mirror of
https://github.com/tengge1/ShadowEditor.git
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494 lines
11 KiB
JavaScript
494 lines
11 KiB
JavaScript
/**
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* @author Don McCurdy / https://www.donmccurdy.com
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* @author Austin Eng / https://github.com/austinEng
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* @author Shrek Shao / https://github.com/shrekshao
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*/
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/* global Module, createBasisModule */
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/**
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* Loader for Basis Universal GPU Texture Codec.
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*
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* Basis Universal is a "supercompressed" GPU texture and texture video
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* compression system that outputs a highly compressed intermediate file format
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* (.basis) that can be quickly transcoded to a wide variety of GPU texture
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* compression formats.
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*
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* This loader parallelizes the transcoding process across a configurable number
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* of web workers, before transferring the transcoded compressed texture back
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* to the main thread.
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*/
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THREE.BasisTextureLoader = function ( manager ) {
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this.manager = manager || THREE.DefaultLoadingManager;
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this.crossOrigin = 'anonymous';
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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.workerLimit = 4;
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this.workerPool = [];
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this.workerNextTaskID = 1;
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this.workerSourceURL = '';
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this.workerConfig = {
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format: null,
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etcSupported: false,
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dxtSupported: false,
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pvrtcSupported: false,
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};
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};
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THREE.BasisTextureLoader.prototype = {
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constructor: THREE.BasisTextureLoader,
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setCrossOrigin: function ( crossOrigin ) {
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this.crossOrigin = crossOrigin;
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return this;
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},
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setTranscoderPath: function ( path ) {
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this.transcoderPath = path;
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return this;
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},
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setWorkerLimit: function ( workerLimit ) {
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this.workerLimit = workerLimit;
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return this;
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},
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detectSupport: function ( renderer ) {
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var config = this.workerConfig;
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config.etcSupported = !! renderer.extensions.get( 'WEBGL_compressed_texture_etc1' );
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config.dxtSupported = !! renderer.extensions.get( 'WEBGL_compressed_texture_s3tc' );
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config.pvrtcSupported = !! renderer.extensions.get( 'WEBGL_compressed_texture_pvrtc' )
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|| !! renderer.extensions.get( 'WEBKIT_WEBGL_compressed_texture_pvrtc' );
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if ( config.etcSupported ) {
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config.format = THREE.BasisTextureLoader.BASIS_FORMAT.cTFETC1;
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} else if ( config.dxtSupported ) {
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config.format = THREE.BasisTextureLoader.BASIS_FORMAT.cTFBC1;
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} else if ( config.pvrtcSupported ) {
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config.format = THREE.BasisTextureLoader.BASIS_FORMAT.cTFPVRTC1_4_OPAQUE_ONLY;
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} else {
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throw new Error( 'THREE.BasisTextureLoader: No suitable compressed texture format found.' );
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}
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return this;
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},
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load: function ( url, onLoad, onProgress, onError ) {
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var loader = new THREE.FileLoader( this.manager );
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loader.setResponseType( 'arraybuffer' );
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loader.load( url, ( buffer ) => {
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this._createTexture( buffer )
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.then( onLoad )
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.catch( onError );
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}, onProgress, onError );
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},
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/**
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* @param {ArrayBuffer} buffer
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* @return {Promise<THREE.CompressedTexture>}
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*/
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_createTexture: function ( buffer ) {
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var worker;
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var taskID;
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var texturePending = this._getWorker()
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.then( ( _worker ) => {
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worker = _worker;
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taskID = this.workerNextTaskID ++;
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return new Promise( ( resolve, reject ) => {
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worker._callbacks[ taskID ] = { resolve, reject };
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worker._taskCosts[ taskID ] = buffer.byteLength;
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worker._taskLoad += worker._taskCosts[ taskID ];
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worker.postMessage( { type: 'transcode', id: taskID, buffer }, [ buffer ] );
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} );
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} )
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.then( ( message ) => {
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var config = this.workerConfig;
