imgui

main.mm (8885B)

---

 // Dear ImGui: standalone example application for SDL2 + Metal
 // (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)
 // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
 // Read online: https://github.com/ocornut/imgui/tree/master/docs
 
 #include "imgui.h"
 #include "imgui_impl_sdl.h"
 #include "imgui_impl_metal.h"
 #include <stdio.h>
 #include <SDL.h>
 
 #import <Metal/Metal.h>
 #import <QuartzCore/QuartzCore.h>
 
 int main(int, char**)
 {
     // Setup Dear ImGui context
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;   // Enable Gamepad Controls
 
     // Setup style
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsClassic();
 
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
     // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Read 'docs/FONTS.txt' for more instructions and details.
     // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
     //io.Fonts->AddFontDefault();
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
     //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
     //IM_ASSERT(font != NULL);
 
     // Setup SDL
     // (Some versions of SDL before <2.0.10 appears to have performance/stalling issues on a minority of Windows systems,
     // depending on whether SDL_INIT_GAMECONTROLLER is enabled or disabled.. updating to latest version of SDL is recommended!)
     if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0)
     {
         printf("Error: %s\n", SDL_GetError());
         return -1;
     }
 
     // Inform SDL that we will be using metal for rendering. Without this hint initialization of metal renderer may fail.
     SDL_SetHint(SDL_HINT_RENDER_DRIVER, "metal");
 
     SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL+Metal example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
     if (window == NULL)
     {
         printf("Error creating window: %s\n", SDL_GetError());
         return -2;
     }
 
     SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
     if (renderer == NULL)
     {
         printf("Error creating renderer: %s\n", SDL_GetError());
         return -3;
     }
 
     // Setup Platform/Renderer backends
     CAMetalLayer* layer = (__bridge CAMetalLayer*)SDL_RenderGetMetalLayer(renderer);
     layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
     ImGui_ImplMetal_Init(layer.device);
     ImGui_ImplSDL2_InitForMetal(window);
 
     id<MTLCommandQueue> commandQueue = [layer.device newCommandQueue];
     MTLRenderPassDescriptor* renderPassDescriptor = [MTLRenderPassDescriptor new];
 
     // Our state
     bool show_demo_window = true;
     bool show_another_window = false;
     float clear_color[4] = {0.45f, 0.55f, 0.60f, 1.00f};
 
     // Main loop
     bool done = false;
     while (!done)
     {
         @autoreleasepool
         {
             // 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.
             // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
             // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
             SDL_Event event;
             while (SDL_PollEvent(&event))
             {
                 ImGui_ImplSDL2_ProcessEvent(&event);
                 if (event.type == SDL_QUIT)
                     done = true;
                 if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
                     done = true;
             }
 
             int width, height;
             SDL_GetRendererOutputSize(renderer, &width, &height);
             layer.drawableSize = CGSizeMake(width, height);
             id<CAMetalDrawable> drawable = [layer nextDrawable];
 
             id<MTLCommandBuffer> commandBuffer = [commandQueue commandBuffer];
             renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(clear_color[0] * clear_color[3], clear_color[1] * clear_color[3], clear_color[2] * clear_color[3], clear_color[3]);
             renderPassDescriptor.colorAttachments[0].texture = drawable.texture;
             renderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
             renderPassDescriptor.colorAttachments[0].storeAction = MTLStoreActionStore;
             id <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
             [renderEncoder pushDebugGroup:@"ImGui demo"];
 
             // Start the Dear ImGui frame
             ImGui_ImplMetal_NewFrame(renderPassDescriptor);
             ImGui_ImplSDL2_NewFrame(window);
             ImGui::NewFrame();
 
             // 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
             if (show_demo_window)
                 ImGui::ShowDemoWindow(&show_demo_window);
 
             // 2. Show a simple window that we create ourselves. We use a Begin/End pair to created a named window.
             {
                 static float f = 0.0f;
                 static int counter = 0;
 
                 ImGui::Begin("Hello, world!");                          // Create a window called "Hello, world!" and append into it.
 
                 ImGui::Text("This is some useful text.");               // Display some text (you can use a format strings too)
                 ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
                 ImGui::Checkbox("Another Window", &show_another_window);
 
                 ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
                 ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
 
                 if (ImGui::Button("Button"))                            // Buttons return true when clicked (most widgets return true when edited/activated)
                     counter++;
                 ImGui::SameLine();
                 ImGui::Text("counter = %d", counter);
 
                 ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
                 ImGui::End();
             }
 
             // 3. Show another simple window.
             if (show_another_window)
             {
                 ImGui::Begin("Another Window", &show_another_window);   // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
                 ImGui::Text("Hello from another window!");
                 if (ImGui::Button("Close Me"))
                     show_another_window = false;
                 ImGui::End();
             }
 
             // Rendering
             ImGui::Render();
             ImGui_ImplMetal_RenderDrawData(ImGui::GetDrawData(), commandBuffer, renderEncoder);
 
             [renderEncoder popDebugGroup];
             [renderEncoder endEncoding];
 
             [commandBuffer presentDrawable:drawable];
             [commandBuffer commit];
         }
     }
 
     // Cleanup
     ImGui_ImplMetal_Shutdown();
     ImGui_ImplSDL2_Shutdown();
     ImGui::DestroyContext();
 
     SDL_DestroyRenderer(renderer);
     SDL_DestroyWindow(window);
     SDL_Quit();
 
     return 0;
 }