Merge pull request #312 from jammy3855/jammy3855

SDL3 Renderer Example

backend_test/example_sdl_renderer3/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.30)
+project(cimgui_sdlrenderer3 LANGUAGES C CXX)
+
+set(CMAKE_C_STANDARD 11)
+
+include(FetchContent)
+
+FetchContent_Declare(
+        sdl3
+        GIT_REPOSITORY https://github.com/libsdl-org/SDL.git
+        GIT_TAG release-3.4.0
+        #GIT_SHALLOW TRUE
+        GIT_PROGRESS TRUE
+)
+
+set(SDL_TEST_LIBRARY OFF CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(sdl3)
+
+include(../cmake/GenerateCimguiBindings.cmake)
+
+set(inclulist ${sdl3_SOURCE_DIR}/include)
+GenerateCimguiBindings(cimgui_with_backend sdl3 sdlrenderer3 inclulist)
+target_link_libraries(cimgui_with_backend PRIVATE SDL3::SDL3)
+
+add_executable(${PROJECT_NAME} 
+	main.c
+)
+
+target_link_libraries(${PROJECT_NAME} PRIVATE SDL3::SDL3 cimgui_with_backend)
+target_compile_definitions(
+	${PROJECT_NAME}
+	PRIVATE 
+	CIMGUI_DEFINE_ENUMS_AND_STRUCTS=1
+	CIMGUI_USE_SDL3=1
+  CIMGUI_USE_SDLRENDERER3=1
+)

backend_test/example_sdl_renderer3/README.md

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+# SDLRenderer3
+
+This example takes from `example_sdlgpu3`. We need to generate bindings for SDLRenderer3 backend because they are not native to `cimgui`. Then you can add the compiled library for linking in your application.
+
+For the generation phase from cmake you need LuaJIT to be present.
+
+## Building
+
+From the build directory of your choice:
+
+`cmake path_to_example_sdlgpu3`
+
+Then simply run:
+
+`make`
+

backend_test/example_sdl_renderer3/main.c

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+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <SDL3/SDL.h>
+
+#include <cimgui.h>
+#include <cimgui_impl.h>
+
+#define igGetIO igGetIO_Nil
+
+int main() {
+    // Setup SDL library
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMEPAD)) {
+      fprintf(stderr, "Failed to init video! %s", SDL_GetError());
+      return 1;
+    };
+   
+    // Setup window and renderer
+    float main_scale = SDL_GetDisplayContentScale(SDL_GetPrimaryDisplay());
+    SDL_WindowFlags window_flags = SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIDDEN | SDL_WINDOW_HIGH_PIXEL_DENSITY;
+    SDL_Window* window = NULL;
+    SDL_Renderer* renderer = NULL;
+    if (!SDL_CreateWindowAndRenderer("Dear ImGui SDL3 Renderer example", (int)(1280 * main_scale), (int)(720 * main_scale), window_flags, &window, &renderer))
+    {
+        printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError());
+        return -1;
+    }
+    SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
+    SDL_ShowWindow(window);
+
+    // Setup Dear ImGui context
+    igCreateContext(NULL);
+    ImGuiIO* io = igGetIO(); (void)io;
+    io->ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+    io->ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
+
+    // Setup Dear ImGui style
+    igStyleColorsDark(NULL);
+    //igStyleColorsLight(NULL);
+  
+    // Setup scaling
+    ImGuiStyle* style = igGetStyle();
+    ImGuiStyle_ScaleAllSizes(style, main_scale);        
+    style->FontScaleDpi = main_scale;        // Set initial font scale. (using io.ConfigDpiScaleFonts=true makes this unnecessary. We leave both here for documentation purpose)
+    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);
+    ImGui_ImplSDLRenderer3_Init(renderer);
+
+    // Our state
+    bool show_demo_window = true;
+    bool show_another_window = false;
+    ImVec4 clear_color;
+    clear_color.x = 0.45f;
+    clear_color.y = 0.55f;
+    clear_color.z = 0.60f;
+    clear_color.w = 1.00f;
+
+    // Main loop
+    bool done = false;
+    while (!done)
+    {
+        // Poll and handle events (inputs, window resize, etc.)
+        // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
+        // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
+        // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
+        // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
+        // [If using SDL_MAIN_USE_CALLBACKS: call ImGui_ImplSDL3_ProcessEvent() from your SDL_AppEvent() function]
+        SDL_Event event;
+        while (SDL_PollEvent(&event))
+        {
+            ImGui_ImplSDL3_ProcessEvent(&event);
+            if (event.type == SDL_EVENT_QUIT)
+                done = true;
+            if (event.type == SDL_EVENT_WINDOW_CLOSE_REQUESTED && event.window.windowID == SDL_GetWindowID(window))
+                done = true;
+        }
+
+        // [If using SDL_MAIN_USE_CALLBACKS: all code below would likely be your SDL_AppIterate() function]
+        if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
+        {
+            SDL_Delay(10);
+            continue;
+        }
+
+        // Setup Dear ImGui frame
+        SDL_SetRenderDrawColorFloat(renderer, clear_color.x, clear_color.y, clear_color.z, clear_color.w);
+        SDL_RenderClear(renderer);
+        ImGui_ImplSDLRenderer3_NewFrame();
+        ImGui_ImplSDL3_NewFrame();
+        igNewFrame();
+
+        // 1. Show the big demo window (Most of the sample code is in igShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
+        if (show_demo_window)
+            igShowDemoWindow(&show_demo_window);
+
+        // 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
+        {
+            static float f = 0.0f;
+            static int counter = 0;
+
+            igBegin("Hello, world!", NULL, 0);                    // Create a window called "Hello, world!" and append into it.
+
+            igText("This is some useful text.");                  // Display some text (you can use a format strings too)
+            igCheckbox("Demo Window", &show_demo_window);         // Edit bools storing our window open/close state
+            igCheckbox("Another Window", &show_another_window);
+
+            igSliderFloat("float", &f, 0.0f, 1.0f, "%.3f", 0);    // Edit 1 float using a slider from 0.0f to 1.0f
+            igColorEdit4("clear color", (float*)&clear_color, 0); // Edit 3 floats representing a color
+
+            ImVec2 buttonSize;
+            buttonSize.x = 0;
+            buttonSize.y = 0;
+            if (igButton("Button", buttonSize))                   // Buttons return true when clicked (most widgets return true when edited/activated)
+                counter++;
+            igSameLine(0.0f, -1.0f);
+            igText("counter = %d", counter);
+
+            igText("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io->Framerate, io->Framerate);
+            igEnd();
+        }
+
+        // 3. Show another simple window.
+        if (show_another_window)
+        {
+            igBegin("Another Window", &show_another_window, 0);   // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
+            igText("Hello from another window!");
+            ImVec2 buttonSize;
+            buttonSize.x = 0; buttonSize.y = 0;
+            if (igButton("Close Me", buttonSize))
+                show_another_window = false;
+            igEnd();
+        }
+
+        // Rendering
+        igRender();
+        ImDrawData* draw_data = igGetDrawData();
+        const bool is_minimized = (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f);
+        ImGui_ImplSDLRenderer3_RenderDrawData(draw_data, renderer);
+        SDL_RenderPresent(renderer);
+    }
+
+    // Cleanup
+    // [If using SDL_MAIN_USE_CALLBACKS: all code below would likely be your SDL_AppQuit() function]
+    ImGui_ImplSDL3_Shutdown();
+    ImGui_ImplSDLRenderer3_Shutdown();
+    igDestroyContext(NULL);
+
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+
+    return 0;
+}