javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<html lang="en">
	<head>
		<title>three.js - WebGPU - Compute</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">
		<!-- WebGPU (For Chrome 94-97), expires 10/11/2021 -->
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	</head>
	<body>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> WebGPU - Compute<br/>(Chrome Canary with flag: --enable-unsafe-webgpu)
		</div>

		<script type="importmap">
		{
			"imports": {
				"three": "../build/three.module.js"
			}
		}
		</script>
		<script type="module">

			import * as THREE from 'three';

			import WebGPURenderer from './jsm/renderers/webgpu/WebGPURenderer.js';
			import WebGPU from './jsm/renderers/webgpu/WebGPU.js';

			import WebGPUStorageBuffer from './jsm/renderers/webgpu/WebGPUStorageBuffer.js';
			import WebGPUUniformsGroup from './jsm/renderers/webgpu/WebGPUUniformsGroup.js';
			import { Vector2Uniform } from './jsm/renderers/webgpu/WebGPUUniform.js';

			import PositionNode from './jsm/renderers/nodes/accessors/PositionNode.js';
			import ColorNode from './jsm/renderers/nodes/inputs/ColorNode.js';
			import OperatorNode from './jsm/renderers/nodes/math/OperatorNode.js';

			let camera, scene, renderer;
			let pointer;

			const computeParams = [];

			init().then( animate ).catch( error );

			async function init() {

				if ( WebGPU.isAvailable() === false ) {

					document.body.appendChild( WebGPU.getErrorMessage() );

					throw 'No WebGPU support';

				}

				camera = new THREE.OrthographicCamera( - 1.0, 1.0, 1.0, - 1.0, 0, 1 );
				camera.position.z = 1;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x000000 );

				const particleNum = 50000; // 16-bit limit
				const particleSize = 3;

				const particleArray = new Float32Array( particleNum * particleSize );
				const velocityArray = new Float32Array( particleNum * particleSize );

				for ( let i = 0; i < particleArray.length; i += 3 ) {

					const r = Math.random() * 0.01 + 0.0005;
					const degree = Math.random() * 360;
					velocityArray[ i + 0 ] = r * Math.sin( degree * Math.PI / 180 );
					velocityArray[ i + 1 ] = r * Math.cos( degree * Math.PI / 180 );

				}

				const particleBuffer = new WebGPUStorageBuffer( 'particle', new THREE.BufferAttribute( particleArray, 3 ) );
				const velocityBuffer = new WebGPUStorageBuffer( 'velocity', new THREE.BufferAttribute( velocityArray, 3 ) );

				pointer = new THREE.Vector2( - 10.0, - 10.0 ); // Out of bounds first

				const pointerGroup = new WebGPUUniformsGroup( 'mouseUniforms' ).addUniform(
					new Vector2Uniform( 'pointer', pointer )
				);

				const computeBindings = [
					particleBuffer,
					velocityBuffer,
					pointerGroup
				];

				const computeShader = /* glsl */`#version 450
					#define PARTICLE_NUM ${particleNum}
					#define PARTICLE_SIZE ${particleSize}
					#define ROOM_SIZE 1.0
					#define POINTER_SIZE 0.1

					// Limitation for now: the order should be the same as bindings order

					layout(set = 0, binding = 0) buffer Particle {
						float particle[ PARTICLE_NUM * PARTICLE_SIZE ];
					} particle;

					layout(set = 0, binding = 1) buffer Velocity {
						float velocity[ PARTICLE_NUM * PARTICLE_SIZE ];
					} velocity;

					layout(set = 0, binding = 2) uniform MouseUniforms {
						vec2 pointer;
					} mouseUniforms;

					void main() {
						uint index = gl_GlobalInvocationID.x;
						if ( index >= PARTICLE_NUM ) { return; }

						vec3 position = vec3(
							particle.particle[ index * 3 + 0 ] + velocity.velocity[ index * 3 + 0 ],
							particle.particle[ index * 3 + 1 ] + velocity.velocity[ index * 3 + 1 ],
							particle.particle[ index * 3 + 2 ] + velocity.velocity[ index * 3 + 2 ]
						);

						if ( abs( position.x ) >= ROOM_SIZE ) {

							velocity.velocity[ index * 3 + 0 ] = - velocity.velocity[ index * 3 + 0 ];

						}

						if ( abs( position.y ) >= ROOM_SIZE ) {

							velocity.velocity[ index * 3 + 1 ] = - velocity.velocity[ index * 3 + 1 ];

						}

						if ( abs( position.z ) >= ROOM_SIZE ) {

							velocity.velocity[ index * 3 + 2 ] = - velocity.velocity[ index * 3 + 2 ];

						}

						float dx = mouseUniforms.pointer.x - position.x;
						float dy = mouseUniforms.pointer.y - position.y;
						float distanceFromPointer = sqrt( dx * dx + dy * dy );

						if ( distanceFromPointer <= POINTER_SIZE ) {

							position.x = 0.0;
							position.y = 0.0;
							position.z = 0.0;

						}

						particle.particle[ index * 3 + 0 ] = position.x;
						particle.particle[ index * 3 + 1 ] = position.y;
						particle.particle[ index * 3 + 2 ] = position.z;
					}
				`;

				computeParams.push( {
					num: particleNum,
					shader: computeShader,
					bindings: computeBindings
				} );

				// Use a compute shader to animate the point cloud's vertex data.

				const pointsGeometry = new THREE.BufferGeometry().setAttribute(
					'position', particleBuffer.attribute
				);

				const pointsMaterial = new THREE.PointsMaterial();
				pointsMaterial.colorNode = new OperatorNode( '+', new PositionNode(), new ColorNode( new THREE.Color( 0x0000FF ) ) );

				const mesh = new THREE.Points( pointsGeometry, pointsMaterial );
				scene.add( mesh );

				renderer = new WebGPURenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				document.body.appendChild( renderer.domElement );

				window.addEventListener( 'resize', onWindowResize );
				window.addEventListener( 'mousemove', onMouseMove );

				return renderer.init();

			}

			function onWindowResize() {

				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function onMouseMove( event ) {

				const x = event.clientX;
				const y = event.clientY;

				const width = window.innerWidth;
				const height = window.innerHeight;

				pointer.set(
					( x / width - 0.5 ) * 2.0,
					( - y / height + 0.5 ) * 2.0
				);

			}

			function animate() {

				requestAnimationFrame( animate );

				renderer.compute( computeParams );
				renderer.render( scene, camera );

			}

			function error( error ) {

				console.error( error );

			}

		</script>
	</body>
</html>