mirror of
https://github.com/ocornut/imgui.git
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Adding standalone Emscripten example.
This commit is contained in:
Nicolas "Pixel" Noble
parent
30d81f53cb
commit
a936d0669c
58
examples/example_emscripten/Makefile
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58
examples/example_emscripten/Makefile
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#
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# Makefile to use with emscripten
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# See https://emscripten.org/docs/getting_started/downloads.html
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# for installation instructions. This Makefile assumes you have
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# loaded emscripten's environment.
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#
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# Running `make` will produce three files:
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# - example_emscripten.html
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# - example_emscripten.js
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# - example_emscripten.wasm
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#
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# All three are needed to run the demo.
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CC = emcc
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CXX = em++
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EXE = example_emscripten.html
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SOURCES = main.cpp
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SOURCES += ../imgui_impl_sdl.cpp ../imgui_impl_opengl3.cpp
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SOURCES += ../../imgui.cpp ../../imgui_demo.cpp ../../imgui_draw.cpp ../../imgui_widgets.cpp
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OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
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UNAME_S := $(shell uname -s)
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EMS = -s USE_SDL=2 -s USE_WEBGL2=1 -s WASM=1 -s FULL_ES3=1
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EMS += -s ALLOW_MEMORY_GROWTH=1 -s BINARYEN_TRAP_MODE=clamp
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EMS += -s DISABLE_EXCEPTION_CATCHING=1 -s EXIT_RUNTIME=1
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EMS += -s ASSERTIONS=1 -s SAFE_HEAP=1
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CPPFLAGS = -I../ -I../../
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CPPFLAGS += -g -Wall -Wformat -O3
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CPPFLAGS += $(EMS)
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LIBS = $(EMS)
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LDFLAGS = --shell-file shell_minimal.html
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##---------------------------------------------------------------------
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## BUILD RULES
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##---------------------------------------------------------------------
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%.o:%.cpp
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$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
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%.o:../%.cpp
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$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
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%.o:../../%.cpp
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$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
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%.o:../libs/gl3w/GL/%.c
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$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<
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all: $(EXE)
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@echo Build complete for $(EXE)
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$(EXE): $(OBJS)
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$(CXX) -o $@ $^ $(LIBS) $(LDFLAGS)
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clean:
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rm -f $(EXE) $(OBJS) *.js *.wasm
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8
examples/example_emscripten/README.md
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8
examples/example_emscripten/README.md
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# How to Build
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- You need to install Emscripten from https://emscripten.org/docs/getting_started/downloads.html, and have the environment variables set, as described in https://emscripten.org/docs/getting_started/downloads.html#installation-instructions
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```
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em++ -I.. -I../.. main.cpp ../imgui_impl_sdl.cpp ../imgui_impl_opengl3.cpp ../../imgui*.cpp -s USE_SDL=2 -s USE_WEBGL2=1 -s WASM=1 -s FULL_ES3=1 -s ALLOW_MEMORY_GROWTH=1 -s BINARYEN_TRAP_MODE=clamp --shell-file shell_minimal.html -o example-emscripten.html
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```
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165
examples/example_emscripten/main.cpp
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165
examples/example_emscripten/main.cpp
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// dear imgui: standalone example application for Emscripten, using SDL2 + OpenGL3
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// This is mostly the same code as the SDL2 + 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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// If you are new to dear imgui, see examples/README.txt and documentation at the top of imgui.cpp.
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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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#include "imgui.h"
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#include "imgui_impl_sdl.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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#include <SDL.h>
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#include <SDL_opengles2.h>
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// Emscripten requires to have full control over the main loop. We're going to store variables from main() to main_loop() here.
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// This will also hold some of our persistent data across loops. Remember: imgui is immediate mode, and doesn't store state.
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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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struct MainLoopVars {
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SDL_Window* window = NULL;
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SDL_GLContext gl_context = NULL;
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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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// For clarity, our main loop code is declared at the end.
