Initial commit
This commit is contained in:
591
HTML/ThreeJS/node_modules/three/examples/jsm/loaders/KTX2Loader.js
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591
HTML/ThreeJS/node_modules/three/examples/jsm/loaders/KTX2Loader.js
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/**
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* Loader for KTX 2.0 GPU Texture containers.
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*
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* KTX 2.0 is a container format for various GPU texture formats. The loader
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* supports Basis Universal GPU textures, which can be quickly transcoded to
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* a wide variety of GPU texture compression formats. While KTX 2.0 also allows
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* other hardware-specific formats, this loader does not yet parse them.
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*
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* References:
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* - KTX: http://github.khronos.org/KTX-Specification/
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* - DFD: https://www.khronos.org/registry/DataFormat/specs/1.3/dataformat.1.3.html#basicdescriptor
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*/
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import {
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CompressedTexture,
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FileLoader,
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LinearEncoding,
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LinearFilter,
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LinearMipmapLinearFilter,
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Loader,
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RGBAFormat,
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RGBA_ASTC_4x4_Format,
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RGBA_BPTC_Format,
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RGBA_ETC2_EAC_Format,
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RGBA_PVRTC_4BPPV1_Format,
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RGBA_S3TC_DXT5_Format,
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RGB_ETC1_Format,
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RGB_ETC2_Format,
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RGB_PVRTC_4BPPV1_Format,
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RGB_S3TC_DXT1_Format,
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sRGBEncoding,
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UnsignedByteType
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} from 'three';
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import { WorkerPool } from '../utils/WorkerPool.js';
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const KTX2TransferSRGB = 2;
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const KTX2_ALPHA_PREMULTIPLIED = 1;
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const _taskCache = new WeakMap();
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let _activeLoaders = 0;
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class KTX2Loader extends Loader {
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constructor( manager ) {
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super( manager );
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this.transcoderPath = '';
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this.transcoderBinary = null;
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this.transcoderPending = null;
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this.workerPool = new WorkerPool();
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this.workerSourceURL = '';
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this.workerConfig = null;
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if ( typeof MSC_TRANSCODER !== 'undefined' ) {
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console.warn(
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'THREE.KTX2Loader: Please update to latest "basis_transcoder".'
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+ ' "msc_basis_transcoder" is no longer supported in three.js r125+.'
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);
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}
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}
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setTranscoderPath( path ) {
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this.transcoderPath = path;
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return this;
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}
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setWorkerLimit( num ) {
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this.workerPool.setWorkerLimit( num );
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return this;
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}
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detectSupport( renderer ) {
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this.workerConfig = {
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astcSupported: renderer.extensions.has( 'WEBGL_compressed_texture_astc' ),
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etc1Supported: renderer.extensions.has( 'WEBGL_compressed_texture_etc1' ),
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etc2Supported: renderer.extensions.has( 'WEBGL_compressed_texture_etc' ),
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dxtSupported: renderer.extensions.has( 'WEBGL_compressed_texture_s3tc' ),
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bptcSupported: renderer.extensions.has( 'EXT_texture_compression_bptc' ),
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pvrtcSupported: renderer.extensions.has( 'WEBGL_compressed_texture_pvrtc' )
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|| renderer.extensions.has( 'WEBKIT_WEBGL_compressed_texture_pvrtc' )
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};
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if ( renderer.capabilities.isWebGL2 ) {
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// https://github.com/mrdoob/three.js/pull/22928
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this.workerConfig.etc1Supported = false;
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}
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return this;
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}
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init() {
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if ( ! this.transcoderPending ) {
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// Load transcoder wrapper.
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const jsLoader = new FileLoader( this.manager );
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jsLoader.setPath( this.transcoderPath );
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jsLoader.setWithCredentials( this.withCredentials );
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const jsContent = jsLoader.loadAsync( 'basis_transcoder.js' );
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// Load transcoder WASM binary.
