( function () {
const _taskCache = new WeakMap();
class DRACOLoader extends THREE.Loader {
constructor( manager ) {
super( manager );
this.decoderPath = '';
this.decoderConfig = {};
this.decoderBinary = null;
this.decoderPending = null;
this.workerLimit = 4;
this.workerPool = [];
this.workerNextTaskID = 1;
this.workerSourceURL = '';
this.defaultAttributeIDs = {
position: 'POSITION',
normal: 'NORMAL',
color: 'COLOR',
uv: 'TEX_COORD'
};
this.defaultAttributeTypes = {
position: 'Float32Array',
normal: 'Float32Array',
color: 'Float32Array',
uv: 'Float32Array'
};
}
setDecoderPath( path ) {
this.decoderPath = path;
return this;
}
setDecoderConfig( config ) {
this.decoderConfig = config;
return this;
}
setWorkerLimit( workerLimit ) {
this.workerLimit = workerLimit;
return this;
}
load( url, onLoad, onProgress, onError ) {
const loader = new THREE.FileLoader( this.manager );
loader.setPath( this.path );
loader.setResponseType( 'arraybuffer' );
loader.setRequestHeader( this.requestHeader );
loader.setWithCredentials( this.withCredentials );
loader.load( url, buffer => {
this.decodeDracoFile( buffer, onLoad ).catch( onError );
}, onProgress, onError );
}
decodeDracoFile( buffer, callback, attributeIDs, attributeTypes ) {
const taskConfig = {
attributeIDs: attributeIDs || this.defaultAttributeIDs,
attributeTypes: attributeTypes || this.defaultAttributeTypes,
useUniqueIDs: !! attributeIDs
};
return this.decodeGeometry( buffer, taskConfig ).then( callback );
}
decodeGeometry( buffer, taskConfig ) {
const taskKey = JSON.stringify( taskConfig ); // 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 );
if ( cachedTask.key === taskKey ) {
return cachedTask.promise;
} else if ( buffer.byteLength === 0 ) {
// Technically, it would be possible to wait for the previous task to complete,
// transfer the buffer back, and decode again with the second configuration. That
// is complex, and I don't know of any reason to decode a Draco buffer twice in
// different ways, so this is left unimplemented.
throw new Error( 'THREE.DRACOLoader: Unable to re-decode a buffer with different ' + 'settings. Buffer has already been transferred.' );
}
} //
let worker;
const taskID = this.workerNextTaskID ++;
const taskCost = buffer.byteLength; // Obtain a worker and assign a task, and construct a geometry instance
// when the task completes.
const geometryPending = this._getWorker( taskID, taskCost ).then( _worker => {
worker = _worker;
return new Promise( ( resolve, reject ) => {
worker._callbacks[ taskID ] = {
resolve,
reject
};
worker.postMessage( {
type: 'decode',
id: taskID,
taskConfig,
buffer
}, [ buffer ] ); // this.debug();
} );
} ).then( message => this._createGeometry( message.geometry ) ); // Remove task from the task list.
// Note: replaced '.finally()' with '.catch().then()' block - iOS 11 support (#19416)
geometryPending.catch( () => true ).then( () => {
if ( worker && taskID ) {
this._releaseTask( worker, taskID ); // this.debug();
}
} ); // Cache the task result.
