2018-04-19 17:32:23 +02:00
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<!DOCTYPE html>
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<html>
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<head>
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<title>Conway's Game Of Life - AssemblyScript</title>
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<style>
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html, body { height: 100%; margin: 0; overflow: hidden; color: #111; background: #fff; font-family: sans-serif; }
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2018-04-19 17:49:44 +02:00
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h1 { padding: 20px; font-size: 12pt; margin: 0; }
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2018-04-19 17:32:23 +02:00
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a { color: #111; text-decoration: none; }
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a:hover { color: #851ba7; text-decoration: underline; }
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canvas { position: absolute; top: 60px; left: 20px; width: calc(100% - 40px); height: calc(100% - 80px); background: #eee; }
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</style>
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</head>
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<body>
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<h1>
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<a href="https://en.wikipedia.org/wiki/Conway's_Game_of_Life">Conway's Game Of Life</a> in
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<a href="http://assemblyscript.org">AssemblyScript</a>
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</h1>
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<canvas></canvas>
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<script>
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// Set up the canvas with a 2D rendering context
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var cnv = document.getElementsByTagName("canvas")[0];
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var ctx = cnv.getContext("2d");
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var bcr = cnv.getBoundingClientRect();
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// Compute the size of the universe (here: 2px per cell)
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var width = bcr.width >>> 1;
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var height = bcr.height >>> 1;
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var size = width * height;
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var byteSize = size + size; // input & output
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cnv.width = width;
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cnv.height = height;
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cnv.style = style = `
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image-rendering: optimizeSpeed;
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image-rendering: -moz-crisp-edges;
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image-rendering: -webkit-optimize-contrast;
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image-rendering: -o-crisp-edges;
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image-rendering: pixelated;
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-ms-interpolation-mode: nearest-neighbor;
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`;
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ctx.imageSmoothingEnabled = false;
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// Compute the size of and instantiate the module's memory
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var memory = new WebAssembly.Memory({ initial: ((byteSize + 0xffff) & ~0xffff) >>> 16 });
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// Fetch and instantiate the module
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fetch("build/optimized.wasm")
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.then(response => response.arrayBuffer())
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.then(buffer => WebAssembly.instantiate(buffer, {
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env: { memory: memory }
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}))
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.then(module => {
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var exports = module.instance.exports;
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// Tell the module about the universe's width and height
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exports.init(width, height);
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// Fill input at [0, s-1] with random live cells
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var mem = new Uint8Array(memory.buffer);
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for (var y = 0; y < height; ++y)
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for (var x = 0; x < width; ++x)
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mem[y * width + x] = Math.random() > 0.1 ? 0 : 1;
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// Update about 30 times a second
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(function update() {
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setTimeout(update, 1000 / 30);
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exports.step();
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mem.copyWithin(0, size, byteSize); // copy output to input
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})();
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// Keep rendering the output at [s, S]
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(function render() {
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requestAnimationFrame(render);
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var imageData = ctx.createImageData(width, height);
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var colors = new Uint32Array(imageData.data.buffer);
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for (let y = 0; y < height; ++y) {
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for (let x = 0; x < width; ++x) {
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if (mem[size + y * width + x]) colors[y * width + x] = 0xff851ba7;
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}
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}
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ctx.putImageData(imageData, 0, 0);
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})();
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}).catch(err => {
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2018-04-19 17:49:44 +02:00
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alert("Failed to load WASM: " + err.message + " (ad blocker, maybe?)");
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2018-04-19 17:32:23 +02:00
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throw err;
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});
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</script>
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</body>
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</html>
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