three-stdlib/loaders/DRACOLoader.cjs.map

stand-alone library of threejs examples

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