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cube.html
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<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no'>
<meta name='mobile-web-app-capable' content='yes'>
<meta name='apple-mobile-web-app-capable' content='yes'>
<link rel="icon" type="image/png" sizes="48x48" href="favicon-48.png">
<link rel="icon" type="image/png" sizes="32x32" href="favicon-32.png">
<link rel="icon" type="image/png" sizes="16x16" href="favicon-16.png">
<meta itemprop="image" content="thumb.png">
<link rel="author" href="./humans.txt">
<title>WebGPU test</title>
<style>
html, body {
height: 100%;
margin: 0;
background-color: #000066;
}
canvas {
margin: 1em;
}
</style>
</head>
<body>
<canvas></canvas>
<button>Download Screenshot</button>
<script type="module">
import {mat4, vec3} from './js/third-party/gl-matrix/src/gl-matrix.js';
const depthFormat = "depth24plus";
const sampleCount = 4;
const uniformBufferSize = 4 * 16; // 4x4 matrix
const shaderSrc = `
struct Uniforms {
modelViewProjectionMatrix : mat4x4f
};
@group(0) @binding(0) var<uniform> uniforms : Uniforms;
struct VertexInput {
@location(0) position : vec4f,
@location(1) color : vec4f,
};
struct VertexOutput {
@location(0) color : vec4f,
@builtin(position) position : vec4f,
};
@vertex
fn vertMain(input : VertexInput) -> VertexOutput {
var output : VertexOutput;
output.color = input.color;
output.position = uniforms.modelViewProjectionMatrix * input.position;
return output;
}
@fragment
fn fragMain(@location(0) color : vec4f) -> @location(0) vec4f {
return color;
}
`;
const Cube = {
layout: {
arrayStride: 4 * 10, // Byte size of one cube vertex
attributes: [{
// position
shaderLocation: 0,
offset: 0,
format: "float32x4"
}, {
// color
shaderLocation: 1,
offset: 4 * 4,
format: "float32x4"
},
{
// UV
shaderLocation: 2,
offset: 4 * 8,
format: "float32x2"
}]
},
vertexCount: 36,
vertexArray: new Float32Array([
// float4 position, float4 color, float2 uv,
1, -1, 1, 1, 1, 0, 1, 1, 1, 1,
-1, -1, 1, 1, 0, 0, 1, 1, 0, 1,
-1, -1, -1, 1, 0, 0, 0, 1, 0, 0,
1, -1, -1, 1, 1, 0, 0, 1, 1, 0,
1, -1, 1, 1, 1, 0, 1, 1, 1, 1,
-1, -1, -1, 1, 0, 0, 0, 1, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, -1, 1, 1, 1, 0, 1, 1, 0, 1,
1, -1, -1, 1, 1, 0, 0, 1, 0, 0,
1, 1, -1, 1, 1, 1, 0, 1, 1, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, -1, -1, 1, 1, 0, 0, 1, 0, 0,
-1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 0, 1,
1, 1, -1, 1, 1, 1, 0, 1, 0, 0,
-1, 1, -1, 1, 0, 1, 0, 1, 1, 0,
-1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
1, 1, -1, 1, 1, 1, 0, 1, 0, 0,
-1, -1, 1, 1, 0, 0, 1, 1, 1, 1,
-1, 1, 1, 1, 0, 1, 1, 1, 0, 1,
-1, 1, -1, 1, 0, 1, 0, 1, 0, 0,
-1, -1, -1, 1, 0, 0, 0, 1, 1, 0,
-1, -1, 1, 1, 0, 0, 1, 1, 1, 1,
-1, 1, -1, 1, 0, 1, 0, 1, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-1, 1, 1, 1, 0, 1, 1, 1, 0, 1,
-1, -1, 1, 1, 0, 0, 1, 1, 0, 0,
-1, -1, 1, 1, 0, 0, 1, 1, 0, 0,
1, -1, 1, 1, 1, 0, 1, 1, 1, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, -1, -1, 1, 1, 0, 0, 1, 1, 1,
-1, -1, -1, 1, 0, 0, 0, 1, 0, 1,
-1, 1, -1, 1, 0, 1, 0, 1, 0, 0,
1, 1, -1, 1, 1, 1, 0, 1, 1, 0,
1, -1, -1, 1, 1, 0, 0, 1, 1, 1,
-1, 1, -1, 1, 0, 1, 0, 1, 0, 0,
])
};
let canvas;
let context;
let adapter;
let device;
let queue;
let contextFormat;
let vertexBuffer;
let colorTexture;
let depthTexture;
let pipeline;
let renderPassDescriptor;
let uniformBuffer;
let uniformBindGroup;
let viewMatrix = mat4.create();
let projectionMatrix = mat4.create();
let modelViewProjectionMatrix = mat4.create();
async function initWebGPU() {
canvas = document.querySelector('canvas');
adapter = await navigator.gpu.requestAdapter();
device = await adapter.requestDevice();
// Resize after getting the device to avoid Chrome bug.
