mirror of
https://github.com/fluencelabs/assemblyscript
synced 2025-04-25 15:12:12 +00:00
42 lines
1.2 KiB
TypeScript
42 lines
1.2 KiB
TypeScript
// A simplified version of the game of life as seen on http://dcode.io
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var w: u32, // width
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h: u32, // height
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s: u32; // total size
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/** Initializes width and height. */
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export function init(w_: u32, h_: u32): void {
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w = w_;
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h = h_;
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s = w * h;
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}
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/** Performs one step. */
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export function step(): void {
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var hm1 = h - 1,
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wm1 = w - 1;
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for (var y: u32 = 0; y < h; ++y) {
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var ym1 = select<u32>(hm1, y - 1, y == 0),
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yp1 = select<u32>(0, y + 1, y == hm1);
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for (var x: u32 = 0; x < w; ++x) {
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var xm1 = select<u32>(wm1, x - 1, x == 0),
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xp1 = select<u32>(0, x + 1, x == wm1);
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var n = (
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load<u8>(ym1 * w + xm1) + load<u8>(ym1 * w + x) + load<u8>(ym1 * w + xp1) +
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load<u8>(y * w + xm1) + load<u8>(y * w + xp1) +
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load<u8>(yp1 * w + xm1) + load<u8>(yp1 * w + x) + load<u8>(yp1 * w + xp1)
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);
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if (load<u8>(y * w + x)) {
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if (n < 2 || n > 3) {
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store<u8>(s + y * w + x, 0);
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}
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} else if (n == 3) {
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store<u8>(s + y * w + x, 1);
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}
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}
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}
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}
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// Performing a step uses bytes [0, s-1] as the input and writes the output to [s, 2*s-1].
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// Note that the code above wastes a lot of space by using one byte per cell.
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