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authorchai <chaifix@163.com>2021-12-13 00:07:19 +0800
committerchai <chaifix@163.com>2021-12-13 00:07:19 +0800
commit60cbbdec07ab7a5636eac5b3c024ae44e937f4d4 (patch)
treeb2c7b0a868f18159dbc43d8954e1bd7668549a88 /Client/ThirdParty/imgui/examples/example_emscripten_opengl3/main.cpp
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+// Dear ImGui: standalone example application for Emscripten, using SDL2 + OpenGL3
+// (Emscripten is a C++-to-javascript compiler, used to publish executables for the web. See https://emscripten.org/)
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// This is mostly the same code as the SDL2 + OpenGL3 example, simply with the modifications needed to run on Emscripten.
+// It is possible to combine both code into a single source file that will compile properly on Desktop and using Emscripten.
+// See https://github.com/ocornut/imgui/pull/2492 as an example on how to do just that.
+
+#include "imgui.h"
+#include "imgui_impl_sdl.h"
+#include "imgui_impl_opengl3.h"
+#include <stdio.h>
+#include <emscripten.h>
+#include <SDL.h>
+#include <SDL_opengles2.h>
+
+// Emscripten requires to have full control over the main loop. We're going to store our SDL book-keeping variables globally.
+// 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.
+SDL_Window* g_Window = NULL;
+SDL_GLContext g_GLContext = NULL;
+
+// For clarity, our main loop code is declared at the end.
+static void main_loop(void*);
+
+int main(int, char**)
+{
+ // Setup SDL
+ if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0)
+ {
+ printf("Error: %s\n", SDL_GetError());
+ return -1;
+ }
+
+ // For the browser using Emscripten, we are going to use WebGL1 with GL ES2. See the Makefile. for requirement details.
+ // It is very likely the generated file won't work in many browsers. Firefox is the only sure bet, but I have successfully
+ // run this code on Chrome for Android for example.
+ const char* glsl_version = "#version 100";
+ //const char* glsl_version = "#version 300 es";
+ SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
+ SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+ SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+ SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+
+ // Create window with graphics context
+ SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+ SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
+ SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
+ SDL_DisplayMode current;
+ SDL_GetCurrentDisplayMode(0, &current);
+ SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
+ g_Window = SDL_CreateWindow("Dear ImGui Emscripten example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
+ g_GLContext = SDL_GL_CreateContext(g_Window);
+ if (!g_GLContext)
+ {
+ fprintf(stderr, "Failed to initialize WebGL context!\n");
+ return 1;
+ }
+ SDL_GL_SetSwapInterval(1); // Enable vsync
+
+ // 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
+
+ // 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 = NULL;
+
+ // Setup Dear ImGui style
+ ImGui::StyleColorsDark();
+ //ImGui::StyleColorsClassic();
+
+ // Setup Platform/Renderer backends
+ ImGui_ImplSDL2_InitForOpenGL(g_Window, g_GLContext);
+ ImGui_ImplOpenGL3_Init(glsl_version);
+
+ // 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 NULL. 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.
+ // - 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/Roboto-Medium.ttf", 16.0f);
+ //io.Fonts->AddFontFromFileTTF("fonts/Cousine-Regular.ttf", 15.0f);
+ //io.Fonts->AddFontFromFileTTF("fonts/DroidSans.ttf", 16.0f);
+ //io.Fonts->AddFontFromFileTTF("fonts/ProggyTiny.ttf", 10.0f);
+ //ImFont* font = io.Fonts->AddFontFromFileTTF("fonts/ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+ //IM_ASSERT(font != NULL);
+#endif
+
+ // This function call won't return, and will engage in an infinite loop, processing events from the browser, and dispatching them.
+ emscripten_set_main_loop_arg(main_loop, NULL, 0, true);
+}
+
+static void main_loop(void* arg)
+{
+ ImGuiIO& io = ImGui::GetIO();
+ IM_UNUSED(arg); // We can pass this argument as the second parameter of emscripten_set_main_loop_arg(), but we don't use that.
+
+ // Our state (make them static = more or less global) as a convenience to keep the example terse.
+ static bool show_demo_window = true;
+ static bool show_another_window = false;
+ static ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
+
+ // 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.
+ // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
+ // 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);
+ // Capture events here, based on io.WantCaptureMouse and io.WantCaptureKeyboard
+ }
+
+ // Start the Dear ImGui frame
+ ImGui_ImplOpenGL3_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 created 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 / ImGui::GetIO().Framerate, ImGui::GetIO().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();
+ SDL_GL_MakeCurrent(g_Window, g_GLContext);
+ glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
+ glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
+ glClear(GL_COLOR_BUFFER_BIT);
+ ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+ SDL_GL_SwapWindow(g_Window);
+}