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148 lines
3.9 KiB
148 lines
3.9 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - KTX2 texture loader</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl - KTX2 texture loader<br />
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<a href="http://github.khronos.org/KTX-Specification/" target="_blank" rel="noopener">KTX2</a> with
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<a href="https://github.com/binomialLLC/basis_universal" target="_blank">Basis Universal GPU Texture Codec</a>
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { KTX2Loader } from 'three/addons/loaders/KTX2Loader.js';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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const width = window.innerWidth;
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const height = window.innerHeight;
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const renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setSize( width, height );
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renderer.outputEncoding = THREE.sRGBEncoding;
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document.body.appendChild( renderer.domElement );
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const scene = new THREE.Scene();
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scene.background = new THREE.Color( 0x202020 );
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const camera = new THREE.PerspectiveCamera( 60, width / height, 0.1, 100 );
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camera.position.set( 2, 1.5, 1 );
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camera.lookAt( scene.position );
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scene.add( camera );
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const controls = new OrbitControls( camera, renderer.domElement );
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controls.autoRotate = true;
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// PlaneGeometry UVs assume flipY=true, which compressed textures don't support.
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const geometry = flipY( new THREE.PlaneGeometry() );
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const material = new THREE.MeshBasicMaterial( {
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color: 0xFFFFFF,
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side: THREE.DoubleSide
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} );
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const mesh = new THREE.Mesh( geometry, material );
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scene.add( mesh );
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const formatStrings = {
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[ THREE.RGBAFormat ]: 'RGBA32',
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[ THREE.RGBA_BPTC_Format ]: 'RGBA_BPTC',
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[ THREE.RGBA_ASTC_4x4_Format ]: 'RGBA_ASTC_4x4',
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[ THREE.RGB_S3TC_DXT1_Format ]: 'RGB_S3TC_DXT1',
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[ THREE.RGBA_S3TC_DXT5_Format ]: 'RGBA_S3TC_DXT5',
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[ THREE.RGB_PVRTC_4BPPV1_Format ]: 'RGB_PVRTC_4BPPV1',
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[ THREE.RGBA_PVRTC_4BPPV1_Format ]: 'RGBA_PVRTC_4BPPV1',
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[ THREE.RGB_ETC1_Format ]: 'RGB_ETC1',
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[ THREE.RGB_ETC2_Format ]: 'RGB_ETC2',
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[ THREE.RGBA_ETC2_EAC_Format ]: 'RGB_ETC2_EAC',
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};
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// Samples: sample_etc1s.ktx2, sample_uastc.ktx2, sample_uastc_zstd.ktx2
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const loader = new KTX2Loader()
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.setTranscoderPath( 'js/libs/basis/' )
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.detectSupport( renderer );
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animate();
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try {
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const texture = await loader.loadAsync( './textures/compressed/sample_uastc_zstd.ktx2' );
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console.info( `transcoded to ${formatStrings[ texture.format ]}` );
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material.map = texture;
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material.transparent = true;
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material.needsUpdate = true;
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} catch ( e ) {
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console.error( e );
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} finally {
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loader.dispose();
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}
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function animate() {
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requestAnimationFrame( animate );
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controls.update();
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renderer.render( scene, camera );
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}
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window.addEventListener( 'resize', onWindowResize );
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function onWindowResize() {
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const width = window.innerWidth;
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const height = window.innerHeight;
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camera.aspect = width / height;
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camera.updateProjectionMatrix();
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renderer.setSize( width, height );
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}
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/** Correct UVs to be compatible with `flipY=false` textures. */
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function flipY( geometry ) {
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const uv = geometry.attributes.uv;
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for ( let i = 0; i < uv.count; i ++ ) {
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uv.setY( i, 1 - uv.getY( i ) );
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}
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return geometry;
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}
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</script>
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</body>
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</html>
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