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@@ -11,13 +11,20 @@
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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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+#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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+
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// Global WebGPU required states
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static WGPUDevice wgpu_device = nullptr;
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static WGPUSurface wgpu_surface = nullptr;
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@@ -27,15 +34,32 @@ static int wgpu_swap_chain_width = 0;
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static int wgpu_swap_chain_height = 0;
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// Forward declarations
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-static void MainLoopStep(void* window);
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static bool InitWGPU();
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-static void print_glfw_error(int error, const char* description);
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-static void print_wgpu_error(WGPUErrorType error_type, const char* message, void*);
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+static void CreateSwapChain(int width, int height);
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+
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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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+
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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(print_glfw_error);
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+ glfwSetErrorCallback(glfw_error_callback);
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if (!glfwInit())
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return 1;
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@@ -43,11 +67,8 @@ int main(int, char**)
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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(1280, 720, "Dear ImGui GLFW+WebGPU example", nullptr, nullptr);
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- if (!window)
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- {
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- glfwTerminate();
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+ if (window == nullptr)
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return 1;
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- }
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// Initialize the WebGPU environment
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if (!InitWGPU())
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@@ -66,18 +87,21 @@ int main(int, char**)
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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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- // 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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-
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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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- ImGui_ImplWGPU_Init(wgpu_device, 3, wgpu_preferred_fmt, WGPUTextureFormat_Undefined);
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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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@@ -99,10 +123,117 @@ int main(int, char**)
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//IM_ASSERT(font != nullptr);
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#endif
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- // This function will directly return and exit the main function.
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- // Make sure that no required objects get cleaned up.
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- // This way we can use the browsers 'requestAnimationFrame' to control the rendering.
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- emscripten_set_main_loop_arg(MainLoopStep, window, 0, false);
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ // Rendering
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+ ImGui::Render();
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+
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+ WGPURenderPassColorAttachment color_attachments = {};
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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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+
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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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+
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+ WGPUCommandEncoderDescriptor enc_desc = {};
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+ WGPUCommandEncoder encoder = wgpuDeviceCreateCommandEncoder(wgpu_device, &enc_desc);
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+
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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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+
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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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+ }
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+#ifdef __EMSCRIPTEN__
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+ EMSCRIPTEN_MAINLOOP_END;
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+#endif
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+
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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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+
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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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@@ -113,7 +244,7 @@ static bool InitWGPU()
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if (!wgpu_device)
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return false;
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- wgpuDeviceSetUncapturedErrorCallback(wgpu_device, print_wgpu_error, nullptr);
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+ wgpuDeviceSetUncapturedErrorCallback(wgpu_device, wgpu_error_callback, nullptr);
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// Use C++ wrapper due to misbehavior in Emscripten.
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// Some offset computation for wgpuInstanceCreateSurface in JavaScript
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@@ -128,127 +259,22 @@ static bool InitWGPU()
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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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- wgpu_surface = surface.Release();
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+ wgpu_surface = surface.MoveToCHandle();
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return true;
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}
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-static void MainLoopStep(void* window)
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+static void CreateSwapChain(int width, int height)
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{
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- ImGuiIO& io = ImGui::GetIO();
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-
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- glfwPollEvents();
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-
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- int width, height;
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- glfwGetFramebufferSize((GLFWwindow*)window, &width, &height);
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-
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- // React to changes in screen size
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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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- 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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- ImGui_ImplWGPU_CreateDeviceObjects();
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- }
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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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-
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- // Our state
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- // (we use static, which essentially makes the variable globals, as a convenience to keep the example code easy to follow)
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- static bool show_demo_window = true;
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- static bool show_another_window = false;
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- static ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
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-
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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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-
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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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-
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- ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
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-
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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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-
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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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-
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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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-
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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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-
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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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-
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- // Rendering
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- ImGui::Render();
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-
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- WGPURenderPassColorAttachment color_attachments = {};
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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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-
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- WGPUCommandEncoderDescriptor enc_desc = {};
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- WGPUCommandEncoder encoder = wgpuDeviceCreateCommandEncoder(wgpu_device, &enc_desc);
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-
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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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-
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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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-}
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-
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-static void print_glfw_error(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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-
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-static void print_wgpu_error(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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+ 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;
|
|
|
+ swap_chain_desc.width = width;
|
|
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+ swap_chain_desc.height = height;
|
|
|
+ swap_chain_desc.presentMode = WGPUPresentMode_Fifo;
|
|
|
+ wgpu_swap_chain = wgpuDeviceCreateSwapChain(wgpu_device, wgpu_surface, &swap_chain_desc);
|
|
|
}
|
ocornut