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195 lines
5.2 KiB
HTML
195 lines
5.2 KiB
HTML
2 months ago
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<html lang="en">
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<head>
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<title>three.js - WebGPU - Compute</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> WebGPU - Compute - 300000 Points
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</div>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.webgpu.js",
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"three/webgpu": "../build/three.webgpu.js",
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"three/tsl": "../build/three.tsl.js",
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"three/addons/": "./jsm/",
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"stats-gl": "https://cdn.jsdelivr.net/npm/stats-gl@3.6.0/dist/main.js"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import Stats from 'stats-gl';
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import { Fn, uniform, instancedArray, float, vec2, vec3, color, instanceIndex } from 'three/tsl';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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let camera, scene, renderer, stats;
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let computeNode;
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const pointerVector = new THREE.Vector2( - 10.0, - 10.0 ); // Out of bounds first
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const scaleVector = new THREE.Vector2( 1, 1 );
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init();
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function init() {
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camera = new THREE.OrthographicCamera( - 1.0, 1.0, 1.0, - 1.0, 0, 1 );
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camera.position.z = 1;
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scene = new THREE.Scene();
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// initialize particles
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const particlesCount = 300000;
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const particleArray = instancedArray( particlesCount, 'vec2' );
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const velocityArray = instancedArray( particlesCount, 'vec2' );
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// create function
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const computeShaderFn = Fn( () => {
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const particle = particleArray.element( instanceIndex );
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const velocity = velocityArray.element( instanceIndex );
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const pointer = uniform( pointerVector );
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const limit = uniform( scaleVector );
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const position = particle.add( velocity ).toVar();
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velocity.x = position.x.abs().greaterThanEqual( limit.x ).select( velocity.x.negate(), velocity.x );
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velocity.y = position.y.abs().greaterThanEqual( limit.y ).select( velocity.y.negate(), velocity.y );
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position.assign( position.min( limit ).max( limit.negate() ) );
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const pointerSize = 0.1;
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const distanceFromPointer = pointer.sub( position ).length();
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particle.assign( distanceFromPointer.lessThanEqual( pointerSize ).select( vec3(), position ) );
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} );
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// compute
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computeNode = computeShaderFn().compute( particlesCount );
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computeNode.onInit( ( { renderer } ) => {
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const precomputeShaderNode = Fn( () => {
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const particleIndex = float( instanceIndex );
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const randomAngle = particleIndex.mul( .005 ).mul( Math.PI * 2 );
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const randomSpeed = particleIndex.mul( 0.00000001 ).add( 0.0000001 );
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const velX = randomAngle.sin().mul( randomSpeed );
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const velY = randomAngle.cos().mul( randomSpeed );
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const velocity = velocityArray.element( instanceIndex );
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velocity.xy = vec2( velX, velY );
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} );
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renderer.computeAsync( precomputeShaderNode().compute( particlesCount ) );
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} );
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// use a compute shader to animate the point cloud's vertex data.
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const pointsGeometry = new THREE.BufferGeometry();
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pointsGeometry.setAttribute( 'position', new THREE.BufferAttribute( new Float32Array( 3 ), 3 ) ); // single vertex ( not triangle )
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pointsGeometry.drawRange.count = 1; // force render points as instances ( not triangle )
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const pointsMaterial = new THREE.PointsNodeMaterial();
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pointsMaterial.colorNode = particleArray.element( instanceIndex ).add( color( 0xFFFFFF ) );
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pointsMaterial.positionNode = particleArray.element( instanceIndex );
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const mesh = new THREE.Points( pointsGeometry, pointsMaterial );
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mesh.count = particlesCount;
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scene.add( mesh );
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renderer = new THREE.WebGPURenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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renderer.setAnimationLoop( animate );
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document.body.appendChild( renderer.domElement );
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stats = new Stats( {
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precision: 4,
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horizontal: false,
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trackGPU: true,
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trackCPT: true,
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logsPerSecond: 10,
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graphsPerSecond: 60,
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samplesGraph: 30,
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} );
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stats.init( renderer );
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document.body.appendChild( stats.dom );
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stats.dom.style.position = 'absolute';
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window.addEventListener( 'resize', onWindowResize );
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window.addEventListener( 'mousemove', onMouseMove );
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// gui
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const gui = new GUI();
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gui.add( scaleVector, 'x', 0, 1, 0.01 );
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gui.add( scaleVector, 'y', 0, 1, 0.01 );
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}
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function onWindowResize() {
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function onMouseMove( event ) {
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const x = event.clientX;
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const y = event.clientY;
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const width = window.innerWidth;
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const height = window.innerHeight;
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pointerVector.set(
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( x / width - 0.5 ) * 2.0,
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( - y / height + 0.5 ) * 2.0
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);
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}
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function animate() {
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renderer.compute( computeNode );
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renderer.resolveTimestampsAsync( THREE.TimestampQuery.COMPUTE );
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renderer.render( scene, camera );
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renderer.resolveTimestampsAsync().then( () => {
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stats.update();
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} );
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}
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</script>
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</body>
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</html>
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