }
-
-static LRESULT CALLBACK ImGui_ImplWin32_WndProcHandler_PlatformWindow(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
-{
-    // Allow secondary viewport WndProc to be called regardless of current context
-    ImGuiContext* ctx = (ImGuiContext*)::GetPropA(hWnd, "IMGUI_CONTEXT");
-    if (ctx == NULL)
-        return ::DefWindowProcW(hWnd, msg, wParam, lParam); // unlike ImGui_ImplWin32_WndProcHandler() we are called directly by Windows, we can't just return 0.
-
-    ImGuiIO& io = ImGui::GetIO(ctx);
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO(ctx);
-    LRESULT result = 0;
-    if (ImGui_ImplWin32_WndProcHandlerEx(hWnd, msg, wParam, lParam, io))
-        result = 1;
-    else if (ImGuiViewport* viewport = ImGui_ImplWin32_FindViewportByPlatformHandle(platform_io, hWnd))
-    {
-        switch (msg)
-        {
-        case WM_CLOSE:
-            viewport->PlatformRequestClose = true;
-            return 0; // 0 = Operating system will ignore the message and not destroy the window. We close ourselves.
-        case WM_MOVE:
-            viewport->PlatformRequestMove = true;
-            break;
-        case WM_SIZE:
-            viewport->PlatformRequestResize = true;
-            break;
-        case WM_MOUSEACTIVATE:
-            if (viewport->Flags & ImGuiViewportFlags_NoFocusOnClick)
-                result = MA_NOACTIVATE;
-            break;
-        case WM_NCHITTEST:
-            // Let mouse pass-through the window. This will allow the backend to call io.AddMouseViewportEvent() correctly. (which is optional).
-            // The ImGuiViewportFlags_NoInputs flag is set while dragging a viewport, as want to detect the window behind the one we are dragging.
-            // If you cannot easily access those viewport flags from your windowing/event code: you may manually synchronize its state e.g. in
-            // your main loop after calling UpdatePlatformWindows(). Iterate all viewports/platform windows and pass the flag to your windowing system.
-            if (viewport->Flags & ImGuiViewportFlags_NoInputs)
-                result = HTTRANSPARENT;
-            break;
-        }
-    }
-    if (result == 0)
-        result = ::DefWindowProcW(hWnd, msg, wParam, lParam);
-    return result;
-}
-
-static void ImGui_ImplWin32_InitMultiViewportSupport(bool platform_has_own_dc)
-{
-    WNDCLASSEXW wcex;
-    wcex.cbSize = sizeof(WNDCLASSEXW);
-    wcex.style = CS_HREDRAW | CS_VREDRAW | (platform_has_own_dc ? CS_OWNDC : 0);
-    wcex.lpfnWndProc = ImGui_ImplWin32_WndProcHandler_PlatformWindow;
-    wcex.cbClsExtra = 0;
-    wcex.cbWndExtra = 0;
-    wcex.hInstance = ::GetModuleHandle(nullptr);
-    wcex.hIcon = nullptr;
-    wcex.hCursor = nullptr;
-    wcex.hbrBackground = (HBRUSH)(COLOR_BACKGROUND + 1);
-    wcex.lpszMenuName = nullptr;
-    wcex.lpszClassName = L"ImGui Platform";
-    wcex.hIconSm = nullptr;
-    ::RegisterClassExW(&wcex);
-
-    ImGui_ImplWin32_UpdateMonitors();
-
-    // Register platform interface (will be coupled with a renderer interface)
-    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-    platform_io.Platform_CreateWindow = ImGui_ImplWin32_CreateWindow;
-    platform_io.Platform_DestroyWindow = ImGui_ImplWin32_DestroyWindow;
-    platform_io.Platform_ShowWindow = ImGui_ImplWin32_ShowWindow;
-    platform_io.Platform_SetWindowPos = ImGui_ImplWin32_SetWindowPos;
-    platform_io.Platform_GetWindowPos = ImGui_ImplWin32_GetWindowPos;
-    platform_io.Platform_SetWindowSize = ImGui_ImplWin32_SetWindowSize;
-    platform_io.Platform_GetWindowSize = ImGui_ImplWin32_GetWindowSize;
-    platform_io.Platform_SetWindowFocus = ImGui_ImplWin32_SetWindowFocus;
-    platform_io.Platform_GetWindowFocus = ImGui_ImplWin32_GetWindowFocus;
-    platform_io.Platform_GetWindowMinimized = ImGui_ImplWin32_GetWindowMinimized;
-    platform_io.Platform_SetWindowTitle = ImGui_ImplWin32_SetWindowTitle;
-    platform_io.Platform_SetWindowAlpha = ImGui_ImplWin32_SetWindowAlpha;
-    platform_io.Platform_UpdateWindow = ImGui_ImplWin32_UpdateWindow;
-    platform_io.Platform_GetWindowDpiScale = ImGui_ImplWin32_GetWindowDpiScale; // FIXME-DPI
-    platform_io.Platform_OnChangedViewport = ImGui_ImplWin32_OnChangedViewport; // FIXME-DPI
-
-    // Register main window handle (which is owned by the main application, not by us)
-    // This is mostly for simplicity and consistency, so that our code (e.g. mouse handling etc.) can use same logic for main and secondary viewports.
-    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
-    ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
-    ImGui_ImplWin32_ViewportData* vd = IM_NEW(ImGui_ImplWin32_ViewportData)();
-    vd->Hwnd = bd->hWnd;
-    vd->HwndOwned = false;
-    main_viewport->PlatformUserData = vd;
-}
-
-static void ImGui_ImplWin32_ShutdownMultiViewportSupport()
-{
-    ::UnregisterClassW(L"ImGui Platform", ::GetModuleHandle(nullptr));
-    ImGui::DestroyPlatformWindows();
-}
-
 //---------------------------------------------------------------------------------------------------------
 
 #if defined(__GNUC__)

backends/imgui_impl_win32.h

@@ -7,7 +7,6 @@
 //  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy VK_* values are obsolete since 1.87 and not supported since 1.91.5]
 //  [X] Platform: Gamepad support.
 //  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors). Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
-//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

backends/vulkan/glsl_shader.frag

@@ -1,7 +1,8 @@
 #version 450 core
 layout(location = 0) out vec4 fColor;
 
-layout(set=0, binding=0) uniform sampler2D sTexture;
+layout(set=0, binding=0) uniform texture2D _Texture;
+layout(set=1, binding=0) uniform sampler _Sampler;
 
 layout(location = 0) in struct {
     vec4 Color;
@@ -10,5 +11,5 @@ layout(location = 0) in struct {
 
 void main()
 {
-    fColor = In.Color * texture(sTexture, In.UV.st);
+    fColor = In.Color * texture(sampler2D(_Texture, _Sampler), In.UV.st);
 }

docs/BACKENDS.md

@@ -183,7 +183,6 @@ The Platform backends in impl_impl_XXX.cpp files contain many implementations.
   - `ImGuiBackendFlags_HasSetMousePos`: supports io.WantSetMousePos requests to reposition the OS mouse position (only used if io.ConfigNavMoveSetMousePos is set).
   - `ImGuiBackendFlags_PlatformHasViewports` supports multiple viewports. (multi-viewports only)
   - `ImGuiBackendFlags_HasMouseHoveredViewport` supports calling io.AddMouseViewportEvent() with the viewport under the mouse. IF POSSIBLE, ignore viewports with the ImGuiViewportFlags_NoInputs flag. If this cannot be done, Dear ImGui needs to use a flawed heuristic to find the viewport under mouse position, as it doesn't know about foreign windows. (multi-viewports only)
-  - `ImGuiBackendFlags_HasParentViewport` supports honoring viewport->ParentViewportId value, by applying the corresponding parent/child relation at the Platform level.
 
 **In your `ImGui_ImplXXX_NewFrame()` function:**
 - Set `io.DeltaTime` to the time elapsed (in seconds) since last frame.
@@ -256,8 +255,8 @@ void MyImGuiBackend_RenderDrawData(ImDrawData* draw_data)
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
             if (pcmd->UserCallback)
             {
-                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
-                    MyEngineSetupenderState();
+                if (pcmd->UserCallback == platform_io.DrawCallback_ResetRenderState)
+                    MyEngineSetupSenderState();
                 else
                     pcmd->UserCallback(cmd_list, pcmd);
             }

docs/SECURITY.md

@@ -0,0 +1,17 @@
+# Security Policy
+
+Dear ImGui is primarily designed for developer tools and technical applications running trusted code and trusted data. 
+
+Given that the library was not designed as a hardened security boundary against hostile or intentionally malformed inputs: 
+consider not using it in a context where a crash (through e.g. intentionally malformed inputs) could lead to privilege elevation. 
+E.g. running in a privileged process and interacting with non-privileged clients feeding code or data to Dear ImGui.
+
+Dear ImGui development efforts are focused on improving developer experience, usability, correctness, and robustness in real-world applications. 
+We will do our best to reduce e.g. crashes caused by common programmer mistakes.
+
+However, the project does not specifically focus on adversarial fuzzing scenarios, allocation-failure hardening, or highly artificial edge cases that are unlikely to occur in normal usage.
+
+## Reporting a Vulnerability
+
+Considering the above policy, most things may be reported in GitHub Issues.
+If you have a reason to disclose privately, please reach out to the contact address listed in README.

docs/TODO.txt

@@ -2,12 +2,14 @@ dear imgui
 ISSUES & TODO LIST
 
 Issue numbers (#) refer to GitHub issues listed at https://github.com/ocornut/imgui/issues/XXXX
+
 THIS LIST IS NOT WELL MAINTAINED. MOST OF THE WORK HAPPENS ON GITHUB NOWADAYS.
+
 The list below consist mostly of ideas noted down before they are requested/discussed by users (at which point they usually exist on the github issue tracker).
 It's mostly a bunch of personal notes, probably incomplete. Feel free to query if you have any questions.
 
- - doc: add a proper documentation system (maybe relying on automation? #435)
  - doc: checklist app to verify backends/integration of imgui (test inputs, rendering, callback, etc.).
+ - doc: add a proper documentation system (maybe relying on automation? #435)
  - doc/tips: tips of the day: website? applet in imgui_club?
 
  - window: preserve/restore relative focus ordering (persistent or not), and e.g. of multiple reappearing windows (#2304) -> also see docking reference to same #.
@@ -29,9 +31,9 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - window/clipping: some form of clipping when DisplaySize (or corresponding viewport) is zero.
  - window/tabbing: add a way to signify that a window or docked window requires attention (e.g. blinking title bar, trying to click behind a modal).
  - window/id_stack: add e.g. window->GetIDFromPath() with support for leading / and ../ (#1390, #331) -> model from test engine.
- ! scrolling: exposing horizontal scrolling with Shift+Wheel even when scrollbar is disabled expose lots of issues (#2424, #1463)
+
+ ! scrolling: exposing horizontal scrolling with Shift+Wheel even when scrollbar is disabled expose various issues (#2424, #1463)
  - scrolling: while holding down a scrollbar, try to keep the same contents visible (at least while not moving mouse)
- - scrolling: allow immediately effective change of scroll after Begin() if we haven't appended items yet.
  - scrolling: forward mouse wheel scrolling to parent window when at the edge of scrolling limits? (useful for listbox,tables?)
  - scrolling/style: shadows on scrollable areas to denote that there is more contents (see e.g. DaVinci Resolve ui)
 
@@ -51,38 +53,32 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - widgets: display mode: widget-label, label-widget (aligned on column or using fixed size), label-newline-tab-widget etc. (#395)
  - widgets: clean up widgets internal toward exposing everything and stabilizing imgui_internals.h.
  - widgets: add always-allow-overlap mode. This should perhaps be the default? one problem is that highlight after mouse-wheel scrolling gets deferred, makes scrolling more flickery.
- - widgets: start exposing PushItemFlag() and ImGuiItemFlags
  - widgets: alignment options in style (e.g. center Selectable, Right-Align within Button, etc.) #1260
  - widgets: activate by identifier (trigger button, focus given id)
  - widgets: custom glyph/shapes replacements for stock shapes. (also #6090 #2431 #2235 #6517)
  - widgets: coloredit: keep reporting as active when picker is on?
- - widgets: group/scalarn functions: expose more per-component information. e.g. store NextItemData.ComponentIdx set by scalarn function, groups can expose them back somehow.
+ - widgets: group/ScalarN functions: expose more per-component information. e.g. store NextItemData.ComponentIdx set by scalarn function, groups can expose them back somehow.
  - selectable: using (size.x == 0.0f) and (SelectableTextAlign.x > 0.0f) followed by SameLine() is currently not supported.
  - selectable: generic BeginSelectable()/EndSelectable() mechanism. (work out alongside range-select branch)
  - selectable: a way to visualize partial/mixed selection (e.g. parent tree node has children with mixed selection)
 
+ - input text: flag to disable live update of the user buffer (also applies to float/int text input) (#701)
  - input text: preserve scrolling when unfocused?
  - input text: reorganize event handling, allow CharFilter to modify buffers, allow multiple events? (#541)
- - input text: expose CursorPos in char filter event (#816)
- - input text: try usage idiom of using InputText with data only exposed through get/set accessors, without extraneous copy/alloc. (#3009)
- - input text: access public fields via a non-callback API e.g. InputTextGetState("xxx") that may return nullptr if not active (available in internals)
- - input text: flag to disable live update of the user buffer (also applies to float/int text input) (#701)
  - input text: hover tooltip could show unclamped text
  - input text: support for INSERT key to toggle overwrite mode. currently disabled because stb_textedit behavior is unsatisfactory on multi-line. (#2863)
  - input text: option to Tab after an Enter validation.
  - input text: add ImGuiInputTextFlags_EnterToApply? (off #218)
  - input text: easier ways to update buffer (from source char*) while owned. preserve some sort of cursor position for multi-line text.
  - input text: add discard flag (e.g. ImGuiInputTextFlags_DiscardActiveBuffer) or make it easier to clear active focus for text replacement during edition (#725)
- - input text: display bug when clicking a drag/slider after an input text in a different window has all-selected text (order dependent). actually a very old bug but no one appears to have noticed it.
  - input text: allow centering/positioning text so that ctrl+clicking Drag or Slider keeps the textual value at the same pixel position.
  - input text: decorrelate display layout from inputs with custom template - e.g. what's the easiest way to implement a nice IP/Mac address input editor?
- - input text: global callback system so user can plug in an expression evaluator easily. (#1691)
+ - input text: callback system (global) so user can plug in an expression evaluator easily. (#1691)
  - input text: force scroll to end or scroll to a given line/contents (so user can implement a log or a search feature)
  - input text: a way to preview completion (e.g. disabled text completing from the cursor)
  - input text: a side bar that could e.g. preview where errors are. probably left to the user to draw but we'd need to give them the info there.
  - input text: a way for the user to provide syntax coloring.
  - input text: Shift+TAB with ImGuiInputTextFlags_AllowTabInput could eat preceding blanks, up to tab_count.
- - input text multi-line: don't directly call AddText() which does an unnecessary vertex reserve for character count prior to clipping. and/or more line-based clipping to AddText(). and/or reorganize TextUnformatted/RenderText for more efficiency for large text (e.g TextUnformatted could clip and log separately, etc).
  - input text multi-line: support for copy/cut without selection (copy/cut current line?)
  - input text multi-line: line numbers? status bar? (follow up on #200)
  - input text multi-line: behave better when user changes input buffer while editing is active (even though it is illegal behavior). namely, the change of buffer can create a scrollbar glitch (#725)
@@ -111,11 +107,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
 !- color: the color conversion helpers/types are a mess and needs sorting out.
  - color: (api breaking) ImGui::ColorConvertXXX functions should be loose ImColorConvertXX to match imgui_internals.h
 
- - plot: full featured plot/graph api w/ scrolling, zooming etc. --> promote using ImPlot
- - (plot: deleted all other todo lines on 2023-06-28)
-
  - clipper: ability to disable the clipping through a simple flag/bool.
- - clipper: ability to run without knowing full count in advance.
  - clipper: horizontal clipping support. (#2580)
 
  - separator: expose flags (#759)
@@ -123,35 +115,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - separator: width, thickness, centering (#1643, #2657)
  - splitter: formalize the splitter idiom into an official api (we want to handle n-way split) (#319)
 
- - docking: B: ordering currently held in tab bar should be implicitly held by windows themselves (also see #2304)
- - docking: B- tab bar: the order/focus restoring code could be part of TabBar and not DockNode? (#8)
- - docking: B~ rework code to be able to lazily create tab bar instance in a single place. The _Unsorted tab flag could be replacing a trailing-counter in DockNode?
- - docking: B~ fully track windows/settings reference in dock nodes. perhaps find a representation that allows facilitate use of dock builder functions.
- - docking: B~ Unreal style document system (requires low-level controls of dockspace serialization fork/copy/delete). this is mostly working but the DockBuilderXXX api are not exposed/finished.
- - docking: B: when docking outer, perform size locking on neighbors nodes the same way we do it with splitters, so other nodes are not resized.
- - docking: B~ central node resizing behavior incorrect.
- - docking: B: changing title font/style per-window is not supported as dock nodes are created in NewFrame.
- - docking: B- dock node inside its own viewports creates 1 temporary viewport per window on startup before ditching them (doesn't affect the user nor request platform windows to be created, but unnecessary)
- - docking: B- resize sibling locking behavior may be less desirable if we merged same-axis sibling in a same node level?
- - docking: B- single visible node part of a hidden split hierarchy (OnlyNodeWithWindows != NULL) should show a normal title bar (not a tab bar)
- - docking: B~ SetNextWindowDock() calls (with conditional) -> defer everything to DockContextUpdate (repro: Documents->[X]Windows->Dock 1 elsewhere->Click Redock All
- - docking: B~ tidy up tab list popup buttons features (available with manual tab-bar, see ImGuiTabBarFlags_NoTabListPopupButton code, not used by docking nodes)
- - docking: B- SetNextWindowDockId(0) with a second Begin() in the frame will asserts
- - docking: B: resize grip drawn in host window typically appears under scrollbar.
- - docking: B: resize grip auto-resize on multiple node hierarchy doesn't make much sense or should be improved?
- - docking: B- SetNextWindowFocus() doesn't seem to apply if the window is hidden this frame, need repro (#4)
- - docking: B- resizing a dock tree small currently has glitches (overlapping collapse and close button, etc.)
- - docking: B- dpi: look at interaction with the hi-dpi and multi-dpi stuff.
- - docking: B- tab bar: appearing on first frame with a dumb layout would do less harm that not appearing? (when behind dynamic branch) or store titles + render in EndTabBar()
- - docking: B- tab bar: make selected tab always shows its full title?
- - docking: B- hide close button on single tab bar?
- - docking: B- nav: design interactions so nav controls can dock/undock
- - docking: B- dockspace: flag to lock the dock tree and/or sizes (ImGuiDockNodeFlags_Locked?)
- - docking: B- reintroduce collapsing a floating dock node. also collapsing a docked dock node!
- - docking: B- allow dragging a non-floating dock node by clicking on the title-bar-looking section (not just the collapse/menu button)
- - docking: B- option to remember undocked window size? (instead of keeping their docked size) (relate to #2104)
- - docking: C- nav: CTRL+TAB highlighting tabs shows the mismatch between focus-stack and tab-order (not visible in VS because it doesn't highlight the tabs)
- - docking: C- after a dock/undock, the Scrollbar Status update in Begin() should use an updated e.g. size_y_for_scrollbars to avoid a 1 frame scrollbar flicker.
+ - docking: merge docking branch (#2109)
 
  - tabs: "there is currently a problem because TabItem() will try to submit their own tooltip after 0.50 second, and this will have the effect of making your tooltip flicker once." -> tooltip priority work (WIP branch)
  - tabs: make EndTabBar fail if users doesn't respect BeginTabBar return value, for consistency/future-proofing.
@@ -169,22 +133,19 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - knob: rotating knob widget (#942)
  - drag float: support for reversed drags (min > max) (removed is_locked, also see fdc526e)
  - drag float: up/down axis
- - drag float: power != 0.0f with current value being outside the range keeps the value stuck.
  - drag float: added leeway on edge (e.g. a few invisible steps past the clamp limits)
 
  - combo: a way/helper to customize the combo preview (#1658) -> experimental BeginComboPreview()
  - combo/listbox: keyboard control. need InputText-like non-active focus + key handling. considering keyboard for custom listbox (pr #203)
- - listbox: multiple selection (WIP range-select branch)
  - listbox: unselect option (#1208)
- - listbox: make it easier/more natural to implement range-select (need some sort of info/ref about the last clicked/focused item that user can translate to an index?) (WIP range-select branch)
  - listbox: user may want to initial scroll to focus on the one selected value?
  - listbox: disable capturing mouse wheel if the listbox has no scrolling. (#1681)
  - listbox: scrolling should track modified selection.
  - listbox: future api should allow to enable horizontal scrolling (#2510)
 
 !- popups/menus: clarify usage of popups id, how MenuItem/Selectable closing parent popups affects the ID, etc. this is quite fishy needs improvement! (#331, #402)
- - modals: make modal title bar blink when trying to click outside the modal
- - modals: technically speaking, we could make Begin() with ImGuiWindowFlags_Modal work without involving popup. May help untangle a few things, as modals are more like regular windows than popups.
+ - modals: make modal title bar blink when trying to click outside the modal.
+ - modals: technically speaking, we could make Begin() with ImGuiWindowFlags_Modal work without involving popup. May help untangle a few things, as modals are more like regular windows than popups. (#402)
  - popups: if the popup functions took explicit ImGuiID it would allow the user to manage the scope of those ID. (#331)
  - popups: clicking outside (to close popup) and holding shouldn't drag window below.
  - popups: add variant using global identifier similar to Begin/End (#402)
@@ -226,7 +187,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - style: FramePadding could be different for up vs down (#584)
  - style: WindowPadding needs to be EVEN as the 0.5 multiplier used on this value probably have a subtle effect on clip rectangle
  - style: have a more global HSV setter (e.g. alter hue on all elements). consider replacing active/hovered by offset in HSV space? (#438, #707, #1223)
- - style: gradients fill (#1223) ~ 2 bg colors for each fill? tricky with rounded shapes and using textures for corners.
+ - style: gradients fill (#4722, #1223) ~ 2 bg colors for each fill? tricky with rounded shapes and using textures for corners.
  - style editor: color child window height expressed in multiple of line height.
 
