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Fixed bug when using the same Buffer for input and output. Added a te…
…st/example.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| <!doctype html> | ||
| <html> | ||
| <head> | ||
| <title>Greyscale</title> | ||
| <style> | ||
| body {font-family:sans-serif;} | ||
| div {float:left; margin:10px;} | ||
| canvas, button, span {display:block;} | ||
| button, span {width:400px; padding:4px 0; margin-top:20px;} | ||
| </style> | ||
| <script src="../dist/blink.js"></script> | ||
| </head> | ||
| <body> | ||
| <script> | ||
| const kernelSource = ` | ||
| void main() { | ||
| highp uvec4 color = texture(in_color, bl_UV); | ||
| highp uint grey = (color.r + color.g + color.b) / 3u; | ||
| out_color = uvec4(grey, grey, grey, color.a); | ||
| }` | ||
|
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||
|
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||
| makeTest('Buffer', function (ctx) { | ||
| // Get the canvas data. | ||
| let imageData = ctx.getImageData(0, 0, ctx.canvas.width, ctx.canvas.height) | ||
|
|
||
| // Create buffer. | ||
| let buffer = new blink.Buffer({ | ||
| data: imageData.data, | ||
| vector: 4 | ||
| }) | ||
|
|
||
| let kernel = new blink.Kernel({ | ||
| input: { in_color: buffer }, | ||
| output: { out_color: buffer } | ||
| }, kernelSource) | ||
|
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||
| kernel.exec() | ||
|
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| ctx.putImageData(imageData, 0, 0) | ||
|
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||
| // Clean up. | ||
| kernel.delete() | ||
| }) | ||
|
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||
| makeTest('DeviceBuffer', function (ctx) { | ||
| let imageData = ctx.getImageData(0, 0, ctx.canvas.width, ctx.canvas.height) | ||
|
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||
| let buffer = new blink.DeviceBuffer({ | ||
| data: imageData.data, | ||
| vector: 4 | ||
| }) | ||
|
|
||
| let kernel = new blink.Kernel({ | ||
| input: { in_color: buffer }, | ||
| output: { out_color: buffer } | ||
| }, kernelSource) | ||
|
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| kernel.exec() | ||
|
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| // Download to the original ImageData object. | ||
| buffer.toHost(imageData.data) | ||
|
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| ctx.putImageData(imageData, 0, 0) | ||
|
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||
| // Clean up. | ||
| kernel.delete() | ||
| buffer.delete() | ||
| }) | ||
|
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|
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| function makeTest(title, onClick) { | ||
| let div = document.createElement('div') | ||
|
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| let h1 = document.createElement('h1') | ||
| h1.textContent = title | ||
| div.appendChild(h1) | ||
|
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| let canvas = document.createElement('canvas') | ||
| canvas.width = canvas.height = 400 | ||
| div.appendChild(canvas) | ||
|
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| let rect = [0, 0, canvas.width, canvas.height] | ||
|
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||
| // Draw on the canvas. | ||
| const ctx = canvas.getContext('2d') | ||
| let gradient = ctx.createLinearGradient(0, 0, 0, canvas.height) | ||
| gradient.addColorStop(0, 'rgb(255, 0, 0)') | ||
| gradient.addColorStop(0.2, 'rgb(255, 255, 0)') | ||
| gradient.addColorStop(0.4, 'rgb(0, 255, 0)') | ||
| gradient.addColorStop(0.6, 'rgb(0, 255, 255)') | ||
| gradient.addColorStop(0.8, 'rgb(0, 0, 255)') | ||
| gradient.addColorStop(1, 'rgb(255, 0, 255)') | ||
| ctx.fillStyle = gradient | ||
| ctx.fillRect(...rect) | ||
|
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||
| const text = `blink.js ${blink.VERSION}` | ||
| ctx.fillStyle = 'rgb(0, 255, 0)' | ||
| ctx.font = '50px sans-serif' | ||
| ctx.textAlign = 'center' | ||
| ctx.textBaseline = 'top' | ||
| ctx.lineWidth = 4 | ||
| ctx.strokeStyle = 'white' | ||
| ctx.strokeText(text, canvas.width / 2, (canvas.height - 50) / 2) | ||
| ctx.fillText(text, canvas.width / 2, (canvas.height - 50) / 2) | ||
|
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||
| // Button. | ||
| let button = document.createElement('button') | ||
| button.textContent = 'Greyscale' | ||
|
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| button.addEventListener('click', function () { | ||
| let then = performance.now() | ||
| onClick(ctx) | ||
| button.remove() | ||
| span.textContent = `${performance.now() - then} ms` | ||
| }) | ||
|
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| div.appendChild(button) | ||
|
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| let span = document.createElement('span') | ||
| div.appendChild(span) | ||
|
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| document.body.appendChild(div) | ||
| } | ||
| </script> | ||
| </body> | ||
| </html> |