javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - KTX2 texture loader</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> - webgl - KTX2 texture loader<br />
			<a href="http://github.khronos.org/KTX-Specification/" target="_blank" rel="noopener">KTX2</a> with
			<a href="https://github.com/binomialLLC/basis_universal" target="_blank">Basis Universal GPU Texture Codec</a>
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import { KTX2Loader } from './jsm/loaders/KTX2Loader.js';
			import { OrbitControls } from './jsm/controls/OrbitControls.js';

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

			const renderer = new THREE.WebGLRenderer( { antialias: true } );
			renderer.setSize( width, height );
			renderer.outputEncoding = THREE.sRGBEncoding;
			document.body.appendChild( renderer.domElement );

			const scene = new THREE.Scene();
			scene.background = new THREE.Color( 0x202020 );

			const camera = new THREE.PerspectiveCamera( 60, width / height, 0.1, 100 );
			camera.position.set( 2, 1.5, 1 );
			camera.lookAt( scene.position );
			scene.add( camera );

			const controls = new OrbitControls( camera, renderer.domElement );
			controls.autoRotate = true;

			// PlaneGeometry UVs assume flipY=true, which compressed textures don't support.
			const geometry = flipY( new THREE.PlaneGeometry() );
			const material = new THREE.MeshBasicMaterial( {
				color: 0xFFFFFF,
				side: THREE.DoubleSide
			} );
			const mesh = new THREE.Mesh( geometry, material );
			scene.add( mesh );

			const formatStrings = {
				[ THREE.RGBAFormat ]: "RGBA32",
				[ THREE.RGBA_BPTC_Format ]: "RGBA_BPTC",
				[ THREE.RGBA_ASTC_4x4_Format ]: "RGBA_ASTC_4x4",
				[ THREE.RGB_S3TC_DXT1_Format ]: "RGB_S3TC_DXT1",
				[ THREE.RGBA_S3TC_DXT5_Format ]: "RGBA_S3TC_DXT5",
				[ THREE.RGB_PVRTC_4BPPV1_Format ]: "RGB_PVRTC_4BPPV1",
				[ THREE.RGBA_PVRTC_4BPPV1_Format ]: "RGBA_PVRTC_4BPPV1",
				[ THREE.RGB_ETC1_Format ]: "RGB_ETC1",
				[ THREE.RGB_ETC2_Format ]: "RGB_ETC2",
				[ THREE.RGBA_ETC2_EAC_Format ]: "RGB_ETC2_EAC",
			};

			// Samples: sample_etc1s.ktx2, sample_uastc.ktx2, sample_uastc_zstd.ktx2
			const loader = new KTX2Loader()
				.setTranscoderPath( 'js/libs/basis/' )
				.detectSupport( renderer );

			animate();

			try {

				const texture = await loader.loadAsync( './textures/compressed/sample_uastc_zstd.ktx2' );

				console.info( `transcoded to ${formatStrings[ texture.format ]}` );

				material.map = texture;
				material.transparent = true;

				material.needsUpdate = true;

			} catch ( e ) {

				console.error( e );

			} finally {

				loader.dispose();

			}

			function animate() {

				requestAnimationFrame( animate );

				controls.update();

				renderer.render( scene, camera );

			}

			window.addEventListener( 'resize', onWindowResize );

			function onWindowResize() {

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

				camera.aspect = width / height;
				camera.updateProjectionMatrix();
				renderer.setSize( width, height );

			}

			/** Correct UVs to be compatible with `flipY=false` textures. */
			function flipY( geometry ) {

				const uv = geometry.attributes.uv;

				for ( let i = 0; i < uv.count; i ++ ) {

					uv.setY( i, 1 - uv.getY( i ) );

				}

				return geometry;

			}

		</script>

	</body>
</html>