( function () {
/**
* 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 THREE.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 THREE.FileLoader( this.manager );
loader.setResponseType( 'arraybuffer' );
loader.setWithCredentials( this.withCredentials );
const texture = new THREE.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 THREE.CompressedTexture( mipmaps, width, height, format, THREE.UnsignedByteType );
texture.minFilter = mipmaps.length === 1 ? THREE.LinearFilter : THREE.LinearMipmapLinearFilter;
texture.magFilter = THREE.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 THREE.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 THREE.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: THREE.RGBAFormat,
RGBA_ASTC_4x4_Format: THREE.RGBA_ASTC_4x4_Format,
RGBA_BPTC_Format: THREE.RGBA_BPTC_Format,
RGBA_ETC2_EAC_Format: THREE.RGBA_ETC2_EAC_Format,
RGBA_PVRTC_4BPPV1_Format: THREE.RGBA_PVRTC_4BPPV1_Format,
RGBA_S3TC_DXT5_Format: THREE.RGBA_S3TC_DXT5_Format,
RGB_ETC1_Format: THREE.RGB_ETC1_Format,
RGB_ETC2_Format: THREE.RGB_ETC2_Format,
RGB_PVRTC_4BPPV1_Format: THREE.RGB_PVRTC_4BPPV1_Format,
RGB_S3TC_DXT1_Format: THREE.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;
}
};
THREE.BasisTextureLoader = BasisTextureLoader;
} )();
