Added SDL_gpu backend but maybe do not merge?

backends/imgui_impl_sdl3.cpp

@@ -95,6 +95,7 @@ struct ImGui_ImplSDL3_Data
     SDL_Window*             Window;
     SDL_WindowID            WindowID;
     SDL_Renderer*           Renderer;
+    SDL_GPUDevice*          Device;
     Uint64                  Time;
     char*                   ClipboardTextData;
     bool                    UseVulkan;
@@ -470,7 +471,7 @@ static void ImGui_ImplSDL3_SetupPlatformHandles(ImGuiViewport* viewport, SDL_Win
 #endif
 }
 
-static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, void* sdl_gl_context)
+static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, SDL_GPUDevice* device, void* sdl_gl_context)
 {
     ImGuiIO& io = ImGui::GetIO();
     IMGUI_CHECKVERSION();
@@ -500,6 +501,7 @@ static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, void
     bd->Window = window;
     bd->WindowID = SDL_GetWindowID(window);
     bd->Renderer = renderer;
+    bd->Device = device;
 
     // 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.
@@ -562,12 +564,12 @@ static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, void
 // Should technically be a SDL_GLContext but due to typedef it is sane to keep it void* in public interface.
 bool ImGui_ImplSDL3_InitForOpenGL(SDL_Window* window, void* sdl_gl_context)
 {
-    return ImGui_ImplSDL3_Init(window, nullptr, sdl_gl_context);
+    return ImGui_ImplSDL3_Init(window, nullptr, nullptr, sdl_gl_context);
 }
 
 bool ImGui_ImplSDL3_InitForVulkan(SDL_Window* window)
 {
-    if (!ImGui_ImplSDL3_Init(window, nullptr, nullptr))
+    if (!ImGui_ImplSDL3_Init(window, nullptr, nullptr, nullptr))
         return false;
     ImGui_ImplSDL3_Data* bd = ImGui_ImplSDL3_GetBackendData();
     bd->UseVulkan = true;
@@ -579,22 +581,27 @@ bool ImGui_ImplSDL3_InitForD3D(SDL_Window* window)
 #if !defined(_WIN32)
     IM_ASSERT(0 && "Unsupported");
 #endif
-    return ImGui_ImplSDL3_Init(window, nullptr, nullptr);
+    return ImGui_ImplSDL3_Init(window, nullptr, nullptr, nullptr);
 }
 
 bool ImGui_ImplSDL3_InitForMetal(SDL_Window* window)
 {
-    return ImGui_ImplSDL3_Init(window, nullptr, nullptr);
+    return ImGui_ImplSDL3_Init(window, nullptr, nullptr, nullptr);
 }
 
 bool ImGui_ImplSDL3_InitForSDLRenderer(SDL_Window* window, SDL_Renderer* renderer)
 {
-    return ImGui_ImplSDL3_Init(window, renderer, nullptr);
+    return ImGui_ImplSDL3_Init(window, renderer, nullptr, nullptr);
+}
+
+bool ImGui_ImplSDL3_InitForSDLGPU3(SDL_Window* window, SDL_GPUDevice* device)
+{
+    return ImGui_ImplSDL3_Init(window, nullptr, device, nullptr);
 }
 
 bool ImGui_ImplSDL3_InitForOther(SDL_Window* window)
 {
-    return ImGui_ImplSDL3_Init(window, nullptr, nullptr);
+    return ImGui_ImplSDL3_Init(window, nullptr, nullptr, nullptr);
 }
 
 static void ImGui_ImplSDL3_CloseGamepads();

backends/imgui_impl_sdl3.h

@@ -29,6 +29,7 @@
 
 struct SDL_Window;
 struct SDL_Renderer;
+struct SDL_GPUDevice;
 struct SDL_Gamepad;
 typedef union SDL_Event SDL_Event;
 
@@ -38,6 +39,7 @@ IMGUI_IMPL_API bool     ImGui_ImplSDL3_InitForVulkan(SDL_Window* window);
 IMGUI_IMPL_API bool     ImGui_ImplSDL3_InitForD3D(SDL_Window* window);
 IMGUI_IMPL_API bool     ImGui_ImplSDL3_InitForMetal(SDL_Window* window);
 IMGUI_IMPL_API bool     ImGui_ImplSDL3_InitForSDLRenderer(SDL_Window* window, SDL_Renderer* renderer);
+IMGUI_IMPL_API bool     ImGui_ImplSDL3_InitForSDLGPU3(SDL_Window* window, SDL_GPUDevice* device);
 IMGUI_IMPL_API bool     ImGui_ImplSDL3_InitForOther(SDL_Window* window);
 IMGUI_IMPL_API void     ImGui_ImplSDL3_Shutdown();
 IMGUI_IMPL_API void     ImGui_ImplSDL3_NewFrame();