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void main_loop(void*);
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int main(int, char**)
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{
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MainLoopVars vars;
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// Setup SDL
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if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
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{
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printf("Error: %s\n", SDL_GetError());
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return -1;
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}
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// For the browser using emscripten, we are going to use WebGL2 with GLES3. See the Makefile.emscripten 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 300 es";
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
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// Create window with graphics context
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SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
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SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
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SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
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SDL_DisplayMode current;
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SDL_GetCurrentDisplayMode(0, ¤t);
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SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
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vars.window = SDL_CreateWindow("Dear ImGui SDL2+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
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vars.gl_context = SDL_GL_CreateContext(vars.window);
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if (!vars.gl_context) {
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fprintf(stderr, "Failed to initialize WebGL context!\n");
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return 1;
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}
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SDL_GL_SetSwapInterval(1); // Enable vsync
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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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// Setup Dear ImGui style
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ImGui::StyleColorsDark();
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//ImGui::StyleColorsClassic();
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// Setup Platform/Renderer bindings
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ImGui_ImplSDL2_InitForOpenGL(vars.window, vars.gl_context);
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ImGui_ImplOpenGL3_Init(glsl_version);
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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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// - Read 'misc/fonts/README.txt' 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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//io.Fonts->AddFontDefault();
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//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
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//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
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//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
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//io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
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//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
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//IM_ASSERT(font != NULL);
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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, &vars, 0, true);
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}
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void main_loop(void* arg) {
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MainLoopVars* vars = (MainLoopVars*) arg;
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ImGuiIO& io = ImGui::GetIO();
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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.
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// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
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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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SDL_Event event;
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while (SDL_PollEvent(&event))
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{
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ImGui_ImplSDL2_ProcessEvent(&event);
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// Capture events here, based on io.WantCaptureMouse and io.WantCaptureKeyboard
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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_ImplSDL2_NewFrame(vars->window);
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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 (vars->show_demo_window)
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ImGui::ShowDemoWindow(&vars->show_demo_window);
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// 2. Show a simple window that we create ourselves. We use a Begin/End pair to created 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", &vars->show_demo_window); // Edit bools storing our window open/close state
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ImGui::Checkbox("Another Window", &vars->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*)&vars->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 / ImGui::GetIO().Framerate, ImGui::GetIO().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 (vars->show_another_window)
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{
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ImGui::Begin("Another Window", &vars->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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vars->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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SDL_GL_MakeCurrent(vars->window, vars->gl_context);
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glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
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glClearColor(vars->clear_color.x, vars->clear_color.y, vars->clear_color.z, vars->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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SDL_GL_SwapWindow(vars->window);
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}
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153
examples/example_emscripten/shell_minimal.html
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153
examples/example_emscripten/shell_minimal.html
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<!doctype html>
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<html lang="en-us">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Emscripten-Generated Code</title>
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<style>
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.emscripten { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
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textarea.emscripten { font-family: monospace; width: 80%; }
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div.emscripten { text-align: center; }
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div.emscripten_border { border: 1px solid black; }
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/* the canvas *must not* have any border or padding, or mouse coords will be wrong */
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canvas.emscripten { border: 0px none; background-color: black; }
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.spinner {
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height: 50px;
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width: 50px;
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margin: 0px auto;
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-webkit-animation: rotation .8s linear infinite;
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-moz-animation: rotation .8s linear infinite;
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-o-animation: rotation .8s linear infinite;
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animation: rotation 0.8s linear infinite;
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border-left: 10px solid rgb(0,150,240);
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border-right: 10px solid rgb(0,150,240);
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border-bottom: 10px solid rgb(0,150,240);
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border-top: 10px solid rgb(100,0,200);
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border-radius: 100%;
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background-color: rgb(200,100,250);
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}
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@-webkit-keyframes rotation {
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from {-webkit-transform: rotate(0deg);}
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to {-webkit-transform: rotate(360deg);}
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}
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@-moz-keyframes rotation {
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from {-moz-transform: rotate(0deg);}