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const binaryLoader = new FileLoader( this.manager );
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binaryLoader.setPath( this.transcoderPath );
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binaryLoader.setResponseType( 'arraybuffer' );
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binaryLoader.setWithCredentials( this.withCredentials );
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const binaryContent = binaryLoader.loadAsync( 'basis_transcoder.wasm' );
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this.transcoderPending = Promise.all( [ jsContent, binaryContent ] )
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.then( ( [ jsContent, binaryContent ] ) => {
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const fn = KTX2Loader.BasisWorker.toString();
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const body = [
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'/* constants */',
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'let _EngineFormat = ' + JSON.stringify( KTX2Loader.EngineFormat ),
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'let _TranscoderFormat = ' + JSON.stringify( KTX2Loader.TranscoderFormat ),
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'let _BasisFormat = ' + JSON.stringify( KTX2Loader.BasisFormat ),
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'/* basis_transcoder.js */',
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jsContent,
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'/* worker */',
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fn.substring( fn.indexOf( '{' ) + 1, fn.lastIndexOf( '}' ) )
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].join( '\n' );
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this.workerSourceURL = URL.createObjectURL( new Blob( [ body ] ) );
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this.transcoderBinary = binaryContent;
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this.workerPool.setWorkerCreator( () => {
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const worker = new Worker( this.workerSourceURL );
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const transcoderBinary = this.transcoderBinary.slice( 0 );
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worker.postMessage( { type: 'init', config: this.workerConfig, transcoderBinary }, [ transcoderBinary ] );
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return worker;
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} );
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} );
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if ( _activeLoaders > 0 ) {
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// Each instance loads a transcoder and allocates workers, increasing network and memory cost.
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console.warn(
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'THREE.KTX2Loader: Multiple active KTX2 loaders may cause performance issues.'
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+ ' Use a single KTX2Loader instance, or call .dispose() on old instances.'
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);
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}
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_activeLoaders ++;
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}
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return this.transcoderPending;
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}
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load( url, onLoad, onProgress, onError ) {
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if ( this.workerConfig === null ) {
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throw new Error( 'THREE.KTX2Loader: Missing initialization with `.detectSupport( renderer )`.' );
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}
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const loader = new FileLoader( this.manager );
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loader.setResponseType( 'arraybuffer' );
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loader.setWithCredentials( this.withCredentials );
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const texture = new CompressedTexture();
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loader.load( url, ( buffer ) => {
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// Check for an existing task using this buffer. A transferred buffer cannot be transferred
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// again from this thread.
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if ( _taskCache.has( buffer ) ) {
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const cachedTask = _taskCache.get( buffer );
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return cachedTask.promise.then( onLoad ).catch( onError );
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}
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this._createTexture( [ buffer ] )
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.then( function ( _texture ) {
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texture.copy( _texture );
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texture.needsUpdate = true;
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if ( onLoad ) onLoad( texture );
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} )
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.catch( onError );
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}, onProgress, onError );
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return texture;
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}
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_createTextureFrom( transcodeResult ) {
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const { mipmaps, width, height, format, type, error, dfdTransferFn, dfdFlags } = transcodeResult;
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if ( type === 'error' ) return Promise.reject( error );
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const texture = new CompressedTexture( mipmaps, width, height, format, UnsignedByteType );
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texture.minFilter = mipmaps.length === 1 ? LinearFilter : LinearMipmapLinearFilter;
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texture.magFilter = LinearFilter;
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texture.generateMipmaps = false;
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texture.needsUpdate = true;
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texture.encoding = dfdTransferFn === KTX2TransferSRGB ? sRGBEncoding : LinearEncoding;
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texture.premultiplyAlpha = !! ( dfdFlags & KTX2_ALPHA_PREMULTIPLIED );
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return texture;
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}
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/**
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* @param {ArrayBuffer[]} buffers
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* @param {object?} config
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* @return {Promise<CompressedTexture>}
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*/
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_createTexture( buffers, config = {} ) {
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const taskConfig = config;
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const texturePending = this.init().then( () => {
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return this.workerPool.postMessage( { type: 'transcode', buffers, taskConfig: taskConfig }, buffers );
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} ).then( ( e ) => this._createTextureFrom( e.data ) );
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// Cache the task result.
