CI, Backends: fixes for example_null building. Add consistent IMGUI_IMPL_API in backend.

.github/workflows/build.yml

@@ -300,7 +300,7 @@ jobs:
           #include "examples/example_null/main.cpp"
 
           EOF
-          g++ -I. -std=c++11 -Wall -Wformat -Wextra -Werror -Wno-zero-as-null-pointer-constant -Wno-double-promotion -Wno-variadic-macros -Wno-empty-body -o example_single_file example_single_file.cpp
+          g++ -I. -Ibackends -std=c++11 -Wall -Wformat -Wextra -Werror -Wno-zero-as-null-pointer-constant -Wno-double-promotion -Wno-variadic-macros -Wno-empty-body -o example_single_file example_single_file.cpp
 
     - name: Build example_null (freetype)
       run: |
@@ -317,7 +317,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (with ImWchar32)
       run: |
@@ -330,7 +330,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (with large ImDrawIdx + pointer ImTextureID)
       run: |
@@ -344,7 +344,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (with IMGUI_DISABLE_OBSOLETE_FUNCTIONS)
       run: |
@@ -357,7 +357,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (with IMGUI_DISABLE_OBSOLETE_KEYIO)
       run: |
@@ -370,7 +370,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (with C++20)
       run: |
@@ -383,7 +383,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++20 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++20 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (with IMGUI_DISABLE_DEMO_WINDOWS and IMGUI_DISABLE_DEBUG_TOOLS)
       run: |
@@ -397,7 +397,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (with IMGUI_DISABLE_FILE_FUNCTIONS)
       run: |
@@ -410,7 +410,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (with IMGUI_USE_BGRA_PACKED_COLOR)
       run: |
@@ -423,7 +423,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (with IM_VEC2_CLASS_EXTRA and IM_VEC4_CLASS_EXTRA)
       run: |
@@ -444,7 +444,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        g++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        g++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (C++26, Clang)
       run: |
@@ -457,7 +457,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        clang++ -I. -std=c++26 -Wall -Wformat -fno-exceptions -fno-threadsafe-statics -lc -lm -o example_single_file example_single_file.cpp
+        clang++ -I. -Ibackends -std=c++26 -Wall -Wformat -fno-exceptions -fno-threadsafe-statics -lc -lm -o example_single_file example_single_file.cpp
 
     - name: Build example_null (without c++ runtime, Clang)
       run: |
@@ -470,7 +470,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        clang++ -I. -std=c++11 -Wall -Wformat -nodefaultlibs -fno-rtti -fno-exceptions -fno-threadsafe-statics -lc -lm -o example_single_file example_single_file.cpp
+        clang++ -I. -Ibackends -std=c++11 -Wall -Wformat -nodefaultlibs -fno-rtti -fno-exceptions -fno-threadsafe-statics -lc -lm -o example_single_file example_single_file.cpp
 
     - name: Build example_glfw_opengl2
       run: make -C examples/example_glfw_opengl2
@@ -487,7 +487,7 @@ jobs:
       run: make -C examples/example_sdl2_opengl3
 
     - name: Build with IMGUI_IMPL_VULKAN_NO_PROTOTYPES
-      run: g++ -c -I. -std=c++11 -DIMGUI_IMPL_VULKAN_NO_PROTOTYPES=1 backends/imgui_impl_vulkan.cpp
+      run: g++ -c -I. -Ibackends -std=c++11 -DIMGUI_IMPL_VULKAN_NO_PROTOTYPES=1 backends/imgui_impl_vulkan.cpp
 
   MacOS:
     runs-on: macos-latest
@@ -511,7 +511,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        clang++ -I. -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
+        clang++ -I. -Ibackends -std=c++11 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (single file build, c++20)
       run: |
@@ -523,7 +523,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        clang++ -I. -std=c++20 -Wall -Wformat -o example_single_file example_single_file.cpp
+        clang++ -I. -Ibackends -std=c++20 -Wall -Wformat -o example_single_file example_single_file.cpp
 
     - name: Build example_null (without c++ runtime)
       run: |
@@ -535,7 +535,7 @@ jobs:
         #include "examples/example_null/main.cpp"
 
         EOF
-        clang++ -I. -std=c++11 -Wall -Wformat -nodefaultlibs -fno-rtti -fno-exceptions -fno-threadsafe-statics -lc -lm -o example_single_file example_single_file.cpp
+        clang++ -I. -Ibackends -std=c++11 -Wall -Wformat -nodefaultlibs -fno-rtti -fno-exceptions -fno-threadsafe-statics -lc -lm -o example_single_file example_single_file.cpp
 
     - name: Build example_glfw_opengl2
       run: make -C examples/example_glfw_opengl2

backends/imgui_impl_null.cpp

@@ -17,46 +17,46 @@
 #ifndef IMGUI_DISABLE
 #include "imgui_impl_null.h"
 
-bool ImGui_ImplNull_Init()
+IMGUI_IMPL_API bool ImGui_ImplNull_Init()
 {
     ImGui_ImplNullPlatform_Init();
     ImGui_ImplNullRender_Init();
     return true;
 }
 
-void ImGui_ImplNull_Shutdown()
+IMGUI_IMPL_API void ImGui_ImplNull_Shutdown()
 {
     ImGui_ImplNullRender_Shutdown();
     ImGui_ImplNullPlatform_Shutdown();
 }
 
