Remove BasisTextureLoader (#25392)

docs/examples/en/loaders/KTX2Loader.html

@@ -81,7 +81,7 @@
 
 		<h3>[method:CompressedTexture load]( [param:String url], [param:Function onLoad], [param:Function onProgress], [param:Function onError] )</h3>
 		<p>
-		[page:String url] — A string containing the path/URL of the `.basis` file.<br />
+		[page:String url] — A string containing the path/URL of the `.ktx2` file.<br />
 		[page:Function onLoad] — A function to be called after the loading is successfully completed.<br />
 		[page:Function onProgress] — (optional) A function to be called while the loading is in progress. The argument will be the XMLHttpRequest instance, that contains .[page:Integer total] and .[page:Integer loaded] bytes. If the server does not set the Content-Length header; .[page:Integer total] will be 0.<br />
 		[page:Function onError] — (optional) A function to be called if an error occurs during loading. The function receives error as an argument.<br />

examples/jsm/loaders/BasisTextureLoader.js

@@ -1,790 +0,0 @@
-import {
-	CompressedTexture,
-	FileLoader,
-	LinearFilter,
-	LinearMipmapLinearFilter,
-	Loader,
-	RGBAFormat,
-	RGBA_ASTC_4x4_Format,
-	RGBA_BPTC_Format,
-	RGBA_ETC2_EAC_Format,
-	RGBA_PVRTC_4BPPV1_Format,
-	RGBA_S3TC_DXT5_Format,
-	RGB_ETC1_Format,
-	RGB_ETC2_Format,
-	RGB_PVRTC_4BPPV1_Format,
-	RGB_S3TC_DXT1_Format,
-	UnsignedByteType
-} from 'three';
-
-/**
- * Loader for Basis Universal GPU Texture Codec.
- *
- * Basis Universal is a "supercompressed" GPU texture and texture video
- * compression system that outputs a highly compressed intermediate file format
- * (.basis) that can be quickly transcoded to a wide variety of GPU texture
- * compression formats.
- *
- * This loader parallelizes the transcoding process across a configurable number
- * of web workers, before transferring the transcoded compressed texture back
- * to the main thread.
- */
-
-const _taskCache = new WeakMap();
-
-class BasisTextureLoader extends Loader {
-
-	constructor( manager ) {
-
-		super( manager );
-
-		this.transcoderPath = '';
-		this.transcoderBinary = null;
-		this.transcoderPending = null;
-
-		this.workerLimit = 4;
-		this.workerPool = [];
-		this.workerNextTaskID = 1;
-		this.workerSourceURL = '';
-		this.workerConfig = null;
-
-		console.warn(
-
-			'THREE.BasisTextureLoader: This loader is deprecated, and will be removed in a future release. '
-			+ 'Instead, use Basis Universal compression in KTX2 (.ktx2) files with THREE.KTX2Loader.'
-
-		);
-
-	}
-
-	setTranscoderPath( path ) {
-
-		this.transcoderPath = path;
-
-		return this;
-
-	}
-
-	setWorkerLimit( workerLimit ) {
-
-		this.workerLimit = workerLimit;
-
-		return this;
-
-	}
-
-	detectSupport( renderer ) {
-
-		this.workerConfig = {
-			astcSupported: renderer.extensions.has( 'WEBGL_compressed_texture_astc' ),
-			etc1Supported: renderer.extensions.has( 'WEBGL_compressed_texture_etc1' ),
-			etc2Supported: renderer.extensions.has( 'WEBGL_compressed_texture_etc' ),
-			dxtSupported: renderer.extensions.has( 'WEBGL_compressed_texture_s3tc' ),
-			bptcSupported: renderer.extensions.has( 'EXT_texture_compression_bptc' ),
-			pvrtcSupported: renderer.extensions.has( 'WEBGL_compressed_texture_pvrtc' )
-				|| renderer.extensions.has( 'WEBKIT_WEBGL_compressed_texture_pvrtc' )
-		};
-
-		return this;
-
-	}
-
-	load( url, onLoad, onProgress, onError ) {
-
-		const loader = new FileLoader( this.manager );
-
-		loader.setResponseType( 'arraybuffer' );
-		loader.setWithCredentials( this.withCredentials );
-
-		const texture = new CompressedTexture();
-
-		loader.load( url, ( buffer ) => {
-
-			// Check for an existing task using this buffer. A transferred buffer cannot be transferred
-			// again from this thread.