  - log: improve logging of ArrowButton, ListBox, TabItem
@@ -242,7 +203,6 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - filters: fuzzy matches (may use code at blog.forrestthewoods.com/4cffeed33fdb)
 
  - drag and drop: focus drag target window on hold (even without open)
- - drag and drop: releasing a drop shows the "..." tooltip for one frame - since e13e598 (#1725)
  - drag and drop: drag source on a group object (would need e.g. an invisible button covering group in EndGroup) https://twitter.com/paniq/status/1121446364909535233
  - drag and drop: have some way to know when a drag begin from BeginDragDropSource() pov. (see 2018/01/11 post in #143)
  - drag and drop: allow preview tooltip to be submitted from a different place than the drag source. (#1725)
@@ -275,7 +235,6 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - font: make it easier to submit own bitmap font (same texture, another texture?). (#2127, #2575)
  - font: MemoryTTF taking ownership confusing/not obvious, maybe default should be opposite?
  - font: storing MinAdvanceX per font would allow us to skip calculating line width (under a threshold of character count) in loops looking for block width
- - font/demo: demonstrate use of ImFontGlyphRangesBuilder.
  - font/draw: vertical and/or rotated text renderer (#705) - vertical is easier clipping wise
  - font/draw: need to be able to specify wrap start position.
  - font/draw: better reserve policy for large horizontal block of text (shouldn't reserve for all clipped lines). also see #3349.
@@ -301,12 +260,11 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - nav: NavFlattened: ESC on a flattened child should select something.
  - nav: NavFlattened: broken: in typical usage scenario, the items of a fully clipped child are currently not considered to enter into a NavFlattened child.
  - nav: NavFlattened: cannot access menu-bar of a flattened child window with Alt/menu key (not a very common use case..).
- - nav: simulate right-click or context activation? (SHIFT+F10, keyboard Menu key?)
  - nav/popup: esc/enter default behavior for popups, e.g. be able to mark an "ok" or "cancel" button that would get triggered by those keys, default validation button, etc.
  - nav/treenode: left within a tree node block as a fallback (ImGuiTreeNodeFlags_NavLeftJumpsBackHere by default?)
  - nav/menus: pressing left-right on a vertically clipped menu bar tends to jump to the collapse/close buttons.
  - nav/menus: allow pressing Menu to leave a sub-menu.
- - nav/menus: a way to access the main menu bar with Alt? (currently needs CTRL+TAB) or last focused window menu bar?
+ ! nav/menus: a way to access the main menu bar with Alt? (currently needs CTRL+TAB) or last focused window menu bar?
  - nav/menus: when using the main menu bar, even though we restore focus after, the underlying window loses its title bar highlight during menu manipulation. could we prevent it?
  - nav/menus: main menu bar currently cannot restore a nullptr focus. Could save NavWindow at the time of being focused, similarly to what popup do?
  - nav/menus: Alt,Up could open the first menu (e.g. "File") currently it tends to nav into the window/collapse menu. Do do that we would need custom transition?
@@ -314,21 +272,6 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - nav/windowing: Resizing window will currently fail with certain types of resizing constraints/callback applied
  - focus: preserve ActiveId/focus stack state, e.g. when opening a menu and close it, previously selected InputText() focus gets restored (#622)
 
- - viewport: make it possible to have no main/hosting viewport (see #8268)
- - viewport: We set ImGuiViewportFlags_NoFocusOnAppearing in a way that is required for GLFW/SDL binding, but could be handled better without
-   on a custom e.g. Win32 bindings. It prevents newly dragged-out viewports from taking the focus, which makes ALT+F4 more ambiguous.
- - viewport: not focusing newly undocked viewport means clicking back on previous one doesn't bring OS window to front.
- - viewport: with platform decoration enabled, platform may force constraint (e.g. minimum size)
- - viewport: use getfocus/setfocus api to synchronize imgui<>platform focus better (e.g imgui-side ctrl-tab can focus os window, OS initial setup and alt-tab can focus imgui window etc.)
- - viewport: store per-viewport/monitor DPI in .ini file so an application reload or main window changing DPI on reload can be properly patched for.
- - viewport: implicit/fallback Debug window can hog a zombie viewport (harmless, noisy?) > could at least clear out the reference on a per session basis?
- - viewport: need to clarify how to use GetMousePos() from a user point of view.
- - viewport: could apply monitor boundaries to cliprect to coarse clip things out of monitor? (#8698)
- - platform: glfw: no support for ImGuiBackendFlags_HasMouseHoveredViewport.
- - platform: sdl: no support for ImGuiBackendFlags_HasMouseHoveredViewport. maybe we could use SDL_GetMouseFocus() / SDL_WINDOW_MOUSE_FOCUS if imgui could fallback on its heuristic when NoInputs is set
- - platform: sdl: no refresh of monitor/display (SDL doesn't seem to have an event for it).
- - platform: sdl: multi-viewport + minimized window seems to break mouse wheel events (at least under Win32).
-
  - inputs: support track pad style scrolling & slider edit.
  - inputs/io: backspace and arrows in the context of a text input could use system repeat rate.
  - inputs/io: clarify/standardize/expose repeat rate and repeat delays (#1808)
@@ -340,7 +283,6 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - misc: no way to run a root-most GetID() with ImGui:: api since there's always a Debug window in the stack. (mentioned in #2960)
  - misc: make the ImGuiCond values linear (non-power-of-two). internal storage for ImGuiWindow can use integers to combine into flags (Why?)
  - misc: PushItemFlag(): add a flag to disable keyboard capture when used with mouse? (#1682)
- - misc: use more size_t in public api?
  - misc: support for string view/range instead of char* would e.g. facilitate usage with Rust (#683, #3038, WIP string_view branch)
 
  - demo: demonstrate using PushStyleVar() in more details.
@@ -358,8 +300,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - backends: opengl: could use a single vertex buffer and glBufferSubData for uploads?
  - backends: opengl: explicitly disable GL_STENCIL_TEST in bindings.
  - backends: vulkan: viewport: support for synchronized swapping of multiple swap chains.
- - backends: bgfx: https://gist.github.com/RichardGale/6e2b74bc42b3005e08397236e4be0fd0
- - backends: emscripten: with refactored examples, we could provide a direct imgui_impl_emscripten platform layer (see eg. https://github.com/floooh/sokol-samples/blob/master/html5/imgui-emsc.cc#L42)
+ - backends: emscripten: dedicated backend? (#8178, #9120, eg. https://github.com/floooh/sokol-samples/blob/master/html5/imgui-emsc.cc#L42)
 
  - bindings: ways to use clang ast dump to generate bindings or helpers for bindings? (e.g. clang++ -Xclang -ast-dump=json imgui.h) (--> use https://github.com/dearimgui/dear_bindings)
 

examples/example_allegro5/example_allegro5.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_allegro5/main.cpp

@@ -40,7 +40,6 @@ int main(int, char**)
     ImGui::CreateContext();
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;      // Enable Docking
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();

examples/example_apple_metal/example_apple_metal.xcodeproj/project.pbxproj

@@ -7,10 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		050450AB2768052600AB6805 /* imgui_tables.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 5079822D257677DB0038A28D /* imgui_tables.cpp */; };
-		050450AD276863B000AB6805 /* QuartzCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 050450AC276863B000AB6805 /* QuartzCore.framework */; };
 		05318E0F274C397200A8DE2E /* GameController.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 05318E0E274C397200A8DE2E /* GameController.framework */; };
-		05A275442773BEA20084EF39 /* QuartzCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 05A275432773BEA20084EF39 /* QuartzCore.framework */; };
 		07A82ED82139413D0078D120 /* imgui_widgets.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 07A82ED72139413C0078D120 /* imgui_widgets.cpp */; };
 		07A82ED92139418F0078D120 /* imgui_widgets.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 07A82ED72139413C0078D120 /* imgui_widgets.cpp */; };
 		5079822E257677DB0038A28D /* imgui_tables.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 5079822D257677DB0038A28D /* imgui_tables.cpp */; };
@@ -36,11 +33,7 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
-		050450AC276863B000AB6805 /* QuartzCore.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = QuartzCore.framework; path = System/Library/Frameworks/QuartzCore.framework; sourceTree = SDKROOT; };
 		05318E0E274C397200A8DE2E /* GameController.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = GameController.framework; path = System/Library/Frameworks/GameController.framework; sourceTree = SDKROOT; };
-		05A2754027728F5B0084EF39 /* imgui_impl_metal.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = imgui_impl_metal.h; path = ../../backends/imgui_impl_metal.h; sourceTree = "<group>"; };
-		05A2754127728F5B0084EF39 /* imgui_impl_osx.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = imgui_impl_osx.h; path = ../../backends/imgui_impl_osx.h; sourceTree = "<group>"; };
-		05A275432773BEA20084EF39 /* QuartzCore.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = QuartzCore.framework; path = Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS15.2.sdk/System/Library/Frameworks/QuartzCore.framework; sourceTree = DEVELOPER_DIR; };
 		07A82ED62139413C0078D120 /* imgui_internal.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = imgui_internal.h; path = ../../imgui_internal.h; sourceTree = "<group>"; };
 		07A82ED72139413C0078D120 /* imgui_widgets.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = imgui_widgets.cpp; path = ../../imgui_widgets.cpp; sourceTree = "<group>"; };
 		5079822D257677DB0038A28D /* imgui_tables.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = imgui_tables.cpp; path = ../../imgui_tables.cpp; sourceTree = "<group>"; };
@@ -73,7 +66,6 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				05A275442773BEA20084EF39 /* QuartzCore.framework in Frameworks */,
 				8309BD8F253CCAAA0045E2A1 /* UIKit.framework in Frameworks */,
 				83BBE9E720EB46BD00295997 /* MetalKit.framework in Frameworks */,
 				83BBE9E520EB46B900295997 /* Metal.framework in Frameworks */,
@@ -84,7 +76,6 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				050450AD276863B000AB6805 /* QuartzCore.framework in Frameworks */,
 				8309BDC6253CCCFE0045E2A1 /* AppKit.framework in Frameworks */,
 				83BBE9EC20EB471700295997 /* MetalKit.framework in Frameworks */,
 				05318E0F274C397200A8DE2E /* GameController.framework in Frameworks */,
@@ -145,8 +136,6 @@
 		83BBE9E320EB46B800295997 /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
-				050450AC276863B000AB6805 /* QuartzCore.framework */,
-				05A275432773BEA20084EF39 /* QuartzCore.framework */,
 				05318E0E274C397200A8DE2E /* GameController.framework */,
 				8309BDC5253CCCFE0045E2A1 /* AppKit.framework */,
 				8309BD8E253CCAAA0045E2A1 /* UIKit.framework */,
@@ -164,9 +153,7 @@
 			isa = PBXGroup;
 			children = (
 				5079822D257677DB0038A28D /* imgui_tables.cpp */,
-				05A2754027728F5B0084EF39 /* imgui_impl_metal.h */,
 				8309BDB5253CCC9D0045E2A1 /* imgui_impl_metal.mm */,
-				05A2754127728F5B0084EF39 /* imgui_impl_osx.h */,
 				8309BDB6253CCC9D0045E2A1 /* imgui_impl_osx.mm */,
 				83BBEA0420EB54E700295997 /* imconfig.h */,
 				83BBEA0320EB54E700295997 /* imgui.cpp */,
@@ -298,7 +285,7 @@
 				83BBEA0A20EB54E700295997 /* imgui.cpp in Sources */,
 				83BBEA0820EB54E700295997 /* imgui_demo.cpp in Sources */,
 				83BBEA0620EB54E700295997 /* imgui_draw.cpp in Sources */,
-				050450AB2768052600AB6805 /* imgui_tables.cpp in Sources */,
+				5079822E257677DB0038A28D /* imgui_tables.cpp in Sources */,
 				07A82ED92139418F0078D120 /* imgui_widgets.cpp in Sources */,
 				8309BDA8253CCC080045E2A1 /* main.mm in Sources */,
 			);

examples/example_apple_metal/main.mm

@@ -60,21 +60,11 @@
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsLight();
 
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    ImGuiStyle& style = ImGui::GetStyle();
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
-
     // Setup Renderer backend
     ImGui_ImplMetal_Init(_device);
 
@@ -207,13 +197,6 @@
     // Present
     [commandBuffer presentDrawable:view.currentDrawable];
     [commandBuffer commit];
-
-    // Update and Render additional Platform Windows
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        ImGui::UpdatePlatformWindows();
-        ImGui::RenderPlatformWindowsDefault();
-    }
 }
 
 -(void)mtkView:(MTKView*)view drawableSizeWillChange:(CGSize)size

examples/example_apple_opengl2/main.mm

@@ -6,8 +6,6 @@
 // - Documentation        https://dearimgui.com/docs (same as your local docs/ folder).
 // - Introduction, links and more at the top of imgui.cpp
 
-// FIXME: Multi-viewports is not yet functional in this example. May need backend rework/coordination.
-
 #import <Cocoa/Cocoa.h>
 #import <OpenGL/gl.h>
 #import <OpenGL/glu.h>
@@ -49,21 +47,11 @@
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsLight();
 
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    ImGuiStyle& style = ImGui::GetStyle();
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
-
     // Setup Platform/Renderer backends
     ImGui_ImplOSX_Init(self);
     ImGui_ImplOpenGL2_Init();
@@ -150,13 +138,6 @@
 
     ImGui_ImplOpenGL2_RenderDrawData(draw_data);
 
-    // Update and Render additional Platform Windows
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        ImGui::UpdatePlatformWindows();
-        ImGui::RenderPlatformWindowsDefault();
-    }
-
     // Present
     [[self openGLContext] flushBuffer];
 

examples/example_glfw_metal/main.mm

@@ -44,8 +44,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -55,15 +53,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     id <MTLDevice> device = MTLCreateSystemDefaultDevice();
     id <MTLCommandQueue> commandQueue = [device newCommandQueue];
@@ -175,13 +164,6 @@ int main(int, char**)
             ImGui::Render();
             ImGui_ImplMetal_RenderDrawData(ImGui::GetDrawData(), commandBuffer, renderEncoder);
 
-            // Update and Render additional Platform Windows
-            if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-            {
-                ImGui::UpdatePlatformWindows();
-                ImGui::RenderPlatformWindowsDefault();
-            }
-
             [renderEncoder popDebugGroup];
             [renderEncoder endEncoding];
 

examples/example_glfw_opengl2/example_glfw_opengl2.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_glfw_opengl2/main.cpp

@@ -53,10 +53,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -66,15 +62,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplGlfw_InitForOpenGL(window, true);
@@ -176,17 +163,6 @@ int main(int, char**)
         ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
         //glUseProgram(last_program);
 
-        // Update and Render additional Platform Windows
-        // (Platform functions may change the current OpenGL context, so we save/restore it to make it easier to paste this code elsewhere.
-        //  For this specific demo app we could also call glfwMakeContextCurrent(window) directly)
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            GLFWwindow* backup_current_context = glfwGetCurrentContext();
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-            glfwMakeContextCurrent(backup_current_context);
-        }
-
         glfwMakeContextCurrent(window);
         glfwSwapBuffers(window);
     }

examples/example_glfw_opengl3/example_glfw_opengl3.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_glfw_opengl3/main.cpp

@@ -84,10 +84,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -97,17 +93,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-#if GLFW_VERSION_MAJOR >= 3 && GLFW_VERSION_MINOR >= 3
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-#endif
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplGlfw_InitForOpenGL(window, true);
@@ -213,17 +198,6 @@ int main(int, char**)
         glClear(GL_COLOR_BUFFER_BIT);
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
 
-        // Update and Render additional Platform Windows
-        // (Platform functions may change the current OpenGL context, so we save/restore it to make it easier to paste this code elsewhere.
-        //  For this specific demo app we could also call glfwMakeContextCurrent(window) directly)
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            GLFWwindow* backup_current_context = glfwGetCurrentContext();
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-            glfwMakeContextCurrent(backup_current_context);
-        }
-
         glfwSwapBuffers(window);
     }
 #ifdef __EMSCRIPTEN__

examples/example_glfw_vulkan/example_glfw_vulkan.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_glfw_vulkan/main.cpp

@@ -193,7 +193,8 @@ static void SetupVulkan(ImVector<const char*> instance_extensions)
     {
         VkDescriptorPoolSize pool_sizes[] =
         {
-            { VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, IMGUI_IMPL_VULKAN_MINIMUM_IMAGE_SAMPLER_POOL_SIZE },
+            { VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLED_IMAGE_POOL_SIZE },
+            { VK_DESCRIPTOR_TYPE_SAMPLER, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLER_POOL_SIZE },
         };
         VkDescriptorPoolCreateInfo pool_info = {};
         pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
@@ -389,10 +390,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -402,15 +399,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplGlfw_InitForVulkan(window, true);
@@ -525,25 +513,17 @@ int main(int, char**)
 
         // Rendering
         ImGui::Render();
-        ImDrawData* main_draw_data = ImGui::GetDrawData();
-        const bool main_is_minimized = (main_draw_data->DisplaySize.x <= 0.0f || main_draw_data->DisplaySize.y <= 0.0f);
-        wd->ClearValue.color.float32[0] = clear_color.x * clear_color.w;
-        wd->ClearValue.color.float32[1] = clear_color.y * clear_color.w;
-        wd->ClearValue.color.float32[2] = clear_color.z * clear_color.w;
-        wd->ClearValue.color.float32[3] = clear_color.w;
-        if (!main_is_minimized)
-            FrameRender(wd, main_draw_data);
-
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImDrawData* draw_data = ImGui::GetDrawData();
+        const bool is_minimized = (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f);
+        if (!is_minimized)
         {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
-        // Present Main Platform Window
-        if (!main_is_minimized)
+            wd->ClearValue.color.float32[0] = clear_color.x * clear_color.w;
+            wd->ClearValue.color.float32[1] = clear_color.y * clear_color.w;
+            wd->ClearValue.color.float32[2] = clear_color.z * clear_color.w;
+            wd->ClearValue.color.float32[3] = clear_color.w;
+            FrameRender(wd, draw_data);
             FramePresent(wd);
+        }
     }
 
     // Cleanup

examples/example_glfw_wgpu/CMakeLists.txt

@@ -146,6 +146,28 @@ else() # Native/Desktop build
     endif()
 
     if(IMGUI_WGVK_DIR)
+        find_package(Vulkan REQUIRED)
+        set(WGVK_PLATFORM_LIBS)
+        set(WGVK_PLATFORM_DEFS)
+        if(WIN32)
+            list(APPEND WGVK_PLATFORM_DEFS SUPPORT_WIN32_SURFACE=1)
+        elseif(APPLE)
+            list(APPEND WGVK_PLATFORM_DEFS SUPPORT_METAL_SURFACE=1)
+        elseif(UNIX)
+            find_package(PkgConfig QUIET)
+            pkg_check_modules(WAYLAND_CLIENT QUIET wayland-client)
+            if(WAYLAND_CLIENT_FOUND)
+                list(APPEND WGVK_PLATFORM_DEFS SUPPORT_WAYLAND_SURFACE=1)
+                list(APPEND WGVK_PLATFORM_LIBS ${WAYLAND_CLIENT_LIBRARIES})
+            endif()
+            find_package(X11 QUIET)
+            if(X11_FOUND)
+                list(APPEND WGVK_PLATFORM_DEFS SUPPORT_XLIB_SURFACE=1)
+                list(APPEND WGVK_PLATFORM_LIBS X11::X11)
+            endif()
+            list(APPEND WGVK_PLATFORM_LIBS m dl pthread)
+        endif()
+        set(LIBRARIES glfw Vulkan::Vulkan ${WGVK_PLATFORM_LIBS})
     endif()
 endif()
 
