mirror of
https://github.com/Drezil/imgui.git
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Merge branch 'standalone-emscripten' of https://github.com/nicolasnoble/imgui
This commit is contained in:
omar
commit
622556719e
58
examples/example_emscripten/Makefile
Normal file
58
examples/example_emscripten/Makefile
Normal file
@ -0,0 +1,58 @@
|
||||
#
|
||||
# Makefile to use with emscripten
|
||||
# See https://emscripten.org/docs/getting_started/downloads.html
|
||||
# for installation instructions. This Makefile assumes you have
|
||||
# loaded emscripten's environment.
|
||||
#
|
||||
# Running `make` will produce three files:
|
||||
# - example_emscripten.html
|
||||
# - example_emscripten.js
|
||||
# - example_emscripten.wasm
|
||||
#
|
||||
# All three are needed to run the demo.
|
||||
|
||||
CC = emcc
|
||||
CXX = em++
|
||||
|
||||
EXE = example_emscripten.html
|
||||
SOURCES = main.cpp
|
||||
SOURCES += ../imgui_impl_sdl.cpp ../imgui_impl_opengl3.cpp
|
||||
SOURCES += ../../imgui.cpp ../../imgui_demo.cpp ../../imgui_draw.cpp ../../imgui_widgets.cpp
|
||||
OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
|
||||
UNAME_S := $(shell uname -s)
|
||||
|
||||
EMS = -s USE_SDL=2 -s USE_WEBGL2=1 -s WASM=1 -s FULL_ES3=1
|
||||
EMS += -s ALLOW_MEMORY_GROWTH=1 -s BINARYEN_TRAP_MODE=clamp
|
||||
EMS += -s DISABLE_EXCEPTION_CATCHING=1 -s EXIT_RUNTIME=1
|
||||
EMS += -s ASSERTIONS=1 -s SAFE_HEAP=1
|
||||
|
||||
CPPFLAGS = -I../ -I../../
|
||||
CPPFLAGS += -g -Wall -Wformat -O3
|
||||
CPPFLAGS += $(EMS)
|
||||
LIBS = $(EMS)
|
||||
LDFLAGS = --shell-file shell_minimal.html
|
||||
|
||||
##---------------------------------------------------------------------
|
||||
## BUILD RULES
|
||||
##---------------------------------------------------------------------
|
||||
|
||||
%.o:%.cpp
|
||||
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
|
||||
|
||||
%.o:../%.cpp
|
||||
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
|
||||
|
||||
%.o:../../%.cpp
|
||||
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
|
||||
|
||||
%.o:../libs/gl3w/GL/%.c
|
||||
$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<
|
||||
|
||||
all: $(EXE)
|
||||
@echo Build complete for $(EXE)
|
||||
|
||||
$(EXE): $(OBJS)
|
||||
$(CXX) -o $@ $^ $(LIBS) $(LDFLAGS)
|
||||
|
||||
clean:
|
||||
rm -f $(EXE) $(OBJS) *.js *.wasm
|
||||
8
examples/example_emscripten/README.md
Normal file
8
examples/example_emscripten/README.md
Normal file
@ -0,0 +1,8 @@
|
||||
|
||||
# How to Build
|
||||
|
||||
- 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
|
||||
|
||||
```
|
||||
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
|
||||
```
|
||||
165
examples/example_emscripten/main.cpp
Normal file
165
examples/example_emscripten/main.cpp
Normal file
@ -0,0 +1,165 @@
|
||||
// dear imgui: standalone example application for Emscripten, using SDL2 + OpenGL3
|
||||
// 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.
|
||||
//
|
||||
// If you are new to dear imgui, see examples/README.txt and documentation at the top of imgui.cpp.
|
||||
// (Emscripten is a C++-to-javascript compiler, used to publish executables for the web. See https://emscripten.org/)
|
||||
|
||||
#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 variables from main() to main_loop() here.
|
||||
// This will also hold some of our persistent data across loops. Remember: imgui is immediate mode, and doesn't store state.
|
||||
// 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.
|
||||
struct MainLoopVars {
|
||||
SDL_Window* window = NULL;
|
||||
SDL_GLContext gl_context = NULL;
|
||||
bool show_demo_window = true;
|
||||
bool show_another_window = false;
|
||||
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
|
||||
};
|
||||
|
||||
// For clarity, our main loop code is declared at the end.