-			if ( _taskCache.has( buffer ) ) {
-
-				const cachedTask = _taskCache.get( buffer );
-
-				return cachedTask.promise.then( onLoad ).catch( onError );
-
-			}
-
-			this._createTexture( [ buffer ] )
-				.then( function ( _texture ) {
-
-					texture.copy( _texture );
-					texture.needsUpdate = true;
-
-					if ( onLoad ) onLoad( texture );
-
-				} )
-				.catch( onError );
-
-		}, onProgress, onError );
-
-		return texture;
-
-	}
-
-	/** Low-level transcoding API, exposed for use by KTX2Loader. */
-	parseInternalAsync( options ) {
-
-		const { levels } = options;
-
-		const buffers = new Set();
-
-		for ( let i = 0; i < levels.length; i ++ ) {
-
-			buffers.add( levels[ i ].data.buffer );
-
-		}
-
-		return this._createTexture( Array.from( buffers ), { ...options, lowLevel: true } );
-
-	}
-
-	/**
-	 * @param {ArrayBuffer[]} buffers
-	 * @param {object?} config
-	 * @return {Promise<CompressedTexture>}
-	 */
-	_createTexture( buffers, config = {} ) {
-
-		let worker;
-		let taskID;
-
-		const taskConfig = config;
-		let taskCost = 0;
-
-		for ( let i = 0; i < buffers.length; i ++ ) {
-
-			taskCost += buffers[ i ].byteLength;
-
-		}
-
-		const texturePending = this._allocateWorker( taskCost )
-			.then( ( _worker ) => {
-
-				worker = _worker;
-				taskID = this.workerNextTaskID ++;
-
-				return new Promise( ( resolve, reject ) => {
-
-					worker._callbacks[ taskID ] = { resolve, reject };
-
-					worker.postMessage( { type: 'transcode', id: taskID, buffers: buffers, taskConfig: taskConfig }, buffers );
-
-				} );
-
-			} )
-			.then( ( message ) => {
-
-				const { mipmaps, width, height, format } = message;
-
-				const texture = new CompressedTexture( mipmaps, width, height, format, UnsignedByteType );
-				texture.minFilter = mipmaps.length === 1 ? LinearFilter : LinearMipmapLinearFilter;
-				texture.magFilter = LinearFilter;
-				texture.generateMipmaps = false;
-				texture.needsUpdate = true;
-
-				return texture;
-
-			} );
-
-		// Note: replaced '.finally()' with '.catch().then()' block - iOS 11 support (#19416)
-		texturePending
-			.catch( () => true )
-			.then( () => {
-
-				if ( worker && taskID ) {
-
-					worker._taskLoad -= taskCost;
-					delete worker._callbacks[ taskID ];
-
-				}
-
-			} );
-
-		// Cache the task result.
-		_taskCache.set( buffers[ 0 ], { promise: texturePending } );
-
-		return texturePending;
-
-	}
-
-	_initTranscoder() {
-
-		if ( ! this.transcoderPending ) {
-
-			// Load transcoder wrapper.
-			const jsLoader = new FileLoader( this.manager );
-			jsLoader.setPath( this.transcoderPath );
-			jsLoader.setWithCredentials( this.withCredentials );
-			const jsContent = new Promise( ( resolve, reject ) => {
-
-				jsLoader.load( 'basis_transcoder.js', resolve, undefined, reject );
-
-			} );
-
-			// Load transcoder WASM binary.