@@ -187,6 +209,7 @@ if(NOT EMSCRIPTEN) # WegGPU-Native settings
     if(IMGUI_WGVK_DIR)
         target_sources(${IMGUI_EXECUTABLE} PRIVATE ${IMGUI_WGVK_DIR}/src/wgvk.c)
         target_compile_definitions(${IMGUI_EXECUTABLE} PUBLIC "IMGUI_IMPL_WEBGPU_BACKEND_WGVK")
+        target_compile_definitions(${IMGUI_EXECUTABLE} PRIVATE ${WGVK_PLATFORM_DEFS})
         target_include_directories(${IMGUI_EXECUTABLE} PUBLIC ${IMGUI_WGVK_DIR}/include)
         if (MSVC)
            target_compile_options(${IMGUI_EXECUTABLE} PUBLIC /std:clatest /experimental:c11atomics)

examples/example_glfw_wgpu/main.cpp

@@ -87,7 +87,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();

examples/example_glut_opengl2/example_glut_opengl2.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_glut_opengl2/main.cpp

@@ -61,7 +61,6 @@ int main(int argc, char** argv)
     ImGui::CreateContext();
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();

examples/example_null/example_null.vcxproj

@@ -21,33 +21,34 @@
   <PropertyGroup Label="Globals">
     <ProjectGuid>{1A0BF63C-18EF-4BAE-A8DA-055481B11F5D}</ProjectGuid>
     <RootNamespace>example_win32_directx11</RootNamespace>
+    <WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_sdl2_directx11/example_sdl2_directx11.vcxproj

@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_sdl2_directx11/main.cpp

@@ -75,10 +75,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -88,15 +84,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL2_InitForD3D(window);
@@ -205,13 +192,6 @@ int main(int, char**)
         g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
         ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
 
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
         g_pSwapChain->Present(1, 0); // Present with vsync
         //g_pSwapChain->Present(0, 0); // Present without vsync
     }
@@ -259,16 +239,6 @@ bool CreateDeviceD3D(HWND hWnd)
     if (res != S_OK)
         return false;
 
-    // Disable DXGI's default Alt+Enter fullscreen behavior.
-    // - You are free to leave this enabled, but it will not work properly with multiple viewports.
-    // - This must be done for all windows associated to the device. Our DX11 backend does this automatically for secondary viewports that it creates.
-    IDXGIFactory* pSwapChainFactory;
-    if (SUCCEEDED(g_pSwapChain->GetParent(IID_PPV_ARGS(&pSwapChainFactory))))
-    {
-        pSwapChainFactory->MakeWindowAssociation(hWnd, DXGI_MWA_NO_ALT_ENTER);
-        pSwapChainFactory->Release();
-    }
-
     CreateRenderTarget();
     return true;
 }

examples/example_sdl2_metal/main.mm

@@ -24,21 +24,11 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;   // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;      // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;    // Enable Multi-Viewport / Platform Windows
 
     // Setup style
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsLight();
 
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    ImGuiStyle& style = ImGui::GetStyle();
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
-
     // Load Fonts
     // - If fonts are not explicitly loaded, Dear ImGui will select an embedded font: either AddFontDefaultVector() or AddFontDefaultBitmap().
     //   This selection is based on (style.FontSizeBase * style.FontScaleMain * style.FontScaleDpi) reaching a small threshold.
@@ -180,13 +170,6 @@ int main(int, char**)
             ImGui::Render();
             ImGui_ImplMetal_RenderDrawData(ImGui::GetDrawData(), commandBuffer, renderEncoder);
 
-            // Update and Render additional Platform Windows
-            if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-            {
-                ImGui::UpdatePlatformWindows();
-                ImGui::RenderPlatformWindowsDefault();
-            }
-
             [renderEncoder popDebugGroup];
             [renderEncoder endEncoding];
 

examples/example_sdl2_opengl2/example_sdl2_opengl2.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_sdl2_opengl2/main.cpp

@@ -64,10 +64,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -77,15 +73,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
@@ -187,19 +174,6 @@ int main(int, char**)
         glClear(GL_COLOR_BUFFER_BIT);
         //glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound
         ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
-
-        // Update and Render additional Platform Windows
-        // (Platform functions may change the current OpenGL context, so we save/restore it to make it easier to paste this code elsewhere.
-        //  For this specific demo app we could also call SDL_GL_MakeCurrent(window, gl_context) directly)
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            SDL_Window* backup_current_window = SDL_GL_GetCurrentWindow();
-            SDL_GLContext backup_current_context = SDL_GL_GetCurrentContext();
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-            SDL_GL_MakeCurrent(backup_current_window, backup_current_context);
-        }
-
         SDL_GL_SwapWindow(window);
     }
 

examples/example_sdl2_opengl3/example_sdl2_opengl3.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_sdl2_opengl3/main.cpp

@@ -104,10 +104,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -117,15 +113,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
@@ -234,19 +221,6 @@ int main(int, char**)
         glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
         glClear(GL_COLOR_BUFFER_BIT);
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
-
-        // Update and Render additional Platform Windows
-        // (Platform functions may change the current OpenGL context, so we save/restore it to make it easier to paste this code elsewhere.
-        //  For this specific demo app we could also call SDL_GL_MakeCurrent(window, gl_context) directly)
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            SDL_Window* backup_current_window = SDL_GL_GetCurrentWindow();
-            SDL_GLContext backup_current_context = SDL_GL_GetCurrentContext();
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-            SDL_GL_MakeCurrent(backup_current_window, backup_current_context);
-        }
-
         SDL_GL_SwapWindow(window);
     }
 #ifdef __EMSCRIPTEN__

examples/example_sdl2_sdlrenderer2/example_sdl2_sdlrenderer2.vcxproj

@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
@@ -184,4 +184,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>

examples/example_sdl2_sdlrenderer2/main.cpp

@@ -66,7 +66,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -76,8 +75,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL2_InitForSDLRenderer(window, renderer);

examples/example_sdl2_vulkan/example_sdl2_vulkan.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
@@ -187,4 +187,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>

examples/example_sdl2_vulkan/main.cpp

@@ -184,7 +184,8 @@ static void SetupVulkan(ImVector<const char*> instance_extensions)
     {
         VkDescriptorPoolSize pool_sizes[] =
         {
-            { VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, IMGUI_IMPL_VULKAN_MINIMUM_IMAGE_SAMPLER_POOL_SIZE },
+            { VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLED_IMAGE_POOL_SIZE },
+            { VK_DESCRIPTOR_TYPE_SAMPLER, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLER_POOL_SIZE },
         };
         VkDescriptorPoolCreateInfo pool_info = {};
         pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
@@ -395,10 +396,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoTaskBarIcons;
-    //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoMerge;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -408,15 +405,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL2_InitForVulkan(window);
@@ -540,25 +528,17 @@ int main(int, char**)
 
         // Rendering
         ImGui::Render();
-        ImDrawData* main_draw_data = ImGui::GetDrawData();
-        const bool main_is_minimized = (main_draw_data->DisplaySize.x <= 0.0f || main_draw_data->DisplaySize.y <= 0.0f);
-        wd->ClearValue.color.float32[0] = clear_color.x * clear_color.w;
-        wd->ClearValue.color.float32[1] = clear_color.y * clear_color.w;
-        wd->ClearValue.color.float32[2] = clear_color.z * clear_color.w;
-        wd->ClearValue.color.float32[3] = clear_color.w;
-        if (!main_is_minimized)
-            FrameRender(wd, main_draw_data);
-
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImDrawData* draw_data = ImGui::GetDrawData();
+        const bool is_minimized = (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f);
+        if (!is_minimized)
         {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
-        // Present Main Platform Window
-        if (!main_is_minimized)
+            wd->ClearValue.color.float32[0] = clear_color.x * clear_color.w;
+            wd->ClearValue.color.float32[1] = clear_color.y * clear_color.w;
+            wd->ClearValue.color.float32[2] = clear_color.z * clear_color.w;
+            wd->ClearValue.color.float32[3] = clear_color.w;
+            FrameRender(wd, draw_data);
             FramePresent(wd);
+        }
     }
 
     // Cleanup

examples/example_sdl2_wgpu/CMakeLists.txt

@@ -141,6 +141,28 @@ else() # Native/Desktop build
     endif()
 
     if(IMGUI_WGVK_DIR)
+        find_package(Vulkan REQUIRED)
+        set(WGVK_PLATFORM_LIBS)
+        set(WGVK_PLATFORM_DEFS)
+        if(WIN32)
+            list(APPEND WGVK_PLATFORM_DEFS SUPPORT_WIN32_SURFACE=1)
+        elseif(APPLE)
+            list(APPEND WGVK_PLATFORM_DEFS SUPPORT_METAL_SURFACE=1)
+        elseif(UNIX)
+            find_package(PkgConfig QUIET)
+            pkg_check_modules(WAYLAND_CLIENT QUIET wayland-client)
+            if(WAYLAND_CLIENT_FOUND)
+                list(APPEND WGVK_PLATFORM_DEFS SUPPORT_WAYLAND_SURFACE=1)
+                list(APPEND WGVK_PLATFORM_LIBS ${WAYLAND_CLIENT_LIBRARIES})
+            endif()
+            find_package(X11 QUIET)
+            if(X11_FOUND)
+                list(APPEND WGVK_PLATFORM_DEFS SUPPORT_XLIB_SURFACE=1)
+                list(APPEND WGVK_PLATFORM_LIBS X11::X11)
+            endif()
+            list(APPEND WGVK_PLATFORM_LIBS m dl pthread)
+        endif()
+        set(LIBRARIES glfw Vulkan::Vulkan ${WGVK_PLATFORM_LIBS})
     endif()
 
 endif()
@@ -183,6 +205,7 @@ if(NOT EMSCRIPTEN) # WegGPU-Native settings
     if(IMGUI_WGVK_DIR)
         target_sources(${IMGUI_EXECUTABLE} PRIVATE ${IMGUI_WGVK_DIR}/src/wgvk.c)
         target_compile_definitions(${IMGUI_EXECUTABLE} PUBLIC "IMGUI_IMPL_WEBGPU_BACKEND_WGVK")
+        target_compile_definitions(${IMGUI_EXECUTABLE} PRIVATE ${WGVK_PLATFORM_DEFS})
         target_include_directories(${IMGUI_EXECUTABLE} PUBLIC ${IMGUI_WGVK_DIR}/include)
         if (MSVC)
            target_compile_options(${IMGUI_EXECUTABLE} PUBLIC /std:clatest /experimental:c11atomics)

examples/example_sdl3_directx11/example_sdl3_directx11.vcxproj

@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_sdl3_directx11/main.cpp

@@ -66,10 +66,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -79,15 +75,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL3_InitForD3D(window);
@@ -199,13 +186,6 @@ int main(int, char**)
         g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
         ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
 
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
         g_pSwapChain->Present(1, 0); // Present with vsync
         //g_pSwapChain->Present(0, 0); // Present without vsync
     }
@@ -254,16 +234,6 @@ bool CreateDeviceD3D(HWND hWnd)
     if (res != S_OK)
         return false;
 
-    // Disable DXGI's default Alt+Enter fullscreen behavior.
-    // - You are free to leave this enabled, but it will not work properly with multiple viewports.
-    // - This must be done for all windows associated to the device. Our DX11 backend does this automatically for secondary viewports that it creates.
-    IDXGIFactory* pSwapChainFactory;
-    if (SUCCEEDED(g_pSwapChain->GetParent(IID_PPV_ARGS(&pSwapChainFactory))))
-    {
-        pSwapChainFactory->MakeWindowAssociation(hWnd, DXGI_MWA_NO_ALT_ENTER);
-        pSwapChainFactory->Release();
-    }
-
     CreateRenderTarget();
     return true;
 }

examples/example_sdl3_opengl3/example_sdl3_opengl3.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_sdl3_opengl3/main.cpp

@@ -94,10 +94,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -107,15 +103,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL3_InitForOpenGL(window, gl_context);
@@ -227,19 +214,6 @@ int main(int, char**)
         glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
         glClear(GL_COLOR_BUFFER_BIT);
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
-
-        // Update and Render additional Platform Windows
-        // (Platform functions may change the current OpenGL context, so we save/restore it to make it easier to paste this code elsewhere.
-        //  For this specific demo app we could also call SDL_GL_MakeCurrent(window, gl_context) directly)
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            SDL_Window* backup_current_window = SDL_GL_GetCurrentWindow();
-            SDL_GLContext backup_current_context = SDL_GL_GetCurrentContext();
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-            SDL_GL_MakeCurrent(backup_current_window, backup_current_context);
-        }
-
         SDL_GL_SwapWindow(window);
     }
 #ifdef __EMSCRIPTEN__

examples/example_sdl3_sdlgpu3/example_sdl3_sdlgpu3.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
@@ -186,4 +186,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>

examples/example_sdl3_sdlgpu3/main.cpp

@@ -68,8 +68,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -79,15 +77,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL3_InitForSDLGPU(window);
@@ -223,13 +212,6 @@ int main(int, char**)
             SDL_EndGPURenderPass(render_pass);
         }
 
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
         // Submit the command buffer
         SDL_SubmitGPUCommandBuffer(command_buffer);
     }

examples/example_sdl3_sdlrenderer3/example_sdl3_sdlrenderer3.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_sdl3_sdlrenderer3/main.cpp

@@ -56,7 +56,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -66,8 +65,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    //io.ConfigDpiScaleFonts = true;        // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    //io.ConfigDpiScaleViewports = true;    // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL3_InitForSDLRenderer(window, renderer);

examples/example_sdl3_vulkan/example_sdl3_vulkan.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_sdl3_vulkan/main.cpp

@@ -186,7 +186,8 @@ static void SetupVulkan(ImVector<const char*> instance_extensions)
     {
         VkDescriptorPoolSize pool_sizes[] =
         {
-            { VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, IMGUI_IMPL_VULKAN_MINIMUM_IMAGE_SAMPLER_POOL_SIZE },
+            { VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLED_IMAGE_POOL_SIZE },
+            { VK_DESCRIPTOR_TYPE_SAMPLER, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLER_POOL_SIZE },
         };
         VkDescriptorPoolCreateInfo pool_info = {};
         pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
@@ -394,10 +395,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoTaskBarIcons;
-    //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoMerge;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -407,15 +404,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplSDL3_InitForVulkan(window);
@@ -542,25 +530,17 @@ int main(int, char**)
 
         // Rendering
         ImGui::Render();
-        ImDrawData* main_draw_data = ImGui::GetDrawData();
-        const bool main_is_minimized = (main_draw_data->DisplaySize.x <= 0.0f || main_draw_data->DisplaySize.y <= 0.0f);
-        wd->ClearValue.color.float32[0] = clear_color.x * clear_color.w;
-        wd->ClearValue.color.float32[1] = clear_color.y * clear_color.w;
-        wd->ClearValue.color.float32[2] = clear_color.z * clear_color.w;
-        wd->ClearValue.color.float32[3] = clear_color.w;
-        if (!main_is_minimized)
-            FrameRender(wd, main_draw_data);
-
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImDrawData* draw_data = ImGui::GetDrawData();
+        const bool is_minimized = (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f);
+        if (!is_minimized)
         {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
-        // Present Main Platform Window
-        if (!main_is_minimized)
+            wd->ClearValue.color.float32[0] = clear_color.x * clear_color.w;
+            wd->ClearValue.color.float32[1] = clear_color.y * clear_color.w;
+            wd->ClearValue.color.float32[2] = clear_color.z * clear_color.w;
+            wd->ClearValue.color.float32[3] = clear_color.w;
+            FrameRender(wd, draw_data);
             FramePresent(wd);
+        }
     }
 
     // Cleanup

examples/example_sdl3_wgpu/CMakeLists.txt

@@ -141,6 +141,28 @@ else() # Native/Desktop build
     endif()
 
     if(IMGUI_WGVK_DIR)
+        find_package(Vulkan REQUIRED)
+        set(WGVK_PLATFORM_LIBS)
+        set(WGVK_PLATFORM_DEFS)
+        if(WIN32)
+            list(APPEND WGVK_PLATFORM_DEFS SUPPORT_WIN32_SURFACE=1)
+        elseif(APPLE)
+            list(APPEND WGVK_PLATFORM_DEFS SUPPORT_METAL_SURFACE=1)
+        elseif(UNIX)
+            find_package(PkgConfig QUIET)
+            pkg_check_modules(WAYLAND_CLIENT QUIET wayland-client)
+            if(WAYLAND_CLIENT_FOUND)
+                list(APPEND WGVK_PLATFORM_DEFS SUPPORT_WAYLAND_SURFACE=1)
+                list(APPEND WGVK_PLATFORM_LIBS ${WAYLAND_CLIENT_LIBRARIES})
+            endif()
+            find_package(X11 QUIET)
+            if(X11_FOUND)
+                list(APPEND WGVK_PLATFORM_DEFS SUPPORT_XLIB_SURFACE=1)
+                list(APPEND WGVK_PLATFORM_LIBS X11::X11)
+            endif()
+            list(APPEND WGVK_PLATFORM_LIBS m dl pthread)
+        endif()
+        set(LIBRARIES glfw Vulkan::Vulkan ${WGVK_PLATFORM_LIBS})
     endif()
 endif()
 
@@ -182,6 +204,7 @@ if(NOT EMSCRIPTEN) # WegGPU-Native settings
     if(IMGUI_WGVK_DIR)
         target_sources(${IMGUI_EXECUTABLE} PRIVATE ${IMGUI_WGVK_DIR}/src/wgvk.c)
         target_compile_definitions(${IMGUI_EXECUTABLE} PUBLIC "IMGUI_IMPL_WEBGPU_BACKEND_WGVK")
+        target_compile_definitions(${IMGUI_EXECUTABLE} PRIVATE ${WGVK_PLATFORM_DEFS})
         target_include_directories(${IMGUI_EXECUTABLE} PUBLIC ${IMGUI_WGVK_DIR}/include)
         if (MSVC)
            target_compile_options(${IMGUI_EXECUTABLE} PUBLIC /std:clatest /experimental:c11atomics)

examples/example_win32_directx10/example_win32_directx10.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_win32_directx10/main.cpp

@@ -57,10 +57,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -70,15 +66,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplWin32_Init(hwnd);
@@ -190,13 +177,6 @@ int main(int, char**)
         g_pd3dDevice->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
         ImGui_ImplDX10_RenderDrawData(ImGui::GetDrawData());
 
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
         // Present
         HRESULT hr = g_pSwapChain->Present(1, 0);   // Present with vsync
         //HRESULT hr = g_pSwapChain->Present(0, 0); // Present without vsync
@@ -216,6 +196,7 @@ int main(int, char**)
 }
 
 // Helper functions
+
 bool CreateDeviceD3D(HWND hWnd)
 {
     // Setup swap chain
@@ -244,16 +225,6 @@ bool CreateDeviceD3D(HWND hWnd)
     if (res != S_OK)
         return false;
 
-    // Disable DXGI's default Alt+Enter fullscreen behavior.
-    // - You are free to leave this enabled, but it will not work properly with multiple viewports.
-    // - This must be done for all windows associated to the device. Our DX11 backend does this automatically for secondary viewports that it creates.
-    IDXGIFactory* pSwapChainFactory;
-    if (SUCCEEDED(g_pSwapChain->GetParent(IID_PPV_ARGS(&pSwapChainFactory))))
-    {
-        pSwapChainFactory->MakeWindowAssociation(hWnd, DXGI_MWA_NO_ALT_ENTER);
-        pSwapChainFactory->Release();
-    }
-
     CreateRenderTarget();
     return true;
 }

examples/example_win32_directx11/example_win32_directx11.vcxproj

@@ -21,33 +21,34 @@
   <PropertyGroup Label="Globals">
     <ProjectGuid>{9F316E83-5AE5-4939-A723-305A94F48005}</ProjectGuid>
     <RootNamespace>example_win32_directx11</RootNamespace>
+    <WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_win32_directx11/main.cpp

@@ -57,12 +57,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
-    //io.ConfigDockingAlwaysTabBar = true;
-    //io.ConfigDockingTransparentPayload = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -72,15 +66,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplWin32_Init(hwnd);
@@ -192,13 +177,6 @@ int main(int, char**)
         g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
         ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
 
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
         // Present
         HRESULT hr = g_pSwapChain->Present(1, 0);   // Present with vsync
         //HRESULT hr = g_pSwapChain->Present(0, 0); // Present without vsync
@@ -218,6 +196,7 @@ int main(int, char**)
 }
 
 // Helper functions
+
 bool CreateDeviceD3D(HWND hWnd)
 {
     // Setup swap chain
@@ -248,16 +227,6 @@ bool CreateDeviceD3D(HWND hWnd)
     if (res != S_OK)
         return false;
 