_taskCache.set( buffer, {
key: taskKey,
promise: geometryPending
} );
return geometryPending;
}
_createGeometry( geometryData ) {
const geometry = new THREE.BufferGeometry();
if ( geometryData.index ) {
geometry.setIndex( new THREE.BufferAttribute( geometryData.index.array, 1 ) );
}
for ( let i = 0; i < geometryData.attributes.length; i ++ ) {
const attribute = geometryData.attributes[ i ];
const name = attribute.name;
const array = attribute.array;
const itemSize = attribute.itemSize;
geometry.setAttribute( name, new THREE.BufferAttribute( array, itemSize ) );
}
return geometry;
}
_loadLibrary( url, responseType ) {
const loader = new THREE.FileLoader( this.manager );
loader.setPath( this.decoderPath );
loader.setResponseType( responseType );
loader.setWithCredentials( this.withCredentials );
return new Promise( ( resolve, reject ) => {
loader.load( url, resolve, undefined, reject );
} );
}
preload() {
this._initDecoder();
return this;
}
_initDecoder() {
if ( this.decoderPending ) return this.decoderPending;
const useJS = typeof WebAssembly !== 'object' || this.decoderConfig.type === 'js';
const librariesPending = [];
if ( useJS ) {
librariesPending.push( this._loadLibrary( 'draco_decoder.js', 'text' ) );
} else {
librariesPending.push( this._loadLibrary( 'draco_wasm_wrapper.js', 'text' ) );
librariesPending.push( this._loadLibrary( 'draco_decoder.wasm', 'arraybuffer' ) );
}
this.decoderPending = Promise.all( librariesPending ).then( libraries => {
const jsContent = libraries[ 0 ];
if ( ! useJS ) {
this.decoderConfig.wasmBinary = libraries[ 1 ];
}
const fn = DRACOWorker.toString();
const body = [ '/* draco decoder */', jsContent, '', '/* worker */', fn.substring( fn.indexOf( '{' ) + 1, fn.lastIndexOf( '}' ) ) ].join( '\n' );
this.workerSourceURL = URL.createObjectURL( new Blob( [ body ] ) );
} );
return this.decoderPending;
}
_getWorker( taskID, taskCost ) {
return this._initDecoder().then( () => {
if ( this.workerPool.length < this.workerLimit ) {
const worker = new Worker( this.workerSourceURL );
worker._callbacks = {};
worker._taskCosts = {};
worker._taskLoad = 0;
worker.postMessage( {
type: 'init',
decoderConfig: this.decoderConfig
} );
worker.onmessage = function ( e ) {
const message = e.data;
switch ( message.type ) {
case 'decode':
worker._callbacks[ message.id ].resolve( message );
break;
case 'error':
worker._callbacks[ message.id ].reject( message );
break;
default:
console.error( 'THREE.DRACOLoader: 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._taskCosts[ taskID ] = taskCost;
worker._taskLoad += taskCost;
return worker;
} );
}
_releaseTask( worker, taskID ) {
worker._taskLoad -= worker._taskCosts[ taskID ];
delete worker._callbacks[ taskID ];
delete worker._taskCosts[ taskID ];
}
debug() {
console.log( 'Task load: ', this.workerPool.map( worker => worker._taskLoad ) );
}
dispose() {
for ( let i = 0; i < this.workerPool.length; ++ i ) {
this.workerPool[ i ].terminate();
}
this.workerPool.length = 0;
return this;
}
}
/* WEB WORKER */
function DRACOWorker() {
let decoderConfig;
let decoderPending;
onmessage = function ( e ) {
const message = e.data;
switch ( message.type ) {
case 'init':
decoderConfig = message.decoderConfig;
decoderPending = new Promise( function ( resolve
/*, reject*/
) {
decoderConfig.onModuleLoaded = function ( draco ) {
// Module is Promise-like. Wrap before resolving to avoid loop.