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_taskCache.set( buffers[ 0 ], { promise: texturePending } );
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return texturePending;
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}
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dispose() {
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this.workerPool.dispose();
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if ( this.workerSourceURL ) URL.revokeObjectURL( this.workerSourceURL );
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_activeLoaders --;
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return this;
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}
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}
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/* CONSTANTS */
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KTX2Loader.BasisFormat = {
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ETC1S: 0,
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UASTC_4x4: 1,
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};
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KTX2Loader.TranscoderFormat = {
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ETC1: 0,
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ETC2: 1,
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BC1: 2,
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BC3: 3,
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BC4: 4,
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BC5: 5,
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BC7_M6_OPAQUE_ONLY: 6,
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BC7_M5: 7,
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PVRTC1_4_RGB: 8,
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PVRTC1_4_RGBA: 9,
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ASTC_4x4: 10,
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ATC_RGB: 11,
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ATC_RGBA_INTERPOLATED_ALPHA: 12,
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RGBA32: 13,
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RGB565: 14,
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BGR565: 15,
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RGBA4444: 16,
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};
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KTX2Loader.EngineFormat = {
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RGBAFormat: RGBAFormat,
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RGBA_ASTC_4x4_Format: RGBA_ASTC_4x4_Format,
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RGBA_BPTC_Format: RGBA_BPTC_Format,
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RGBA_ETC2_EAC_Format: RGBA_ETC2_EAC_Format,
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RGBA_PVRTC_4BPPV1_Format: RGBA_PVRTC_4BPPV1_Format,
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RGBA_S3TC_DXT5_Format: RGBA_S3TC_DXT5_Format,
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RGB_ETC1_Format: RGB_ETC1_Format,
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RGB_ETC2_Format: RGB_ETC2_Format,
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RGB_PVRTC_4BPPV1_Format: RGB_PVRTC_4BPPV1_Format,
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RGB_S3TC_DXT1_Format: RGB_S3TC_DXT1_Format,
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};
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/* WEB WORKER */
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KTX2Loader.BasisWorker = function () {
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let config;
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let transcoderPending;
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let BasisModule;
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const EngineFormat = _EngineFormat; // eslint-disable-line no-undef
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const TranscoderFormat = _TranscoderFormat; // eslint-disable-line no-undef
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const BasisFormat = _BasisFormat; // eslint-disable-line no-undef
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self.addEventListener( 'message', function ( e ) {
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const message = e.data;
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switch ( message.type ) {
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case 'init':
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config = message.config;
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init( message.transcoderBinary );
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break;
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case 'transcode':
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transcoderPending.then( () => {
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try {