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to {-moz-transform: rotate(360deg);}
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}
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@-o-keyframes rotation {
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from {-o-transform: rotate(0deg);}
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to {-o-transform: rotate(360deg);}
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}
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@keyframes rotation {
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from {transform: rotate(0deg);}
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to {transform: rotate(360deg);}
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}
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</style>
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</head>
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<body>
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<hr/>
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<figure style="overflow:visible;" id="spinner"><div class="spinner"></div><center style="margin-top:0.5em"><strong>emscripten</strong></center></figure>
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<div class="emscripten" id="status">Downloading...</div>
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<div class="emscripten">
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<progress value="0" max="100" id="progress" hidden=1></progress>
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</div>
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<div class="emscripten_border">
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<canvas class="emscripten" id="canvas" oncontextmenu="event.preventDefault()"></canvas>
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</div>
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<hr/>
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<div class="emscripten">
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<input type="checkbox" id="resize">Resize canvas
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<input type="checkbox" id="pointerLock" checked>Lock/hide mouse pointer
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<input type="button" value="Fullscreen" onclick="Module.requestFullscreen(document.getElementById('pointerLock').checked,
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document.getElementById('resize').checked)">
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</div>
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<hr/>
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<textarea class="emscripten" id="output" rows="8"></textarea>
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<hr>
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<script type='text/javascript'>
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var statusElement = document.getElementById('status');
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var progressElement = document.getElementById('progress');
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var spinnerElement = document.getElementById('spinner');
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var Module = {
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preRun: [],
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postRun: [],
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print: (function() {
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var element = document.getElementById('output');
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if (element) element.value = ''; // clear browser cache
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return function(text) {
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if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
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// These replacements are necessary if you render to raw HTML
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//text = text.replace(/&/g, "&");
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//text = text.replace(/</g, "<");
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//text = text.replace(/>/g, ">");
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//text = text.replace('\n', '<br>', 'g');
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console.log(text);
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if (element) {
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element.value += text + "\n";
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element.scrollTop = element.scrollHeight; // focus on bottom
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}
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};
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})(),
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printErr: function(text) {
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if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
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if (0) { // XXX disabled for safety typeof dump == 'function') {
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dump(text + '\n'); // fast, straight to the real console
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} else {
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console.error(text);
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}
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},
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canvas: (function() {
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var canvas = document.getElementById('canvas');
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// As a default initial behavior, pop up an alert when webgl context is lost. To make your
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// application robust, you may want to override this behavior before shipping!
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// See http://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15.2
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canvas.addEventListener("webglcontextlost", function(e) { alert('WebGL context lost. You will need to reload the page.'); e.preventDefault(); }, false);
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return canvas;
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})(),
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setStatus: function(text) {
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if (!Module.setStatus.last) Module.setStatus.last = { time: Date.now(), text: '' };
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if (text === Module.setStatus.last.text) return;
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var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
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var now = Date.now();
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if (m && now - Module.setStatus.last.time < 30) return; // if this is a progress update, skip it if too soon
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Module.setStatus.last.time = now;
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Module.setStatus.last.text = text;
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if (m) {
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text = m[1];
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progressElement.value = parseInt(m[2])*100;
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progressElement.max = parseInt(m[4])*100;
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progressElement.hidden = false;
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spinnerElement.hidden = false;
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} else {
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progressElement.value = null;
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progressElement.max = null;
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progressElement.hidden = true;
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if (!text) spinnerElement.hidden = true;
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}
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statusElement.innerHTML = text;
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},
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totalDependencies: 0,
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monitorRunDependencies: function(left) {
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this.totalDependencies = Math.max(this.totalDependencies, left);
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Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
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}
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};
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Module.setStatus('Downloading...');
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window.onerror = function() {
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Module.setStatus('Exception thrown, see JavaScript console');
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spinnerElement.style.display = 'none';
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Module.setStatus = function(text) {
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if (text) Module.printErr('[post-exception status] ' + text);
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};
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};
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</script>
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||||
{{{ SCRIPT }}}
|
||||
</body>
|
||||
</html>
|
||||
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Reference in New Issue
Block a user