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Diffstat (limited to 'lib/imgui-1.90.7/examples/example_glfw_wgpu/main.cpp')
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1 files changed, 345 insertions, 0 deletions
diff --git a/lib/imgui-1.90.7/examples/example_glfw_wgpu/main.cpp b/lib/imgui-1.90.7/examples/example_glfw_wgpu/main.cpp new file mode 100644 index 0000000..4e47b83 --- /dev/null +++ b/lib/imgui-1.90.7/examples/example_glfw_wgpu/main.cpp @@ -0,0 +1,345 @@ +// Dear ImGui: standalone example application for using GLFW + WebGPU +// - Emscripten is supported for publishing on web. See https://emscripten.org. +// - Dawn is used as a WebGPU implementation on desktop. + +// 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_glfw.h" +#include "imgui_impl_wgpu.h" +#include <stdio.h> + +#ifdef __EMSCRIPTEN__ +#include <emscripten.h> +#include <emscripten/html5.h> +#include <emscripten/html5_webgpu.h> +#else +#include <webgpu/webgpu_glfw.h> +#endif + +#include <GLFW/glfw3.h> +#include <webgpu/webgpu.h> +#include <webgpu/webgpu_cpp.h> + +// This example can also compile and run with Emscripten! See 'Makefile.emscripten' for details. +#ifdef __EMSCRIPTEN__ +#include "../libs/emscripten/emscripten_mainloop_stub.h" +#endif + +// Global WebGPU required states +static WGPUInstance wgpu_instance = nullptr; +static WGPUDevice wgpu_device = nullptr; +static WGPUSurface wgpu_surface = nullptr; +static WGPUTextureFormat wgpu_preferred_fmt = WGPUTextureFormat_RGBA8Unorm; +static WGPUSwapChain wgpu_swap_chain = nullptr; +static int wgpu_swap_chain_width = 1280; +static int wgpu_swap_chain_height = 720; + +// Forward declarations +static bool InitWGPU(GLFWwindow* window); +static void CreateSwapChain(int width, int height); + +static void glfw_error_callback(int error, const char* description) +{ + printf("GLFW Error %d: %s\n", error, description); +} + +static void wgpu_error_callback(WGPUErrorType error_type, const char* message, void*) +{ + const char* error_type_lbl = ""; + switch (error_type) + { + case WGPUErrorType_Validation: error_type_lbl = "Validation"; break; + case WGPUErrorType_OutOfMemory: error_type_lbl = "Out of memory"; break; + case WGPUErrorType_Unknown: error_type_lbl = "Unknown"; break; + case WGPUErrorType_DeviceLost: error_type_lbl = "Device lost"; break; + default: error_type_lbl = "Unknown"; + } + printf("%s error: %s\n", error_type_lbl, message); +} + +// Main code +int main(int, char**) +{ + glfwSetErrorCallback(glfw_error_callback); + if (!glfwInit()) + return 1; + + // Make sure GLFW does not initialize any graphics context. + // This needs to be done explicitly later. + glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API); + GLFWwindow* window = glfwCreateWindow(wgpu_swap_chain_width, wgpu_swap_chain_height, "Dear ImGui GLFW+WebGPU example", nullptr, nullptr); + if (window == nullptr) + return 1; + + // Initialize the WebGPU environment + if (!InitWGPU(window)) + { + if (window) + glfwDestroyWindow(window); + glfwTerminate(); + return 1; + } + CreateSwapChain(wgpu_swap_chain_width, wgpu_swap_chain_height); + glfwShowWindow(window); + + // 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_ImplGlfw_InitForOther(window, true); +#ifdef __EMSCRIPTEN__ + ImGui_ImplGlfw_InstallEmscriptenCanvasResizeCallback("#canvas"); +#endif + ImGui_ImplWGPU_InitInfo init_info; + init_info.Device = wgpu_device; + init_info.NumFramesInFlight = 3; + init_info.RenderTargetFormat = wgpu_preferred_fmt; + init_info.DepthStencilFormat = WGPUTextureFormat_Undefined; + ImGui_ImplWGPU_Init(&init_info); + + // 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 \\ ! + // - Emscripten allows preloading a file or folder to be accessible at runtime. See Makefile for details. + //io.Fonts->AddFontDefault(); +#ifndef IMGUI_DISABLE_FILE_FUNCTIONS + //io.Fonts->AddFontFromFileTTF("fonts/segoeui.ttf", 18.0f); + //io.Fonts->AddFontFromFileTTF("fonts/DroidSans.ttf", 16.0f); + //io.Fonts->AddFontFromFileTTF("fonts/Roboto-Medium.ttf", 16.0f); + //io.Fonts->AddFontFromFileTTF("fonts/Cousine-Regular.ttf", 15.0f); + //io.Fonts->AddFontFromFileTTF("fonts/ProggyTiny.ttf", 10.0f); + //ImFont* font = io.Fonts->AddFontFromFileTTF("fonts/ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese()); + //IM_ASSERT(font != nullptr); +#endif + + // 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 +#ifdef __EMSCRIPTEN__ + // For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file. + // You may manually call LoadIniSettingsFromMemory() to load settings from your own storage. + io.IniFilename = nullptr; + EMSCRIPTEN_MAINLOOP_BEGIN +#else + while (!glfwWindowShouldClose(window)) +#endif + { + // 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. + glfwPollEvents(); + + // React to changes in screen size + int width, height; + glfwGetFramebufferSize((GLFWwindow*)window, &width, &height); + if (width != wgpu_swap_chain_width || height != wgpu_swap_chain_height) + { + ImGui_ImplWGPU_InvalidateDeviceObjects(); + CreateSwapChain(width, height); + ImGui_ImplWGPU_CreateDeviceObjects(); + } + + // Start the Dear ImGui frame + ImGui_ImplWGPU_NewFrame(); + ImGui_ImplGlfw_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(); + +#ifndef __EMSCRIPTEN__ + // Tick needs to be called in Dawn to display validation errors + wgpuDeviceTick(wgpu_device); +#endif + + WGPURenderPassColorAttachment color_attachments = {}; + color_attachments.