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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="user-scalable=0" />
<title>Interference effect - AssemblyScript</title>
<link rel="icon" href="https://assemblyscript.org/favicon.ico" type="image/x-icon"/>
<style>
html, body { height: 100%; margin: 0; overflow: hidden; color: #111; background: #fff; font-family: sans-serif; }
body { border-top: 2px solid #50ad7b; }
h1 { padding: 20px; font-size: 12pt; margin: 0; }
a { color: #111; text-decoration: none; }
a:hover { color: #0074C1; text-decoration: underline; }
canvas { position: absolute; top: 60px; left: 20px; width: calc(100% - 40px); height: calc(100% - 80px); background: #aff; }
</style>
</head>
<body>
<h1>
<a href="https://github.com/ColinEberhardt/wasm-interference">Interference effect</a> in <a href="http://assemblyscript.org">AssemblyScript</a> ( <a href="https://github.com/AssemblyScript/examples/blob/main/interference/assembly/index.ts">source</a> )
</h1>
<canvas id="canvas"></canvas>
<script>"use strict";
var step = 0.001;
WebAssembly.instantiateStreaming(fetch("build/optimized.wasm"), { Math })
.then(module => {
const exports = module.instance.exports;
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
var width, height, image;
function onresize() {
width = canvas.offsetWidth >>> 2;
height = canvas.offsetHeight >>> 2;
canvas.width = width;
canvas.height = height;
image = context.createImageData(width, height);
exports.resize(width, height);
}
onresize();
window.addEventListener("resize", onresize);
var tick = 0.0;
(function update() {
requestAnimationFrame(update);
exports.update(tick += step);
new Uint32Array(image.data.buffer).set(new Uint32Array(exports.memory.buffer, exports.offset, width * height));
context.putImageData(image, 0, 0);
})();
});
</script>
<style>
#warning { z-index: 10; position: absolute; top: 60px; left: 20px; width: calc(100% - 240px); height: calc(100% - 280px); background: rgba(0,0,0,0.95); text-align: center; color: #fff; padding: 100px; font-size: 200%; cursor: pointer;}
</style>
<div id="warning">
<p style="color: #f00">EPILEPSY WARNING</p>
<p style="text-align: justify">A very small percentage of individuals may experience epileptic seizures when exposed to certain light patterns or flashing lights. Exposure to certain patterns or backgrounds on a computer screen may induce an epileptic seizure in these individuals. Certain conditions may induce previously undetected epileptic symptoms even in persons who have no history of prior seizures or epilepsy.</p>
<p style="text-align: justify">If you experience any of the following symptoms while viewing - dizziness, altered vision, eye or muscle twitches, loss of awareness, disorientation, any involuntary movement, or convulsions - IMMEDIATELY discontinue use and consult your physician.</p>
<p>(click to continue)</p>
</div>
<script>
document.getElementById("warning").addEventListener("click", event => { document.body.removeChild(document.getElementById("warning")); step = 0.012 });
</script>
</body>
</html>