mirror of
https://github.com/webgpu/webgpufundamentals.git
synced 2026-05-16 06:50:37 -04:00
295 lines
8.3 KiB
HTML
295 lines
8.3 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>WebGPU Storage Buffer vertices</title>
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<style>
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@import url(resources/webgpu-lesson.css);
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html, body {
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margin: 0; /* remove the default margin */
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height: 100%; /* make the html,body fill the page */
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}
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canvas {
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display: block; /* make the canvas act like a block */
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width: 100%; /* make the canvas fill its container */
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height: 100%;
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}
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</style>
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</head>
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<body>
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<canvas></canvas>
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</body>
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<script type="module">
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// A random number between [min and max)
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// With 1 argument it will be [0 to min)
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// With no arguments it will be [0 to 1)
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const rand = (min, max) => {
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if (min === undefined) {
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min = 0;
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max = 1;
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} else if (max === undefined) {
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max = min;
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min = 0;
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}
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return min + Math.random() * (max - min);
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};
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function createCircleVertices({
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radius = 1,
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numSubdivisions = 24,
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innerRadius = 0,
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startAngle = 0,
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endAngle = Math.PI * 2,
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} = {}) {
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// 2 triangles per subdivision, 3 verts per tri, 2 values (xy) each.
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const numVertices = numSubdivisions * 3 * 2;
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const vertexData = new Float32Array(numSubdivisions * 2 * 3 * 2);
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let offset = 0;
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const addVertex = (x, y) => {
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vertexData[offset++] = x;
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vertexData[offset++] = y;
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};
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// 2 vertices per subdivision
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//
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// 0--1 4
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// | / /|
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// |/ / |
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// 2 3--5
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for (let i = 0; i < numSubdivisions; ++i) {
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const angle1 = startAngle + (i + 0) * (endAngle - startAngle) / numSubdivisions;
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const angle2 = startAngle + (i + 1) * (endAngle - startAngle) / numSubdivisions;
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const c1 = Math.cos(angle1);
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const s1 = Math.sin(angle1);
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const c2 = Math.cos(angle2);
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const s2 = Math.sin(angle2);
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// first triangle
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addVertex(c1 * radius, s1 * radius);
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addVertex(c2 * radius, s2 * radius);
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addVertex(c1 * innerRadius, s1 * innerRadius);
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// second triangle
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addVertex(c1 * innerRadius, s1 * innerRadius);
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addVertex(c2 * radius, s2 * radius);
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addVertex(c2 * innerRadius, s2 * innerRadius);
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}
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return {
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vertexData,
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numVertices,
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};
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}
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async function main() {
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const adapter = await navigator.gpu?.requestAdapter();
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const device = await adapter?.requestDevice();
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if (!device) {
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fail('need a browser that supports WebGPU');
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return;
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}
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// Get a WebGPU context from the canvas and configure it
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const canvas = document.querySelector('canvas');
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const context = canvas.getContext('webgpu');
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const presentationFormat = navigator.gpu.getPreferredCanvasFormat();
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context.configure({
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device,
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format: presentationFormat,
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});
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const module = device.createShaderModule({
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code: /* wgsl */ `
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struct OurStruct {
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color: vec4f,
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offset: vec2f,
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};
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struct OtherStruct {
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scale: vec2f,
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};
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struct Vertex {
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position: vec2f,
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};
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struct VSOutput {
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@builtin(position) position: vec4f,
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@location(0) color: vec4f,
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};
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@group(0) @binding(0) var<storage, read> ourStructs: array<OurStruct>;
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@group(0) @binding(1) var<storage, read> otherStructs: array<OtherStruct>;
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@group(0) @binding(2) var<storage, read> pos: array<Vertex>;
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@vertex fn vs(
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@builtin(vertex_index) vertexIndex : u32,
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@builtin(instance_index) instanceIndex: u32
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) -> VSOutput {
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let otherStruct = otherStructs[instanceIndex];
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let ourStruct = ourStructs[instanceIndex];
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var vsOut: VSOutput;
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vsOut.position = vec4f(
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pos[vertexIndex].position * otherStruct.scale + ourStruct.offset, 0.0, 1.0);
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vsOut.color = ourStruct.color;
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return vsOut;
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}
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@fragment fn fs(vsOut: VSOutput) -> @location(0) vec4f {
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return vsOut.color;
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}
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`,
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});
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const pipeline = device.createRenderPipeline({
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label: 'storage buffer vertices',
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layout: 'auto',
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vertex: {
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module,
