samien
/
three.js
spegling av https://github.com/mrdoob/three.js.git


			
				
					
						
						
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							<html lang="en">
	<head>
		<title>three.js webgpu - texture gather</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="example.css">
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org/" target="_blank" rel="noopener" class="logo-link"></a>

			<div class="title-wrapper">
				<a href="https://threejs.org/" target="_blank" rel="noopener">three.js</a><span>Texture Gather</span>
			</div>

			<small>
				This example demonstrates texture gather
				<br /> Left canvas is using WebGPU Backend, right canvas is WebGL Backend.
				<br /> The top half gathers color values and the bottom half gathers depth comparison.
			</small>
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.webgpu.js",
					"three/webgpu": "../build/three.webgpu.js",
					"three/tsl": "../build/three.tsl.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three/webgpu';
			import { If, vec4, uv, ivec2, texture, Fn } from 'three/tsl';

			// 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 );
				camera.position.z = 2;

				const scene = new THREE.Scene();

				// texture

				const material = new THREE.MeshBasicNodeMaterial( { color: 0xffffff } );

				const colorNode = texture();
				const depthNode = texture();

				material.colorNode = Fn( () => {

					const color = vec4( 1 ).toVar();

					const vuv = uv().toVar();

					If( vuv.y.greaterThan( 0.5 ), () => {

						color.assign(
							colorNode.sample( vuv.mul( 10 ) ).offset( ivec2( 0, 7 ) ).gather( 0 )
						);

					} ).Else( () => {

						color.assign(
							depthNode.sample( vuv ).offset( ivec2( 0, 7 ) ).gather( 0 ).compare( 1 )
						);

					} );

					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 } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth / 2, window.innerHeight );
				renderer.setAnimationLoop( animate );
				await renderer.init();

				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 );

				}

				//

				const depthTexture = new THREE.DepthTexture();
				depthTexture.compareFunction = THREE.LessEqualCompare;
				const rt = new THREE.RenderTarget( 100, 100, {
					depthTexture,
					generateMipmaps: true,
					minFilter: THREE.LinearMipmapLinearFilter
				} );
				rt.texture.wrapS = THREE.RepeatWrapping;
				rt.texture.wrapT = THREE.RepeatWrapping;

				const cameraZ = 2.5;
				const rtScene = new THREE.Scene();
				rtScene.background = new THREE.Color( 0x808080 );
				const rtCamera = new THREE.PerspectiveCamera( 50, 1, cameraZ - 0.5 * Math.sqrt( 3 ), cameraZ + 0.5 * Math.sqrt( 3 ) );
				rtCamera.position.z = cameraZ;

				const dirLight = new THREE.DirectionalLight();
				dirLight.position.set( 1, 1, 0 );
				rtScene.add( dirLight );
				rtScene.add( new THREE.AmbientLight( 0xffffff, 0.1 ) );

				const box = new THREE.Mesh(
					new THREE.BoxGeometry(),
					new THREE.MeshStandardNodeMaterial( { color: 0xff0000 } )
				);
				box.rotation.set( Math.PI / 4, Math.PI / 4, 0 );
				rtScene.add( box );

				renderer.setRenderTarget( rt );
				renderer.render( rtScene, rtCamera );
				renderer.setRenderTarget( null );

				colorNode.value = rt.texture;
				depthNode.value = rt.depthTexture;

				//

				function animate() {

					renderer.render( scene, camera );

				}

				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>