<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<title>Three.js - OffscreenCanvas</title>
<style>
html, body {
height: 100%;
margin: 0;
}
#c {
width: 100%;
height: 100%;
display: block;
}
#noOffscreenCanvas {
display: flex;
width: 100%;
height: 100%;
align-items: center;
justify-content: center;
background: red;
color: white;
}
</style>
</head>
<body>
<canvas id="c"></canvas>
<div id="noOffscreenCanvas" style="display:none;">
<div>no OffscreenCanvas support</div>
</div>
</body>
<script type="module">
function main() { /* eslint consistent-return: 0 */
const canvas = document.querySelector( '#c' );
if ( ! canvas.transferControlToOffscreen ) {
canvas.style.display = 'none';
document.querySelector( '#noOffscreenCanvas' ).style.display = '';
return;
}
const offscreen = canvas.transferControlToOffscreen();
const worker = new Worker( 'offscreencanvas-cubes.js', { type: 'module' } );
worker.postMessage( { type: 'main', canvas: offscreen }, [ offscreen ] );
function sendSize() {
worker.postMessage( {
type: 'size',
width: canvas.clientWidth,
height: canvas.clientHeight,
} );
}
window.addEventListener( 'resize', sendSize );
sendSize();
}
main();
</script>
</html>