javascript
/
three.js
огледало од https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<html lang="en">
	<head>
		<title>three.js - WebGPU - Compute Ping/Pong Texture</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> WebGPU - Compute Ping/Pong Texture
			<br>Texture generated using GPU Compute.
		</div>

		<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>

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

		<script type="module">

			import * as THREE from 'three';
			import { texture, textureStore, wgslFn, code, instanceIndex } from 'three/nodes';

			import WebGPU from 'three/addons/capabilities/WebGPU.js';
			import WebGPURenderer from 'three/addons/renderers/webgpu/WebGPURenderer.js';
			import StorageTexture from 'three/addons/renderers/common/StorageTexture.js';

			let camera, scene, renderer;
			let computeToPing, computeToPong;
			let pingTexture, pongTexture;
			let material;
			let phase = true;

			init();
			render();

			function init() {

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

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

					throw new Error( 'No WebGPU support' );

				}

				const aspect = window.innerWidth / window.innerHeight;
				camera = new THREE.OrthographicCamera( - aspect, aspect, 1, - 1, 0, 2 );
				camera.position.z = 1;

				scene = new THREE.Scene();

				// texture

				const width = 512, height = 512;

				pingTexture = new StorageTexture( width, height );
				pongTexture = new StorageTexture( width, height );

				// compute init

				const rand2 = code( `
					fn rand2( n: vec2f ) -> f32 {

						return fract( sin( dot( n, vec2f( 12.9898, 4.1414 ) ) ) * 43758.5453 );

					}
				` );

				const computeInitWGSL = wgslFn( `
					fn computeInitWGSL( writeTex: texture_storage_2d<rgba8unorm, write>, index: u32 ) -> void {

						let posX = index % ${ width };
						let posY = index / ${ width };
						let indexUV = vec2u( posX, posY );
						let uv = getUV( posX, posY );

						textureStore( writeTex, indexUV, vec4f( vec3f( rand2( uv ) ), 1 ) );

					}

					fn getUV( posX: u32, posY: u32 ) -> vec2f {

						let uv = vec2f( f32( posX ) / ${ width }.0, f32( posY ) / ${ height }.0 );

						return uv;

					}
				`, [ rand2 ] );

				const computeInitNode = computeInitWGSL( { writeTex: textureStore( pingTexture ), index: instanceIndex } ).compute( width * height );

				// compute loop

				const computePingPongWGSL = wgslFn( `
					fn computePingPongWGSL( readTex: texture_2d<f32>, writeTex: texture_storage_2d<rgba8unorm, write>, index: u32 ) -> void {

						let posX = index % ${ width };
						let posY = index / ${ width };
						let indexUV = vec2u( posX, posY );

						let color = vec3f( rand2( textureLoad( readTex, indexUV, 0 ).xy ) );

						textureStore( writeTex, indexUV, vec4f( color, 1 ) );

					}
				`, [ rand2 ] );

				computeToPong = computePingPongWGSL( { readTex: texture( pingTexture ), writeTex: textureStore( pongTexture ), index: instanceIndex } ).compute( width * height );
				computeToPing = computePingPongWGSL( { readTex: texture( pongTexture ), writeTex: textureStore( pingTexture ), index: instanceIndex } ).compute( width * height );

				//

				material = new THREE.MeshBasicMaterial( { color: 0xffffff, map: pongTexture } );

				const plane = new THREE.Mesh( new THREE.PlaneGeometry( 1, 1 ), material );
				scene.add( plane );

				renderer = new WebGPURenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( render );
				document.body.appendChild( renderer.domElement );

				window.addEventListener( 'resize', onWindowResize );

				// compute init

				renderer.compute( computeInitNode );

			}

			function onWindowResize() {

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

				const aspect = window.innerWidth / window.innerHeight;

				const frustumHeight = camera.top - camera.bottom;

				camera.left = - frustumHeight * aspect / 2;
				camera.right = frustumHeight * aspect / 2;

				camera.updateProjectionMatrix();

				render();

			}

			function render() {

				// compute step

				renderer.compute( phase ? computeToPong : computeToPing );

				material.map = phase ? pongTexture : pingTexture;

				phase = ! phase;

				// render step

				// update material texture node

				renderer.render( scene, camera );

			}

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