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+// Dear ImGui: standalone example application for Emscripten, using GLFW + OpenGL3
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+// (Emscripten is a C++-to-javascript compiler, used to publish executables for the web. See https://emscripten.org/)
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+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
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+// Read online: https://github.com/ocornut/imgui/tree/master/docs
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+
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+// This is mostly the same code as the GLFW + OpenGL3 example, simply with the modifications needed to run on Emscripten.
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+// It is possible to combine both code into a single source file that will compile properly on Desktop and using Emscripten.
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+// See https://github.com/ocornut/imgui/pull/2492 as an example on how to do just that.
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+
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+#include "imgui.h"
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+#include "imgui_impl_glfw.h"
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+#include "imgui_impl_opengl3.h"
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+#include <stdio.h>
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+#include <emscripten.h>
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+#define GL_SILENCE_DEPRECATION
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+#if defined(IMGUI_IMPL_OPENGL_ES2)
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+#include <GLES2/gl2.h>
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+#endif
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+#include <GLFW/glfw3.h> // Will drag system OpenGL headers
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+
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+// Emscripten requires to have full control over the main loop. We're going to store our GLFW book-keeping variables globally.
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+// Having a single function that acts as a loop prevents us to store state in the stack of said function. So we need some location for this.
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+GLFWwindow* g_Window = NULL;
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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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+ fprintf(stderr, "Glfw Error %d: %s\n", error, description);
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+}
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+
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+// For clarity, our main loop code is declared at the end.
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+static void main_loop(void*);
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+
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+int main(int, char**)
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+{
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+ // Setup window
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+ glfwSetErrorCallback(glfw_error_callback);
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+ if (!glfwInit())
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+ return 1;
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+
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+ // For the browser using Emscripten, we are going to use WebGL1 with GL ES2. See the Makefile. for requirement details.
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+ // It is very likely the generated file won't work in many browsers. Firefox is the only sure bet, but I have successfully
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+ // run this code on Chrome for Android for example.
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+ const char* glsl_version = "#version 100";
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+ glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
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+ glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
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+ glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
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+
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+ // Create window with graphics context
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+ GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+Emscripten example", NULL, NULL);
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+ if (window == NULL)
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+ return 1;
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+ glfwMakeContextCurrent(window);
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+ glfwSwapInterval(1); // Enable vsync
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+ g_Window = window;
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+
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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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+
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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 = NULL;
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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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+
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+ // Setup Platform/Renderer backends
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+ ImGui_ImplGlfw_InitForOpenGL(window, true);
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+ ImGui_ImplOpenGL3_Init(glsl_version);
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+
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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 NULL. 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, NULL, io.Fonts->GetGlyphRangesJapanese());
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+ //IM_ASSERT(font != NULL);
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+#endif
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+
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+ // This function call won't return, and will engage in an infinite loop, processing events from the browser, and dispatching them.
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+ emscripten_set_main_loop_arg(main_loop, NULL, 0, true);
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+}
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+
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+static void main_loop(void* arg)
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+{
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+ IM_UNUSED(arg); // We can pass this argument as the second parameter of emscripten_set_main_loop_arg(), but we don't use that.
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+
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+ // Our state (make them static = more or less global) as a convenience to keep the example terse.
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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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+ // 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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+ // Start the Dear ImGui frame
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+ ImGui_ImplOpenGL3_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 / ImGui::GetIO().Framerate, ImGui::GetIO().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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+ int display_w, display_h;
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+ glfwGetFramebufferSize(g_Window, &display_w, &display_h);
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+ glViewport(0, 0, display_w, display_h);
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+ glClearColor(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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+ glClear(GL_COLOR_BUFFER_BIT);
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+ ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
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+
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+ glfwSwapBuffers(g_Window);
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+}
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ocornut