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347 lines
14 KiB
C++
347 lines
14 KiB
C++
// Dear ImGui: standalone example application for using GLFW + WebGPU
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// - Emscripten is supported for publishing on web. See https://emscripten.org.
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// - Dawn is used as a WebGPU implementation on desktop.
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// Learn about Dear ImGui:
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// - FAQ https://dearimgui.com/faq
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// - Getting Started https://dearimgui.com/getting-started
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// - Documentation https://dearimgui.com/docs (same as your local docs/ folder).
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// - Introduction, links and more at the top of imgui.cpp
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#include "imgui.h"
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#include "imgui_impl_glfw.h"
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#include "imgui_impl_wgpu.h"
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#include <stdio.h>
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#ifdef __EMSCRIPTEN__
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#include <emscripten.h>
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#include <emscripten/html5.h>
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#include <emscripten/html5_webgpu.h>
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#else
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#include <webgpu/webgpu_glfw.h>
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#endif
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#include <GLFW/glfw3.h>
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#include <webgpu/webgpu.h>
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#include <webgpu/webgpu_cpp.h>
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// This example can also compile and run with Emscripten! See 'Makefile.emscripten' for details.
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#ifdef __EMSCRIPTEN__
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#include "../libs/emscripten/emscripten_mainloop_stub.h"
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#endif
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// Global WebGPU required states
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static WGPUInstance wgpu_instance = nullptr;
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static WGPUDevice wgpu_device = nullptr;
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static WGPUSurface wgpu_surface = nullptr;
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static WGPUTextureFormat wgpu_preferred_fmt = WGPUTextureFormat_RGBA8Unorm;
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static WGPUSwapChain wgpu_swap_chain = nullptr;
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static int wgpu_swap_chain_width = 1280;
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static int wgpu_swap_chain_height = 720;
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// Forward declarations
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static bool InitWGPU(GLFWwindow* window);
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static void CreateSwapChain(int width, int height);
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static void glfw_error_callback(int error, const char* description)
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{
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printf("GLFW Error %d: %s\n", error, description);
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}
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static void wgpu_error_callback(WGPUErrorType error_type, const char* message, void*)
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{
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const char* error_type_lbl = "";
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switch (error_type)
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{
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case WGPUErrorType_Validation: error_type_lbl = "Validation"; break;
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case WGPUErrorType_OutOfMemory: error_type_lbl = "Out of memory"; break;
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case WGPUErrorType_Unknown: error_type_lbl = "Unknown"; break;
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case WGPUErrorType_DeviceLost: error_type_lbl = "Device lost"; break;
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default: error_type_lbl = "Unknown";
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}
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printf("%s error: %s\n", error_type_lbl, message);
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}
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// Main code
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int main(int, char**)
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{
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glfwSetErrorCallback(glfw_error_callback);
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if (!glfwInit())
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return 1;
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// Make sure GLFW does not initialize any graphics context.
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// This needs to be done explicitly later.
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glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
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GLFWwindow* window = glfwCreateWindow(wgpu_swap_chain_width, wgpu_swap_chain_height, "Dear ImGui GLFW+WebGPU example", nullptr, nullptr);
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if (window == nullptr)
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return 1;
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// Initialize the WebGPU environment
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if (!InitWGPU(window))
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{
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if (window)
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glfwDestroyWindow(window);
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glfwTerminate();
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return 1;
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}
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CreateSwapChain(wgpu_swap_chain_width, wgpu_swap_chain_height);
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glfwShowWindow(window);
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// Setup Dear ImGui context
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IMGUI_CHECKVERSION();
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ImGui::CreateContext();
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ImGuiIO& io = ImGui::GetIO(); (void)io;
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io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
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io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
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io.ConfigFlags |= ImGuiConfigFlags_DockingEnable; // Enable Docking
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// Setup Dear ImGui style
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ImGui::StyleColorsDark();
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//ImGui::StyleColorsLight();
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// Setup Platform/Renderer backends
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ImGui_ImplGlfw_InitForOther(window, true);
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#ifdef __EMSCRIPTEN__
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ImGui_ImplGlfw_InstallEmscriptenCanvasResizeCallback("#canvas");
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#endif
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ImGui_ImplWGPU_InitInfo init_info;
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init_info.Device = wgpu_device;
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init_info.NumFramesInFlight = 3;
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init_info.RenderTargetFormat = wgpu_preferred_fmt;
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init_info.DepthStencilFormat = WGPUTextureFormat_Undefined;
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ImGui_ImplWGPU_Init(&init_info);
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// Load Fonts
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// - 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.