-    // Disable DXGI's default Alt+Enter fullscreen behavior.
-    // - You are free to leave this enabled, but it will not work properly with multiple viewports.
-    // - This must be done for all windows associated to the device. Our DX11 backend does this automatically for secondary viewports that it creates.
-    IDXGIFactory* pSwapChainFactory;
-    if (SUCCEEDED(g_pSwapChain->GetParent(IID_PPV_ARGS(&pSwapChainFactory))))
-    {
-        pSwapChainFactory->MakeWindowAssociation(hWnd, DXGI_MWA_NO_ALT_ENTER);
-        pSwapChainFactory->Release();
-    }
-
     CreateRenderTarget();
     return true;
 }

examples/example_win32_directx12/main.cpp

@@ -137,10 +137,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -150,15 +146,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplWin32_Init(hwnd);
@@ -298,14 +285,6 @@ int main(int, char**)
         g_pd3dCommandList->Close();
 
         g_pd3dCommandQueue->ExecuteCommandLists(1, (ID3D12CommandList* const*)&g_pd3dCommandList);
-
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
         g_pd3dCommandQueue->Signal(g_fence, ++g_fenceLastSignaledValue);
         frameCtx->FenceValue = g_fenceLastSignaledValue;
 
@@ -331,6 +310,7 @@ int main(int, char**)
 }
 
 // Helper functions
+
 bool CreateDeviceD3D(HWND hWnd)
 {
     // Setup swap chain

examples/example_win32_directx9/example_win32_directx9.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_win32_directx9/main.cpp

@@ -55,10 +55,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigViewportsNoAutoMerge = true;
-    //io.ConfigViewportsNoTaskBarIcon = true;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -68,15 +64,6 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplWin32_Init(hwnd);
@@ -200,14 +187,6 @@ int main(int, char**)
             ImGui_ImplDX9_RenderDrawData(ImGui::GetDrawData());
             g_pd3dDevice->EndScene();
         }
-
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
         HRESULT result = g_pd3dDevice->Present(nullptr, nullptr, nullptr, nullptr);
         if (result == D3DERR_DEVICELOST)
             g_DeviceLost = true;
@@ -226,6 +205,7 @@ int main(int, char**)
 }
 
 // Helper functions
+
 bool CreateDeviceD3D(HWND hWnd)
 {
     if ((g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)) == nullptr)

examples/example_win32_opengl3/example_win32_opengl3.vcxproj

@@ -28,27 +28,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_win32_opengl3/main.cpp

@@ -33,42 +33,6 @@ void CleanupDeviceWGL(HWND hWnd, WGL_WindowData* data);
 void ResetDeviceWGL();
 LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
 
-// Support function for multi-viewports
-// Unlike most other backend combination, we need specific hooks to combine Win32+OpenGL.
-// We could in theory decide to support Win32-specific code in OpenGL backend via e.g. an hypothetical ImGui_ImplOpenGL3_InitForRawWin32().
-static void Hook_Renderer_CreateWindow(ImGuiViewport* viewport)
-{
-    assert(viewport->RendererUserData == NULL);
-
-    WGL_WindowData* data = IM_NEW(WGL_WindowData);
-    CreateDeviceWGL((HWND)viewport->PlatformHandle, data);
-    viewport->RendererUserData = data;
-}
-
-static void Hook_Renderer_DestroyWindow(ImGuiViewport* viewport)
-{
-    if (viewport->RendererUserData != NULL)
-    {
-        WGL_WindowData* data = (WGL_WindowData*)viewport->RendererUserData;
-        CleanupDeviceWGL((HWND)viewport->PlatformHandle, data);
-        IM_DELETE(data);
-        viewport->RendererUserData = NULL;
-    }
-}
-
-static void Hook_Platform_RenderWindow(ImGuiViewport* viewport, void*)
-{
-    // Activate the platform window DC in the OpenGL rendering context
-    if (WGL_WindowData* data = (WGL_WindowData*)viewport->RendererUserData)
-        wglMakeCurrent(data->hDC, g_hRC);
-}
-
-static void Hook_Renderer_SwapBuffers(ImGuiViewport* viewport, void*)
-{
-    if (WGL_WindowData* data = (WGL_WindowData*)viewport->RendererUserData)
-        ::SwapBuffers(data->hDC);
-}
-
 // Main code
 int main(int, char**)
 {
@@ -101,8 +65,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;   // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;    // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;       // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;     // Enable Multi-Viewport / Platform Windows
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -112,34 +74,11 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplWin32_InitForOpenGL(hwnd);
     ImGui_ImplOpenGL3_Init();
 
-    // Win32+GL needs specific hooks for viewport, as there are specific things needed to tie Win32 and GL api.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
-        IM_ASSERT(platform_io.Renderer_CreateWindow == NULL);
-        IM_ASSERT(platform_io.Renderer_DestroyWindow == NULL);
-        IM_ASSERT(platform_io.Renderer_SwapBuffers == NULL);
-        IM_ASSERT(platform_io.Platform_RenderWindow == NULL);
-        platform_io.Renderer_CreateWindow = Hook_Renderer_CreateWindow;
-        platform_io.Renderer_DestroyWindow = Hook_Renderer_DestroyWindow;
-        platform_io.Renderer_SwapBuffers = Hook_Renderer_SwapBuffers;
-        platform_io.Platform_RenderWindow = Hook_Platform_RenderWindow;
-    }
-
     // Load Fonts
     // - If fonts are not explicitly loaded, Dear ImGui will select an embedded font: either AddFontDefaultVector() or AddFontDefaultBitmap().
     //   This selection is based on (style.FontSizeBase * style.FontScaleMain * style.FontScaleDpi) reaching a small threshold.
@@ -234,16 +173,6 @@ int main(int, char**)
         glClear(GL_COLOR_BUFFER_BIT);
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
 
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-
-            // Restore the OpenGL rendering context to the main window DC, since platform windows might have changed it.
-            wglMakeCurrent(g_MainWindow.hDC, g_hRC);
-        }
-
         // Present
         ::SwapBuffers(g_MainWindow.hDC);
     }

examples/example_win32_vulkan/example_win32_vulkan.vcxproj

@@ -21,33 +21,34 @@
   <PropertyGroup Label="Globals">
     <ProjectGuid>{0A1E32DF-E0F4-4CCE-B3DC-9644C503BD88}</ProjectGuid>
     <RootNamespace>example_win32_directx11</RootNamespace>
+    <WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">

examples/example_win32_vulkan/main.cpp

@@ -182,7 +182,8 @@ static void SetupVulkan(ImVector<const char*> instance_extensions)
     {
         VkDescriptorPoolSize pool_sizes[] =
         {
-            { VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, IMGUI_IMPL_VULKAN_MINIMUM_IMAGE_SAMPLER_POOL_SIZE },
+            { VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLED_IMAGE_POOL_SIZE },
+            { VK_DESCRIPTOR_TYPE_SAMPLER, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLER_POOL_SIZE },
         };
         VkDescriptorPoolCreateInfo pool_info = {};
         pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
@@ -339,16 +340,6 @@ static void FramePresent(ImGui_ImplVulkanH_Window* wd)
 
 LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
 
-// FIXME: This code would ideally be inside imgui_impl_win32.cpp, it would create a dependency on Vulkan headers in imgui_impl_win32.cpp
-static int ImGui_ImplWin32_CreateVkSurface(ImGuiViewport* viewport, ImU64 vk_instance, const void* vk_allocator, ImU64* out_vk_surface)
-{
-    VkWin32SurfaceCreateInfoKHR createInfo = {};
-    createInfo.sType = VK_STRUCTURE_TYPE_WIN32_SURFACE_CREATE_INFO_KHR;
-    createInfo.hwnd = (HWND)viewport->PlatformHandleRaw;
-    createInfo.hinstance = ::GetModuleHandle(nullptr);
-    return (int)vkCreateWin32SurfaceKHR((VkInstance)vk_instance, &createInfo, (VkAllocationCallbacks*)vk_allocator, (VkSurfaceKHR*)out_vk_surface);
-}
-
 // Main code
 int main(int, char**)
 {
@@ -392,10 +383,6 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
-    //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoTaskBarIcons;
-    //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoMerge;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -405,20 +392,9 @@ int main(int, char**)
     ImGuiStyle& style = ImGui::GetStyle();
     style.ScaleAllSizes(main_scale);        // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
     style.FontScaleDpi = main_scale;        // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
-    io.ConfigDpiScaleFonts = true;          // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    io.ConfigDpiScaleViewports = true;      // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
-    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
-    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-    {
-        style.WindowRounding = 0.0f;
-        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-    }
 
     // Setup Platform/Renderer backends
     ImGui_ImplWin32_Init(hwnd);
-    ImGui::GetPlatformIO().Platform_CreateVkSurface = ImGui_ImplWin32_CreateVkSurface;
-
     ImGui_ImplVulkan_InitInfo init_info = {};
     //init_info.ApiVersion = VK_API_VERSION_1_3;              // Pass in your value of VkApplicationInfo::apiVersion, otherwise will default to header version.
     init_info.Instance = g_Instance;
@@ -521,25 +497,17 @@ int main(int, char**)
 
         // Rendering
         ImGui::Render();
-        ImDrawData* main_draw_data = ImGui::GetDrawData();
-        const bool main_is_minimized = (main_draw_data->DisplaySize.x <= 0.0f || main_draw_data->DisplaySize.y <= 0.0f);
-        wd->ClearValue.color.float32[0] = clear_color.x * clear_color.w;
-        wd->ClearValue.color.float32[1] = clear_color.y * clear_color.w;
-        wd->ClearValue.color.float32[2] = clear_color.z * clear_color.w;
-        wd->ClearValue.color.float32[3] = clear_color.w;
-        if (!main_is_minimized)
-            FrameRender(wd, main_draw_data);
-
-        // Update and Render additional Platform Windows
-        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImDrawData* draw_data = ImGui::GetDrawData();
+        const bool is_minimized = (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f);
+        if (!is_minimized)
         {
-            ImGui::UpdatePlatformWindows();
-            ImGui::RenderPlatformWindowsDefault();
-        }
-
-        // Present Main Platform Window
-        if (!main_is_minimized)
+            wd->ClearValue.color.float32[0] = clear_color.x * clear_color.w;
+            wd->ClearValue.color.float32[1] = clear_color.y * clear_color.w;
+            wd->ClearValue.color.float32[2] = clear_color.z * clear_color.w;
+            wd->ClearValue.color.float32[3] = clear_color.w;
+            FrameRender(wd, draw_data);
             FramePresent(wd);
+        }
     }
 
     // Cleanup

examples/imgui_examples.sln

@@ -3,12 +3,12 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.2.32616.157
 MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example_win32_directx11", "example_win32_directx11\example_win32_directx11.vcxproj", "{9F316E83-5AE5-4939-A723-305A94F48005}"
+EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example_win32_directx9", "example_win32_directx9\example_win32_directx9.vcxproj", "{4165A294-21F2-44CA-9B38-E3F935ABADF5}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example_win32_directx10", "example_win32_directx10\example_win32_directx10.vcxproj", "{345A953E-A004-4648-B442-DC5F9F11068C}"
 EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example_win32_directx11", "example_win32_directx11\example_win32_directx11.vcxproj", "{9F316E83-5AE5-4939-A723-305A94F48005}"
-EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example_win32_directx12", "example_win32_directx12\example_win32_directx12.vcxproj", "{B4CF9797-519D-4AFE-A8F4-5141A6B521D3}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example_glfw_opengl2", "example_glfw_opengl2\example_glfw_opengl2.vcxproj", "{9CDA7840-B7A5-496D-A527-E95571496D18}"

imgui.h

@@ -1,4 +1,4 @@
-// dear imgui, v1.92.7
+// dear imgui, v1.92.8
 // (headers)
 
 // Help:
@@ -29,12 +29,10 @@
 
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
-#define IMGUI_VERSION       "1.92.7"
-#define IMGUI_VERSION_NUM   19270
+#define IMGUI_VERSION       "1.92.8"
+#define IMGUI_VERSION_NUM   19280
 #define IMGUI_HAS_TABLE             // Added BeginTable() - from IMGUI_VERSION_NUM >= 18000
 #define IMGUI_HAS_TEXTURES          // Added ImGuiBackendFlags_RendererHasTextures - from IMGUI_VERSION_NUM >= 19198
-#define IMGUI_HAS_VIEWPORT          // In 'docking' WIP branch.
-#define IMGUI_HAS_DOCK              // In 'docking' WIP branch.
 
 /*
 
@@ -48,14 +46,14 @@ Index of this file:
 // [SECTION] Helpers: Debug log, Memory allocations macros, ImVector<>
 // [SECTION] ImGuiStyle
 // [SECTION] ImGuiIO
-// [SECTION] Misc data structures (ImGuiInputTextCallbackData, ImGuiSizeCallbackData, ImGuiWindowClass, ImGuiPayload)
+// [SECTION] Misc data structures (ImGuiInputTextCallbackData, ImGuiSizeCallbackData, ImGuiPayload)
 // [SECTION] Helpers (ImGuiOnceUponAFrame, ImGuiTextFilter, ImGuiTextBuffer, ImGuiStorage, ImGuiListClipper, Math Operators, ImColor)
 // [SECTION] Multi-Select API flags and structures (ImGuiMultiSelectFlags, ImGuiMultiSelectIO, ImGuiSelectionRequest, ImGuiSelectionBasicStorage, ImGuiSelectionExternalStorage)
 // [SECTION] Drawing API (ImDrawCallback, ImDrawCmd, ImDrawIdx, ImDrawVert, ImDrawChannel, ImDrawListSplitter, ImDrawFlags, ImDrawListFlags, ImDrawList, ImDrawData)
 // [SECTION] Texture API (ImTextureFormat, ImTextureStatus, ImTextureRect, ImTextureData)
 // [SECTION] Font API (ImFontConfig, ImFontGlyph, ImFontGlyphRangesBuilder, ImFontAtlasFlags, ImFontAtlas, ImFontBaked, ImFont)
 // [SECTION] Viewports (ImGuiViewportFlags, ImGuiViewport)
-// [SECTION] ImGuiPlatformIO + other Platform Dependent Interfaces (ImGuiPlatformMonitor, ImGuiPlatformImeData)
+// [SECTION] ImGuiPlatformIO + other Platform Dependent Interfaces (ImGuiPlatformImeData)
 // [SECTION] Obsolete functions and types
 
 */
@@ -199,9 +197,8 @@ struct ImGuiListClipper;            // Helper to manually clip large list of ite
 struct ImGuiMultiSelectIO;          // Structure to interact with a BeginMultiSelect()/EndMultiSelect() block
 struct ImGuiOnceUponAFrame;         // Helper for running a block of code not more than once a frame
 struct ImGuiPayload;                // User data payload for drag and drop operations
-struct ImGuiPlatformIO;             // Interface between platform/renderer backends and ImGui (e.g. Clipboard, IME, Multi-Viewport support). Extends ImGuiIO.
+struct ImGuiPlatformIO;             // Interface between platform/renderer backends and ImGui (e.g. Clipboard, IME hooks). Extends ImGuiIO. In docking branch, this gets extended to support multi-viewports.
 struct ImGuiPlatformImeData;        // Platform IME data for io.PlatformSetImeDataFn() function.
-struct ImGuiPlatformMonitor;        // Multi-viewport support: user-provided bounds for each connected monitor/display. Used when positioning popups and tooltips to avoid them straddling monitors
 struct ImGuiSelectionBasicStorage;  // Optional helper to store multi-selection state + apply multi-selection requests.
 struct ImGuiSelectionExternalStorage;//Optional helper to apply multi-selection requests to existing randomly accessible storage.
 struct ImGuiSelectionRequest;       // A selection request (stored in ImGuiMultiSelectIO)
@@ -213,8 +210,7 @@ struct ImGuiTableSortSpecs;         // Sorting specifications for a table (often
 struct ImGuiTableColumnSortSpecs;   // Sorting specification for one column of a table
 struct ImGuiTextBuffer;             // Helper to hold and append into a text buffer (~string builder)
 struct ImGuiTextFilter;             // Helper to parse and apply text filters (e.g. "aaaaa[,bbbbb][,ccccc]")
-struct ImGuiViewport;               // A Platform Window (always 1 unless multi-viewport are enabled. One per platform window to output to). In the future may represent Platform Monitor
-struct ImGuiWindowClass;            // Window class (rare/advanced uses: provide hints to the platform backend via altered viewport flags and parent/child info)
+struct ImGuiViewport;               // A Platform Window (always only one in 'master' branch), in the future may represent Platform Monitor
 
 // Enumerations
 // - We don't use strongly typed enums much because they add constraints (can't extend in private code, can't store typed in bit fields, extra casting on iteration)
@@ -250,7 +246,6 @@ typedef int ImGuiChildFlags;        // -> enum ImGuiChildFlags_      // Flags: f
 typedef int ImGuiColorEditFlags;    // -> enum ImGuiColorEditFlags_  // Flags: for ColorEdit4(), ColorPicker4() etc.
 typedef int ImGuiConfigFlags;       // -> enum ImGuiConfigFlags_     // Flags: for io.ConfigFlags
 typedef int ImGuiComboFlags;        // -> enum ImGuiComboFlags_      // Flags: for BeginCombo()
-typedef int ImGuiDockNodeFlags;     // -> enum ImGuiDockNodeFlags_   // Flags: for DockSpace()
 typedef int ImGuiDragDropFlags;     // -> enum ImGuiDragDropFlags_   // Flags: for BeginDragDropSource(), AcceptDragDropPayload()
 typedef int ImGuiFocusedFlags;      // -> enum ImGuiFocusedFlags_    // Flags: for IsWindowFocused()
 typedef int ImGuiHoveredFlags;      // -> enum ImGuiHoveredFlags_    // Flags: for IsItemHovered(), IsWindowHovered() etc.
@@ -471,12 +466,10 @@ namespace ImGui
     IMGUI_API bool          IsWindowFocused(ImGuiFocusedFlags flags=0); // is current window focused? or its root/child, depending on flags. see flags for options.
     IMGUI_API bool          IsWindowHovered(ImGuiHoveredFlags flags=0); // is current window hovered and hoverable (e.g. not blocked by a popup/modal)? See ImGuiHoveredFlags_ for options. IMPORTANT: If you are trying to check whether your mouse should be dispatched to Dear ImGui or to your underlying app, you should not use this function! Use the 'io.WantCaptureMouse' boolean for that! Refer to FAQ entry "How can I tell whether to dispatch mouse/keyboard to Dear ImGui or my application?" for details.
     IMGUI_API ImDrawList*   GetWindowDrawList();                        // get draw list associated to the current window, to append your own drawing primitives
-    IMGUI_API float         GetWindowDpiScale();                        // get DPI scale currently associated to the current window's viewport.
     IMGUI_API ImVec2        GetWindowPos();                             // get current window position in screen space (IT IS UNLIKELY YOU EVER NEED TO USE THIS. Consider always using GetCursorScreenPos() and GetContentRegionAvail() instead)
     IMGUI_API ImVec2        GetWindowSize();                            // get current window size (IT IS UNLIKELY YOU EVER NEED TO USE THIS. Consider always using GetCursorScreenPos() and GetContentRegionAvail() instead)
     IMGUI_API float         GetWindowWidth();                           // get current window width (IT IS UNLIKELY YOU EVER NEED TO USE THIS). Shortcut for GetWindowSize().x.
     IMGUI_API float         GetWindowHeight();                          // get current window height (IT IS UNLIKELY YOU EVER NEED TO USE THIS). Shortcut for GetWindowSize().y.
-    IMGUI_API ImGuiViewport*GetWindowViewport();                        // get viewport currently associated to the current window.
 
     // Window manipulation
     // - Prefer using SetNextXXX functions (before Begin) rather that SetXXX functions (after Begin).
@@ -488,7 +481,6 @@ namespace ImGui
     IMGUI_API void          SetNextWindowFocus();                                                       // set next window to be focused / top-most. call before Begin()
     IMGUI_API void          SetNextWindowScroll(const ImVec2& scroll);                                  // set next window scrolling value (use < 0.0f to not affect a given axis).
     IMGUI_API void          SetNextWindowBgAlpha(float alpha);                                          // set next window background color alpha. helper to easily override the Alpha component of ImGuiCol_WindowBg/ChildBg/PopupBg. you may also use ImGuiWindowFlags_NoBackground.
-    IMGUI_API void          SetNextWindowViewport(ImGuiID viewport_id);                                 // set next window viewport
     IMGUI_API void          SetWindowPos(const ImVec2& pos, ImGuiCond cond = 0);                        // (not recommended) set current window position - call within Begin()/End(). prefer using SetNextWindowPos(), as this may incur tearing and side-effects.
     IMGUI_API void          SetWindowSize(const ImVec2& size, ImGuiCond cond = 0);                      // (not recommended) set current window size - call within Begin()/End(). set to ImVec2(0, 0) to force an auto-fit. prefer using SetNextWindowSize(), as this may incur tearing and minor side-effects.
     IMGUI_API void          SetWindowCollapsed(bool collapsed, ImGuiCond cond = 0);                     // (not recommended) set current window collapsed state. prefer using SetNextWindowCollapsed().
@@ -965,34 +957,6 @@ namespace ImGui
     IMGUI_API bool          TabItemButton(const char* label, ImGuiTabItemFlags flags = 0);      // create a Tab behaving like a button. return true when clicked. cannot be selected in the tab bar.
     IMGUI_API void          SetTabItemClosed(const char* tab_or_docked_window_label);           // notify TabBar or Docking system of a closed tab/window ahead (useful to reduce visual flicker on reorderable tab bars). For tab-bar: call after BeginTabBar() and before Tab submissions. Otherwise call with a window name.
 