resolve( {
draco: draco
} );
};
DracoDecoderModule( decoderConfig ); // eslint-disable-line no-undef
} );
break;
case 'decode':
const buffer = message.buffer;
const taskConfig = message.taskConfig;
decoderPending.then( module => {
const draco = module.draco;
const decoder = new draco.Decoder();
const decoderBuffer = new draco.DecoderBuffer();
decoderBuffer.Init( new Int8Array( buffer ), buffer.byteLength );
try {
const geometry = decodeGeometry( draco, decoder, decoderBuffer, taskConfig );
const buffers = geometry.attributes.map( attr => attr.array.buffer );
if ( geometry.index ) buffers.push( geometry.index.array.buffer );
self.postMessage( {
type: 'decode',
id: message.id,
geometry
}, buffers );
} catch ( error ) {
console.error( error );
self.postMessage( {
type: 'error',
id: message.id,
error: error.message
} );
} finally {
draco.destroy( decoderBuffer );
draco.destroy( decoder );
}
} );
break;
}
};
function decodeGeometry( draco, decoder, decoderBuffer, taskConfig ) {
const attributeIDs = taskConfig.attributeIDs;
const attributeTypes = taskConfig.attributeTypes;
let dracoGeometry;
let decodingStatus;
const geometryType = decoder.GetEncodedGeometryType( decoderBuffer );
if ( geometryType === draco.TRIANGULAR_MESH ) {
dracoGeometry = new draco.Mesh();
decodingStatus = decoder.DecodeBufferToMesh( decoderBuffer, dracoGeometry );
} else if ( geometryType === draco.POINT_CLOUD ) {
dracoGeometry = new draco.PointCloud();
decodingStatus = decoder.DecodeBufferToPointCloud( decoderBuffer, dracoGeometry );
} else {
throw new Error( 'THREE.DRACOLoader: Unexpected geometry type.' );
}
if ( ! decodingStatus.ok() || dracoGeometry.ptr === 0 ) {
throw new Error( 'THREE.DRACOLoader: Decoding failed: ' + decodingStatus.error_msg() );
}
const geometry = {
index: null,
attributes: []
}; // Gather all vertex attributes.
for ( const attributeName in attributeIDs ) {
const attributeType = self[ attributeTypes[ attributeName ] ];
let attribute;
let attributeID; // A Draco file may be created with default vertex attributes, whose attribute IDs
// are mapped 1:1 from their semantic name (POSITION, NORMAL, ...). Alternatively,
// a Draco file may contain a custom set of attributes, identified by known unique
// IDs. glTF files always do the latter, and `.drc` files typically do the former.
if ( taskConfig.useUniqueIDs ) {
attributeID = attributeIDs[ attributeName ];
attribute = decoder.GetAttributeByUniqueId( dracoGeometry, attributeID );
} else {
attributeID = decoder.GetAttributeId( dracoGeometry, draco[ attributeIDs[ attributeName ] ] );
if ( attributeID === - 1 ) continue;
attribute = decoder.GetAttribute( dracoGeometry, attributeID );
}
geometry.attributes.push( decodeAttribute( draco, decoder, dracoGeometry, attributeName, attributeType, attribute ) );
} // Add index.
if ( geometryType === draco.TRIANGULAR_MESH ) {
geometry.index = decodeIndex( draco, decoder, dracoGeometry );
}
draco.destroy( dracoGeometry );
return geometry;
}
function decodeIndex( draco, decoder, dracoGeometry ) {
const numFaces = dracoGeometry.num_faces();
const numIndices = numFaces * 3;
const byteLength = numIndices * 4;
const ptr = draco._malloc( byteLength );
decoder.GetTrianglesUInt32Array( dracoGeometry, byteLength, ptr );
const index = new Uint32Array( draco.HEAPF32.buffer, ptr, numIndices ).slice();
draco._free( ptr );
return {
array: index,
itemSize: 1
};
}
function decodeAttribute( draco, decoder, dracoGeometry, attributeName, attributeType, attribute ) {
const numComponents = attribute.num_components();
const numPoints = dracoGeometry.num_points();
const numValues = numPoints * numComponents;
const byteLength = numValues * attributeType.BYTES_PER_ELEMENT;
const dataType = getDracoDataType( draco, attributeType );
const ptr = draco._malloc( byteLength );
decoder.GetAttributeDataArrayForAllPoints( dracoGeometry, attribute, dataType, byteLength, ptr );
const array = new attributeType( draco.HEAPF32.buffer, ptr, numValues ).slice();
draco._free( ptr );
return {
name: attributeName,
array: array,
itemSize: numComponents
};
}
function getDracoDataType( draco, attributeType ) {
switch ( attributeType ) {
case Float32Array:
return draco.DT_FLOAT32;
case Int8Array:
return draco.DT_INT8;
case Int16Array:
return draco.DT_INT16;
case Int32Array:
return draco.DT_INT32;
case Uint8Array:
return draco.DT_UINT8;
case Uint16Array:
return draco.DT_UINT16;
case Uint32Array:
return draco.DT_UINT32;
}
}
}
THREE.DRACOLoader = DRACOLoader;
} )();
