mirror of
https://github.com/greggman/twgl.js.git
synced 2025-12-08 19:26:07 +00:00
109 lines
3.3 KiB
HTML
109 lines
3.3 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf8">
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<!--
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@license twgl.js Copyright (c) 2015, Gregg Tavares All Rights Reserved.
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Available via the MIT license.
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see: http://github.com/greggman/twgl.js for details
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-->
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<meta property="og:title" content="TWGL.js - offscreencanvas" />
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<meta property="og:type" content="website" />
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<meta property="og:image" content="http://twgljs.org/examples/screenshots/offscreencanvas.png" />
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<meta property="og:description" content="TWGL.js - offscreencanvas" />
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<meta property="og:url" content="http://twgljs.org" />
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<meta name="twitter:card" content="summary_large_image">
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<meta name="twitter:site" content="@greggman">
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<meta name="twitter:creator" content="@greggman">
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<meta name="twitter:domain" content="twgljs.org">
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<meta name="twitter:title" content="TWGL.js - offscreencanvas">
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<meta name="twitter:url" content="http://twgljs.org/examples/offscreencanvas.html">
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<meta name="twitter:description" content="TWGL.js - offscreencanvas">
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<meta name="twitter:image:src" content="http://twgljs.org/examples/screenshots/offscreencanvas.png">
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<link href="/resources/images/twgljs-icon.png" rel="shortcut icon" type="image/png">
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<title>twgl.js - offscreencanvas</title>
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<style>
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html, body {
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margin: 0;
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font-family: monospace;
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height: 100%;
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}
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canvas {
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display: block;
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width: 100%;
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height: 100%;
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}
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#b {
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position: absolute;
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top: 10px;
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width: 100%;
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text-align: center;
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z-index: 2;
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}
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#no-webgl, #no-offscreencanvas {
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position: absolute;
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left: 0;
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top: 0;
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background: red;
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color: white;
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width: 100%;
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height: 100%;
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display: flex;
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justify-content: center;
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align-items: center;
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}
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</style>
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</head>
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<body>
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<canvas></canvas>
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<div id="b"><a href="http://twgljs.org">twgl.js</a> - offscreencanvas</div>
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<div id="no-webgl" style="display: none;">
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<div>Sorry but your browser doesn't appear to support WebGL</div>
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</div>
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<div id="no-offscreencanvas" style="display: none;">
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<div>
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<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>
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<div id="no-msg"></div>
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</div>
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</div>
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</body>
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<script type="module">
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function main() {
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const canvas = document.querySelector("canvas");
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if (!canvas.transferControlToOffscreen) {
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document.querySelector("#no-offscreencanvas").style.display = "";
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return;
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}
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const offscreen = canvas.transferControlToOffscreen();
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const worker = new Worker("js/offscreencanvas.js", {type: 'module'});
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worker.onmessage = function(evt) {
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document.querySelector('#no-msg').textContent = evt.data;
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document.querySelector("#no-webgl").style.display = "";
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};
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worker.postMessage({canvas: offscreen}, [offscreen]);
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function sendSize() {
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worker.postMessage({
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clientWidth: canvas.clientWidth,
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clientHeight: canvas.clientHeight,
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});
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}
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window.addEventListener('resize', sendSize);
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sendSize();
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}
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main();
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</script>
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</html>
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