-void ImGui_ImplNull_NewFrame()
+IMGUI_IMPL_API void ImGui_ImplNull_NewFrame()
 {
     ImGui_ImplNullPlatform_NewFrame();
     ImGui_ImplNullRender_NewFrame();
 }
 
-bool ImGui_ImplNullPlatform_Init()
+IMGUI_IMPL_API bool ImGui_ImplNullPlatform_Init()
 {
     ImGuiIO& io = ImGui::GetIO();
     io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;
     return true;
 }
 
-void ImGui_ImplNullPlatform_Shutdown()
+IMGUI_IMPL_API void ImGui_ImplNullPlatform_Shutdown()
 {
     ImGuiIO& io = ImGui::GetIO();
     io.BackendFlags &= ~ImGuiBackendFlags_HasMouseCursors;
 }
 
-void ImGui_ImplNullPlatform_NewFrame()
+IMGUI_IMPL_API void ImGui_ImplNullPlatform_NewFrame()
 {
     ImGuiIO& io = ImGui::GetIO();
     io.DisplaySize = ImVec2(1920, 1080);
     io.DeltaTime = 1.0f / 60.0f;
 }
 
-bool ImGui_ImplNullRender_Init()
+IMGUI_IMPL_API bool ImGui_ImplNullRender_Init()
 {
     ImGuiIO& io = ImGui::GetIO();
     io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;
@@ -64,14 +64,14 @@ bool ImGui_ImplNullRender_Init()
     return true;
 }
 
-void ImGui_ImplNullRender_Shutdown()
+IMGUI_IMPL_API void ImGui_ImplNullRender_Shutdown()
 {
     ImGuiIO& io = ImGui::GetIO();
     io.BackendFlags &= ~ImGuiBackendFlags_RendererHasVtxOffset;
     io.BackendFlags &= ~ImGuiBackendFlags_RendererHasTextures;
 }
 
-void ImGui_ImplNullRender_NewFrame()
+IMGUI_IMPL_API void ImGui_ImplNullRender_NewFrame()
 {
 }
 
@@ -86,7 +86,7 @@ void ImGui_ImplNullRender_UpdateTexture(ImTextureData* tex)
     }
 }
 
-void ImGui_ImplNullRender_RenderDrawData(ImDrawData* draw_data)
+IMGUI_IMPL_API void ImGui_ImplNullRender_RenderDrawData(ImDrawData* draw_data)
 {
     if (draw_data->Textures != nullptr)
         for (ImTextureData* tex : *draw_data->Textures)

backends/imgui_impl_win32.cpp

@@ -220,7 +220,7 @@ IMGUI_IMPL_API bool     ImGui_ImplWin32_InitForOpenGL(void* hwnd)
     return ImGui_ImplWin32_InitEx(hwnd, true);
 }
 
-void    ImGui_ImplWin32_Shutdown()
+IMGUI_IMPL_API void    ImGui_ImplWin32_Shutdown()
 {
     ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
     IM_ASSERT(bd != nullptr && "No platform backend to shutdown, or already shutdown?");
@@ -392,7 +392,7 @@ static void ImGui_ImplWin32_UpdateGamepads(ImGuiIO& io)
 #endif
 }
 
-void    ImGui_ImplWin32_NewFrame()
+IMGUI_IMPL_API 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()?");
@@ -861,7 +861,7 @@ typedef HRESULT(WINAPI* PFN_GetDpiForMonitor)(HMONITOR, MONITOR_DPI_TYPE, UINT*,
 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()
+IMGUI_IMPL_API void ImGui_ImplWin32_EnableDpiAwareness()
 {
     if (_IsWindows10OrGreater())
     {
@@ -890,7 +890,7 @@ void ImGui_ImplWin32_EnableDpiAwareness()
 #pragma comment(lib, "gdi32")   // Link with gdi32.lib for GetDeviceCaps(). MinGW will require linking with '-lgdi32'
 #endif
 
-float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
+IMGUI_IMPL_API float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
 {
     UINT xdpi = 96, ydpi = 96;
     if (_IsWindows8Point1OrGreater())
@@ -916,7 +916,7 @@ float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
     return xdpi / 96.0f;
 }
 
-float ImGui_ImplWin32_GetDpiScaleForHwnd(void* hwnd)
+IMGUI_IMPL_API float ImGui_ImplWin32_GetDpiScaleForHwnd(void* hwnd)
 {
     HMONITOR monitor = ::MonitorFromWindow((HWND)hwnd, MONITOR_DEFAULTTONEAREST);
     return ImGui_ImplWin32_GetDpiScaleForMonitor(monitor);
@@ -933,7 +933,7 @@ float ImGui_ImplWin32_GetDpiScaleForHwnd(void* hwnd)
 // [experimental]
 // Borrowed from GLFW's function updateFramebufferTransparency() in src/win32_window.c
 // (the Dwm* functions are Vista era functions but we are borrowing logic from GLFW)
-void ImGui_ImplWin32_EnableAlphaCompositing(void* hwnd)
+IMGUI_IMPL_API void ImGui_ImplWin32_EnableAlphaCompositing(void* hwnd)
 {
     if (!_IsWindowsVistaOrGreater())
         return;