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED; + color_attachments.loadOp = WGPULoadOp_Clear; + color_attachments.storeOp = WGPUStoreOp_Store; + color_attachments.clearValue = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w }; + color_attachments.view = wgpuSwapChainGetCurrentTextureView(wgpu_swap_chain); + + WGPURenderPassDescriptor render_pass_desc = {}; + render_pass_desc.colorAttachmentCount = 1; + render_pass_desc.colorAttachments = &color_attachments; + render_pass_desc.depthStencilAttachment = nullptr; + + WGPUCommandEncoderDescriptor enc_desc = {}; + WGPUCommandEncoder encoder = wgpuDeviceCreateCommandEncoder(wgpu_device, &enc_desc); + + WGPURenderPassEncoder pass = wgpuCommandEncoderBeginRenderPass(encoder, &render_pass_desc); + ImGui_ImplWGPU_RenderDrawData(ImGui::GetDrawData(), pass); + wgpuRenderPassEncoderEnd(pass); + + WGPUCommandBufferDescriptor cmd_buffer_desc = {}; + WGPUCommandBuffer cmd_buffer = wgpuCommandEncoderFinish(encoder, &cmd_buffer_desc); + WGPUQueue queue = wgpuDeviceGetQueue(wgpu_device); + wgpuQueueSubmit(queue, 1, &cmd_buffer); + +#ifndef __EMSCRIPTEN__ + wgpuSwapChainPresent(wgpu_swap_chain); +#endif + + wgpuTextureViewRelease(color_attachments.view); + wgpuRenderPassEncoderRelease(pass); + wgpuCommandEncoderRelease(encoder); + wgpuCommandBufferRelease(cmd_buffer); + } +#ifdef __EMSCRIPTEN__ + EMSCRIPTEN_MAINLOOP_END; +#endif + + // Cleanup + ImGui_ImplWGPU_Shutdown(); + ImGui_ImplGlfw_Shutdown(); + ImGui::DestroyContext(); + + glfwDestroyWindow(window); + glfwTerminate(); + + return 0; +} + +#ifndef __EMSCRIPTEN__ +static WGPUAdapter RequestAdapter(WGPUInstance instance) +{ + auto onAdapterRequestEnded = [](WGPURequestAdapterStatus status, WGPUAdapter adapter, const char* message, void* pUserData) + { + if (status == WGPURequestAdapterStatus_Success) + *(WGPUAdapter*)(pUserData) = adapter; + else + printf("Could not get WebGPU adapter: %s\n", message); +}; + WGPUAdapter adapter; + wgpuInstanceRequestAdapter(instance, nullptr, onAdapterRequestEnded, (void*)&adapter); + return adapter; +} + +static WGPUDevice RequestDevice(WGPUAdapter& adapter) +{ + auto onDeviceRequestEnded = [](WGPURequestDeviceStatus status, WGPUDevice device, const char* message, void* pUserData) + { + if (status == WGPURequestDeviceStatus_Success) + *(WGPUDevice*)(pUserData) = device; + else + printf("Could not get WebGPU device: %s\n", message); + }; + WGPUDevice device; + wgpuAdapterRequestDevice(adapter, nullptr, onDeviceRequestEnded, (void*)&device); + return device; +} +#endif + +static bool InitWGPU(GLFWwindow* window) +{ + wgpu::Instance instance = wgpuCreateInstance(nullptr); + +#ifdef __EMSCRIPTEN__ + wgpu_device = emscripten_webgpu_get_device(); + if (!wgpu_device) + return false; +#else + WGPUAdapter adapter = RequestAdapter(instance.Get()); + if (!adapter) + return false; + wgpu_device = RequestDevice(adapter); +#endif + +#ifdef __EMSCRIPTEN__ + wgpu::SurfaceDescriptorFromCanvasHTMLSelector html_surface_desc = {}; + html_surface_desc.selector = "#canvas"; + wgpu::SurfaceDescriptor surface_desc = {}; + surface_desc.nextInChain = &html_surface_desc; + wgpu::Surface surface = instance.CreateSurface(&surface_desc); + + wgpu::Adapter adapter = {}; + wgpu_preferred_fmt = (WGPUTextureFormat)surface.GetPreferredFormat(adapter); +#else + wgpu::Surface surface = wgpu::glfw::CreateSurfaceForWindow(instance, window); + if (!surface) + return false; + wgpu_preferred_fmt = WGPUTextureFormat_BGRA8Unorm; +#endif + + wgpu_instance = instance.MoveToCHandle(); + wgpu_surface = surface.MoveToCHandle(); + + wgpuDeviceSetUncapturedErrorCallback(wgpu_device, wgpu_error_callback, nullptr); + + return true; +} + +static void CreateSwapChain(int width, int height) +{ + if (wgpu_swap_chain) + wgpuSwapChainRelease(wgpu_swap_chain); + wgpu_swap_chain_width = width; + wgpu_swap_chain_height = height; + WGPUSwapChainDescriptor swap_chain_desc = {}; + swap_chain_desc.usage = WGPUTextureUsage_RenderAttachment; + swap_chain_desc.format = wgpu_preferred_fmt; + swap_chain_desc.width = width; + swap_chain_desc.height = height; + swap_chain_desc.presentMode = WGPUPresentMode_Fifo; + wgpu_swap_chain = wgpuDeviceCreateSwapChain(wgpu_device, wgpu_surface, &swap_chain_desc); +} |