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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - worker - offscreen canvas</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<link type="text/css" rel="stylesheet" href="main.css">
<style>
body {
background-color: #fff;
color: #444;
}
a {
color: #08f;
}
canvas {
display: inline-block;
}
#message {
color: #ff0000;
display: none;
}
#message > a {
color: #ff0000;
}
#container {
position: absolute;
top: 50px;
bottom: 70px;
width: 100%;
}
#ui {
position: absolute;
bottom: 20px;
width: 100%;
text-align: center;
}
#button {
border: 0;
padding: 4px 6px;
background: #dddddd;
outline: none;
}
</style>
</head>
<body>
<div id="info">
<a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> - offscreen canvas (<a href="https://developer.mozilla.org/en-US/docs/Web/API/OffscreenCanvas" target="_blank" rel="noopener noreferrer">about</a>)<br/>
<p id="message">Your browser does not support OffscreenCanvas. Check the browser support <a href="https://caniuse.com/#feat=offscreencanvas" target="_blank" rel="noopener noreferrer">here</a></p>
</div>
<div id="container">
<canvas id="canvas1" style="width: 50%; height: 100%"></canvas><canvas id="canvas2" style="width: 50%; height: 100%"></canvas>
</div>
<div id="ui">
<button id="button">START JANK</button><br/>
<span id="result"></span>
</div>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.8.0/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import initJank from 'three/addons/offscreen/jank.js';
import init from 'three/addons/offscreen/scene.js';
// onscreen
const canvas1 = document.getElementById( 'canvas1' );
const canvas2 = document.getElementById( 'canvas2' );
const width = canvas1.clientWidth;
const height = canvas1.clientHeight;
const pixelRatio = window.devicePixelRatio;
init( canvas1, width, height, pixelRatio, './' );
initJank();
// offscreen
if ( 'transferControlToOffscreen' in canvas2 ) {
const offscreen = canvas2.transferControlToOffscreen();
const worker = new Worker( 'jsm/offscreen/offscreen.js', { type: 'module' } );
worker.postMessage( {
drawingSurface: offscreen,
width: canvas2.clientWidth,
height: canvas2.clientHeight,
pixelRatio: window.devicePixelRatio,
path: '../../'
}, [ offscreen ] );
} else {
document.getElementById( 'message' ).style.display = 'block';
}
</script>
</body>
</html>