|
||||
void main_loop(void*);
|
||||
|
||||
int main(int, char**)
|
||||
{
|
||||
MainLoopVars vars;
|
||||
|
||||
// Setup SDL
|
||||
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
|
||||
{
|
||||
printf("Error: %s\n", SDL_GetError());
|
||||
return -1;
|
||||
}
|
||||
|
||||
// For the browser using emscripten, we are going to use WebGL2 with GLES3. See the Makefile.emscripten 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 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, 3);
|
||||
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, ¤t);
|
||||
SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
|
||||
vars.window = SDL_CreateWindow("Dear ImGui SDL2+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
|
||||
vars.gl_context = SDL_GL_CreateContext(vars.window);
|
||||
if (!vars.gl_context) {
|
||||
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
|
||||
|
||||
// Setup Dear ImGui style
|
||||
ImGui::StyleColorsDark();
|
||||
//ImGui::StyleColorsClassic();
|
||||
|
||||
// Setup Platform/Renderer bindings
|
||||
ImGui_ImplSDL2_InitForOpenGL(vars.window, vars.gl_context);
|
||||
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 'misc/fonts/README.txt' 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 \\ !
|
||||
//io.Fonts->AddFontDefault();
|
||||
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
|
||||
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
|
||||
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
|
||||
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
|
||||
//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
|
||||
//IM_ASSERT(font != NULL);
|
||||
|
||||
// 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, &vars, 0, true);
|
||||
}
|
||||
|
||||
void main_loop(void* arg) {
|
||||
MainLoopVars* vars = (MainLoopVars*) arg;
|
||||
ImGuiIO& io = ImGui::GetIO();
|
||||
|
||||
// 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(vars->window);
|
||||
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 (vars->show_demo_window)
|
||||
ImGui::ShowDemoWindow(&vars->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", &vars->show_demo_window); // Edit bools storing our window open/close state
|
||||
ImGui::Checkbox("Another Window", &vars->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*)&vars->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 (vars->show_another_window)
|
||||
{
|
||||
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)
|
||||
ImGui::Text("Hello from another window!");
|
||||
if (ImGui::Button("Close Me"))
|
||||
vars->show_another_window = false;
|
||||
ImGui::End();
|
||||
}
|
||||
|
||||
// Rendering
|
||||
ImGui::Render();
|
||||
SDL_GL_MakeCurrent(vars->window, vars->gl_context);
|
||||
glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
|
||||
glClearColor(vars->clear_color.x, vars->clear_color.y, vars->clear_color.z, vars->clear_color.w);
|
||||
glClear(GL_COLOR_BUFFER_BIT);
|
||||
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
|
||||
SDL_GL_SwapWindow(vars->window);
|
||||
}
|
||||
153
examples/example_emscripten/shell_minimal.html
Normal file
153
examples/example_emscripten/shell_minimal.html
Normal file
@ -0,0 +1,153 @@
|
||||
<!doctype html>
|
||||
<html lang="en-us">
|
||||
<head>
|
||||
<meta charset="utf-8">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||||
<title>Emscripten-Generated Code</title>
|
||||
<style>
|
||||
.emscripten { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
|
||||
textarea.emscripten { font-family: monospace; width: 80%; }
|
||||
div.emscripten { text-align: center; }
|
||||
div.emscripten_border { border: 1px solid black; }
|
||||
/* the canvas *must not* have any border or padding, or mouse coords will be wrong */
|
||||
canvas.emscripten { border: 0px none; background-color: black; }
|
||||
|
||||
.spinner {
|
||||
height: 50px;
|
||||
width: 50px;
|
||||
margin: 0px auto;
|
||||
-webkit-animation: rotation .8s linear infinite;
|
||||
-moz-animation: rotation .8s linear infinite;
|
||||
-o-animation: rotation .8s linear infinite;
|
||||
animation: rotation 0.8s linear infinite;
|
||||
border-left: 10px solid rgb(0,150,240);
|
||||
border-right: 10px solid rgb(0,150,240);
|
||||
border-bottom: 10px solid rgb(0,150,240);
|
||||
border-top: 10px solid rgb(100,0,200);
|
||||
border-radius: 100%;
|
||||
background-color: rgb(200,100,250);
|
||||
}
|
||||
@-webkit-keyframes rotation {
|
||||
from {-webkit-transform: rotate(0deg);}
|
||||
to {-webkit-transform: rotate(360deg);}
|
||||
}
|
||||
@-moz-keyframes rotation {
|
||||
from {-moz-transform: rotate(0deg);}
|
||||
to {-moz-transform: rotate(360deg);}
|
||||
}
|
||||
@-o-keyframes rotation {
|
