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Viewports: added per-viewport FramebufferScale, Platform_GetWindowFramebufferScale() + Backends: GLFW, SDL2, SDL3, Apple: added support. (#1065, #1542, #1676, #1786, #2826, #3757, #5081, #5580, #5592, #6465, #7273, #7779 etc.)

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Metal backend is not in charge of writing to DpiScale/FramebufferScale (tho it was a neat workaround).
This commit is contained in:
ocornut
2025-05-15 14:31:26 +02:00
parent 63554bcee5
commit c90ea1315a
9 changed files with 119 additions and 46 deletions
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36
backends/imgui_impl_sdl3.cpp
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@@ -24,6 +24,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2025-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
// 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.
@@ -901,22 +902,28 @@ static void ImGui_ImplSDL3_UpdateMonitors()
SDL_free(displays);
}
static void ImGui_ImplSDL3_GetWindowSizeAndFramebufferScale(SDL_Window* window, ImVec2* out_size, ImVec2* out_framebuffer_scale)
{
int w, h;
int display_w, display_h;
SDL_GetWindowSize(window, &w, &h);
if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
w = h = 0;
SDL_GetWindowSizeInPixels(window, &display_w, &display_h);
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);
}
void ImGui_ImplSDL3_NewFrame()
{
ImGui_ImplSDL3_Data* bd = ImGui_ImplSDL3_GetBackendData();
IM_ASSERT(bd != nullptr && "Context or backend not initialized! Did you call ImGui_ImplSDL3_Init()?");
ImGuiIO& io = ImGui::GetIO();
// Setup display size (every frame to accommodate for window resizing)
int w, h;
int display_w, display_h;
SDL_GetWindowSize(bd->Window, &w, &h);
if (SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_MINIMIZED)
w = h = 0;
SDL_GetWindowSizeInPixels(bd->Window, &display_w, &display_h);
io.DisplaySize = ImVec2((float)w, (float)h);
if (w > 0 && h > 0)
io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h);
// Setup main viewport size (every frame to accommodate for window resizing)
ImGui_ImplSDL3_GetWindowSizeAndFramebufferScale(bd->Window, &io.DisplaySize, &io.DisplayFramebufferScale);
// Update monitors
#ifdef WIN32
@@ -1117,6 +1124,14 @@ static void ImGui_ImplSDL3_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
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;
@@ -1187,6 +1202,7 @@ static void ImGui_ImplSDL3_InitMultiViewportSupport(SDL_Window* window, void* sd
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;