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var { width, height, mipmaps } = message;
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var texture;
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if ( config.etcSupported ) {
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texture = new THREE.CompressedTexture( mipmaps, width, height, THREE.RGB_ETC1_Format );
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} else if ( config.dxtSupported ) {
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texture = new THREE.CompressedTexture( mipmaps, width, height, THREE.BasisTextureLoader.DXT_FORMAT_MAP[ config.format ], THREE.UnsignedByteType );
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} else if ( config.pvrtcSupported ) {
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texture = new THREE.CompressedTexture( mipmaps, width, height, THREE.RGB_PVRTC_4BPPV1_Format );
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} else {
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throw new Error( 'THREE.BasisTextureLoader: No supported format available.' );
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}
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texture.minFilter = mipmaps.length === 1 ? THREE.LinearFilter : THREE.LinearMipmapLinearFilter;
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texture.magFilter = THREE.LinearFilter;
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texture.generateMipmaps = false;
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texture.needsUpdate = true;
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return texture;
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} );
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texturePending
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.finally( () => {
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if ( worker && taskID ) {
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worker._taskLoad -= worker._taskCosts[ taskID ];
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delete worker._callbacks[ taskID ];
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delete worker._taskCosts[ taskID ];
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}
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} );
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return texturePending;
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},
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_initTranscoder: function () {
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if ( ! this.transcoderBinary ) {
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// Load transcoder wrapper.
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var jsLoader = new THREE.FileLoader( this.manager );
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jsLoader.setPath( this.transcoderPath );
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var jsContent = new Promise( ( resolve, reject ) => {
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jsLoader.load( 'basis_transcoder.js', resolve, undefined, reject );
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} );
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// Load transcoder WASM binary.
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var binaryLoader = new THREE.FileLoader( this.manager );
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binaryLoader.setPath( this.transcoderPath );
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binaryLoader.setResponseType( 'arraybuffer' );
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var binaryContent = new Promise( ( resolve, reject ) => {
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binaryLoader.load( 'basis_transcoder.wasm', resolve, undefined, reject );
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} );
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this.transcoderPending = Promise.all( [ jsContent, binaryContent ] )
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.then( ( [ jsContent, binaryContent ] ) => {
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var fn = THREE.BasisTextureLoader.BasisWorker.toString();
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var body = [
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'/* basis_transcoder.js */',
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'var Module;',
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'function createBasisModule () {',
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' ' + jsContent,
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' return Module;',
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'}',
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'',
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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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} );
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}
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return this.transcoderPending;
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},
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_getWorker: function () {
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return this._initTranscoder().then( () => {
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if ( this.workerPool.length < this.workerLimit ) {
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var worker = new Worker( this.workerSourceURL );
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worker._callbacks = {};
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worker._taskCosts = {};
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worker._taskLoad = 0;
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worker.postMessage( {
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type: 'init',
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config: this.workerConfig,
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transcoderBinary: this.transcoderBinary,
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} );
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worker.onmessage = function ( e ) {
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var message = e.data;
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switch ( message.type ) {
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case 'transcode':
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worker._callbacks[ message.id ].resolve( message );
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break;
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case 'error':
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worker._callbacks[ message.id ].reject( message );
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break;
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default:
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console.error( 'THREE.BasisTextureLoader: Unexpected message, "' + message.type + '"' );
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}
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};
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this.workerPool.push( worker );
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} else {
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this.workerPool.sort( function ( a, b ) {
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return a._taskLoad > b._taskLoad ? - 1 : 1;
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} );
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}
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return this.workerPool[ this.workerPool.length - 1 ];
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} );
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},
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dispose: function () {
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for ( var i = 0; i < this.workerPool.length; i ++ ) {
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this.workerPool[ i ].terminate();
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}
