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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgpu - materials</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 - materials
		</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 * as TSL from 'three/tsl';

			import { Fn, wgslFn, positionLocal, scriptable, positionWorld, normalLocal, normalWorld, normalView, color, texture, uv, float, vec2, vec3, vec4, oscSine, triplanarTexture, screenUV, js, string, global, Loop, cameraProjectionMatrix } from 'three/tsl';

			import { TeapotGeometry } from 'three/addons/geometries/TeapotGeometry.js';

			import Stats from 'three/addons/libs/stats.module.js';

			let stats;

			let camera, scene, renderer;

			const objects = [], materials = [];

			init();

			function init() {

				const container = document.createElement( 'div' );
				document.body.appendChild( container );

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 2000 );
				camera.position.set( 0, 200, 800 );

				scene = new THREE.Scene();

				// Grid

				const helper = new THREE.GridHelper( 1000, 40, 0x303030, 0x303030 );
				helper.position.y = - 75;
				scene.add( helper );

				// Materials

				const textureLoader = new THREE.TextureLoader();

				const uvTexture = textureLoader.load( './textures/uv_grid_opengl.jpg' );
				uvTexture.wrapS = THREE.RepeatWrapping;
				uvTexture.wrapT = THREE.RepeatWrapping;

				const opacityTexture = textureLoader.load( './textures/alphaMap.jpg' );
				opacityTexture.wrapS = THREE.RepeatWrapping;
				opacityTexture.wrapT = THREE.RepeatWrapping;

				let material;

				//
				//	BASIC
				//

				// PositionLocal
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = positionLocal;
				materials.push( material );

				// PositionWorld
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = positionWorld;
				materials.push( material );

				// NormalLocal
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = normalLocal;
				materials.push( material );

				// NormalWorld
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = normalWorld;
				materials.push( material );

				// NormalView
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = normalView;
				materials.push( material );

				// Texture
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = texture( uvTexture );
				materials.push( material );

				// Opacity
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = color( 0x0099FF );
				material.opacityNode = texture( uvTexture );
				material.transparent = true;
				materials.push( material );

				// AlphaTest
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = texture( uvTexture );
				material.opacityNode = texture( opacityTexture );
				material.alphaTestNode = 0.5;
				materials.push( material );

				// camera
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = cameraProjectionMatrix.mul( positionLocal );
				materials.push( material );


				// Normal
				material = new THREE.MeshNormalMaterial();
				material.opacity = .5;
				material.transparent = true;
				materials.push( material );

				//
				//	ADVANCED
				//

				// Custom ShaderNode ( desaturate filter )

				const desaturateShaderNode = Fn( ( input ) => {

					return vec3( 0.299, 0.587, 0.114 ).dot( input.color.xyz );

				} );

				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = desaturateShaderNode( { color: texture( uvTexture ) } );
				materials.push( material );

				// Custom ShaderNode(no inputs) > Approach 2

				const desaturateNoInputsShaderNode = Fn( () => {

					return vec3( 0.299, 0.587, 0.114 ).dot( texture( uvTexture ).xyz );

				} );

				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = desaturateNoInputsShaderNode();
				materials.push( material );

				// Custom WGSL ( desaturate filter )

				const desaturateWGSLFn = wgslFn( `
					fn desaturate( color:vec3<f32> ) -> vec3<f32> {

						let lum = vec3<f32>( 0.299, 0.587, 0.114 );

						return vec3<f32>( dot( lum, color ) );

					}
				` );

				// include example

				const someWGSLFn = wgslFn( `
					fn someFn( color:vec3<f32> ) -> vec3<f32> {

						return desaturate( color );

					}
				`, [ desaturateWGSLFn ] );

				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = someWGSLFn( { color: texture( uvTexture ) } );
				materials.push( material );

				// Custom WGSL

				const getWGSLTextureSample = wgslFn( `
					fn getWGSLTextureSample( tex: texture_2d<f32>, tex_sampler: sampler, uv:vec2<f32> ) -> vec4<f32> {

						return textureSample( tex, tex_sampler, uv ) * vec4<f32>( 0.0, 1.0, 0.0, 1.0 );

					}
				` );

				const textureNode = texture( uvTexture );

				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = getWGSLTextureSample( { tex: textureNode, tex_sampler: textureNode, uv: uv() } );
				materials.push( material );

				// Triplanar Texture Mapping
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = triplanarTexture( texture( uvTexture ), null, null, float( .01 ) );
				materials.push( material );

				// Screen Projection Texture
				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = texture( uvTexture, screenUV.flipY() );
				materials.push( material );

				// Loop
				material = new THREE.MeshBasicNodeMaterial();
				materials.push( material );

				const loopCount = 10;
				material.colorNode = Loop( loopCount, ( { i } ) => {

					const output = vec4().temp();
					const scale = oscSine().mul( .09 ); // just a value to test

					const scaleI = scale.mul( i );
					const scaleINeg = scaleI.negate();

					const leftUV = uv().add( vec2( scaleI, 0 ) );
					const rightUV = uv().add( vec2( scaleINeg, 0 ) );
					const topUV = uv().add( vec2( 0, scaleI ) );
					const bottomUV = uv().add( vec2( 0, scaleINeg ) );

					output.assign( output.add( texture( uvTexture, leftUV ) ) );
					output.assign( output.add( texture( uvTexture, rightUV ) ) );
					output.assign( output.add( texture( uvTexture, topUV ) ) );
					output.assign( output.add( texture( uvTexture, bottomUV ) ) );

					return output.div( loopCount * 4 );