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const { width, height, hasAlpha, mipmaps, format, dfdTransferFn, dfdFlags } = transcode( message.buffers[ 0 ] );
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const buffers = [];
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for ( let i = 0; i < mipmaps.length; ++ i ) {
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buffers.push( mipmaps[ i ].data.buffer );
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}
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self.postMessage( { type: 'transcode', id: message.id, width, height, hasAlpha, mipmaps, format, dfdTransferFn, dfdFlags }, buffers );
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} catch ( error ) {
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console.error( error );
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self.postMessage( { type: 'error', id: message.id, error: error.message } );
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}
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} );
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break;
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}
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} );
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function init( wasmBinary ) {
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transcoderPending = new Promise( ( resolve ) => {
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BasisModule = { wasmBinary, onRuntimeInitialized: resolve };
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BASIS( BasisModule ); // eslint-disable-line no-undef
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} ).then( () => {
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BasisModule.initializeBasis();
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if ( BasisModule.KTX2File === undefined ) {
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console.warn( 'THREE.KTX2Loader: Please update Basis Universal transcoder.' );
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}
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} );
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}
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function transcode( buffer ) {
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const ktx2File = new BasisModule.KTX2File( new Uint8Array( buffer ) );
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function cleanup() {
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ktx2File.close();
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ktx2File.delete();
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}
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if ( ! ktx2File.isValid() ) {
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cleanup();
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throw new Error( 'THREE.KTX2Loader: Invalid or unsupported .ktx2 file' );
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}
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const basisFormat = ktx2File.isUASTC() ? BasisFormat.UASTC_4x4 : BasisFormat.ETC1S;
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const width = ktx2File.getWidth();
|
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const height = ktx2File.getHeight();
|
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const levels = ktx2File.getLevels();
|
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const hasAlpha = ktx2File.getHasAlpha();
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const dfdTransferFn = ktx2File.getDFDTransferFunc();
|
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const dfdFlags = ktx2File.getDFDFlags();
|
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const { transcoderFormat, engineFormat } = getTranscoderFormat( basisFormat, width, height, hasAlpha );
|
||||
|
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if ( ! width || ! height || ! levels ) {
|
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cleanup();
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throw new Error( 'THREE.KTX2Loader: Invalid texture' );
|
||||
|
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}
|
||||
|
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if ( ! ktx2File.startTranscoding() ) {
|
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|
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cleanup();
|
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throw new Error( 'THREE.KTX2Loader: .startTranscoding failed' );
|
||||
|
||||
}
|
||||
|
||||
const mipmaps = [];
|
||||
|
||||
for ( let mip = 0; mip < levels; mip ++ ) {
|
||||
|
||||
const levelInfo = ktx2File.getImageLevelInfo( mip, 0, 0 );
|
||||
const mipWidth = levelInfo.origWidth;
|
||||
const mipHeight = levelInfo.origHeight;
|
||||
const dst = new Uint8Array( ktx2File.getImageTranscodedSizeInBytes( mip, 0, 0, transcoderFormat ) );
|
||||
|
||||
