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Diffstat (limited to 'lib/imgui-1.90.7/examples/example_sdl2_directx11/main.cpp')
| -rw-r--r-- | lib/imgui-1.90.7/examples/example_sdl2_directx11/main.cpp | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/lib/imgui-1.90.7/examples/example_sdl2_directx11/main.cpp b/lib/imgui-1.90.7/examples/example_sdl2_directx11/main.cpp new file mode 100644 index 0000000..3275baf --- /dev/null +++ b/lib/imgui-1.90.7/examples/example_sdl2_directx11/main.cpp @@ -0,0 +1,245 @@ +// Dear ImGui: standalone example application for SDL2 + DirectX 11 +// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.) + +// 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 + +#include "imgui.h" +#include "imgui_impl_sdl2.h" +#include "imgui_impl_dx11.h" +#include <d3d11.h> +#include <stdio.h> +#include <SDL.h> +#include <SDL_syswm.h> + +// Data +static ID3D11Device* g_pd3dDevice = nullptr; +static ID3D11DeviceContext* g_pd3dDeviceContext = nullptr; +static IDXGISwapChain* g_pSwapChain = nullptr; +static ID3D11RenderTargetView* g_mainRenderTargetView = nullptr; + +// 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 the 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; + } + + // From 2.0.18: Enable native IME. +#ifdef SDL_HINT_IME_SHOW_UI + SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1"); +#endif + + // 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); + if (window == nullptr) + { + printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError()); + return -1; + } + + 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::StyleColorsLight(); + + // Setup Platform/Renderer backends + 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 a nullptr. 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. + // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering. + // - 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("c:\\Windows\\Fonts\\segoeui.ttf", 18.0f); + //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f); + //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f); + //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f); + //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese()); + //IM_ASSERT(font != nullptr); + + // 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, 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. + 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(); + 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 create 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 / io.Framerate, io.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(); + const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w }; + g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, nullptr); + g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha); + 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 to use DirectX11 +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(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, 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 = nullptr; } + if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = nullptr; } + if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; } +} + +void CreateRenderTarget() +{ + ID3D11Texture2D* pBackBuffer; + g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer)); + g_pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &g_mainRenderTargetView); + pBackBuffer->Release(); +} + +void CleanupRenderTarget() +{ + if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = nullptr; } +} |