-    // Docking
-    // - Read https://github.com/ocornut/imgui/wiki/Docking for details.
-    // - Enable with io.ConfigFlags |= ImGuiConfigFlags_DockingEnable.
-    // - You can use many Docking facilities without calling any API.
-    //   - Drag from window title bar or their tab to dock/undock. Hold SHIFT to disable docking.
-    //   - Drag from window menu button (upper-left button) to undock an entire node (all windows).
-    //   - When io.ConfigDockingWithShift == true, you instead need to hold SHIFT to enable docking.
-    // - DockSpaceOverViewport:
-    //   - This is a helper to create an invisible window covering a viewport, then submit a DockSpace() into it.
-    //   - Most applications can simply call DockSpaceOverViewport() once to allow docking windows into e.g. the edge of your screen.
-    //     e.g. ImGui::NewFrame(); ImGui::DockSpaceOverViewport();                                                   // Create a dockspace in main viewport.
-    //      or: ImGui::NewFrame(); ImGui::DockSpaceOverViewport(0, nullptr, ImGuiDockNodeFlags_PassthruCentralNode); // Create a dockspace in main viewport, central node is transparent.
-    // - Dockspaces:
-    //   - A dockspace is an explicit dock node within an existing window.
-    //   - IMPORTANT: Dockspaces need to be submitted _before_ any window they can host. Submit them early in your frame!
-    //   - IMPORTANT: Dockspaces need to be kept alive if hidden, otherwise windows docked into it will be undocked.
-    //     If you have e.g. multiple tabs with a dockspace inside each tab: submit the non-visible dockspaces with ImGuiDockNodeFlags_KeepAliveOnly.
-    //   - See 'Demo->Examples->Dockspace' or 'Demo->Examples->Documents' for more detailed demos.
-    // - Programmatic docking:
-    //   - There is no public API yet other than the very limited SetNextWindowDockID() function. Sorry for that!
-    //   - Read https://github.com/ocornut/imgui/wiki/Docking for examples of how to use current internal API.
-    IMGUI_API ImGuiID       DockSpace(ImGuiID dockspace_id, const ImVec2& size = ImVec2(0, 0), ImGuiDockNodeFlags flags = 0, const ImGuiWindowClass* window_class = NULL);
-    IMGUI_API ImGuiID       DockSpaceOverViewport(ImGuiID dockspace_id = 0, const ImGuiViewport* viewport = NULL, ImGuiDockNodeFlags flags = 0, const ImGuiWindowClass* window_class = NULL);
-    IMGUI_API void          SetNextWindowDockID(ImGuiID dock_id, ImGuiCond cond = 0);           // set next window dock id
-    IMGUI_API void          SetNextWindowClass(const ImGuiWindowClass* window_class);           // set next window class (control docking compatibility + provide hints to platform backend via custom viewport flags and platform parent/child relationship)
-    IMGUI_API ImGuiID       GetWindowDockID();                                                  // get dock id of current window, or 0 if not associated to any docking node.
-    IMGUI_API bool          IsWindowDocked();                                                   // is current window docked into another window?
-
     // Logging/Capture
     // - All text output from the interface can be captured into tty/file/clipboard. By default, tree nodes are automatically opened during logging.
     IMGUI_API void          LogToTTY(int auto_open_depth = -1);                                 // start logging to tty (stdout)
@@ -1068,8 +1032,8 @@ namespace ImGui
     IMGUI_API ImGuiViewport* GetMainViewport();                                                 // return primary/default viewport. This can never be NULL.
 
     // Background/Foreground Draw Lists
-    IMGUI_API ImDrawList*   GetBackgroundDrawList(ImGuiViewport* viewport = NULL);              // get background draw list for the given viewport or viewport associated to the current window. this draw list will be the first rendering one. Useful to quickly draw shapes/text behind dear imgui contents.
-    IMGUI_API ImDrawList*   GetForegroundDrawList(ImGuiViewport* viewport = NULL);              // get foreground draw list for the given viewport or viewport associated to the current window. this draw list will be the top-most rendered one. Useful to quickly draw shapes/text over dear imgui contents.
+    IMGUI_API ImDrawList*   GetBackgroundDrawList();                                            // this draw list will be the first rendered one. Useful to quickly draw shapes/text behind dear imgui contents.
+    IMGUI_API ImDrawList*   GetForegroundDrawList();                                            // this draw list will be the last rendered one. Useful to quickly draw shapes/text over dear imgui contents.
 
     // Miscellaneous Utilities
     IMGUI_API bool          IsRectVisible(const ImVec2& size);                                  // test if rectangle (of given size, starting from cursor position) is visible / not clipped.
@@ -1128,10 +1092,11 @@ namespace ImGui
     // Inputs Utilities: Key/Input Ownership [BETA]
     // - One common use case would be to allow your items to disable standard inputs behaviors such
     //   as Tab or Alt key handling, Mouse Wheel scrolling, etc.
-    //   e.g. Button(...); SetItemKeyOwner(ImGuiKey_MouseWheelY); to make hovering/activating a button disable wheel for scrolling.
+    //   e.g. `Button(...); if (SetItemKeyOwner(ImGuiKey_MouseWheelY)) { ... }` to make hovering/activating a button disable wheel for scrolling.
     // - Reminder ImGuiKey enum include access to mouse buttons and gamepad, so key ownership can apply to them.
+    // - The return value of SetItemKeyOwner() says if ownership has been requested for the item, which is a shortcut to calling yet non-public TestKeyOwner() function.
     // - Many related features are still in imgui_internal.h. For instance, most IsKeyXXX()/IsMouseXXX() functions have an owner-id-aware version.
-    IMGUI_API void          SetItemKeyOwner(ImGuiKey key);                                      // Set key owner to last item ID if it is hovered or active. Equivalent to 'if (IsItemHovered() || IsItemActive()) { SetKeyOwner(key, GetItemID());'.
+    IMGUI_API bool          SetItemKeyOwner(ImGuiKey key);                                      // Set key owner to last item ID if it is hovered or active. Return true when ownership has been set. Roughly equivalent to 'if (TestKeyOwner(key, GetItemID()) && (IsItemHovered() || IsItemActive())) { SetKeyOwner(key, GetItemID());'. 
 
     // Inputs Utilities: Mouse
     // - To refer to a mouse button, you may use named enums in your code e.g. ImGuiMouseButton_Left, ImGuiMouseButton_Right.
@@ -1191,15 +1156,6 @@ namespace ImGui
     IMGUI_API void*         MemAlloc(size_t size);
     IMGUI_API void          MemFree(void* ptr);
 
-    // (Optional) Platform/OS interface for multi-viewport support
-    // Read comments around the ImGuiPlatformIO structure for more details.
-    // Note: You may use GetWindowViewport() to get the current viewport of the current window.
-    IMGUI_API void          UpdatePlatformWindows();                                // call in main loop. will call CreateWindow/ResizeWindow/etc. platform functions for each secondary viewport, and DestroyWindow for each inactive viewport.
-    IMGUI_API void          RenderPlatformWindowsDefault(void* platform_render_arg = NULL, void* renderer_render_arg = NULL); // call in main loop. will call RenderWindow/SwapBuffers platform functions for each secondary viewport which doesn't have the ImGuiViewportFlags_Minimized flag set. May be reimplemented by user for custom rendering needs.
-    IMGUI_API void          DestroyPlatformWindows();                               // call DestroyWindow platform functions for all viewports. call from backend Shutdown() if you need to close platform windows before imgui shutdown. otherwise will be called by DestroyContext().
-    IMGUI_API ImGuiViewport* FindViewportByID(ImGuiID viewport_id);                 // this is a helper for backends.
-    IMGUI_API ImGuiViewport* FindViewportByPlatformHandle(void* platform_handle);   // this is a helper for backends. the type platform_handle is decided by the backend (e.g. HWND, MyWindow*, GLFWwindow* etc.)
-
 } // namespace ImGui
 
 //-----------------------------------------------------------------------------
@@ -1230,13 +1186,11 @@ enum ImGuiWindowFlags_
     ImGuiWindowFlags_NoNavInputs            = 1 << 16,  // No keyboard/gamepad navigation within the window
     ImGuiWindowFlags_NoNavFocus             = 1 << 17,  // No focusing toward this window with keyboard/gamepad navigation (e.g. skipped by Ctrl+Tab)
     ImGuiWindowFlags_UnsavedDocument        = 1 << 18,  // Display a dot next to the title. When used in a tab/docking context, tab is selected when clicking the X + closure is not assumed (will wait for user to stop submitting the tab). Otherwise closure is assumed when pressing the X, so if you keep submitting the tab may reappear at end of tab bar.
-    ImGuiWindowFlags_NoDocking              = 1 << 19,  // Disable docking of this window
     ImGuiWindowFlags_NoNav                  = ImGuiWindowFlags_NoNavInputs | ImGuiWindowFlags_NoNavFocus,
     ImGuiWindowFlags_NoDecoration           = ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoCollapse,
     ImGuiWindowFlags_NoInputs               = ImGuiWindowFlags_NoMouseInputs | ImGuiWindowFlags_NoNavInputs | ImGuiWindowFlags_NoNavFocus,
 
     // [Internal]
-    ImGuiWindowFlags_DockNodeHost           = 1 << 23,  // Don't use! For internal use by Begin()/NewFrame()
     ImGuiWindowFlags_ChildWindow            = 1 << 24,  // Don't use! For internal use by BeginChild()
     ImGuiWindowFlags_Tooltip                = 1 << 25,  // Don't use! For internal use by BeginTooltip()
     ImGuiWindowFlags_Popup                  = 1 << 26,  // Don't use! For internal use by BeginPopup()
@@ -1448,7 +1402,7 @@ enum ImGuiTabBarFlags_
     ImGuiTabBarFlags_DrawSelectedOverline           = 1 << 6,   // Draw selected overline markers over selected tab
 
     // Fitting/Resize policy
-    ImGuiTabBarFlags_FittingPolicyMixed             = 1 << 7,   // Shrink down tabs when they don't fit, until width is style.TabMinWidthShrink, then enable scrolling buttons.
+    ImGuiTabBarFlags_FittingPolicyMixed             = 1 << 7,   // Shrink down tabs when they don't fit, until width is style.TabMinWidthShrink, then enable scrolling. Setting TabMinWidthShrink to FLT_MAX makes this behave like ImGuiTabBarFlags_FittingPolicyScroll.
     ImGuiTabBarFlags_FittingPolicyShrink            = 1 << 8,   // Shrink down tabs when they don't fit
     ImGuiTabBarFlags_FittingPolicyScroll            = 1 << 9,   // Enable scrolling buttons when tabs don't fit
     ImGuiTabBarFlags_FittingPolicyMask_             = ImGuiTabBarFlags_FittingPolicyMixed | ImGuiTabBarFlags_FittingPolicyShrink | ImGuiTabBarFlags_FittingPolicyScroll,
@@ -1482,7 +1436,7 @@ enum ImGuiFocusedFlags_
     ImGuiFocusedFlags_RootWindow                    = 1 << 1,   // Test from root window (top most parent of the current hierarchy)
     ImGuiFocusedFlags_AnyWindow                     = 1 << 2,   // Return true if any window is focused. Important: If you are trying to tell how to dispatch your low-level inputs, do NOT use this. Use 'io.WantCaptureMouse' instead! Please read the FAQ!
     ImGuiFocusedFlags_NoPopupHierarchy              = 1 << 3,   // Do not consider popup hierarchy (do not treat popup emitter as parent of popup) (when used with _ChildWindows or _RootWindow)
-    ImGuiFocusedFlags_DockHierarchy                 = 1 << 4,   // Consider docking hierarchy (treat dockspace host as parent of docked window) (when used with _ChildWindows or _RootWindow)
+    //ImGuiFocusedFlags_DockHierarchy               = 1 << 4,   // Consider docking hierarchy (treat dockspace host as parent of docked window) (when used with _ChildWindows or _RootWindow)
     ImGuiFocusedFlags_RootAndChildWindows           = ImGuiFocusedFlags_RootWindow | ImGuiFocusedFlags_ChildWindows,
 };
 
@@ -1496,7 +1450,7 @@ enum ImGuiHoveredFlags_
     ImGuiHoveredFlags_RootWindow                    = 1 << 1,   // IsWindowHovered() only: Test from root window (top most parent of the current hierarchy)
     ImGuiHoveredFlags_AnyWindow                     = 1 << 2,   // IsWindowHovered() only: Return true if any window is hovered
     ImGuiHoveredFlags_NoPopupHierarchy              = 1 << 3,   // IsWindowHovered() only: Do not consider popup hierarchy (do not treat popup emitter as parent of popup) (when used with _ChildWindows or _RootWindow)
-    ImGuiHoveredFlags_DockHierarchy                 = 1 << 4,   // IsWindowHovered() only: Consider docking hierarchy (treat dockspace host as parent of docked window) (when used with _ChildWindows or _RootWindow)
+    //ImGuiHoveredFlags_DockHierarchy               = 1 << 4,   // IsWindowHovered() only: Consider docking hierarchy (treat dockspace host as parent of docked window) (when used with _ChildWindows or _RootWindow)
     ImGuiHoveredFlags_AllowWhenBlockedByPopup       = 1 << 5,   // Return true even if a popup window is normally blocking access to this item/window
     //ImGuiHoveredFlags_AllowWhenBlockedByModal     = 1 << 6,   // Return true even if a modal popup window is normally blocking access to this item/window. FIXME-TODO: Unavailable yet.
     ImGuiHoveredFlags_AllowWhenBlockedByActiveItem  = 1 << 7,   // Return true even if an active item is blocking access to this item/window. Useful for Drag and Drop patterns.
@@ -1526,27 +1480,6 @@ enum ImGuiHoveredFlags_
     ImGuiHoveredFlags_NoSharedDelay                 = 1 << 17,  // IsItemHovered() only: Disable shared delay system where moving from one item to the next keeps the previous timer for a short time (standard for tooltips with long delays)
 };
 
-// Flags for ImGui::DockSpace(), shared/inherited by child nodes.
-// (Some flags can be applied to individual nodes directly)
-// FIXME-DOCK: Also see ImGuiDockNodeFlagsPrivate_ which may involve using the WIP and internal DockBuilder api.
-enum ImGuiDockNodeFlags_
-{
-    ImGuiDockNodeFlags_None                         = 0,
-    ImGuiDockNodeFlags_KeepAliveOnly                = 1 << 0,   //       // Don't display the dockspace node but keep it alive. Windows docked into this dockspace node won't be undocked.
-    //ImGuiDockNodeFlags_NoCentralNode              = 1 << 1,   //       // Disable Central Node (the node which can stay empty)
-    ImGuiDockNodeFlags_NoDockingOverCentralNode     = 1 << 2,   //       // Disable docking over the Central Node, which will be always kept empty.
-    ImGuiDockNodeFlags_PassthruCentralNode          = 1 << 3,   //       // Enable passthru dockspace: 1) DockSpace() will render a ImGuiCol_WindowBg background covering everything excepted the Central Node when empty. Meaning the host window should probably use SetNextWindowBgAlpha(0.0f) prior to Begin() when using this. 2) When Central Node is empty: let inputs pass-through + won't display a DockingEmptyBg background. See demo for details.
-    ImGuiDockNodeFlags_NoDockingSplit               = 1 << 4,   //       // Disable other windows/nodes from splitting this node.
-    ImGuiDockNodeFlags_NoResize                     = 1 << 5,   // Saved // Disable resizing node using the splitter/separators. Useful with programmatically setup dockspaces.
-    ImGuiDockNodeFlags_AutoHideTabBar               = 1 << 6,   //       // Tab bar will automatically hide when there is a single window in the dock node.
-    ImGuiDockNodeFlags_NoUndocking                  = 1 << 7,   //       // Disable undocking this node.
-
-#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    ImGuiDockNodeFlags_NoSplit                      = ImGuiDockNodeFlags_NoDockingSplit, // Renamed in 1.90
-    ImGuiDockNodeFlags_NoDockingInCentralNode       = ImGuiDockNodeFlags_NoDockingOverCentralNode, // Renamed in 1.90
-#endif
-};
-
 // Flags for ImGui::BeginDragDropSource(), ImGui::AcceptDragDropPayload()
 enum ImGuiDragDropFlags_
 {
@@ -1781,21 +1714,12 @@ enum ImGuiConfigFlags_
     ImGuiConfigFlags_NoMouseCursorChange    = 1 << 5,   // Instruct backend to not alter mouse cursor shape and visibility. Use if the backend cursor changes are interfering with yours and you don't want to use SetMouseCursor() to change mouse cursor. You may want to honor requests from imgui by reading GetMouseCursor() yourself instead.
     ImGuiConfigFlags_NoKeyboard             = 1 << 6,   // Instruct dear imgui to disable keyboard inputs and interactions. This is done by ignoring keyboard events and clearing existing states.
 
-    // [BETA] Docking
-    ImGuiConfigFlags_DockingEnable          = 1 << 7,   // Docking enable flags.
-
-    // [BETA] Viewports
-    // When using viewports it is recommended that your default value for ImGuiCol_WindowBg is opaque (Alpha=1.0) so transition to a viewport won't be noticeable.
-    ImGuiConfigFlags_ViewportsEnable        = 1 << 10,  // Viewport enable flags (require both ImGuiBackendFlags_PlatformHasViewports + ImGuiBackendFlags_RendererHasViewports set by the respective backends)
-
     // [Unused] User storage (to allow your backend/engine to communicate to code that may be shared between multiple projects. Those flags are NOT used by core Dear ImGui)
     ImGuiConfigFlags_IsSRGB                 = 1 << 20,  // Application is SRGB-aware.
     ImGuiConfigFlags_IsTouchScreen          = 1 << 21,  // Application is using a touch screen instead of a mouse.
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     ImGuiConfigFlags_NavEnableSetMousePos   = 1 << 2,   // [moved/renamed in 1.91.4] -> use bool io.ConfigNavMoveSetMousePos
     ImGuiConfigFlags_NavNoCaptureKeyboard   = 1 << 3,   // [moved/renamed in 1.91.4] -> use bool io.ConfigNavCaptureKeyboard
-    ImGuiConfigFlags_DpiEnableScaleFonts    = 1 << 14,  // [moved/renamed in 1.92.0] -> use bool io.ConfigDpiScaleFonts
-    ImGuiConfigFlags_DpiEnableScaleViewports= 1 << 15,  // [moved/renamed in 1.92.0] -> use bool io.ConfigDpiScaleViewports
 #endif
 };
 
@@ -1808,12 +1732,6 @@ enum ImGuiBackendFlags_
     ImGuiBackendFlags_HasSetMousePos        = 1 << 2,   // Backend Platform supports io.WantSetMousePos requests to reposition the OS mouse position (only used if io.ConfigNavMoveSetMousePos is set).
     ImGuiBackendFlags_RendererHasVtxOffset  = 1 << 3,   // Backend Renderer supports ImDrawCmd::VtxOffset. This enables output of large meshes (64K+ vertices) while still using 16-bit indices.
     ImGuiBackendFlags_RendererHasTextures   = 1 << 4,   // Backend Renderer supports ImTextureData requests to create/update/destroy textures. This enables incremental texture updates and texture reloads. See https://github.com/ocornut/imgui/blob/master/docs/BACKENDS.md for instructions on how to upgrade your custom backend.
-
-    // [BETA] Multi-Viewports
-    ImGuiBackendFlags_RendererHasViewports  = 1 << 10,  // Backend Renderer supports multiple viewports.
-    ImGuiBackendFlags_PlatformHasViewports  = 1 << 11,  // Backend Platform supports multiple viewports.
-    ImGuiBackendFlags_HasMouseHoveredViewport=1 << 12,  // Backend Platform supports calling io.AddMouseViewportEvent() with the viewport under the mouse. IF POSSIBLE, ignore viewports with the ImGuiViewportFlags_NoInputs flag (Win32 backend, GLFW 3.30+ backend can do this, SDL backend cannot). If this cannot be done, Dear ImGui needs to use a flawed heuristic to find the viewport under.
-    ImGuiBackendFlags_HasParentViewport     = 1 << 13,  // Backend Platform supports honoring viewport->ParentViewport/ParentViewportId value, by applying the corresponding parent/child relation at the Platform level.
 };
 