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},
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fragment: {
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module,
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targets: [{ format: presentationFormat }],
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},
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});
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const kNumObjects = 100;
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const objectInfos = [];
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// create 2 storage buffers
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const staticUnitSize =
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4 * 4 + // color is 4 32bit floats (4bytes each)
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2 * 4 + // offset is 2 32bit floats (4bytes each)
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2 * 4; // padding
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const changingUnitSize =
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2 * 4; // scale is 2 32bit floats (4bytes each)
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const staticStorageBufferSize = staticUnitSize * kNumObjects;
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const changingStorageBufferSize = changingUnitSize * kNumObjects;
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const staticStorageBuffer = device.createBuffer({
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label: 'static storage for objects',
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size: staticStorageBufferSize,
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usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST,
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});
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const changingStorageBuffer = device.createBuffer({
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label: 'changing storage for objects',
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size: changingStorageBufferSize,
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usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST,
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});
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// offsets to the various uniform values in float32 indices
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const kColorOffset = 0;
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const kOffsetOffset = 4;
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const kScaleOffset = 0;
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{
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const staticStorageValues = new Float32Array(staticStorageBufferSize / 4);
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for (let i = 0; i < kNumObjects; ++i) {
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const staticOffset = i * (staticUnitSize / 4);
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// These are only set once so set them now
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staticStorageValues.set([rand(), rand(), rand(), 1], staticOffset + kColorOffset); // set the color
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staticStorageValues.set([rand(-0.9, 0.9), rand(-0.9, 0.9)], staticOffset + kOffsetOffset); // set the offset
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objectInfos.push({
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scale: rand(0.2, 0.5),
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});
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}
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device.queue.writeBuffer(staticStorageBuffer, 0, staticStorageValues);
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}
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// a typed array we can use to update the changingStorageBuffer
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const storageValues = new Float32Array(changingStorageBufferSize / 4);
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// setup a storage buffer with vertex data
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const { vertexData, numVertices } = createCircleVertices({
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radius: 0.5,
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innerRadius: 0.25,
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});
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const vertexStorageBuffer = device.createBuffer({
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label: 'storage buffer vertices',
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size: vertexData.byteLength,
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usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST,
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});
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device.queue.writeBuffer(vertexStorageBuffer, 0, vertexData);
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const bindGroup = device.createBindGroup({
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label: 'bind group for objects',
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layout: pipeline.getBindGroupLayout(0),
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entries: [
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{ binding: 0, resource: staticStorageBuffer },
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{ binding: 1, resource: changingStorageBuffer },
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{ binding: 2, resource: vertexStorageBuffer },
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],
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});
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const renderPassDescriptor = {
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label: 'our basic canvas renderPass',
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colorAttachments: [
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{
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// view: <- to be filled out when we render
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clearValue: [0.3, 0.3, 0.3, 1],
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loadOp: 'clear',
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storeOp: 'store',
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},
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],
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};
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function render() {
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// Get the current texture from the canvas context and
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// set it as the texture to render to.
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renderPassDescriptor.colorAttachments[0].view =
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context.getCurrentTexture().createView();
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const encoder = device.createCommandEncoder();
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const pass = encoder.beginRenderPass(renderPassDescriptor);
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pass.setPipeline(pipeline);
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// Set the uniform values in our JavaScript side Float32Array
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const aspect = canvas.width / canvas.height;
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// set the scales for each object
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objectInfos.forEach(({scale}, ndx) => {
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const offset = ndx * (changingUnitSize / 4);
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storageValues.set([scale / aspect, scale], offset + kScaleOffset); // set the scale
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});
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// upload all scales at once
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device.queue.writeBuffer(changingStorageBuffer, 0, storageValues);
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pass.setBindGroup(0, bindGroup);
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pass.draw(numVertices, kNumObjects);
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pass.end();
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const commandBuffer = encoder.finish();
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device.queue.submit([commandBuffer]);
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}
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const observer = new ResizeObserver(entries => {
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for (const entry of entries) {
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const canvas = entry.target;
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const width = entry.contentBoxSize[0].inlineSize;
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const height = entry.contentBoxSize[0].blockSize;
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canvas.width = Math.max(1, Math.min(width, device.limits.maxTextureDimension2D));
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canvas.height = Math.max(1, Math.min(height, device.limits.maxTextureDimension2D));
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// re-render
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render();
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}
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});
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observer.observe(canvas);
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}
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function fail(msg) {
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alert(msg);
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}
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main();
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</script>
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</html>
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