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// - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
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// - 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).
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// - 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.
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// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
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// - Read 'docs/FONTS.md' for more instructions and details.
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// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
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// - Emscripten allows preloading a file or folder to be accessible at runtime. See Makefile for details.
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//io.Fonts->AddFontDefault();
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#ifndef IMGUI_DISABLE_FILE_FUNCTIONS
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//io.Fonts->AddFontFromFileTTF("fonts/segoeui.ttf", 18.0f);
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//io.Fonts->AddFontFromFileTTF("fonts/DroidSans.ttf", 16.0f);
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//io.Fonts->AddFontFromFileTTF("fonts/Roboto-Medium.ttf", 16.0f);
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//io.Fonts->AddFontFromFileTTF("fonts/Cousine-Regular.ttf", 15.0f);
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//io.Fonts->AddFontFromFileTTF("fonts/ProggyTiny.ttf", 10.0f);
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//ImFont* font = io.Fonts->AddFontFromFileTTF("fonts/ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
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//IM_ASSERT(font != nullptr);
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#endif
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// Our state
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bool show_demo_window = true;
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bool show_another_window = false;
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ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
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// Main loop
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#ifdef __EMSCRIPTEN__
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// For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
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// You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
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io.IniFilename = nullptr;
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EMSCRIPTEN_MAINLOOP_BEGIN
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#else
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while (!glfwWindowShouldClose(window))
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#endif
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{
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// Poll and handle events (inputs, window resize, etc.)
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// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
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// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
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// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
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// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
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glfwPollEvents();
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// React to changes in screen size
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int width, height;
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glfwGetFramebufferSize((GLFWwindow*)window, &width, &height);
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if (width != wgpu_swap_chain_width || height != wgpu_swap_chain_height)
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{
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ImGui_ImplWGPU_InvalidateDeviceObjects();
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CreateSwapChain(width, height);
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ImGui_ImplWGPU_CreateDeviceObjects();
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}
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// Start the Dear ImGui frame
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ImGui_ImplWGPU_NewFrame();
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ImGui_ImplGlfw_NewFrame();
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ImGui::NewFrame();
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// 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!).
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if (show_demo_window)
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ImGui::ShowDemoWindow(&show_demo_window);
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// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
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{
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static float f = 0.0f;
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static int counter = 0;
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ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
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ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
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ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
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ImGui::Checkbox("Another Window", &show_another_window);
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ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
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ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
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if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
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counter++;
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ImGui::SameLine();
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ImGui::Text("counter = %d", counter);
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ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
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ImGui::End();
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}
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// 3. Show another simple window.
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if (show_another_window)
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{
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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)
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ImGui::Text("Hello from another window!");
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if (ImGui::Button("Close Me"))
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show_another_window = false;
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ImGui::End();
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}
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// Rendering
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ImGui::Render();
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#ifndef __EMSCRIPTEN__
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// Tick needs to be called in Dawn to display validation errors
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wgpuDeviceTick(wgpu_device);
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#endif
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WGPURenderPassColorAttachment color_attachments = {};
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color_attachments.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
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color_attachments.loadOp = WGPULoadOp_Clear;
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color_attachments.storeOp = WGPUStoreOp_Store;
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color_attachments.clearValue = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
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color_attachments.view = wgpuSwapChainGetCurrentTextureView(wgpu_swap_chain);
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WGPURenderPassDescriptor render_pass_desc = {};
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render_pass_desc.colorAttachmentCount = 1;
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render_pass_desc.colorAttachments = &color_attachments;
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render_pass_desc.depthStencilAttachment = nullptr;
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WGPUCommandEncoderDescriptor enc_desc = {};
