samien
/
three.js
зеркало из https://github.com/mrdoob/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 94-101), expires 09/01/2022 -->
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	</head>
	<body>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> WebGPU - Compute
		</div>

		<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>

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

		<script type="module">

			import * as THREE from 'three';
			import * as Nodes from 'three-nodes/Nodes.js';

			import {
				compute,
				color, add, uniform, element, storage, func,
				assign, float, mul,
				positionLocal, instanceIndex
			} from 'three-nodes/Nodes.js';

			import { GUI } from './jsm/libs/lil-gui.module.min.js';

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

			let camera, scene, renderer;
			let computeNode;

			const pointer = new THREE.Vector2( - 10.0, - 10.0 ); // Out of bounds first
			const scaleVector = new THREE.Vector2( 1, 1 );

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

			async function init() {

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

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

					throw new Error( '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();

				// initialize particles

				const particleNum = 65000; // 16-bit limit
				const particleSize = 3; // vec3

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

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

					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 );

				}

				// create buffers

				const particleBuffer = new THREE.BufferAttribute( particleArray, particleSize );
				const velocityBuffer = new THREE.BufferAttribute( velocityArray, particleSize );

				const particleBufferNode = storage( particleBuffer, 'vec3' );
				const velocityBufferNode = storage( velocityBuffer, 'vec3' );

				// create wgsl function

				const WGSLFnNode = func( `( pointer:vec2<f32>, limit:vec2<f32> ) {

						var position = particle + velocity;

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

							if ( position.x > 0.0 ) {

								position.x = limit.x;

							} else {

								position.x = -limit.x;

							}

							velocity.x = - velocity.x;

						}

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

							if ( position.y > 0.0 ) {

								position.y = limit.y;

							} else {

								position.y = -limit.y;

							}

							velocity.y = - velocity.y ;

						}

						let POINTER_SIZE = .1;

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

						if ( distanceFromPointer <= POINTER_SIZE ) {

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

						}

						particle = position;

					}
				` );

				// define particle and velocity keywords in wgsl function
				// it's used in case of needed change a global variable like this storageBuffer

				const particleNode = element( particleBufferNode, instanceIndex );
				const velocityNode = element( velocityBufferNode, instanceIndex );

				WGSLFnNode.keywords[ 'particle' ] = particleNode;
				WGSLFnNode.keywords[ 'velocity' ] = velocityNode;

				// compute

				computeNode = compute( particleNum );

				// Example 1: Calling a WGSL function

				computeNode.computeNode = WGSLFnNode.call( {
					pointer: uniform( pointer ),
					limit: uniform( scaleVector )
				} );

				// Example 2: Creating single storage assign

				//computeNode.computeNode = assign( particleNode, add( particleNode, velocityNode ) );

				// Example 3: Creating multiples storage assign

				/*computeNode.computeNode = new Nodes.ShaderNode( ( {}, builder ) => {

					assign( particleNode, add( particleNode, velocityNode ) ).build( builder );
					assign( velocityNode, mul( velocityNode, float( 0.99 ) ) ).build( builder );

				} );/**/

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

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

				const pointsMaterial = new Nodes.PointsNodeMaterial();
				pointsMaterial.colorNode = add( positionLocal, color( 0xFFFFFF ) );

				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 );

				// gui

				const gui = new GUI();

				gui.add( scaleVector, 'x', 0, 1, 0.01 );
				gui.add( scaleVector, 'y', 0, 1, 0.01 );

				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( computeNode );
				renderer.render( scene, camera );

			}

			function error( error ) {

				console.error( error );

			}

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