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- <html lang="en">
- <head>
- <title>three.js webgpu - storage pbo external element</title>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
- <link type="text/css" rel="stylesheet" href="main.css">
- </head>
- <body>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a>
- <br />This example demonstrates fetching an external element from a StorageBuffer.
- <br />The left canvas uses the WebGPU Backend, while the right uses the WebGL Backend.
- <div id="timestamps" style="
- position: absolute;
- top: 60px;
- left: 0;
- padding: 10px;
- background: rgba( 0, 0, 0, 0.5 );
- color: #fff;
- font-family: monospace;
- font-size: 12px;
- line-height: 1.5;
- pointer-events: none;
- text-align: left;
- "></div>
- <div id="timestamps_webgl" style="
- position: absolute;
- top: 60px;
- right: 0;
- padding: 10px;
- background: rgba( 0, 0, 0, 0.5 );
- color: #fff;
- font-family: monospace;
- font-size: 12px;
- line-height: 1.5;
- pointer-events: none;
- text-align: left;
- "></div>
- </div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.webgpu.js",
- "three/tsl": "../build/three.webgpu.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { storageObject, If, vec3, uv, uint, float, Fn, instanceIndex, workgroupBarrier } from 'three/tsl';
- const timestamps = {
- webgpu: document.getElementById( 'timestamps' ),
- webgl: document.getElementById( 'timestamps_webgl' )
- };
- // WebGPU Backend
- init();
- // WebGL Backend
- init( true );
- async function init( forceWebGL = false ) {
- const aspect = ( window.innerWidth / 2 ) / window.innerHeight;
- const camera = new THREE.OrthographicCamera( - aspect, aspect, 1, - 1, 0, 2 );
- camera.position.z = 1;
- const scene = new THREE.Scene();
- // texture
- const size = 32; // non power of two buffer size is not well supported in WebGPU
- const barCount = 32;
- const type = [ 'float', 'vec2', 'vec3', 'vec4' ];
- const arrayBufferNodes = [];
- for ( let i = 0; i < type.length; i ++ ) {
- const typeSize = i + 1;
- const array = new Array( size * typeSize ).fill( 0 );
- const arrayBuffer = new THREE.StorageInstancedBufferAttribute( new Float32Array( array ), typeSize );
- arrayBufferNodes.push( storageObject( arrayBuffer, type[ i ], size ) );
- }
- const computeInitOrder = Fn( () => {
- for ( let i = 0; i < type.length; i ++ ) {
- arrayBufferNodes[ i ].element( instanceIndex ).assign( instanceIndex );
- }
- } );
- const computeInvertOrder = Fn( () => {
- for ( let i = 0; i < type.length; i ++ ) {
- const invertIndex = arrayBufferNodes[ i ].element( uint( size - 1 ).sub( instanceIndex ) ).toVar();
- workgroupBarrier();
- arrayBufferNodes[ i ].element( instanceIndex ).assign( invertIndex );
- }
- } );
- // compute
- const computeInit = computeInitOrder().compute( size );
- const compute = computeInvertOrder().compute( size );
- const material = new THREE.MeshBasicNodeMaterial( { color: 0x00ff00 } );
- material.colorNode = Fn( () => {
- const index = uint( uv().x.mul( size ).floor() ).toVar();
- If( index.greaterThanEqual( size ), () => {
- index.assign( uint( size ).sub( 1 ) );
- } );
- const color = vec3( 0, 0, 0 ).toVar();
- If( uv().y.greaterThan( 0.0 ), () => {
- const indexValue = arrayBufferNodes[ 0 ].element( index ).toVar();
- const value = float( indexValue ).div( float( size ) ).mul( barCount ).floor().div( barCount );
-
- color.assign( vec3( value, 0, 0 ) );
- } );
- If( uv().y.greaterThan( 0.25 ), () => {
- const indexValue = arrayBufferNodes[ 1 ].element( index ).toVar();
- const value = float( indexValue ).div( float( size ) ).mul( barCount ).floor().div( barCount );
-
- color.assign( vec3( 0, value, 0 ) );
- } );
- If( uv().y.greaterThan( 0.5 ), () => {
- const indexValue = arrayBufferNodes[ 2 ].element( index ).toVar();
- const value = float( indexValue ).div( float( size ) ).mul( barCount ).floor().div( barCount );
-
- color.assign( vec3( 0, 0, value ) );
- } );
- If( uv().y.greaterThan( 0.75 ), () => {
- const indexValue = arrayBufferNodes[ 3 ].element( index ).toVar();
- const value = float( indexValue ).div( float( size ) ).mul( barCount ).floor().div( barCount );
-
- color.assign( vec3( value, value, value ) );
- } );
- return color;
- } )();
-
- //
- const plane = new THREE.Mesh( new THREE.PlaneGeometry( 1, 1 ), material );
- scene.add( plane );
- const renderer = new THREE.WebGPURenderer( { antialias: false, forceWebGL: forceWebGL, trackTimestamp: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth / 2, window.innerHeight );
- document.body.appendChild( renderer.domElement );
- renderer.domElement.style.position = 'absolute';
- renderer.domElement.style.top = '0';
- renderer.domElement.style.left = '0';
- renderer.domElement.style.width = '50%';
- renderer.domElement.style.height = '100%';
- if ( forceWebGL ) {
- renderer.domElement.style.left = '50%';
- scene.background = new THREE.Color( 0x212121 );
-
- } else {
- scene.background = new THREE.Color( 0x313131 );
- }
- await renderer.computeAsync( computeInit );
- //
- renderer.info.autoReset = false;
- const stepAnimation = async function () {
- renderer.info.reset();
- await renderer.computeAsync( compute );
- await renderer.renderAsync( scene, camera );
- timestamps[ forceWebGL ? 'webgl' : 'webgpu' ].innerHTML = `
- Compute ${renderer.info.compute.frameCalls} pass in ${renderer.info.compute.timestamp.toFixed( 6 )}ms<br>
- Draw ${renderer.info.render.drawCalls} pass in ${renderer.info.render.timestamp.toFixed( 6 )}ms`;
- setTimeout( stepAnimation, 1000 );
-
- };
- stepAnimation();
- window.addEventListener( 'resize', onWindowResize );
- function onWindowResize() {
- renderer.setSize( window.innerWidth / 2, window.innerHeight );
- const aspect = ( window.innerWidth / 2 ) / window.innerHeight;
- const frustumHeight = camera.top - camera.bottom;
- camera.left = - frustumHeight * aspect / 2;
- camera.right = frustumHeight * aspect / 2;
- camera.updateProjectionMatrix();
- renderer.render( scene, camera );
- }
- }
- </script>
- </body>
- </html>
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