// dear imgui: standalone example application for SDL2 + DirectX 11 // If you are new to dear imgui, see examples/README.txt and documentation at the top of imgui.cpp. // (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.) #include "imgui.h" #include "imgui_impl_sdl.h" #include "imgui_impl_dx11.h" #include <d3d11.h> #include <stdio.h> #include <SDL.h> #include <SDL_syswm.h> // Data static ID3D11Device* g_pd3dDevice = NULL; static ID3D11DeviceContext* g_pd3dDeviceContext = NULL; static IDXGISwapChain* g_pSwapChain = NULL; static ID3D11RenderTargetView* g_mainRenderTargetView = NULL; // Forward declarations of helper functions bool CreateDeviceD3D(HWND hWnd); void CleanupDeviceD3D(); void CreateRenderTarget(); void CleanupRenderTarget(); // Main code int main(int, char**) { // 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; } // Setup window SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI); SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+DirectX11 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags); SDL_SysWMinfo wmInfo; SDL_VERSION(&wmInfo.version); SDL_GetWindowWMInfo(window, &wmInfo); HWND hwnd = (HWND)wmInfo.info.win.window; // Initialize Direct3D if (!CreateDeviceD3D(hwnd)) { CleanupDeviceD3D(); return 1; } // 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 Dear ImGui style ImGui::StyleColorsDark(); //ImGui::StyleColorsClassic(); // Setup Platform/Renderer bindings ImGui_ImplSDL2_InitForD3D(window); ImGui_ImplDX11_Init(g_pd3dDevice, g_pd3dDeviceContext); // 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.md' 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); // Our state bool show_demo_window = true; bool show_another_window = false; ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 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. // - 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; if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_RESIZED && event.window.windowID == SDL_GetWindowID(window)) { // Release all outstanding references to the swap chain's buffers before resizing. CleanupRenderTarget(); g_pSwapChain->ResizeBuffers(0, 0, 0, DXGI_FORMAT_UNKNOWN, 0); CreateRenderTarget(); } } // Start the Dear ImGui frame ImGui_ImplDX11_NewFrame(); 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(); g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL); g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, (float*)&clear_color); ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData()); g_pSwapChain->Present(1, 0); // Present with vsync //g_pSwapChain->Present(0, 0); // Present without vsync } // Cleanup ImGui_ImplDX11_Shutdown(); ImGui_ImplSDL2_Shutdown(); ImGui::DestroyContext(); CleanupDeviceD3D(); SDL_DestroyWindow(window); SDL_Quit(); return 0; } // Helper functions bool CreateDeviceD3D(HWND hWnd) { // Setup swap chain DXGI_SWAP_CHAIN_DESC sd; ZeroMemory(&sd, sizeof(sd)); sd.BufferCount = 2; sd.BufferDesc.Width = 0; sd.BufferDesc.Height = 0; sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; sd.BufferDesc.RefreshRate.Numerator = 60; sd.BufferDesc.RefreshRate.Denominator = 1; sd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH; sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT; sd.OutputWindow = hWnd; sd.SampleDesc.Count = 1; sd.SampleDesc.Quality = 0; sd.Windowed = TRUE; sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD; UINT createDeviceFlags = 0; //createDeviceFlags |= D3D11_CREATE_DEVICE_DEBUG; D3D_FEATURE_LEVEL featureLevel; const D3D_FEATURE_LEVEL featureLevelArray[2] = { D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_10_0, }; if (D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_HARDWARE, NULL, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext) != S_OK) return false; CreateRenderTarget(); return true; } void CleanupDeviceD3D() { CleanupRenderTarget(); if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = NULL; } if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = NULL; } if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; } } void CreateRenderTarget() { ID3D11Texture2D* pBackBuffer; g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer)); g_pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &g_mainRenderTargetView); pBackBuffer->Release(); } void CleanupRenderTarget() { if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = NULL; } }