const status = ktx2File.transcodeImage(
|
||||
dst,
|
||||
mip,
|
||||
0,
|
||||
0,
|
||||
transcoderFormat,
|
||||
0,
|
||||
- 1,
|
||||
- 1,
|
||||
);
|
||||
|
||||
if ( ! status ) {
|
||||
|
||||
cleanup();
|
||||
throw new Error( 'THREE.KTX2Loader: .transcodeImage failed.' );
|
||||
|
||||
}
|
||||
|
||||
mipmaps.push( { data: dst, width: mipWidth, height: mipHeight } );
|
||||
|
||||
}
|
||||
|
||||
cleanup();
|
||||
|
||||
return { width, height, hasAlpha, mipmaps, format: engineFormat, dfdTransferFn, dfdFlags };
|
||||
|
||||
}
|
||||
|
||||
//
|
||||
|
||||
// Optimal choice of a transcoder target format depends on the Basis format (ETC1S or UASTC),
|
||||
// device capabilities, and texture dimensions. The list below ranks the formats separately
|
||||
// for ETC1S and UASTC.
|
||||
//
|
||||
// In some cases, transcoding UASTC to RGBA32 might be preferred for higher quality (at
|
||||
// significant memory cost) compared to ETC1/2, BC1/3, and PVRTC. The transcoder currently
|
||||
// chooses RGBA32 only as a last resort and does not expose that option to the caller.
|
||||
const FORMAT_OPTIONS = [
|
||||
{
|
||||
if: 'astcSupported',
|
||||
basisFormat: [ BasisFormat.UASTC_4x4 ],
|
||||
transcoderFormat: [ TranscoderFormat.ASTC_4x4, TranscoderFormat.ASTC_4x4 ],
|
||||
engineFormat: [ EngineFormat.RGBA_ASTC_4x4_Format, EngineFormat.RGBA_ASTC_4x4_Format ],
|
||||
priorityETC1S: Infinity,
|
||||
priorityUASTC: 1,
|
||||
needsPowerOfTwo: false,
|
||||
},
|
||||
{
|
||||
if: 'bptcSupported',
|
||||
basisFormat: [ BasisFormat.ETC1S, BasisFormat.UASTC_4x4 ],
|
||||
transcoderFormat: [ TranscoderFormat.BC7_M5, TranscoderFormat.BC7_M5 ],
|
||||
engineFormat: [ EngineFormat.RGBA_BPTC_Format, EngineFormat.RGBA_BPTC_Format ],
|
||||
priorityETC1S: 3,
|
||||
priorityUASTC: 2,
|
||||
needsPowerOfTwo: false,
|
||||
},
|
||||
{
|
||||
if: 'dxtSupported',
|
||||
basisFormat: [ BasisFormat.ETC1S, BasisFormat.UASTC_4x4 ],
|
||||
transcoderFormat: [ TranscoderFormat.BC1, TranscoderFormat.BC3 ],
|
||||
engineFormat: [ EngineFormat.RGB_S3TC_DXT1_Format, EngineFormat.RGBA_S3TC_DXT5_Format ],
|
||||
priorityETC1S: 4,
|
||||
priorityUASTC: 5,
|
||||
needsPowerOfTwo: false,
|
||||
},
|
||||
{
|
||||
if: 'etc2Supported',
|
||||
basisFormat: [ BasisFormat.ETC1S, BasisFormat.UASTC_4x4 ],
|
||||
transcoderFormat: [ TranscoderFormat.ETC1, TranscoderFormat.ETC2 ],
|
||||
engineFormat: [ EngineFormat.RGB_ETC2_Format, EngineFormat.RGBA_ETC2_EAC_Format ],
|
||||
priorityETC1S: 1,
|
||||
priorityUASTC: 3,
|
||||
needsPowerOfTwo: false,
|
||||
},
|
||||
{
|
||||
if: 'etc1Supported',
|
||||
basisFormat: [ BasisFormat.ETC1S, BasisFormat.UASTC_4x4 ],
|
||||
transcoderFormat: [ TranscoderFormat.ETC1 ],
|
||||
engineFormat: [ EngineFormat.RGB_ETC1_Format ],
|
||||
priorityETC1S: 2,
|
||||
priorityUASTC: 4,
|
||||
needsPowerOfTwo: false,
|
||||
},
|
||||
{
|
||||
if: 'pvrtcSupported',
|
||||
basisFormat: [ BasisFormat.ETC1S, BasisFormat.UASTC_4x4 ],
|
||||
transcoderFormat: [ TranscoderFormat.PVRTC1_4_RGB, TranscoderFormat.PVRTC1_4_RGBA ],
|
||||
engineFormat: [ EngineFormat.RGB_PVRTC_4BPPV1_Format, EngineFormat.RGBA_PVRTC_4BPPV1_Format ],
|
||||
priorityETC1S: 5,
|
||||
priorityUASTC: 6,
|
||||
needsPowerOfTwo: true,
|
||||
},
|
||||
];
|
||||
|
||||
const ETC1S_OPTIONS = FORMAT_OPTIONS.sort( function ( a, b ) {
|
||||
|
||||
return a.priorityETC1S - b.priorityETC1S;
|
||||
|
||||
} );
|
||||
const UASTC_OPTIONS = FORMAT_OPTIONS.sort( function ( a, b ) {
|
||||
|
||||
return a.priorityUASTC - b.priorityUASTC;
|
||||
|
||||
} );
|
||||
|
||||
function getTranscoderFormat( basisFormat, width, height, hasAlpha ) {
|
||||
|
||||
let transcoderFormat;
|
||||
let engineFormat;
|
||||
|
||||
const options = basisFormat === BasisFormat.ETC1S ? ETC1S_OPTIONS : UASTC_OPTIONS;
|
||||
|
||||
for ( let i = 0; i < options.length; i ++ ) {
|
||||
|
||||
const opt = options[ i ];
|
||||
|
||||
if ( ! config[ opt.if ] ) continue;
|
||||
if ( ! opt.basisFormat.includes( basisFormat ) ) continue;
|
||||
if ( hasAlpha && opt.transcoderFormat.length < 2 ) continue;
|
||||
if ( opt.needsPowerOfTwo && ! ( isPowerOfTwo( width ) && isPowerOfTwo( height ) ) ) continue;
|
||||
|
||||
transcoderFormat = opt.transcoderFormat[ hasAlpha ? 1 : 0 ];
|
||||
engineFormat = opt.engineFormat[ hasAlpha ? 1 : 0 ];
|
||||
|
||||
return { transcoderFormat, engineFormat };
|
||||
|
||||
}
|
||||
|
||||
console.warn( 'THREE.KTX2Loader: No suitable compressed texture format found. Decoding to RGBA32.' );
|
||||
|
||||
transcoderFormat = TranscoderFormat.RGBA32;
|
||||
engineFormat = EngineFormat.RGBAFormat;
|
||||
|
||||
return { transcoderFormat, engineFormat };
|
||||
|
||||
}
|
||||
|
||||
function isPowerOfTwo( value ) {
|
||||
|
||||
if ( value <= 2 ) return true;
|
||||
|
||||
return ( value & ( value - 1 ) ) === 0 && value !== 0;
|
||||
|
||||
}
|
||||
|
||||
};
|
||||
|
||||
export { KTX2Loader };
|
||||
Reference in New Issue
Block a user