 // Enumeration for PushStyleColor() / PopStyleColor()
@@ -1838,6 +1756,7 @@ enum ImGuiCol_
     ImGuiCol_ScrollbarGrabHovered,
     ImGuiCol_ScrollbarGrabActive,
     ImGuiCol_CheckMark,             // Checkbox tick and RadioButton circle
+    ImGuiCol_CheckboxSelectedBg,    // Checkbox background when Selected, otherwise use FrameBg
     ImGuiCol_SliderGrab,
     ImGuiCol_SliderGrabActive,
     ImGuiCol_Button,
@@ -1860,8 +1779,6 @@ enum ImGuiCol_
     ImGuiCol_TabDimmed,             // Tab background, when tab-bar is unfocused & tab is unselected
     ImGuiCol_TabDimmedSelected,     // Tab background, when tab-bar is unfocused & tab is selected
     ImGuiCol_TabDimmedSelectedOverline,//..horizontal overline, when tab-bar is unfocused & tab is selected
-    ImGuiCol_DockingPreview,        // Preview overlay color when about to docking something
-    ImGuiCol_DockingEmptyBg,        // Background color for empty node (e.g. CentralNode with no window docked into it)
     ImGuiCol_PlotLines,
     ImGuiCol_PlotLinesHovered,
     ImGuiCol_PlotHistogram,
@@ -1881,6 +1798,7 @@ enum ImGuiCol_
     ImGuiCol_NavWindowingHighlight, // Highlight window when using Ctrl+Tab
     ImGuiCol_NavWindowingDimBg,     // Darken/colorize entire screen behind the Ctrl+Tab window list, when active
     ImGuiCol_ModalWindowDimBg,      // Darken/colorize entire screen behind a modal window, when one is active
+    ImGuiCol_WindowShadow,          // Window shadows
     ImGuiCol_COUNT,
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
@@ -1937,13 +1855,13 @@ enum ImGuiStyleVar_
     ImGuiStyleVar_TableAngledHeadersTextAlign,// ImVec2  TableAngledHeadersTextAlign
     ImGuiStyleVar_TreeLinesSize,            // float     TreeLinesSize
     ImGuiStyleVar_TreeLinesRounding,        // float     TreeLinesRounding
+    ImGuiStyleVar_DragDropTargetRounding,   // float     DragDropTargetRounding
     ImGuiStyleVar_ButtonTextAlign,          // ImVec2    ButtonTextAlign
     ImGuiStyleVar_SelectableTextAlign,      // ImVec2    SelectableTextAlign
     ImGuiStyleVar_SeparatorSize,            // float     SeparatorSize
     ImGuiStyleVar_SeparatorTextBorderSize,  // float     SeparatorTextBorderSize
     ImGuiStyleVar_SeparatorTextAlign,       // ImVec2    SeparatorTextAlign
     ImGuiStyleVar_SeparatorTextPadding,     // ImVec2    SeparatorTextPadding
-    ImGuiStyleVar_DockingSeparatorSize,     // float     DockingSeparatorSize
     ImGuiStyleVar_COUNT
 };
 
@@ -2405,7 +2323,7 @@ struct ImGuiStyle
     float       TabBorderSize;              // Thickness of border around tabs.
     float       TabMinWidthBase;            // Minimum tab width, to make tabs larger than their contents. TabBar buttons are not affected.
     float       TabMinWidthShrink;          // Minimum tab width after shrinking, when using ImGuiTabBarFlags_FittingPolicyMixed policy.
-    float       TabCloseButtonMinWidthSelected;     // -1: always visible. 0.0f: visible when hovered. >0.0f: visible when hovered if minimum width.
+    float       TabCloseButtonMinWidthSelected;     // -1: always visible. 0.0f: visible when hovered. >0.0f: visible when hovered if minimum width. FLT_MAX: never shrink, will behave like ImGuiTabBarFlags_FittingPolicyScroll.
     float       TabCloseButtonMinWidthUnselected;   // -1: always visible. 0.0f: visible when hovered. >0.0f: visible when hovered if minimum width. FLT_MAX: never show close button when unselected.
     float       TabBarBorderSize;           // Thickness of tab-bar separator, which takes on the tab active color to denote focus.
     float       TabBarOverlineSize;         // Thickness of tab-bar overline, which highlights the selected tab-bar.
@@ -2414,21 +2332,19 @@ struct ImGuiStyle
     ImGuiTreeNodeFlags TreeLinesFlags;      // Default way to draw lines connecting TreeNode hierarchy. ImGuiTreeNodeFlags_DrawLinesNone or ImGuiTreeNodeFlags_DrawLinesFull or ImGuiTreeNodeFlags_DrawLinesToNodes.
     float       TreeLinesSize;              // Thickness of outlines when using ImGuiTreeNodeFlags_DrawLines.
     float       TreeLinesRounding;          // Radius of lines connecting child nodes to the vertical line.
-    float       DragDropTargetRounding;     // Radius of the drag and drop target frame.
+    float       DragDropTargetRounding;     // Radius of the drag and drop target frame. When <0.0f: use FrameRounding.
     float       DragDropTargetBorderSize;   // Thickness of the drag and drop target border.
     float       DragDropTargetPadding;      // Size to expand the drag and drop target from actual target item size.
     float       ColorMarkerSize;            // Size of R/G/B/A color markers for ColorEdit4() and for Drags/Sliders when using ImGuiSliderFlags_ColorMarkers.
     ImGuiDir    ColorButtonPosition;        // Side of the color button in the ColorEdit4 widget (left/right). Defaults to ImGuiDir_Right.
     ImVec2      ButtonTextAlign;            // Alignment of button text when button is larger than text. Defaults to (0.5f, 0.5f) (centered).
     ImVec2      SelectableTextAlign;        // Alignment of selectable text. Defaults to (0.0f, 0.0f) (top-left aligned). It's generally important to keep this left-aligned if you want to lay multiple items on a same line.
-    float       SeparatorSize;              // Thickness of border in Separator()
+    float       SeparatorSize;              // Thickness of border in Separator(). Must be >= 1.0f.
     float       SeparatorTextBorderSize;    // Thickness of border in SeparatorText()
     ImVec2      SeparatorTextAlign;         // Alignment of text within the separator. Defaults to (0.0f, 0.5f) (left aligned, center).
     ImVec2      SeparatorTextPadding;       // Horizontal offset of text from each edge of the separator + spacing on other axis. Generally small values. .y is recommended to be == FramePadding.y.
     ImVec2      DisplayWindowPadding;       // Apply to regular windows: amount which we enforce to keep visible when moving near edges of your screen.
     ImVec2      DisplaySafeAreaPadding;     // Apply to every windows, menus, popups, tooltips: amount where we avoid displaying contents. Adjust if you cannot see the edges of your screen (e.g. on a TV where scaling has not been configured).
-    bool        DockingNodeHasCloseButton;  // Docking node has their own CloseButton() to close all docked windows.
-    float       DockingSeparatorSize;       // Thickness of resizing border between docked windows
     float       MouseCursorScale;           // Scale software rendered mouse cursor (when io.MouseDrawCursor is enabled). We apply per-monitor DPI scaling over this scale. May be removed later.
     bool        AntiAliasedLines;           // Enable anti-aliased lines/borders. Disable if you are really tight on CPU/GPU. Latched at the beginning of the frame (copied to ImDrawList).
     bool        AntiAliasedLinesUseTex;     // Enable anti-aliased lines/borders using textures where possible. Require backend to render with bilinear filtering (NOT point/nearest filtering). Latched at the beginning of the frame (copied to ImDrawList).
@@ -2436,6 +2352,10 @@ struct ImGuiStyle
     float       CurveTessellationTol;       // Tessellation tolerance when using PathBezierCurveTo() without a specific number of segments. Decrease for highly tessellated curves (higher quality, more polygons), increase to reduce quality.
     float       CircleTessellationMaxError; // Maximum error (in pixels) allowed when using AddCircle()/AddCircleFilled() or drawing rounded corner rectangles with no explicit segment count specified. Decrease for higher quality but more geometry.
 
+    float       WindowShadowSize;           // Size (in pixels) of window shadows. Set this to zero to disable shadows.
+    float       WindowShadowOffsetDist;     // Offset distance (in pixels) of window shadows from casting window.
+    float       WindowShadowOffsetAngle;    // Offset angle of window shadows from casting window (0.0f = left, 0.5f*PI = bottom, 1.0f*PI = right, 1.5f*PI = top).
+
     // Colors
     ImVec4      Colors[ImGuiCol_COUNT];
 
@@ -2453,7 +2373,7 @@ struct ImGuiStyle
 
     // Functions
     IMGUI_API   ImGuiStyle();
-    IMGUI_API   void ScaleAllSizes(float scale_factor); // Scale all spacing/padding/thickness values. Do not scale fonts.
+    IMGUI_API   void ScaleAllSizes(float scale_factor); // Scale all spacing/padding/thickness values. Do not scale fonts. See comments in definition. Consider not calling this if your initial scale factor if <1.0.
 
     // Obsolete names
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
@@ -2513,25 +2433,6 @@ struct ImGuiIO
     bool        ConfigNavCursorVisibleAuto;     // = true           // Using directional navigation key makes the cursor visible. Mouse click hides the cursor.
     bool        ConfigNavCursorVisibleAlways;   // = false          // Navigation cursor is always visible.
 
-    // Docking options (when ImGuiConfigFlags_DockingEnable is set)
-    bool        ConfigDockingNoSplit;           // = false          // Simplified docking mode: disable window splitting, so docking is limited to merging multiple windows together into tab-bars.
-    bool        ConfigDockingNoDockingOver;     // = false          // Simplified docking mode: disable window merging into a same tab-bar, so docking is limited to splitting windows.
-    bool        ConfigDockingWithShift;         // = false          // Enable docking with holding Shift key (reduce visual noise, allows dropping in wider space)
-    bool        ConfigDockingAlwaysTabBar;      // = false          // [BETA] [FIXME: This currently creates regression with auto-sizing and general overhead] Make every single floating window display within a docking node.
-    bool        ConfigDockingTransparentPayload;// = false          // [BETA] Make window or viewport transparent when docking and only display docking boxes on the target viewport. Useful if rendering of multiple viewport cannot be synced. Best used with ConfigViewportsNoAutoMerge.
-
-    // Viewport options (when ImGuiConfigFlags_ViewportsEnable is set)
-    bool        ConfigViewportsNoAutoMerge;     // = false;         // Set to make all floating imgui windows always create their own viewport. Otherwise, they are merged into the main host viewports when overlapping it. May also set ImGuiViewportFlags_NoAutoMerge on individual viewport.
-    bool        ConfigViewportsNoTaskBarIcon;   // = false          // Disable default OS task bar icon flag for secondary viewports. When a viewport doesn't want a task bar icon, ImGuiViewportFlags_NoTaskBarIcon will be set on it.
-    bool        ConfigViewportsNoDecoration;    // = true           // Disable default OS window decoration flag for secondary viewports. When a viewport doesn't want window decorations, ImGuiViewportFlags_NoDecoration will be set on it. Enabling decoration can create subsequent issues at OS levels (e.g. minimum window size).
-    bool        ConfigViewportsNoDefaultParent; // = true           // When false: set secondary viewports' ParentViewportId to main viewport ID by default. Expects the platform backend to setup a parent/child relationship between the OS windows based on this value. Some backend may ignore this. Set to true if you want viewports to automatically be parent of main viewport, otherwise all viewports will be top-level OS windows.
-    bool        ConfigViewportsPlatformFocusSetsImGuiFocus;//= true // When a platform window is focused (e.g. using Alt+Tab, clicking Platform Title Bar), apply corresponding focus on imgui windows (may clear focus/active id from imgui windows location in other platform windows). In principle this is better enabled but we provide an opt-out, because some Linux window managers tend to eagerly focus windows (e.g. on mouse hover, or even a simple window pos/size change).
-
-    // DPI/Scaling options
-    // This may keep evolving during 1.92.x releases. Expect some turbulence.
-    bool        ConfigDpiScaleFonts;            // = false          // [EXPERIMENTAL] Automatically overwrite style.FontScaleDpi when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
-    bool        ConfigDpiScaleViewports;        // = false          // [EXPERIMENTAL] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
-
     // Miscellaneous options
     // (you can visualize and interact with all options in 'Demo->Configuration')
     bool        MouseDrawCursor;                // = false          // Request ImGui to draw a mouse cursor for you (if you are on a platform without a mouse cursor). Cannot be easily renamed to 'io.ConfigXXX' because this is frequently used by backend implementations.
@@ -2629,7 +2530,6 @@ struct ImGuiIO
     IMGUI_API void  AddMouseButtonEvent(int button, bool down);             // Queue a mouse button change
     IMGUI_API void  AddMouseWheelEvent(float wheel_x, float wheel_y);       // Queue a mouse wheel update. wheel_y<0: scroll down, wheel_y>0: scroll up, wheel_x<0: scroll right, wheel_x>0: scroll left.
     IMGUI_API void  AddMouseSourceEvent(ImGuiMouseSource source);           // Queue a mouse source change (Mouse/TouchScreen/Pen)
-    IMGUI_API void  AddMouseViewportEvent(ImGuiID id);                      // Queue a mouse hovered viewport. Requires backend to set ImGuiBackendFlags_HasMouseHoveredViewport to call this (for multi-viewport support).
     IMGUI_API void  AddFocusEvent(bool focused);                            // Queue a gain/loss of focus for the application (generally based on OS/platform focus of your window)
     IMGUI_API void  AddInputCharacter(unsigned int c);                      // Queue a new character input
     IMGUI_API void  AddInputCharacterUTF16(ImWchar16 c);                    // Queue a new character input from a UTF-16 character, it can be a surrogate
@@ -2675,7 +2575,6 @@ struct ImGuiIO
     float       MouseWheel;                         // Mouse wheel Vertical: 1 unit scrolls about 5 lines text. >0 scrolls Up, <0 scrolls Down. Hold Shift to turn vertical scroll into horizontal scroll.
     float       MouseWheelH;                        // Mouse wheel Horizontal. >0 scrolls Left, <0 scrolls Right. Most users don't have a mouse with a horizontal wheel, may not be filled by all backends.
     ImGuiMouseSource MouseSource;                   // Mouse actual input peripheral (Mouse/TouchScreen/Pen).
-    ImGuiID     MouseHoveredViewport;               // (Optional) Modify using io.AddMouseViewportEvent(). With multi-viewports: viewport the OS mouse is hovering. If possible _IGNORING_ viewports with the ImGuiViewportFlags_NoInputs flag is much better (few backends can handle that). Set io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport if you can provide this info. If you don't imgui will infer the value using the rectangles and last focused time of the viewports it knows about (ignoring other OS windows).
     bool        KeyCtrl;                            // Keyboard modifier down: Ctrl (non-macOS), Cmd (macOS)
     bool        KeyShift;                           // Keyboard modifier down: Shift
     bool        KeyAlt;                             // Keyboard modifier down: Alt
@@ -2700,7 +2599,6 @@ struct ImGuiIO
     bool        MouseCtrlLeftAsRightClick;          // (OSX) Set to true when the current click was a Ctrl+Click that spawned a simulated right click
     float       MouseDownDuration[5];               // Duration the mouse button has been down (0.0f == just clicked)
     float       MouseDownDurationPrev[5];           // Previous time the mouse button has been down
-    ImVec2      MouseDragMaxDistanceAbs[5];         // Maximum distance, absolute, on each axis, of how much mouse has traveled from the clicking point
     float       MouseDragMaxDistanceSqr[5];         // Squared maximum distance of how much mouse has traveled from the clicking point (used for moving thresholds)
     float       PenPressure;                        // Touch/Pen pressure (0.0f to 1.0f, should be >0.0f only when MouseDown[0] == true). Helper storage currently unused by Dear ImGui.
     bool        AppFocusLost;                       // Only modify via AddFocusEvent()
@@ -2752,7 +2650,7 @@ struct ImGuiInputTextCallbackData
     ImGuiInputTextFlags EventFlag;      // One ImGuiInputTextFlags_Callback*    // Read-only
     ImGuiInputTextFlags Flags;          // What user passed to InputText()      // Read-only
     void*               UserData;       // What user passed to InputText()      // Read-only
-    ImGuiID             ID;             // Widget ID                             // Read-only
+    ImGuiID             ID;             // Widget ID                            // Read-only
 
     // Arguments for the different callback events
     // - During Resize callback, Buf will be same as your input buffer.
@@ -2766,9 +2664,9 @@ struct ImGuiInputTextCallbackData
     char*               Buf;            // Text buffer                          // Read-write   // [Resize] Can replace pointer / [Completion,History,Always] Only write to pointed data, don't replace the actual pointer!
     int                 BufTextLen;     // Text length (in bytes)               // Read-write   // [Resize,Completion,History,Always] Exclude zero-terminator storage. In C land: == strlen(some_text), in C++ land: string.length()
     int                 BufSize;        // Buffer size (in bytes) = capacity+1  // Read-only    // [Resize,Completion,History,Always] Include zero-terminator storage. In C land: == ARRAYSIZE(my_char_array), in C++ land: string.capacity()+1
-    int                 CursorPos;      //                                      // Read-write   // [Completion,History,Always]
-    int                 SelectionStart; //                                      // Read-write   // [Completion,History,Always] == to SelectionEnd when no selection
-    int                 SelectionEnd;   //                                      // Read-write   // [Completion,History,Always]
+    int                 CursorPos;      //                                      // Read-write   // [Completion,History,Always,CharFilter]
+    int                 SelectionStart; //                                      // Read-write   // [Completion,History,Always,CharFilter] == to SelectionEnd when no selection
+    int                 SelectionEnd;   //                                      // Read-write   // [Completion,History,Always,CharFilter]
 
     // Helper functions for text manipulation.
     // Use those function to benefit from the CallbackResize behaviors. Calling those function reset the selection.
@@ -2791,28 +2689,6 @@ struct ImGuiSizeCallbackData
     ImVec2  DesiredSize;    // Read-write.  Desired size, based on user's mouse position. Write to this field to restrain resizing.
 };
 
-// [ALPHA] Rarely used / very advanced uses only. Use with SetNextWindowClass() and DockSpace() functions.
-// Important: the content of this class is still highly WIP and likely to change and be refactored
-// before we stabilize Docking features. Please be mindful if using this.
-// Provide hints:
-// - To the platform backend via altered viewport flags (enable/disable OS decoration, OS task bar icons, etc.)
-// - To the platform backend for OS level parent/child relationships of viewport.
-// - To the docking system for various options and filtering.
-struct ImGuiWindowClass
-{
-    ImGuiID             ClassId;                    // User data. 0 = Default class (unclassed). Windows of different classes cannot be docked with each others.
-    ImGuiID             ParentViewportId;           // Hint for the platform backend. -1: use default. 0: request platform backend to not parent the platform. != 0: request platform backend to create a parent<>child relationship between the platform windows. Not conforming backends are free to e.g. parent every viewport to the main viewport or not.
-    ImGuiID             FocusRouteParentWindowId;   // ID of parent window for shortcut focus route evaluation, e.g. Shortcut() call from Parent Window will succeed when this window is focused.
-    ImGuiViewportFlags  ViewportFlagsOverrideSet;   // Viewport flags to set when a window of this class owns a viewport. This allows you to enforce OS decoration or task bar icon, override the defaults on a per-window basis.
-    ImGuiViewportFlags  ViewportFlagsOverrideClear; // Viewport flags to clear when a window of this class owns a viewport. This allows you to enforce OS decoration or task bar icon, override the defaults on a per-window basis.
-    ImGuiTabItemFlags   TabItemFlagsOverrideSet;    // [EXPERIMENTAL] TabItem flags to set when a window of this class gets submitted into a dock node tab bar. May use with ImGuiTabItemFlags_Leading or ImGuiTabItemFlags_Trailing.
-    ImGuiDockNodeFlags  DockNodeFlagsOverrideSet;   // [EXPERIMENTAL] Dock node flags to set when a window of this class is hosted by a dock node (it doesn't have to be selected!)
-    bool                DockingAlwaysTabBar;        // Set to true to enforce single floating windows of this class always having their own docking node (equivalent of setting the global io.ConfigDockingAlwaysTabBar)
-    bool                DockingAllowUnclassed;      // Set to true to allow windows of this class to be docked/merged with an unclassed window. // FIXME-DOCK: Move to DockNodeFlags override?
-
-    ImGuiWindowClass() { memset((void*)this, 0, sizeof(*this)); ParentViewportId = (ImGuiID)-1; DockingAllowUnclassed = true; }
-};
-
 // Data payload for Drag and Drop operations: AcceptDragDropPayload(), GetDragDropPayload()
 struct ImGuiPayload
 {
@@ -3298,12 +3174,6 @@ typedef unsigned short ImDrawIdx;   // Default: 16-bit (for maximum compatibilit
 typedef void (*ImDrawCallback)(const ImDrawList* parent_list, const ImDrawCmd* cmd);
 #endif
 