-			const binaryLoader = new FileLoader( this.manager );
-			binaryLoader.setPath( this.transcoderPath );
-			binaryLoader.setResponseType( 'arraybuffer' );
-			binaryLoader.setWithCredentials( this.withCredentials );
-			const binaryContent = new Promise( ( resolve, reject ) => {
-
-				binaryLoader.load( 'basis_transcoder.wasm', resolve, undefined, reject );
-
-			} );
-
-			this.transcoderPending = Promise.all( [ jsContent, binaryContent ] )
-				.then( ( [ jsContent, binaryContent ] ) => {
-
-					const fn = BasisTextureLoader.BasisWorker.toString();
-
-					const body = [
-						'/* constants */',
-						'let _EngineFormat = ' + JSON.stringify( BasisTextureLoader.EngineFormat ),
-						'let _TranscoderFormat = ' + JSON.stringify( BasisTextureLoader.TranscoderFormat ),
-						'let _BasisFormat = ' + JSON.stringify( BasisTextureLoader.BasisFormat ),
-						'/* basis_transcoder.js */',
-						jsContent,
-						'/* worker */',
-						fn.substring( fn.indexOf( '{' ) + 1, fn.lastIndexOf( '}' ) )
-					].join( '\n' );
-
-					this.workerSourceURL = URL.createObjectURL( new Blob( [ body ] ) );
-					this.transcoderBinary = binaryContent;
-
-				} );
-
-		}
-
-		return this.transcoderPending;
-
-	}
-
-	_allocateWorker( taskCost ) {
-
-		return this._initTranscoder().then( () => {
-
-			if ( this.workerPool.length < this.workerLimit ) {
-
-				const worker = new Worker( this.workerSourceURL );
-
-				worker._callbacks = {};
-				worker._taskLoad = 0;
-
-				worker.postMessage( {
-					type: 'init',
-					config: this.workerConfig,
-					transcoderBinary: this.transcoderBinary,
-				} );
-
-				worker.onmessage = function ( e ) {
-
-					const message = e.data;
-
-					switch ( message.type ) {
-
-						case 'transcode':
-							worker._callbacks[ message.id ].resolve( message );
-							break;
-
-						case 'error':
-							worker._callbacks[ message.id ].reject( message );
-							break;
-
-						default:
-							console.error( 'THREE.BasisTextureLoader: Unexpected message, "' + message.type + '"' );
-
-					}
-
-				};
-
-				this.workerPool.push( worker );
-
-			} else {
-
-				this.workerPool.sort( function ( a, b ) {
-
-					return a._taskLoad > b._taskLoad ? - 1 : 1;
-
-				} );
-
-			}
-
-			const worker = this.workerPool[ this.workerPool.length - 1 ];
-
-			worker._taskLoad += taskCost;
-
-			return worker;
-
-		} );
-
-	}
-
-	dispose() {
-
-		for ( let i = 0; i < this.workerPool.length; i ++ ) {
-
-			this.workerPool[ i ].terminate();
-
-		}
-
-		this.workerPool.length = 0;
-
-		return this;
-
-	}
-
-}
-
-/* CONSTANTS */
-
-BasisTextureLoader.BasisFormat = {
-	ETC1S: 0,
-	UASTC_4x4: 1,
-};
-
-BasisTextureLoader.TranscoderFormat = {
-	ETC1: 0,
-	ETC2: 1,
-	BC1: 2,
-	BC3: 3,
-	BC4: 4,
-	BC5: 5,
-	BC7_M6_OPAQUE_ONLY: 6,
-	BC7_M5: 7,
-	PVRTC1_4_RGB: 8,
-	PVRTC1_4_RGBA: 9,
-	ASTC_4x4: 10,
-	ATC_RGB: 11,
-	ATC_RGBA_INTERPOLATED_ALPHA: 12,
-	RGBA32: 13,
-	RGB565: 14,
-	BGR565: 15,
-	RGBA4444: 16,
-};
-
-BasisTextureLoader.EngineFormat = {
-	RGBAFormat: RGBAFormat,
-	RGBA_ASTC_4x4_Format: RGBA_ASTC_4x4_Format,
-	RGBA_BPTC_Format: RGBA_BPTC_Format,
-	RGBA_ETC2_EAC_Format: RGBA_ETC2_EAC_Format,
-	RGBA_PVRTC_4BPPV1_Format: RGBA_PVRTC_4BPPV1_Format,
-	RGBA_S3TC_DXT5_Format: RGBA_S3TC_DXT5_Format,
-	RGB_ETC1_Format: RGB_ETC1_Format,
-	RGB_ETC2_Format: RGB_ETC2_Format,
-	RGB_PVRTC_4BPPV1_Format: RGB_PVRTC_4BPPV1_Format,
-	RGB_S3TC_DXT1_Format: RGB_S3TC_DXT1_Format,
-};
-
-
-/* WEB WORKER */
-
-BasisTextureLoader.BasisWorker = function () {
-
-	let config;
-	let transcoderPending;
-	let BasisModule;
-
-	const EngineFormat = _EngineFormat; // eslint-disable-line no-undef
-	const TranscoderFormat = _TranscoderFormat; // eslint-disable-line no-undef
-	const BasisFormat = _BasisFormat; // eslint-disable-line no-undef
-
-	onmessage = function ( e ) {
-
-		const message = e.data;
-
-		switch ( message.type ) {
