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offscreencanvas.html
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offscreencanvas.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf8">
<!--
@license twgl.js Copyright (c) 2015, Gregg Tavares All Rights Reserved.
Available via the MIT license.
see: http://github.com/greggman/twgl.js for details
-->
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<meta property="og:title" content="TWGL.js - offscreencanvas" />
<meta property="og:type" content="website" />
<meta property="og:image" content="http://twgljs.org/examples/screenshots/offscreencanvas.png" />
<meta property="og:description" content="TWGL.js - offscreencanvas" />
<meta property="og:url" content="http://twgljs.org" />
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="@greggman">
<meta name="twitter:creator" content="@greggman">
<meta name="twitter:domain" content="twgljs.org">
<meta name="twitter:title" content="TWGL.js - offscreencanvas">
<meta name="twitter:url" content="http://twgljs.org/examples/offscreencanvas.html">
<meta name="twitter:description" content="TWGL.js - offscreencanvas">
<meta name="twitter:image:src" content="http://twgljs.org/examples/screenshots/offscreencanvas.png">
<link href="/resources/images/twgljs-icon.png" rel="shortcut icon" type="image/png">
<title>twgl.js - offscreencanvas</title>
<style>
body {
margin: 0;
font-family: monospace;
}
canvas {
display: block;
width: 100vw;
height: 100vh;
}
#b {
position: absolute;
top: 10px;
width: 100%;
text-align: center;
z-index: 2;
}
#no-webgl, #no-offscreencanvas {
position: absolute;
left: 0;
top: 0;
background: red;
color: white;
width: 100vw;
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
</style>
</head>
<body>
<canvas></canvas>
<div id="b"><a href="http://twgljs.org">twgl.js</a> - offscreencanvas</div>
<div id="no-webgl" style="display: none;">
<div>Sorry but your browser doesn't appear to support WebGL</div>
</div>
<div id="no-offscreencanvas" style="display: none;">
<div>
<div>Sorry but your browser doesn't appear to support <a href="https://developer.mozilla.org/en-US/docs/Web/API/OffscreenCanvas">OffscreenCanvas</a></div>
<div id="no-msg"></div>
</div>
</div>
</body>
<script>
"use strict";
function main() {
const canvas = document.querySelector("canvas");
if (!canvas.transferControlToOffscreen) {
document.querySelector("#no-offscreencanvas").style.display = "";
return;
}
const offscreen = canvas.transferControlToOffscreen();
const worker = new Worker("js/offscreencanvas.js");
worker.onmessage = function(evt) {
document.querySelector('#no-msg').textContent = evt.data;
document.querySelector("#no-webgl").style.display = "";
};
worker.postMessage({canvas: offscreen}, [offscreen]);
function sendSize() {
worker.postMessage({
clientWidth: canvas.clientWidth,
clientHeight: canvas.clientHeight,
});
}
window.addEventListener('resize', sendSize);
sendSize();
}
main();
</script>
</html>