-// Special Draw callback value to request renderer backend to reset the graphics/render state.
-// The renderer backend needs to handle this special value, otherwise it will crash trying to call a function at this address.
-// This is useful, for example, if you submitted callbacks which you know have altered the render state and you want it to be restored.
-// Render state is not reset by default because they are many perfectly useful way of altering render state (e.g. changing shader/blending settings before an Image call).
-#define ImDrawCallback_ResetRenderState     (ImDrawCallback)(-8)
-
 // Typically, 1 command = 1 GPU draw call (unless command is a callback)
 // - VtxOffset: When 'io.BackendFlags & ImGuiBackendFlags_RendererHasVtxOffset' is enabled,
 //   this fields allow us to render meshes larger than 64K vertices while keeping 16-bit indices.
@@ -3377,16 +3247,15 @@ struct ImDrawListSplitter
 };
 
 // Flags for ImDrawList functions
-// (Legacy: bit 0 must always correspond to ImDrawFlags_Closed to be backward compatible with old API using a bool. Bits 1..3 must be unused)
 enum ImDrawFlags_
 {
     ImDrawFlags_None                        = 0,
-    ImDrawFlags_Closed                      = 1 << 0, // PathStroke(), AddPolyline(): specify that shape should be closed (Important: this is always == 1 for legacy reason)
     ImDrawFlags_RoundCornersTopLeft         = 1 << 4, // AddRect(), AddRectFilled(), PathRect(): enable rounding top-left corner only (when rounding > 0.0f, we default to all corners). Was 0x01.
     ImDrawFlags_RoundCornersTopRight        = 1 << 5, // AddRect(), AddRectFilled(), PathRect(): enable rounding top-right corner only (when rounding > 0.0f, we default to all corners). Was 0x02.
     ImDrawFlags_RoundCornersBottomLeft      = 1 << 6, // AddRect(), AddRectFilled(), PathRect(): enable rounding bottom-left corner only (when rounding > 0.0f, we default to all corners). Was 0x04.
     ImDrawFlags_RoundCornersBottomRight     = 1 << 7, // AddRect(), AddRectFilled(), PathRect(): enable rounding bottom-right corner only (when rounding > 0.0f, we default to all corners). Wax 0x08.
     ImDrawFlags_RoundCornersNone            = 1 << 8, // AddRect(), AddRectFilled(), PathRect(): disable rounding on all corners (when rounding > 0.0f). This is NOT zero, NOT an implicit flag!
+    ImDrawFlags_Closed                      = 1 << 9, // PathStroke(), AddPolyline(): specify that shape should be closed (Important: this is always == 1 for legacy reason)
     ImDrawFlags_RoundCornersTop             = ImDrawFlags_RoundCornersTopLeft | ImDrawFlags_RoundCornersTopRight,
     ImDrawFlags_RoundCornersBottom          = ImDrawFlags_RoundCornersBottomLeft | ImDrawFlags_RoundCornersBottomRight,
     ImDrawFlags_RoundCornersLeft            = ImDrawFlags_RoundCornersBottomLeft | ImDrawFlags_RoundCornersTopLeft,
@@ -3394,6 +3263,9 @@ enum ImDrawFlags_
     ImDrawFlags_RoundCornersAll             = ImDrawFlags_RoundCornersTopLeft | ImDrawFlags_RoundCornersTopRight | ImDrawFlags_RoundCornersBottomLeft | ImDrawFlags_RoundCornersBottomRight,
     ImDrawFlags_RoundCornersDefault_        = ImDrawFlags_RoundCornersAll, // Default to ALL corners if none of the _RoundCornersXX flags are specified.
     ImDrawFlags_RoundCornersMask_           = ImDrawFlags_RoundCornersAll | ImDrawFlags_RoundCornersNone,
+    ImDrawFlags_InvalidMask_                = (ImDrawFlags)0x8000000F,
+
+    ImDrawFlags_ShadowCutOutShapeBackground = 1 << 20, // Do not render the shadow shape under the objects to be shadowed to save on fill-rate or facilitate blending. Slower on CPU.
 };
 
 // Flags for ImDrawList instance. Those are set automatically by ImGui:: functions from ImGuiIO settings, and generally not manipulated directly.
@@ -3459,7 +3331,9 @@ struct ImDrawList
     //   In future versions we will use textures to provide cheaper and higher-quality circles.
     //   Use AddNgon() and AddNgonFilled() functions if you need to guarantee a specific number of sides.
     IMGUI_API void  AddLine(const ImVec2& p1, const ImVec2& p2, ImU32 col, float thickness = 1.0f);
-    IMGUI_API void  AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, ImDrawFlags flags = 0, float thickness = 1.0f);   // a: upper-left, b: lower-right (== upper-left + size)
+    IMGUI_API void  AddLineH(float min_x, float max_x, float y, ImU32 col, float thickness = 1.0f);
+    IMGUI_API void  AddLineV(float x, float min_y, float max_y, ImU32 col, float thickness = 1.0f);
+    IMGUI_API void  AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, float thickness = 1.0f, ImDrawFlags flags = 0);   // a: upper-left, b: lower-right (== upper-left + size)
     IMGUI_API void  AddRectFilled(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, ImDrawFlags flags = 0);                     // a: upper-left, b: lower-right (== upper-left + size)
     IMGUI_API void  AddRectFilledMultiColor(const ImVec2& p_min, const ImVec2& p_max, ImU32 col_upr_left, ImU32 col_upr_right, ImU32 col_bot_right, ImU32 col_bot_left);
     IMGUI_API void  AddQuad(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, ImU32 col, float thickness = 1.0f);
@@ -3480,7 +3354,7 @@ struct ImDrawList
     // General polygon
     // - Only simple polygons are supported by filling functions (no self-intersections, no holes).
     // - Concave polygon fill is more expensive than convex one: it has O(N^2) complexity. Provided as a convenience for the user but not used by the main library.
-    IMGUI_API void  AddPolyline(const ImVec2* points, int num_points, ImU32 col, ImDrawFlags flags, float thickness);
+    IMGUI_API void  AddPolyline(const ImVec2* points, int num_points, ImU32 col, float thickness, ImDrawFlags flags = 0);
     IMGUI_API void  AddConvexPolyFilled(const ImVec2* points, int num_points, ImU32 col);
     IMGUI_API void  AddConcavePolyFilled(const ImVec2* points, int num_points, ImU32 col);
 
@@ -3492,6 +3366,23 @@ struct ImDrawList
     IMGUI_API void  AddImageQuad(ImTextureRef tex_ref, const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, const ImVec2& uv1 = ImVec2(0, 0), const ImVec2& uv2 = ImVec2(1, 0), const ImVec2& uv3 = ImVec2(1, 1), const ImVec2& uv4 = ImVec2(0, 1), ImU32 col = IM_COL32_WHITE);
     IMGUI_API void  AddImageRounded(ImTextureRef tex_ref, const ImVec2& p_min, const ImVec2& p_max, const ImVec2& uv_min, const ImVec2& uv_max, ImU32 col, float rounding, ImDrawFlags flags = 0);
 
+    // Shadows primitives
+    // [BETA] API
+    // - Add shadow for a object, with min/max or center/radius describing the object extents, and offset shifting the shadow.
+    // - Rounding parameters refer to the object itself, not the shadow!
+    // - By default, the area under the object is filled, because this is simpler to process.
+    //   Using the ImDrawFlags_ShadowCutOutShapeBackground flag makes the function not render this area and leave a hole under the object.
+    //    - Shadows w/ fill under the object: a bit faster for CPU, more pixels rendered, visible/darkening if used behind a transparent shape.
+    //      Typically used by: small, frequent objects, opaque objects, transparent objects if shadow darkening isn't an issue.
+    //    - Shadows w/ hole under the object: a bit slower for CPU, less pixels rendered, no difference if used behind a transparent shape.
+    //      Typically used by: large, infrequent objects, transparent objects if exact blending/color matter.
+    // - FIXME-SHADOWS: 'offset' + ImDrawFlags_ShadowCutOutShapeBackground are not currently supported together with AddShadowCircle(), AddShadowConvexPoly(), AddShadowNGon().
+    #define IMGUI_HAS_SHADOWS 1
+    IMGUI_API void  AddShadowRect(const ImVec2& obj_min, const ImVec2& obj_max, ImU32 shadow_col, float shadow_thickness, const ImVec2& shadow_offset, ImDrawFlags flags = 0, float obj_rounding = 0.0f);
+    IMGUI_API void  AddShadowCircle(const ImVec2& obj_center, float obj_radius, ImU32 shadow_col, float shadow_thickness, const ImVec2& shadow_offset, ImDrawFlags flags = 0, int obj_num_segments = 12);
+    IMGUI_API void  AddShadowConvexPoly(const ImVec2* points, int points_count, ImU32 shadow_col, float shadow_thickness, const ImVec2& shadow_offset, ImDrawFlags flags = 0);
+    IMGUI_API void  AddShadowNGon(const ImVec2& obj_center, float obj_radius, ImU32 shadow_col, float shadow_thickness, const ImVec2& shadow_offset, ImDrawFlags flags, int obj_num_segments);
+
     // Stateful path API, add points then finish with PathFillConvex() or PathStroke()
     // - Important: filled shapes must always use clockwise winding order! The anti-aliasing fringe depends on it. Counter-clockwise shapes will have "inward" anti-aliasing.
     //   so e.g. 'PathArcTo(center, radius, PI * -0.5f, PI)' is ok, whereas 'PathArcTo(center, radius, PI, PI * -0.5f)' won't have correct anti-aliasing when followed by PathFillConvex().
@@ -3500,7 +3391,7 @@ struct ImDrawList
     inline    void  PathLineToMergeDuplicate(const ImVec2& pos)                 { if (_Path.Size == 0 || memcmp(&_Path.Data[_Path.Size - 1], &pos, 8) != 0) _Path.push_back(pos); }
     inline    void  PathFillConvex(ImU32 col)                                   { AddConvexPolyFilled(_Path.Data, _Path.Size, col); _Path.Size = 0; }
     inline    void  PathFillConcave(ImU32 col)                                  { AddConcavePolyFilled(_Path.Data, _Path.Size, col); _Path.Size = 0; }
-    inline    void  PathStroke(ImU32 col, ImDrawFlags flags = 0, float thickness = 1.0f) { AddPolyline(_Path.Data, _Path.Size, col, flags, thickness); _Path.Size = 0; }
+    inline    void  PathStroke(ImU32 col, float thickness = 1.0f, ImDrawFlags flags = 0) { AddPolyline(_Path.Data, _Path.Size, col, thickness, flags); _Path.Size = 0; }
     IMGUI_API void  PathArcTo(const ImVec2& center, float radius, float a_min, float a_max, int num_segments = 0);
     IMGUI_API void  PathArcToFast(const ImVec2& center, float radius, int a_min_of_12, int a_max_of_12);                // Use precomputed angles for a 12 steps circle
     IMGUI_API void  PathEllipticalArcTo(const ImVec2& center, const ImVec2& radius, float rot, float a_min, float a_max, int num_segments = 0); // Ellipse
@@ -3510,14 +3401,15 @@ struct ImDrawList
 
     // Advanced: Draw Callbacks
     // - May be used to alter render state (change sampler, blending, current shader). May be used to emit custom rendering commands (difficult to do correctly, but possible).
-    // - Use special ImDrawCallback_ResetRenderState callback to instruct backend to reset its render state to the default.
+    // - Use special GetPlatformIO().DrawCallback_ResetRenderState callback to instruct backend to reset its render state to the default.
+    // - See other standard callbacks in GetPlatformIO(), which may or not be supported by your backend.
     // - Your rendering loop must check for 'UserCallback' in ImDrawCmd and call the function instead of rendering triangles. All standard backends are honoring this.
     // - For some backends, the callback may access selected render-states exposed by the backend in a ImGui_ImplXXXX_RenderState structure pointed to by platform_io.Renderer_RenderState.
     // - IMPORTANT: please be mindful of the different level of indirection between using size==0 (copying argument) and using size>0 (copying pointed data into a buffer).
     //   - If userdata_size == 0: we copy/store the 'userdata' argument as-is. It will be available unmodified in ImDrawCmd::UserCallbackData during render.
     //   - If userdata_size > 0,  we copy/store 'userdata_size' bytes pointed to by 'userdata'. We store them in a buffer stored inside the drawlist. ImDrawCmd::UserCallbackData will point inside that buffer so you have to retrieve data from there. Your callback may need to use ImDrawCmd::UserCallbackDataSize if you expect dynamically-sized data.
     //   - Support for userdata_size > 0 was added in v1.91.4, October 2024. So earlier code always only allowed to copy/store a simple void*.
-    IMGUI_API void  AddCallback(ImDrawCallback callback, void* userdata, size_t userdata_size = 0);
+    IMGUI_API void  AddCallback(ImDrawCallback callback, void* userdata = NULL, size_t userdata_size = 0);
 
     // Advanced: Miscellaneous
     IMGUI_API void  AddDrawCmd();                                               // This is useful if you need to forcefully create a new draw call (to allow for dependent rendering / blending). Otherwise primitives are merged into the same draw-call as much as possible
@@ -3547,8 +3439,15 @@ struct ImDrawList
 
     // Obsolete names
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    inline    void  AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding, ImDrawFlags flags, float thickness) { AddRect(p_min, p_max, col, rounding, thickness, flags); } // OBSOLETED in 1.92.8: NEW FUNCTION SIGNATURE HAS 'thickness' AND 'flags' SWAPPED.
+    inline    void  AddPolyline(const ImVec2* points, int num_points, ImU32 col, ImDrawFlags flags, float thickness)                 { AddPolyline(points, num_points, col, thickness, flags); } // OBSOLETED in 1.92.8: NEW FUNCTION SIGNATURE HAS 'thickness' AND 'flags' SWAPPED.
+    inline    void  PathStroke(ImU32 col, ImDrawFlags flags, float thickness)                                                        { PathStroke(col, thickness, flags); }                      // OBSOLETED in 1.92.8: NEW FUNCTION SIGNATURE HAS 'thickness' AND 'flags' SWAPPED.
     inline    void  PushTextureID(ImTextureRef tex_ref) { PushTexture(tex_ref); }   // RENAMED in 1.92.0
     inline    void  PopTextureID()                      { PopTexture(); }           // RENAMED in 1.92.0
+#else
+    IMGUI_API void  AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding /*= 0.0f*/, ImDrawFlags flags /*= 0*/, float thickness /*= 1.0f*/) = delete;
+    IMGUI_API void  AddPolyline(const ImVec2* points, int num_points, ImU32 col, ImDrawFlags flags, float thickness) = delete;
+    inline    void  PathStroke(ImU32 col, ImDrawFlags flags /*= 0*/, float thickness /*= 1.0f*/) = delete;
 #endif
     //inline  void  AddEllipse(const ImVec2& center, float radius_x, float radius_y, ImU32 col, float rot = 0.0f, int num_segments = 0, float thickness = 1.0f) { AddEllipse(center, ImVec2(radius_x, radius_y), col, rot, num_segments, thickness); } // OBSOLETED in 1.90.5 (Mar 2024)
     //inline  void  AddEllipseFilled(const ImVec2& center, float radius_x, float radius_y, ImU32 col, float rot = 0.0f, int num_segments = 0) { AddEllipseFilled(center, ImVec2(radius_x, radius_y), col, rot, num_segments); }                        // OBSOLETED in 1.90.5 (Mar 2024)
@@ -3660,6 +3559,7 @@ struct ImTextureData
     bool                WantDestroyNextFrame;   // rw   -   // [Internal] Queued to set ImTextureStatus_WantDestroy next frame. May still be used in the current frame.
 
     // Functions
+    // - If GetPixels() functions asserts while being called by your render loop, it could be caused by calling ImFontAtlas::Clear() instead of ClearFonts()?
     ImTextureData()     { memset((void*)this, 0, sizeof(*this)); Status = ImTextureStatus_Destroyed; TexID = ImTextureID_Invalid; }
     ~ImTextureData()    { DestroyPixels(); }
     IMGUI_API void      Create(ImTextureFormat format, int w, int h);
@@ -3682,6 +3582,24 @@ struct ImTextureData
 // [SECTION] Font API (ImFontConfig, ImFontGlyph, ImFontAtlasFlags, ImFontAtlas, ImFontGlyphRangesBuilder, ImFont)
 //-----------------------------------------------------------------------------
 
+// [Internal] Shadow texture baking config
+struct ImFontAtlasShadowTexConfig
+{
+    int     TexCornerSize;          // Size of the corner areas.
+    int     TexEdgeSize;            // Size of the edge areas (and by extension the center). Changing this is normally unnecessary.
+    float   TexFalloffPower;        // The power factor for the shadow falloff curve.
+    float   TexDistanceFieldOffset; // How much to offset the distance field by (allows over/under-shadowing, potentially useful for accommodating rounded corners on the "casting" shape).
+    bool    TexBlur;                // Do we want to Gaussian blur the shadow texture?
+
+    inline ImFontAtlasShadowTexConfig() { memset(this, 0, sizeof(*this)); }
+    IMGUI_API void SetupDefaults();
+    int     GetRectTexPadding() const   { return 2; }                                                   // Number of pixels of padding to add to the rectangular texture to avoid sampling artifacts at the edges.
+    int     CalcRectTexSize() const     { return TexCornerSize + TexEdgeSize + GetRectTexPadding(); }   // The size of the texture area required for the actual 2x2 rectangle shadow texture (after the redundant corners have been removed). Padding is required here to avoid sampling artifacts at the edge adjoining the removed corners.    int     CalcConvexTexWidth() const;                                                                // The width of the texture area required for the convex shape shadow texture.
+    int     GetConvexTexPadding() const { return 8; }                                                   // Number of pixels of padding to add to the convex shape texture to avoid sampling artifacts at the edges. This also acts as padding for the expanded corner triangles.
+    int     CalcConvexTexWidth() const;                                                                 // The width of the texture area required for the convex shape shadow texture.
+    int     CalcConvexTexHeight() const;                                                                // The height of the texture area required for the convex shape shadow texture.
+};
+
 // A font input/source (we may rename this to ImFontSource in the future)
 struct ImFontConfig
 {
@@ -3815,13 +3733,13 @@ struct ImFontAtlas
     IMGUI_API ImFont*           AddFontFromMemoryCompressedBase85TTF(const char* compressed_font_data_base85, float size_pixels = 0.0f, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL);              // 'compressed_font_data_base85' still owned by caller. Compress with binary_to_compressed_c.cpp with -base85 parameter.
     IMGUI_API void              RemoveFont(ImFont* font);
 
-    IMGUI_API void              Clear();                    // Clear everything (input fonts, output glyphs/textures).
+    IMGUI_API void              Clear();                    // Clear everything (fonts + textures). Don't call mid-frame!
+    IMGUI_API void              ClearFonts();               // Clear input+output font data/glyphs. You can call this mid-frame if you load new fonts afterwards!
     IMGUI_API void              CompactCache();             // Compact cached glyphs and texture.
     IMGUI_API void              SetFontLoader(const ImFontLoader* font_loader); // Change font loader at runtime.
 
     // As we are transitioning toward a new font system, we expect to obsolete those soon:
     IMGUI_API void              ClearInputData();           // [OBSOLETE] Clear input data (all ImFontConfig structures including sizes, TTF data, glyph ranges, etc.) = all the data used to build the texture and fonts.
-    IMGUI_API void              ClearFonts();               // [OBSOLETE] Clear input+output font data (same as ClearInputData() + glyphs storage, UV coordinates).
     IMGUI_API void              ClearTexData();             // [OBSOLETE] Clear CPU-side copy of the texture data. Saves RAM once the texture has been copied to graphics memory.
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
@@ -3933,6 +3851,11 @@ struct ImFontAtlas
     int                         RefCount;           // Number of contexts using this atlas
     ImGuiContext*               OwnerContext;       // Context which own the atlas will be in charge of updating and destroying it.
 