||||
from {-o-transform: rotate(0deg);}
|
||||
to {-o-transform: rotate(360deg);}
|
||||
}
|
||||
@keyframes rotation {
|
||||
from {transform: rotate(0deg);}
|
||||
to {transform: rotate(360deg);}
|
||||
}
|
||||
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<hr/>
|
||||
<figure style="overflow:visible;" id="spinner"><div class="spinner"></div><center style="margin-top:0.5em"><strong>emscripten</strong></center></figure>
|
||||
<div class="emscripten" id="status">Downloading...</div>
|
||||
<div class="emscripten">
|
||||
<progress value="0" max="100" id="progress" hidden=1></progress>
|
||||
</div>
|
||||
<div class="emscripten_border">
|
||||
<canvas class="emscripten" id="canvas" oncontextmenu="event.preventDefault()"></canvas>
|
||||
</div>
|
||||
<hr/>
|
||||
<div class="emscripten">
|
||||
<input type="checkbox" id="resize">Resize canvas
|
||||
<input type="checkbox" id="pointerLock" checked>Lock/hide mouse pointer
|
||||
|
||||
<input type="button" value="Fullscreen" onclick="Module.requestFullscreen(document.getElementById('pointerLock').checked,
|
||||
document.getElementById('resize').checked)">
|
||||
</div>
|
||||
|
||||
<hr/>
|
||||
<textarea class="emscripten" id="output" rows="8"></textarea>
|
||||
<hr>
|
||||
<script type='text/javascript'>
|
||||
var statusElement = document.getElementById('status');
|
||||
var progressElement = document.getElementById('progress');
|
||||
var spinnerElement = document.getElementById('spinner');
|
||||
|
||||
var Module = {
|
||||
preRun: [],
|
||||
postRun: [],
|
||||
print: (function() {
|
||||
var element = document.getElementById('output');
|
||||
if (element) element.value = ''; // clear browser cache
|
||||
return function(text) {
|
||||
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
|
||||
// These replacements are necessary if you render to raw HTML
|
||||
//text = text.replace(/&/g, "&");
|
||||
//text = text.replace(/</g, "<");
|
||||
//text = text.replace(/>/g, ">");
|
||||
//text = text.replace('\n', '<br>', 'g');
|
||||
console.log(text);
|
||||
if (element) {
|
||||
element.value += text + "\n";
|
||||
element.scrollTop = element.scrollHeight; // focus on bottom
|
||||
}
|
||||
};
|
||||
})(),
|
||||
printErr: function(text) {
|
||||
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
|
||||
if (0) { // XXX disabled for safety typeof dump == 'function') {
|
||||
dump(text + '\n'); // fast, straight to the real console
|
||||
} else {
|
||||
console.error(text);
|
||||
}
|
||||
},
|
||||
canvas: (function() {
|
||||
var canvas = document.getElementById('canvas');
|
||||
|
||||
// As a default initial behavior, pop up an alert when webgl context is lost. To make your
|
||||
// application robust, you may want to override this behavior before shipping!
|
||||
// See http://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15.2
|
||||
canvas.addEventListener("webglcontextlost", function(e) { alert('WebGL context lost. You will need to reload the page.'); e.preventDefault(); }, false);
|
||||
|
||||
return canvas;
|
||||
})(),
|
||||
setStatus: function(text) {
|
||||
if (!Module.setStatus.last) Module.setStatus.last = { time: Date.now(), text: '' };
|
||||
if (text === Module.setStatus.last.text) return;
|
||||
var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
|
||||
var now = Date.now();
|
||||
if (m && now - Module.setStatus.last.time < 30) return; // if this is a progress update, skip it if too soon
|
||||
Module.setStatus.last.time = now;
|
||||
Module.setStatus.last.text = text;
|
||||
if (m) {
|
||||
text = m[1];
|
||||
progressElement.value = parseInt(m[2])*100;
|
||||
progressElement.max = parseInt(m[4])*100;
|
||||
progressElement.hidden = false;
|
||||
spinnerElement.hidden = false;
|
||||
} else {
|
||||
progressElement.value = null;
|
||||
progressElement.max = null;
|
||||
progressElement.hidden = true;
|
||||
if (!text) spinnerElement.hidden = true;
|
||||
}
|
||||
statusElement.innerHTML = text;
|
||||
},
|
||||
totalDependencies: 0,
|
||||
monitorRunDependencies: function(left) {
|
||||
this.totalDependencies = Math.max(this.totalDependencies, left);
|
||||
Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
|
||||
}
|
||||
};
|
||||
Module.setStatus('Downloading...');
|
||||
window.onerror = function() {
|
||||
Module.setStatus('Exception thrown, see JavaScript console');
|
||||
spinnerElement.style.display = 'none';
|
||||
Module.setStatus = function(text) {
|
||||
if (text) Module.printErr('[post-exception status] ' + text);
|
||||
};
|
||||
};
|
||||
</script>
|
||||
{{{ SCRIPT }}}
|
||||
</body>
|
||||
</html>
|
||||
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Reference in New Issue
Block a user