-
-			case 'init':
-				config = message.config;
-				init( message.transcoderBinary );
-				break;
-
-			case 'transcode':
-				transcoderPending.then( () => {
-
-					try {
-
-						const { width, height, hasAlpha, mipmaps, format } = message.taskConfig.lowLevel
-							? transcodeLowLevel( message.taskConfig )
-							: transcode( message.buffers[ 0 ] );
-
-						const buffers = [];
-
-						for ( let i = 0; i < mipmaps.length; ++ i ) {
-
-							buffers.push( mipmaps[ i ].data.buffer );
-
-						}
-
-						self.postMessage( { type: 'transcode', id: message.id, width, height, hasAlpha, mipmaps, format }, buffers );
-
-					} catch ( error ) {
-
-						console.error( error );
-
-						self.postMessage( { type: 'error', id: message.id, error: error.message } );
-
-					}
-
-				} );
-				break;
-
-		}
-
-	};
-
-	function init( wasmBinary ) {
-
-		transcoderPending = new Promise( ( resolve ) => {
-
-			BasisModule = { wasmBinary, onRuntimeInitialized: resolve };
-			BASIS( BasisModule ); // eslint-disable-line no-undef
-
-		} ).then( () => {
-
-			BasisModule.initializeBasis();
-
-		} );
-
-	}
-
-	function transcodeLowLevel( taskConfig ) {
-
-		const { basisFormat, width, height, hasAlpha } = taskConfig;
-
-		const { transcoderFormat, engineFormat } = getTranscoderFormat( basisFormat, width, height, hasAlpha );
-
-		const blockByteLength = BasisModule.getBytesPerBlockOrPixel( transcoderFormat );
-
-		assert( BasisModule.isFormatSupported( transcoderFormat ), 'THREE.BasisTextureLoader: Unsupported format.' );
-
-		const mipmaps = [];
-
-		if ( basisFormat === BasisFormat.ETC1S ) {
-
-			const transcoder = new BasisModule.LowLevelETC1SImageTranscoder();
-
-			const { endpointCount, endpointsData, selectorCount, selectorsData, tablesData } = taskConfig.globalData;
-
-			try {
-
-				let ok;
-
-				ok = transcoder.decodePalettes( endpointCount, endpointsData, selectorCount, selectorsData );
-
-				assert( ok, 'THREE.BasisTextureLoader: decodePalettes() failed.' );
-
-				ok = transcoder.decodeTables( tablesData );
-
-				assert( ok, 'THREE.BasisTextureLoader: decodeTables() failed.' );
-
-				for ( let i = 0; i < taskConfig.levels.length; i ++ ) {
-
-					const level = taskConfig.levels[ i ];
-					const imageDesc = taskConfig.globalData.imageDescs[ i ];
-
-					const dstByteLength = getTranscodedImageByteLength( transcoderFormat, level.width, level.height );
-					const dst = new Uint8Array( dstByteLength );
-
-					ok = transcoder.transcodeImage(
-						transcoderFormat,
-						dst, dstByteLength / blockByteLength,
-						level.data,
-						getWidthInBlocks( transcoderFormat, level.width ),
-						getHeightInBlocks( transcoderFormat, level.height ),
-						level.width, level.height, level.index,
-						imageDesc.rgbSliceByteOffset, imageDesc.rgbSliceByteLength,
-						imageDesc.alphaSliceByteOffset, imageDesc.alphaSliceByteLength,
-						imageDesc.imageFlags,
-						hasAlpha,
-						false,
-						0, 0
-					);
-
-					assert( ok, 'THREE.BasisTextureLoader: transcodeImage() failed for level ' + level.index + '.' );
-
-					mipmaps.push( { data: dst, width: level.width, height: level.height } );
-
-				}
-
-			} finally {
-
-				transcoder.delete();
-
-			}
-
-		} else {
-
-			for ( let i = 0; i < taskConfig.levels.length; i ++ ) {
-
-				const level = taskConfig.levels[ i ];
-
-				const dstByteLength = getTranscodedImageByteLength( transcoderFormat, level.width, level.height );
-				const dst = new Uint8Array( dstByteLength );
-
-				const ok = BasisModule.transcodeUASTCImage(
-					transcoderFormat,
-					dst, dstByteLength / blockByteLength,
-					level.data,
-					getWidthInBlocks( transcoderFormat, level.width ),
-					getHeightInBlocks( transcoderFormat, level.height ),
-					level.width, level.height, level.index,
-					0,
-					level.data.byteLength,
-					0,
-					hasAlpha,
-					false,