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WGPUCommandEncoder encoder = wgpuDeviceCreateCommandEncoder(wgpu_device, &enc_desc);
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WGPURenderPassEncoder pass = wgpuCommandEncoderBeginRenderPass(encoder, &render_pass_desc);
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ImGui_ImplWGPU_RenderDrawData(ImGui::GetDrawData(), pass);
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wgpuRenderPassEncoderEnd(pass);
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WGPUCommandBufferDescriptor cmd_buffer_desc = {};
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WGPUCommandBuffer cmd_buffer = wgpuCommandEncoderFinish(encoder, &cmd_buffer_desc);
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WGPUQueue queue = wgpuDeviceGetQueue(wgpu_device);
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wgpuQueueSubmit(queue, 1, &cmd_buffer);
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#ifndef __EMSCRIPTEN__
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wgpuSwapChainPresent(wgpu_swap_chain);
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#endif
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wgpuTextureViewRelease(color_attachments.view);
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wgpuRenderPassEncoderRelease(pass);
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wgpuCommandEncoderRelease(encoder);
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wgpuCommandBufferRelease(cmd_buffer);
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}
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#ifdef __EMSCRIPTEN__
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EMSCRIPTEN_MAINLOOP_END;
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#endif
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// Cleanup
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ImGui_ImplWGPU_Shutdown();
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ImGui_ImplGlfw_Shutdown();
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ImGui::DestroyContext();
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glfwDestroyWindow(window);
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glfwTerminate();
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return 0;
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}
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#ifndef __EMSCRIPTEN__
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static WGPUAdapter RequestAdapter(WGPUInstance instance)
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{
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auto onAdapterRequestEnded = [](WGPURequestAdapterStatus status, WGPUAdapter adapter, const char* message, void* pUserData)
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{
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if (status == WGPURequestAdapterStatus_Success)
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*(WGPUAdapter*)(pUserData) = adapter;
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else
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printf("Could not get WebGPU adapter: %s\n", message);
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};
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WGPUAdapter adapter;
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wgpuInstanceRequestAdapter(instance, nullptr, onAdapterRequestEnded, (void*)&adapter);
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return adapter;
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}
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static WGPUDevice RequestDevice(WGPUAdapter& adapter)
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{
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auto onDeviceRequestEnded = [](WGPURequestDeviceStatus status, WGPUDevice device, const char* message, void* pUserData)
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{
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if (status == WGPURequestDeviceStatus_Success)
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*(WGPUDevice*)(pUserData) = device;
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else
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printf("Could not get WebGPU device: %s\n", message);
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};
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WGPUDevice device;
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wgpuAdapterRequestDevice(adapter, nullptr, onDeviceRequestEnded, (void*)&device);
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return device;
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}
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#endif
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static bool InitWGPU(GLFWwindow* window)
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{
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wgpu::Instance instance = wgpuCreateInstance(nullptr);
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#ifdef __EMSCRIPTEN__
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wgpu_device = emscripten_webgpu_get_device();
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if (!wgpu_device)
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return false;
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#else
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WGPUAdapter adapter = RequestAdapter(instance.Get());
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if (!adapter)
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return false;
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wgpu_device = RequestDevice(adapter);
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#endif
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#ifdef __EMSCRIPTEN__
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wgpu::SurfaceDescriptorFromCanvasHTMLSelector html_surface_desc = {};
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html_surface_desc.selector = "#canvas";
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wgpu::SurfaceDescriptor surface_desc = {};
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surface_desc.nextInChain = &html_surface_desc;
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wgpu::Surface surface = instance.CreateSurface(&surface_desc);
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wgpu::Adapter adapter = {};
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wgpu_preferred_fmt = (WGPUTextureFormat)surface.GetPreferredFormat(adapter);
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#else
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wgpu::Surface surface = wgpu::glfw::CreateSurfaceForWindow(instance, window);
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if (!surface)
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return false;
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wgpu_preferred_fmt = WGPUTextureFormat_BGRA8Unorm;
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#endif
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wgpu_instance = instance.MoveToCHandle();
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wgpu_surface = surface.MoveToCHandle();
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wgpuDeviceSetUncapturedErrorCallback(wgpu_device, wgpu_error_callback, nullptr);
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return true;
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}
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static void CreateSwapChain(int width, int height)
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{
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if (wgpu_swap_chain)
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wgpuSwapChainRelease(wgpu_swap_chain);
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wgpu_swap_chain_width = width;
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wgpu_swap_chain_height = height;
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WGPUSwapChainDescriptor swap_chain_desc = {};
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swap_chain_desc.usage = WGPUTextureUsage_RenderAttachment;
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swap_chain_desc.format = wgpu_preferred_fmt;
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swap_chain_desc.width = width;
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swap_chain_desc.height = height;
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swap_chain_desc.presentMode = WGPUPresentMode_Fifo;
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wgpu_swap_chain = wgpuDeviceCreateSwapChain(wgpu_device, wgpu_surface, &swap_chain_desc);
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}
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