Created
June 16, 2017 13:04
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wasm experiments
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>WASM</title> | |
| <style> | |
| html { | |
| height: 100%; | |
| } | |
| body { | |
| height: 100%; | |
| margin: 0; | |
| overflow: hidden; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas></canvas> | |
| <script> | |
| const canvas = document.querySelector('canvas') | |
| canvas.width = innerWidth | |
| canvas.height = innerHeight | |
| ctx = canvas.getContext('2d') | |
| ctx.fillStyle = 'black' | |
| ctx.fillRect(0, 0, canvas.width, canvas.height) | |
| const n = Math.round(innerHeight / 2) | |
| const importObj = {} | |
| const render = i32 => { | |
| ctx.fillStyle = 'rgba(0, 0, 0, 0.05)' | |
| ctx.fillRect(0, 0, canvas.width, canvas.height) | |
| const xs = i32.slice(0, n * 2) | |
| ctx.fillStyle = 'red' | |
| for (let i = 0; i < xs.length; i+=2) { | |
| ctx.fillRect(xs[i], xs[i + 1], 1, 1) | |
| } | |
| } | |
| fetch('test.wasm') | |
| .then(response => response.arrayBuffer()) | |
| .then(bytes => WebAssembly.instantiate(bytes, importObj)) | |
| .then(({instance}) => { | |
| const i32 = new Uint32Array(instance.exports.mem.buffer); | |
| for (let i = 0; i < n * 2; i+=2) { | |
| i32[i] = i | |
| i32[i + 1] = i | |
| } | |
| const renderLoop = () => { | |
| requestAnimationFrame(renderLoop) | |
| instance.exports.main(n * 2) | |
| render(i32) | |
| } | |
| requestAnimationFrame(renderLoop) | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| (module | |
| (memory (export "mem") 1) | |
| (func (export "main") (param $len i32) | |
| (local $end i32) | |
| (local $i i32) | |
| (local $j i32) | |
| i32.const 0 set_local $i | |
| i32.const 0 set_local $j | |
| get_local $len i32.const 4 i32.mul set_local $end | |
| (block $break (loop $top | |
| get_local $i get_local $end i32.eq br_if $break | |
| get_local $i i32.const 4 i32.add set_local $j | |
| get_local $i get_local $i i32.load i32.const 1 i32.add i32.store | |
| get_local $j get_local $j i32.load i32.const 1 i32.sub i32.store | |
| get_local $i i32.const 8 i32.add set_local $i | |
| br $top | |
| )) | |
| ) | |
| ) |
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| (module | |
| (memory (export "mem") 1) | |
| (func (export "main") (param $len i32) (result i32) | |
| (local $end i32) | |
| (local $sum i32) | |
| (local $i i32) i32.const 0 set_local $i | |
| get_local $len i32.const 4 i32.mul set_local $end | |
| (block $break (loop $top | |
| get_local $i get_local $end i32.eq br_if $break | |
| get_local $i i32.load get_local $sum i32.add set_local $sum | |
| get_local $i i32.const 4 i32.add set_local $i | |
| br $top | |
| )) | |
| get_local $sum | |
| ) | |
| ) |
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| (module | |
| (export "main" (func $main)) | |
| (func $main (param $n i32) (result i32) | |
| (local $sum i32) | |
| i32.const 0 set_local $sum | |
| (loop $loop | |
| get_local $n get_local $sum i32.add set_local $sum | |
| get_local $n i32.const 1 i32.sub set_local $n | |
| i32.const 1 get_local $n i32.lt_s br_if $loop) | |
| get_local $sum | |
| ) | |
| ) |
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