backends/imgui_impl_sdlgpu3.h

@@ -0,0 +1,41 @@
+// dear imgui: Renderer Backend for SDL_gpu for SDL3
+// (Requires: SDL 3.0.0+)
+
+// (**IMPORTANT: SDL 3.0.0 is NOT YET RELEASED AND CURRENTLY HAS A FAST CHANGING API. THIS CODE BREAKS OFTEN AS SDL3 CHANGES.**)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'SDL_Texture*' as ImTextureID. Read the FAQ about ImTextureID!
+//  [ ] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+// 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.
+// 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
+// - Getting Started      https://dearimgui.com/getting-started
+// - Documentation        https://dearimgui.com/docs (same as your local docs/ folder).
+// - Introduction, links and more at the top of imgui.cpp
+
+#pragma once
+#include "imgui.h"  // IMGUI_IMPL_API
+#ifndef IMGUI_DISABLE
+
+struct SDL_GPUDevice;
+struct SDL_Window;
+struct SDL_GPUCommandBuffer;
+struct SDL_GPUTexture;
+
+// Follow "Getting Started" link and check examples/ folder to learn about using backends!
+IMGUI_IMPL_API bool ImGui_ImplSDLGPU3_Init(SDL_GPUDevice* device, SDL_Window* window);
+IMGUI_IMPL_API void ImGui_ImplSDLGPU3_Shutdown();
+IMGUI_IMPL_API void ImGui_ImplSDLGPU3_NewFrame();
+IMGUI_IMPL_API void ImGui_ImplSDLGPU3_RenderDrawData(ImDrawData* draw_data, SDL_GPUCommandBuffer* cmd, SDL_GPUTexture* render_target);
+
+// Called by Init/NewFrame/Shutdown
+IMGUI_IMPL_API bool ImGui_ImplSDLGPU3_CreateFontsTexture();
+IMGUI_IMPL_API void ImGui_ImplSDLGPU3_DestroyFontsTexture();
+IMGUI_IMPL_API bool ImGui_ImplSDLGPU3_CreateDeviceObjects();
+IMGUI_IMPL_API void ImGui_ImplSDLGPU3_DestroyDeviceObjects();
+
+#endif  // #ifndef IMGUI_DISABLE

backends/vulkan/glsl_shader.frag

@@ -1,7 +1,7 @@
 #version 450 core
 layout(location = 0) out vec4 fColor;
 
-layout(set=0, binding=0) uniform sampler2D sTexture;
+layout(set=2, binding=0) uniform sampler2D sTexture;
 
 layout(location = 0) in struct {
     vec4 Color;

backends/vulkan/glsl_shader.vert

@@ -3,10 +3,11 @@ layout(location = 0) in vec2 aPos;
 layout(location = 1) in vec2 aUV;
 layout(location = 2) in vec4 aColor;
 
-layout(push_constant) uniform uPushConstant {
+layout (set = 1, binding = 0) uniform UBO
+{
     vec2 uScale;
     vec2 uTranslate;
-} pc;
+} ;
 
 out gl_PerVertex {
     vec4 gl_Position;
@@ -21,5 +22,5 @@ void main()
 {
     Out.Color = aColor;
     Out.UV = aUV;
-    gl_Position = vec4(aPos * pc.uScale + pc.uTranslate, 0, 1);
+    gl_Position = vec4(aPos * uScale + uTranslate, 0, 1);
 }

examples/example_sdl3_sdlgpu3/Makefile

@@ -0,0 +1,73 @@
+#
+# Cross Platform Makefile
+# Compatible with MSYS2/MINGW, Ubuntu 14.04.1 and Mac OS X
+#
+# You will need SDL3 (http://www.libsdl.org) which is still unreleased/unpackaged.
+
+#CXX = g++
+#CXX = clang++
+
+EXE = example_sdl3_sdlgpu3
+IMGUI_DIR = ../..
+SOURCES = main.cpp
+SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui_draw.cpp $(IMGUI_DIR)/imgui_tables.cpp $(IMGUI_DIR)/imgui_widgets.cpp
+SOURCES += $(IMGUI_DIR)/backends/imgui_impl_sdl3.cpp $(IMGUI_DIR)/backends/imgui_impl_sdlgpu3.cpp
+OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
+UNAME_S := $(shell uname -s)
+LINUX_GL_LIBS = -lGL
+
+CXXFLAGS = -std=c++11 -I$(IMGUI_DIR) -I$(IMGUI_DIR)/backends
+CXXFLAGS += -g -Wall -Wformat
+LIBS =
+
+##---------------------------------------------------------------------
+## BUILD FLAGS PER PLATFORM
+##---------------------------------------------------------------------
+
+ifeq ($(UNAME_S), Linux) #LINUX
+	ECHO_MESSAGE = "Linux"
+	LIBS += -ldl `pkg-config sdl3  --libs`
+
+	CXXFLAGS += `pkg-config sdl3 --cflags`
+	CFLAGS = $(CXXFLAGS)
+endif
+
+ifeq ($(UNAME_S), Darwin) #APPLE
+	ECHO_MESSAGE = "Mac OS X"
+	LIBS += -framework OpenGL -framework Cocoa -framework IOKit -framework CoreVideo `sdl3-config --libs`
+	LIBS += -L/usr/local/lib -L/opt/local/lib
+
+	CXXFLAGS += `pkg-config sdl3 --cflags`
+	CXXFLAGS += -I/usr/local/include -I/opt/local/include
+	CFLAGS = $(CXXFLAGS)
+endif
+
+ifeq ($(OS), Windows_NT)
+    ECHO_MESSAGE = "MinGW"
+    LIBS += -lgdi32 -lopengl32 -limm32 `pkg-config --static --libs sdl3`
+
+    CXXFLAGS += `pkg-config --cflags sdl3`
+    CFLAGS = $(CXXFLAGS)
+endif
+
+##---------------------------------------------------------------------
+## BUILD RULES
+##---------------------------------------------------------------------
+
+%.o:%.cpp
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+%.o:$(IMGUI_DIR)/%.cpp
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+%.o:$(IMGUI_DIR)/backends/%.cpp
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+all: $(EXE)
+	@echo Build complete for $(ECHO_MESSAGE)
+
+$(EXE): $(OBJS)
+	$(CXX) -o $@ $^ $(CXXFLAGS) $(LIBS)
+
+clean:
+	rm -f $(EXE) $(OBJS)