canvas.width = canvas.height = 300;
context = canvas.getContext('webgpu');
contextFormat = 'bgra8unorm';
if ('getPreferredFormat' in context) {
contextFormat = context.getPreferredFormat(adapter);
}
context.configure({
device,
format: contextFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.COPY_SRC,
compositingAlphaMode: 'opaque'
});
// Quick patch for Firefox/Chrome compat difference
if (!device.queue) {
device.queue = device.defaultQueue;
}
vertexBuffer = device.createBuffer({
size: Cube.vertexArray.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(vertexBuffer, 0, Cube.vertexArray.buffer);
const shaderModule = device.createShaderModule({ code: shaderSrc });
pipeline = device.createRenderPipeline({
layout: 'auto',
vertex: {
module: shaderModule,
entryPoint: 'vertMain',
buffers: [Cube.layout],
},
fragment: {
module: shaderModule,
entryPoint: 'fragMain',
targets: [{
format: contextFormat,
}],
},
primitive: {
topology: 'triangle-list',
cullMode: 'back',
},
depthStencil: {
format: depthFormat,
depthWriteEnabled: true,
depthCompare: 'less',
},
multisample: { count: sampleCount, },
});
renderPassDescriptor = {
colorAttachments: [{
// view is acquired and set in render loop.
view: undefined,
resolveTarget: undefined,
clearValue: { r: 0.0, g: 0.5, b: 0.0, a: 1.0 },
loadOp: 'clear',
storeOp: 'store'
}],
depthStencilAttachment: {
// view is acquired and set in render loop.
view: undefined,
depthClearValue: 1.0,
depthLoadOp: 'clear',
depthStoreOp: 'store',
}
};
uniformBuffer = device.createBuffer({
size: uniformBufferSize,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST,
});
uniformBindGroup = device.createBindGroup({
layout: pipeline.getBindGroupLayout(0),
entries: [{
binding: 0,
resource: {
buffer: uniformBuffer,
},
}],
});
function onResize() {
context.configure({
device,
format: contextFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.COPY_SRC,
compositingAlphaMode: 'opaque'
});
colorTexture = device.createTexture({
size: {
width: canvas.width,
height: canvas.height,
},
sampleCount,
format: contextFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT,
});
renderPassDescriptor.colorAttachments[0].view = colorTexture.createView();
depthTexture = device.createTexture({
size: {
width: canvas.width,
height: canvas.height,
},
sampleCount,
format: depthFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT
});
renderPassDescriptor.depthStencilAttachment.view = depthTexture.createView();
const aspect = Math.abs(canvas.width / canvas.height);
mat4.perspective(projectionMatrix, Math.PI * 0.5, aspect, 0.1, 1000.0);
}
window.addEventListener('resize', onResize);
onResize();
window.requestAnimationFrame(onFrame);
}
function getTransformationMatrix() {
mat4.identity(viewMatrix);
mat4.translate(viewMatrix, viewMatrix, vec3.fromValues(0, 0, -5));
let now = Date.now() / 1000;
mat4.rotate(viewMatrix, viewMatrix, 1, vec3.fromValues(Math.sin(now), Math.cos(now), 0));
mat4.multiply(modelViewProjectionMatrix, projectionMatrix, viewMatrix);
return modelViewProjectionMatrix;
}
// This method of screenshotting a WebGPU context requires that the context be configured with
// GPUTextureUsage.COPY_SRC usage.
async function downloadTextureAsPng(device, texture, width, height) {
const bytesPerRow = Math.ceil((width * 4)/256) * 256;
const alignedSize = bytesPerRow * height;
const buffer = device.createBuffer({
size: alignedSize,
usage: GPUBufferUsage.MAP_READ | GPUBufferUsage.COPY_DST
});
const commandEncoder = device.createCommandEncoder({});
commandEncoder.copyTextureToBuffer(
{ texture },
{ buffer, bytesPerRow, rowsPerImage: height },
{ width, height });
device.queue.submit([commandEncoder.finish()]);
const alignedWidth = bytesPerRow / 4;
await buffer.mapAsync(GPUMapMode.READ);
const bufferArray = buffer.getMappedRange();
const imageData = new ImageData(new Uint8ClampedArray(bufferArray), alignedWidth, height);
// Create a new canvas with the image data
const canvas2D = document.createElement('canvas');
canvas2D.width = width;
canvas2D.height = height;
const ctx = canvas2D.getContext('2d');
ctx.putImageData(imageData, 0, 0);
// Useful for debugging
//document.body.appendChild(canvas2D);
// Note: Can't unmap until after you call putImageData!
buffer.unmap();
buffer.destroy();
// Create a download link
const a = document.createElement('a');
a.href = canvas2D.toDataURL();
a.download = `screenshot_${Date.now()}.png`;
a.innerText = 'Download';
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
}
let screenshot = false;
function onFrame() {
window.requestAnimationFrame(onFrame);
device.queue.writeBuffer(uniformBuffer, 0, getTransformationMatrix());
const commandEncoder = device.createCommandEncoder({});
const swapTexture = context.getCurrentTexture();
renderPassDescriptor.colorAttachments[0].resolveTarget = swapTexture.createView();
const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
passEncoder.setPipeline(pipeline);
passEncoder.setBindGroup(0, uniformBindGroup);
passEncoder.setVertexBuffer(0, vertexBuffer);
passEncoder.draw(Cube.vertexCount, 1, 0, 0);
passEncoder.end();
device.queue.submit([commandEncoder.finish()]);
}
initWebGPU();
const button = document.querySelector('button');
button.addEventListener('click', () => {
canvas.toBlob((blob) => {
const a = document.createElement('a');
a.href = window.URL.createObjectURL(blob);
a.download = `screenshot_${Date.now()}.png`;
a.innerText = 'Download';
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
});
});
</script>
</body>
</html>