				} );

				// Scriptable

				global.set( 'THREE', THREE );
				global.set( 'TSL', TSL );

				const asyncNode = scriptable( js( `

					layout = {
						outputType: 'node'
					};

					const { float } = TSL;

					function init() {

						setTimeout( () => {

							local.set( 'result', float( 1.0 ) );

							refresh(); // refresh the node

						}, 1000 );

						return float( 0.0 );

					}

					function main() {

						const result = local.get( 'result', init );

						//console.log( 'result', result );

						return result;

					}

				` ) );

				const scriptableNode = scriptable( js( `

					layout = {
						outputType: 'node',
						elements: [
							{ name: 'source', inputType: 'node' },
							{ name: 'contrast', inputType: 'node' },
							{ name: 'vector3', inputType: 'Vector3' },
							{ name: 'message', inputType: 'string' },
							{ name: 'binary', inputType: 'ArrayBuffer' },
							{ name: 'object3d', inputType: 'Object3D' },
							{ name: 'execFrom', inputType: 'string' }
						]
					};

					const { saturation, float, oscSine, mul } = TSL;

					function helloWorld() {

						console.log( "Hello World!" );

					}

					function main() {

						const source = parameters.get( 'source' ) || float();
						const contrast = parameters.get( 'contrast' ) || float();

						const material = local.get( 'material' );

						//console.log( 'vector3', parameters.get( 'vector3' ) );

						if ( parameters.get( 'execFrom' ) === 'serialized' ) {

							//console.log( 'message', parameters.get( 'message' ).value );
							//console.log( 'binary', parameters.get( 'binary' ) );
							//console.log( 'object3d', parameters.get( 'object3d' ) ); // unserializable yet

							//console.log( global.get( 'renderer' ) );

						}

						if ( material ) material.needsUpdate = true;

						return mul( saturation( source, oscSine() ), contrast );

					}

					output = { helloWorld };

				` ) );

				scriptableNode.setParameter( 'source', texture( uvTexture ).xyz );
				scriptableNode.setParameter( 'contrast', asyncNode );
				scriptableNode.setParameter( 'vector3', vec3( new THREE.Vector3( 1, 1, 1 ) ) );
				scriptableNode.setParameter( 'message', string( 'Hello World!' ) );
				scriptableNode.setParameter( 'binary', new ArrayBuffer( 4 ) );
				scriptableNode.setParameter( 'object3d', new THREE.Group() );

				scriptableNode.call( 'helloWorld' );

				material = new THREE.MeshBasicNodeMaterial();
				material.colorNode = scriptableNode;
				materials.push( material );

				scriptableNode.setLocal( 'material', material );

				//
				// Geometry
				//

				const geometry = new TeapotGeometry( 50, 18 );

				for ( let i = 0, l = materials.length; i < l; i ++ ) {

					addMesh( geometry, materials[ i ] );

				}

				const serializeMesh = scene.children[ scene.children.length - 1 ];

				//

				renderer = new THREE.WebGPURenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				container.appendChild( renderer.domElement );

				//

				stats = new Stats();
				container.appendChild( stats.dom );

				//

				window.addEventListener( 'resize', onWindowResize );

				//

				setTimeout( () => testSerialization( serializeMesh ), 1000 );

			}

			function addMesh( geometry, material ) {

				const mesh = new THREE.Mesh( geometry, material );

				mesh.position.x = ( objects.length % 4 ) * 200 - 400;
				mesh.position.z = Math.floor( objects.length / 4 ) * 200 - 200;

				mesh.rotation.x = Math.random() * 200 - 100;
				mesh.rotation.y = Math.random() * 200 - 100;
				mesh.rotation.z = Math.random() * 200 - 100;

				objects.push( mesh );

				scene.add( mesh );

			}

			function moduleToLib( module ) {

				const lib = {};

				for ( const nodeElement of Object.values( module ) ) {

					if ( typeof nodeElement === 'function' && nodeElement.type !== undefined ) {

						lib[ nodeElement.type ] = nodeElement;

					}

				}

				return lib;

			}

			function testSerialization( mesh ) {

				const json = mesh.toJSON();
				const loader = new THREE.NodeObjectLoader().setNodes( moduleToLib( TSL ) ).setNodeMaterials( moduleToLib( THREE ) );
				const serializedMesh = loader.parse( json );

				serializedMesh.position.x = ( objects.length % 4 ) * 200 - 400;
				serializedMesh.position.z = Math.floor( objects.length / 4 ) * 200 - 200;

				const scriptableNode = serializedMesh.material.colorNode;

				// it's because local.get( 'material' ) is used in the example ( local/global is unserializable )
				scriptableNode.setLocal( 'material', serializedMesh.material );
				scriptableNode.setParameter( 'execFrom', 'serialized' );

				objects.push( serializedMesh );

				scene.add( serializedMesh );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

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

			}

			//

			function animate() {

				const timer = 0.0001 * Date.now();

				camera.position.x = Math.cos( timer ) * 1000;
				camera.position.z = Math.sin( timer ) * 1000;

				camera.lookAt( scene.position );

				for ( let i = 0, l = objects.length; i < l; i ++ ) {

					const object = objects[ i ];

					object.rotation.x += 0.01;
					object.rotation.y += 0.005;

				}

				renderer.render( scene, camera );

				stats.update();

			}

		</script>

	</body>
</html>