+    // [Internal] Shadow data
+    ImFontAtlasRectId           ShadowRectIds[2];   // IDs of rect for shadow textures
+    ImVec4                      ShadowRectUvs[10];  // UV coordinates for shadow textures, 9 for the rectangle shadows and the final entry for the convex shape shadows
+    ImFontAtlasShadowTexConfig  ShadowTexConfig;    // Shadow texture baking config
+
     // [Obsolete]
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     // Legacy: You can request your rectangles to be mapped as font glyph (given a font + Unicode point), so you can render e.g. custom colorful icons and use them as regular glyphs. --> Prefer using a custom ImFontLoader.
@@ -3993,6 +3916,7 @@ enum ImFontFlags_
     ImFontFlags_NoLoadError             = 1 << 1,   // Disable throwing an error/assert when calling AddFontXXX() with missing file/data. Calling code is expected to check AddFontXXX() return value.
     ImFontFlags_NoLoadGlyphs            = 1 << 2,   // [Internal] Disable loading new glyphs.
     ImFontFlags_LockBakedSizes          = 1 << 3,   // [Internal] Disable loading new baked sizes, disable garbage collecting current ones. e.g. if you want to lock a font to a single size. Important: if you use this to preload given sizes, consider the possibility of multiple font density used on Retina display.
+    ImFontFlags_ImplicitRefSize         = 1 << 4,   // [Internal] Reference size was not set explicitly.
 };
 
 // Font runtime data and rendering
@@ -4077,24 +4001,11 @@ enum ImGuiViewportFlags_
     ImGuiViewportFlags_None                     = 0,
     ImGuiViewportFlags_IsPlatformWindow         = 1 << 0,   // Represent a Platform Window
     ImGuiViewportFlags_IsPlatformMonitor        = 1 << 1,   // Represent a Platform Monitor (unused yet)
-    ImGuiViewportFlags_OwnedByApp               = 1 << 2,   // Platform Window: Is created/managed by the user application? (rather than our backend)
-    ImGuiViewportFlags_NoDecoration             = 1 << 3,   // Platform Window: Disable platform decorations: title bar, borders, etc. (generally set all windows, but if ImGuiConfigFlags_ViewportsDecoration is set we only set this on popups/tooltips)
-    ImGuiViewportFlags_NoTaskBarIcon            = 1 << 4,   // Platform Window: Disable platform task bar icon (generally set on popups/tooltips, or all windows if ImGuiConfigFlags_ViewportsNoTaskBarIcon is set)
-    ImGuiViewportFlags_NoFocusOnAppearing       = 1 << 5,   // Platform Window: Don't take focus when created.
-    ImGuiViewportFlags_NoFocusOnClick           = 1 << 6,   // Platform Window: Don't take focus when clicked on.
-    ImGuiViewportFlags_NoInputs                 = 1 << 7,   // Platform Window: Make mouse pass through so we can drag this window while peaking behind it.
-    ImGuiViewportFlags_NoRendererClear          = 1 << 8,   // Platform Window: Renderer doesn't need to clear the framebuffer ahead (because we will fill it entirely).
-    ImGuiViewportFlags_NoAutoMerge              = 1 << 9,   // Platform Window: Avoid merging this window into another host window. This can only be set via ImGuiWindowClass viewport flags override (because we need to now ahead if we are going to create a viewport in the first place!).
-    ImGuiViewportFlags_TopMost                  = 1 << 10,  // Platform Window: Display on top (for tooltips only).
-    ImGuiViewportFlags_CanHostOtherWindows      = 1 << 11,  // Viewport can host multiple imgui windows (secondary viewports are associated to a single window). // FIXME: In practice there's still probably code making the assumption that this is always and only on the MainViewport. Will fix once we add support for "no main viewport".
-
-    // Output status flags (from Platform)
-    ImGuiViewportFlags_IsMinimized              = 1 << 12,  // Platform Window: Window is minimized, can skip render. When minimized we tend to avoid using the viewport pos/size for clipping window or testing if they are contained in the viewport.
-    ImGuiViewportFlags_IsFocused                = 1 << 13,  // Platform Window: Window is focused (last call to Platform_GetWindowFocus() returned true)
+    ImGuiViewportFlags_OwnedByApp               = 1 << 2,   // Platform Window: Is created/managed by the application (rather than a dear imgui backend)
 };
 
 // - Currently represents the Platform Window created by the application which is hosting our Dear ImGui windows.
-// - With multi-viewport enabled, we extend this concept to have multiple active viewports.
+// - In 'docking' branch with multi-viewport enabled, we extend this concept to have multiple active viewports.
 // - In the future we will extend this concept further to also represent Platform Monitor and support a "no main platform window" operation mode.
 // - About Main Area vs Work Area:
 //   - Main Area = entire viewport.
@@ -4109,82 +4020,20 @@ struct ImGuiViewport
     ImVec2              FramebufferScale;       // Density of the viewport for Retina display (always 1,1 on Windows, may be 2,2 etc on macOS/iOS). This will affect font rasterizer density.
     ImVec2              WorkPos;                // Work Area: Position of the viewport minus task bars, menus bars, status bars (>= Pos)
     ImVec2              WorkSize;               // Work Area: Size of the viewport minus task bars, menu bars, status bars (<= Size)
-    float               DpiScale;               // 1.0f = 96 DPI = No extra scale.
-    ImGuiID             ParentViewportId;       // (Advanced) 0: no parent. Instruct the platform backend to setup a parent/child relationship between platform windows.
-    ImGuiViewport*      ParentViewport;         // (Advanced) Direct shortcut to ImGui::FindViewportByID(ParentViewportId). NULL: no parent.
-    ImDrawData*         DrawData;               // The ImDrawData corresponding to this viewport. Valid after Render() and until the next call to NewFrame().
 
     // Platform/Backend Dependent Data
-    // Our design separate the Renderer and Platform backends to facilitate combining default backends with each others.
-    // When our create your own backend for a custom engine, it is possible that both Renderer and Platform will be handled
-    // by the same system and you may not need to use all the UserData/Handle fields.
-    // The library never uses those fields, they are merely storage to facilitate backend implementation.
-    void*               RendererUserData;       // void* to hold custom data structure for the renderer (e.g. swap chain, framebuffers etc.). generally set by your Renderer_CreateWindow function.
-    void*               PlatformUserData;       // void* to hold custom data structure for the OS / platform (e.g. windowing info, render context). generally set by your Platform_CreateWindow function.
-    void*               PlatformHandle;         // void* to hold higher-level, platform window handle (e.g. HWND for Win32 backend, Uint32 WindowID for SDL, GLFWWindow* for GLFW), for FindViewportByPlatformHandle().
-    void*               PlatformHandleRaw;      // void* to hold lower-level, platform-native window handle (always HWND on Win32 platform, unused for other platforms).
-    bool                PlatformWindowCreated;  // Platform window has been created (Platform_CreateWindow() has been called). This is false during the first frame where a viewport is being created.
-    bool                PlatformRequestMove;    // Platform window requested move (e.g. window was moved by the OS / host window manager, authoritative position will be OS window position)
-    bool                PlatformRequestResize;  // Platform window requested resize (e.g. window was resized by the OS / host window manager, authoritative size will be OS window size)
-    bool                PlatformRequestClose;   // Platform window requested closure (e.g. window was moved by the OS / host window manager, e.g. pressing ALT-F4)
+    void*               PlatformHandle;         // void* to hold higher-level, platform window handle (e.g. HWND, GLFWWindow*, SDL_Window*)
+    void*               PlatformHandleRaw;      // void* to hold lower-level, platform-native window handle (under Win32 this is expected to be a HWND, unused for other platforms)
 
     ImGuiViewport()     { memset((void*)this, 0, sizeof(*this)); }
-    ~ImGuiViewport()    { IM_ASSERT(PlatformUserData == NULL && RendererUserData == NULL); }
 
     // Helpers
     ImVec2              GetCenter() const       { return ImVec2(Pos.x + Size.x * 0.5f, Pos.y + Size.y * 0.5f); }
     ImVec2              GetWorkCenter() const   { return ImVec2(WorkPos.x + WorkSize.x * 0.5f, WorkPos.y + WorkSize.y * 0.5f); }
-    IMGUI_API const char* GetDebugName() const;
 };
 
 //-----------------------------------------------------------------------------
-// [SECTION] ImGuiPlatformIO + other Platform Dependent Interfaces (ImGuiPlatformMonitor, ImGuiPlatformImeData)
-//-----------------------------------------------------------------------------
-
-// [BETA] (Optional) Multi-Viewport Support!
-// If you are new to Dear ImGui and trying to integrate it into your engine, you can probably ignore this for now.
-//
-// This feature allows you to seamlessly drag Dear ImGui windows outside of your application viewport.
-// This is achieved by creating new Platform/OS windows on the fly, and rendering into them.
-// Dear ImGui manages the viewport structures, and the backend create and maintain one Platform/OS window for each of those viewports.
-//
-// See Recap:   https://github.com/ocornut/imgui/wiki/Multi-Viewports
-// See Glossary https://github.com/ocornut/imgui/wiki/Glossary for details about some of the terminology.
-//
-// About the coordinates system:
-// - When multi-viewports are enabled, all Dear ImGui coordinates become absolute coordinates (same as OS coordinates!)
-// - So e.g. ImGui::SetNextWindowPos(ImVec2(0,0)) will position a window relative to your primary monitor!
-// - If you want to position windows relative to your main application viewport, use ImGui::GetMainViewport()->Pos as a base position.
-//
-// Steps to use multi-viewports in your application, when using a default backend from the examples/ folder:
-// - Application:  Enable feature with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
-// - Backend:      The backend initialization will setup all necessary ImGuiPlatformIO's functions and update monitors info every frame.
-// - Application:  In your main loop, call ImGui::UpdatePlatformWindows(), ImGui::RenderPlatformWindowsDefault() after EndFrame() or Render().
-// - Application:  Fix absolute coordinates used in ImGui::SetWindowPos() or ImGui::SetNextWindowPos() calls.
-//
-// Steps to use multi-viewports in your application, when using a custom backend:
-// - Important:    THIS IS NOT EASY TO DO and comes with many subtleties not described here!
-//                 It's also an experimental feature, so some of the requirements may evolve.
-//                 Consider using default backends if you can. Either way, carefully follow and refer to examples/ backends for details.
-// - Application:  Enable feature with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
-// - Backend:      Hook ImGuiPlatformIO's Platform_* and Renderer_* callbacks (see below).
-//                 Set 'io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports' and 'io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports'.
-//                 Update ImGuiPlatformIO's Monitors list every frame.
-//                 Update MousePos every frame, in absolute coordinates.
-// - Application:  In your main loop, call ImGui::UpdatePlatformWindows(), ImGui::RenderPlatformWindowsDefault() after EndFrame() or Render().
-//                 You may skip calling RenderPlatformWindowsDefault() if its API is not convenient for your needs. Read comments below.
-// - Application:  Fix absolute coordinates used in ImGui::SetWindowPos() or ImGui::SetNextWindowPos() calls.
-//
-// About ImGui::RenderPlatformWindowsDefault():
-// - This function is a mostly a _helper_ for the common-most cases, and to facilitate using default backends.
-// - You can check its simple source code to understand what it does.
-//   It basically iterates secondary viewports and call 4 functions that are setup in ImGuiPlatformIO, if available:
-//     Platform_RenderWindow(), Renderer_RenderWindow(), Platform_SwapBuffers(), Renderer_SwapBuffers()
-//   Those functions pointers exists only for the benefit of RenderPlatformWindowsDefault().
-// - If you have very specific rendering needs (e.g. flipping multiple swap-chain simultaneously, unusual sync/threading issues, etc.),
-//   you may be tempted to ignore RenderPlatformWindowsDefault() and write customized code to perform your renderingg.
-//   You may decide to setup the platform_io's *RenderWindow and *SwapBuffers pointers and call your functions through those pointers,
-//   or you may decide to never setup those pointers and call your code directly. They are a convenience, not an obligatory interface.
+// [SECTION] Platform Dependent Interfaces
 //-----------------------------------------------------------------------------
 
 // Access via ImGui::GetPlatformIO()
@@ -4228,55 +4077,11 @@ struct ImGuiPlatformIO
     // Written by some backends during ImGui_ImplXXXX_RenderDrawData() call to point backend_specific ImGui_ImplXXXX_RenderState* structure.
     void*       Renderer_RenderState;
 
-    //------------------------------------------------------------------
-    // Input - Interface with Platform & Renderer backends for Multi-Viewport support
-    //------------------------------------------------------------------
-
-    // For reference, the second column shows which function are generally calling the Platform Functions:
-    //   N = ImGui::NewFrame()                        ~ beginning of the dear imgui frame: read info from platform/OS windows (latest size/position)
-    //   F = ImGui::Begin(), ImGui::EndFrame()        ~ during the dear imgui frame
-    //   U = ImGui::UpdatePlatformWindows()           ~ after the dear imgui frame: create and update all platform/OS windows
-    //   R = ImGui::RenderPlatformWindowsDefault()    ~ render
-    //   D = ImGui::DestroyPlatformWindows()          ~ shutdown
-    // The general idea is that NewFrame() we will read the current Platform/OS state, and UpdatePlatformWindows() will write to it.
-
-    // The handlers are designed so we can mix and match two imgui_impl_xxxx files, one Platform backend and one Renderer backend.
-    // Custom engine backends will often provide both Platform and Renderer interfaces together and so may not need to use all functions.
-    // Platform functions are typically called _before_ their Renderer counterpart, apart from Destroy which are called the other way.
-
-    // Platform Backend functions (e.g. Win32, GLFW, SDL) ------------------- Called by -----
-    void    (*Platform_CreateWindow)(ImGuiViewport* vp);                    // . . U . .  // Create a new platform window for the given viewport
-    void    (*Platform_DestroyWindow)(ImGuiViewport* vp);                   // N . U . D  //
-    void    (*Platform_ShowWindow)(ImGuiViewport* vp);                      // . . U . .  // Newly created windows are initially hidden so SetWindowPos/Size/Title can be called on them before showing the window
-    void    (*Platform_SetWindowPos)(ImGuiViewport* vp, ImVec2 pos);        // . . U . .  // Set platform window position (given the upper-left corner of client area)
-    ImVec2  (*Platform_GetWindowPos)(ImGuiViewport* vp);                    // N . . . .  //
-    void    (*Platform_SetWindowSize)(ImGuiViewport* vp, ImVec2 size);      // . . U . .  // Set platform window client area size (ignoring OS decorations such as OS title bar etc.)
-    ImVec2  (*Platform_GetWindowSize)(ImGuiViewport* vp);                   // N . . . .  // Get platform window client area size
-    ImVec2  (*Platform_GetWindowFramebufferScale)(ImGuiViewport* vp);       // N . . . .  // Return viewport density. Always 1,1 on Windows, often 2,2 on Retina display on macOS/iOS. MUST BE INTEGER VALUES.
-    void    (*Platform_SetWindowFocus)(ImGuiViewport* vp);                  // N . . . .  // Move window to front and set input focus
-    bool    (*Platform_GetWindowFocus)(ImGuiViewport* vp);                  // . . U . .  //
-    bool    (*Platform_GetWindowMinimized)(ImGuiViewport* vp);              // N . . . .  // Get platform window minimized state. When minimized, we generally won't attempt to get/set size and contents will be culled more easily
-    void    (*Platform_SetWindowTitle)(ImGuiViewport* vp, const char* str); // . . U . .  // Set platform window title (given an UTF-8 string)
-    void    (*Platform_SetWindowAlpha)(ImGuiViewport* vp, float alpha);     // . . U . .  // (Optional) Setup global transparency (not per-pixel transparency)
-    void    (*Platform_UpdateWindow)(ImGuiViewport* vp);                    // . . U . .  // (Optional) Called by UpdatePlatformWindows(). Optional hook to allow the platform backend from doing general book-keeping every frame.
-    void    (*Platform_RenderWindow)(ImGuiViewport* vp, void* render_arg);  // . . . R .  // (Optional) Main rendering (platform side! This is often unused, or just setting a "current" context for OpenGL bindings). 'render_arg' is the value passed to RenderPlatformWindowsDefault().
-    void    (*Platform_SwapBuffers)(ImGuiViewport* vp, void* render_arg);   // . . . R .  // (Optional) Call Present/SwapBuffers (platform side! This is often unused!). 'render_arg' is the value passed to RenderPlatformWindowsDefault().
-    float   (*Platform_GetWindowDpiScale)(ImGuiViewport* vp);               // N . . . .  // (Optional) [BETA] FIXME-DPI: DPI handling: Return DPI scale for this viewport. 1.0f = 96 DPI.
-    void    (*Platform_OnChangedViewport)(ImGuiViewport* vp);               // . F . . .  // (Optional) [BETA] FIXME-DPI: DPI handling: Called during Begin() every time the viewport we are outputting into changes, so backend has a chance to swap fonts to adjust style.
-    ImVec4  (*Platform_GetWindowWorkAreaInsets)(ImGuiViewport* vp);         // N . . . .  // (Optional) [BETA] Get initial work area inset for the viewport (won't be covered by main menu bar, dockspace over viewport etc.). Default to (0,0),(0,0). 'safeAreaInsets' in iOS land, 'DisplayCutout' in Android land.
-    int     (*Platform_CreateVkSurface)(ImGuiViewport* vp, ImU64 vk_inst, const void* vk_allocators, ImU64* out_vk_surface); // (Optional) For a Vulkan Renderer to call into Platform code (since the surface creation needs to tie them both).
-
-    // Renderer Backend functions (e.g. DirectX, OpenGL, Vulkan) ------------ Called by -----
-    void    (*Renderer_CreateWindow)(ImGuiViewport* vp);                    // . . U . .  // Create swap chain, frame buffers etc. (called after Platform_CreateWindow)
-    void    (*Renderer_DestroyWindow)(ImGuiViewport* vp);                   // N . U . D  // Destroy swap chain, frame buffers etc. (called before Platform_DestroyWindow)
-    void    (*Renderer_SetWindowSize)(ImGuiViewport* vp, ImVec2 size);      // . . U . .  // Resize swap chain, frame buffers etc. (called after Platform_SetWindowSize)
-    void    (*Renderer_RenderWindow)(ImGuiViewport* vp, void* render_arg);  // . . . R .  // (Optional) Clear framebuffer, setup render target, then render the viewport->DrawData. 'render_arg' is the value passed to RenderPlatformWindowsDefault().
-    void    (*Renderer_SwapBuffers)(ImGuiViewport* vp, void* render_arg);   // . . . R .  // (Optional) Call Present/SwapBuffers. 'render_arg' is the value passed to RenderPlatformWindowsDefault().
-
-    // (Optional) Monitor list
-    // - Updated by: app/backend. Update every frame to dynamically support changing monitor or DPI configuration.
-    // - Used by: dear imgui to query DPI info, clamp popups/tooltips within same monitor and not have them straddle monitors.
-    ImVector<ImGuiPlatformMonitor>  Monitors;
+    // Standard draw callbacks provided by renderer backend.
+    ImDrawCallback  DrawCallback_ResetRenderState;      // Request to reset the graphics/render state.
+    ImDrawCallback  DrawCallback_SetSamplerLinear;      // Request backend to set texture sampling to Linear.
+    ImDrawCallback  DrawCallback_SetSamplerNearest;     // Request backend to set texture sampling to Nearest/Point.
+    //ImDrawCallback  DrawCallback_SetSamplerCustom;    // Request backend to set texture sampling using Backend Specific data.
 
     //------------------------------------------------------------------
     // Output
@@ -4286,10 +4091,6 @@ struct ImGuiPlatformIO
     // The ImGui_ImplXXXX_RenderDrawData() function of each backend generally access this via ImDrawData::Textures which points to this. The array is available here mostly because backends will want to destroy textures on shutdown.
     ImVector<ImTextureData*>        Textures;           // List of textures used by Dear ImGui (most often 1) + contents of external texture list is automatically appended into this.
 
-    // Viewports list (the list is updated by calling ImGui::EndFrame or ImGui::Render)
-    // (in the future we will attempt to organize this feature to remove the need for a "main viewport")
-    ImVector<ImGuiViewport*>        Viewports;          // Main viewports, followed by all secondary viewports.
-
     //------------------------------------------------------------------
     // Functions
     //------------------------------------------------------------------
@@ -4298,17 +4099,6 @@ struct ImGuiPlatformIO
     IMGUI_API void ClearRendererHandlers();    // Clear all Renderer_XXX fields. Typically called on Renderer Backend shutdown.
 };
 
-// (Optional) This is required when enabling multi-viewport. Represent the bounds of each connected monitor/display and their DPI.
-// We use this information for multiple DPI support + clamping the position of popups and tooltips so they don't straddle multiple monitors.
-struct ImGuiPlatformMonitor
-{
-    ImVec2  MainPos, MainSize;      // Coordinates of the area displayed on this monitor (Min = upper left, Max = bottom right)
-    ImVec2  WorkPos, WorkSize;      // Coordinates without task bars / side bars / menu bars. Used to avoid positioning popups/tooltips inside this region. If you don't have this info, please copy the value for MainPos/MainSize.
-    float   DpiScale;               // 1.0f = 96 DPI
-    void*   PlatformHandle;         // Backend dependant data (e.g. HMONITOR, GLFWmonitor*, SDL Display Index, NSScreen*)
-    ImGuiPlatformMonitor()          { MainPos = MainSize = WorkPos = WorkSize = ImVec2(0, 0); DpiScale = 1.0f; PlatformHandle = NULL; }
-};
-
 // (Optional) Support for IME (Input Method Editor) via the platform_io.Platform_SetImeDataFn() function. Handler is called during EndFrame().
 struct ImGuiPlatformImeData
 {
@@ -4421,6 +4211,8 @@ namespace ImGui
     //static inline void  SetScrollPosHere()                    { SetScrollHere(); }                                                // OBSOLETED in 1.42
 }
 
+#define ImDrawCallback_ResetRenderState     (ImDrawCallback)(-8)    // OBSOLETED in 1.92.8: Use ImGui::GetPlatformIO().DrawCallback_ResetRenderState
+
 //-- OBSOLETED in 1.92.0: ImFontAtlasCustomRect becomes ImTextureRect
 // - ImFontAtlasCustomRect::X,Y          --> ImTextureRect::x,y
 // - ImFontAtlasCustomRect::Width,Height --> ImTextureRect::w,h