-					0, 0,
-					- 1, - 1
-				);
-
-				assert( ok, 'THREE.BasisTextureLoader: transcodeUASTCImage() failed for level ' + level.index + '.' );
-
-				mipmaps.push( { data: dst, width: level.width, height: level.height } );
-
-			}
-
-		}
-
-		return { width, height, hasAlpha, mipmaps, format: engineFormat };
-
-	}
-
-	function transcode( buffer ) {
-
-		const basisFile = new BasisModule.BasisFile( new Uint8Array( buffer ) );
-
-		const basisFormat = basisFile.isUASTC() ? BasisFormat.UASTC_4x4 : BasisFormat.ETC1S;
-		const width = basisFile.getImageWidth( 0, 0 );
-		const height = basisFile.getImageHeight( 0, 0 );
-		const levels = basisFile.getNumLevels( 0 );
-		const hasAlpha = basisFile.getHasAlpha();
-
-		function cleanup() {
-
-			basisFile.close();
-			basisFile.delete();
-
-		}
-
-		const { transcoderFormat, engineFormat } = getTranscoderFormat( basisFormat, width, height, hasAlpha );
-
-		if ( ! width || ! height || ! levels ) {
-
-			cleanup();
-			throw new Error( 'THREE.BasisTextureLoader:	Invalid texture' );
-
-		}
-
-		if ( ! basisFile.startTranscoding() ) {
-
-			cleanup();
-			throw new Error( 'THREE.BasisTextureLoader: .startTranscoding failed' );
-
-		}
-
-		const mipmaps = [];
-
-		for ( let mip = 0; mip < levels; mip ++ ) {
-
-			const mipWidth = basisFile.getImageWidth( 0, mip );
-			const mipHeight = basisFile.getImageHeight( 0, mip );
-			const dst = new Uint8Array( basisFile.getImageTranscodedSizeInBytes( 0, mip, transcoderFormat ) );
-
-			const status = basisFile.transcodeImage(
-				dst,
-				0,
-				mip,
-				transcoderFormat,
-				0,
-				hasAlpha
-			);
-
-			if ( ! status ) {
-
-				cleanup();
-				throw new Error( 'THREE.BasisTextureLoader: .transcodeImage failed.' );
-
-			}
-
-			mipmaps.push( { data: dst, width: mipWidth, height: mipHeight } );
-
-		}
-
-		cleanup();
-
-		return { width, height, hasAlpha, mipmaps, format: engineFormat };
-
-	}
-
-	//
-
-	// 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, TranscoderFormat.ETC1 ],
-			engineFormat: [ EngineFormat.RGB_ETC1_Format, 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 ( 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.BasisTextureLoader: No suitable compressed texture format found. Decoding to RGBA32.' );
-
-		transcoderFormat = TranscoderFormat.RGBA32;
-		engineFormat = EngineFormat.RGBAFormat;
-
-		return { transcoderFormat, engineFormat };
-
-	}
-
-	function assert( ok, message ) {
-
-		if ( ! ok ) throw new Error( message );
-
-	}
-
-	function getWidthInBlocks( transcoderFormat, width ) {
-
-		return Math.ceil( width / BasisModule.getFormatBlockWidth( transcoderFormat ) );
-
-	}
-
-	function getHeightInBlocks( transcoderFormat, height ) {
-
-		return Math.ceil( height / BasisModule.getFormatBlockHeight( transcoderFormat ) );
-
-	}
-
-	function getTranscodedImageByteLength( transcoderFormat, width, height ) {
-
-		const blockByteLength = BasisModule.getBytesPerBlockOrPixel( transcoderFormat );
-
-		if ( BasisModule.formatIsUncompressed( transcoderFormat ) ) {
-
-			return width * height * blockByteLength;
-
-		}
-
-		if ( transcoderFormat === TranscoderFormat.PVRTC1_4_RGB
-				|| transcoderFormat === TranscoderFormat.PVRTC1_4_RGBA ) {
-
-			// GL requires extra padding for very small textures:
-			// https://www.khronos.org/registry/OpenGL/extensions/IMG/IMG_texture_compression_pvrtc.txt
-			const paddedWidth = ( width + 3 ) & ~ 3;
-			const paddedHeight = ( height + 3 ) & ~ 3;
-
-			return ( Math.max( 8, paddedWidth ) * Math.max( 8, paddedHeight ) * 4 + 7 ) / 8;
-
-		}
-
-		return ( getWidthInBlocks( transcoderFormat, width )
-			* getHeightInBlocks( transcoderFormat, height )
-			* blockByteLength );
-
-	}
-
-	function isPowerOfTwo( value ) {
-
-		if ( value <= 2 ) return true;
-
-		return ( value & ( value - 1 ) ) === 0 && value !== 0;
-
-	}
-
-};
-
-export { BasisTextureLoader };