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this.workerPool.length = 0;
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return this;
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}
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};
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/* CONSTANTS */
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THREE.BasisTextureLoader.BASIS_FORMAT = {
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cTFETC1: 0,
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cTFBC1: 1,
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cTFBC4: 2,
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cTFPVRTC1_4_OPAQUE_ONLY: 3,
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cTFBC7_M6_OPAQUE_ONLY: 4,
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cTFETC2: 5,
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cTFBC3: 6,
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cTFBC5: 7,
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};
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// DXT formats, from:
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// http://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_s3tc/
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THREE.BasisTextureLoader.DXT_FORMAT = {
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COMPRESSED_RGB_S3TC_DXT1_EXT: 0x83F0,
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COMPRESSED_RGBA_S3TC_DXT1_EXT: 0x83F1,
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COMPRESSED_RGBA_S3TC_DXT3_EXT: 0x83F2,
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COMPRESSED_RGBA_S3TC_DXT5_EXT: 0x83F3,
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};
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THREE.BasisTextureLoader.DXT_FORMAT_MAP = {};
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THREE.BasisTextureLoader.DXT_FORMAT_MAP[ THREE.BasisTextureLoader.BASIS_FORMAT.cTFBC1 ] =
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THREE.BasisTextureLoader.DXT_FORMAT.COMPRESSED_RGB_S3TC_DXT1_EXT;
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THREE.BasisTextureLoader.DXT_FORMAT_MAP[ THREE.BasisTextureLoader.BASIS_FORMAT.cTFBC3 ] =
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THREE.BasisTextureLoader.DXT_FORMAT.COMPRESSED_RGBA_S3TC_DXT5_EXT;
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/* WEB WORKER */
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THREE.BasisTextureLoader.BasisWorker = function () {
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var config;
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var transcoderPending;
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var _BasisFile;
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onmessage = function ( e ) {
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var 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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var { width, height, mipmaps } = transcode( message.buffer );
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var buffers = [];
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for ( var 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, mipmaps }, 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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// The 'Module' global is used by the Basis wrapper, which will check for
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// the 'wasmBinary' property before trying to load the file itself.
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// TODO(donmccurdy): This only works with a modified version of the
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// emscripten-generated wrapper. The default seems to have a bug making it
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// impossible to override the WASM binary.
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Module = { wasmBinary, onRuntimeInitialized: resolve };
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} ).then( () => {
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var { BasisFile, initializeBasis } = Module;
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_BasisFile = BasisFile;
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initializeBasis();
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} );
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createBasisModule();
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}
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function transcode( buffer ) {
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var basisFile = new _BasisFile( new Uint8Array( buffer ) );
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var width = basisFile.getImageWidth( 0, 0 );
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var height = basisFile.getImageHeight( 0, 0 );
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var levels = basisFile.getNumLevels( 0 );
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function cleanup() {
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basisFile.close();
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basisFile.delete();
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}
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if ( ! width || ! height || ! levels ) {
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cleanup();
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throw new Error( 'THREE.BasisTextureLoader: Invalid .basis file' );
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}
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if ( ! basisFile.startTranscoding() ) {
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cleanup();
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throw new Error( 'THREE.BasisTextureLoader: .startTranscoding failed' );
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}
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if ( basisFile.getHasAlpha() ) {
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console.warn( 'THREE.BasisTextureLoader: Alpha not yet implemented.' );
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}
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var mipmaps = [];
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for ( var mip = 0; mip < levels; mip ++ ) {
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var mipWidth = basisFile.getImageWidth( 0, mip );
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var mipHeight = basisFile.getImageHeight( 0, mip );
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var dst = new Uint8Array( basisFile.getImageTranscodedSizeInBytes( 0, mip, config.format ) );
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var status = basisFile.transcodeImage(
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dst,
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0,
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mip,
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config.format,
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config.etcSupported ? 0 : ( config.dxtSupported ? 1 : 0 ),
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0
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);
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if ( ! status ) {
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cleanup();
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throw new Error( 'THREE.BasisTextureLoader: .transcodeImage failed.' );
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}
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mipmaps.push( { data: dst, width: mipWidth, height: mipHeight } );
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}
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cleanup();
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return { width, height, mipmaps };
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}
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};
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