{"version":3,"file":"KTX2Loader.cjs","sources":["../../src/loaders/KTX2Loader.js"],"sourcesContent":["/**\n * Loader for KTX 2.0 GPU Texture containers.\n *\n * KTX 2.0 is a container format for various GPU texture formats. The loader\n * supports Basis Universal GPU textures, which can be quickly transcoded to\n * a wide variety of GPU texture compression formats, as well as some\n * uncompressed DataTexture and Data3DTexture formats.\n *\n * References:\n * - KTX: http://github.khronos.org/KTX-Specification/\n * - DFD: https://www.khronos.org/registry/DataFormat/specs/1.3/dataformat.1.3.html#basicdescriptor\n */\n\nimport {\n CompressedTexture,\n DataTexture,\n FileLoader,\n FloatType,\n HalfFloatType,\n LinearFilter,\n LinearMipmapLinearFilter,\n Loader,\n RedFormat,\n RGB_ETC1_Format,\n RGB_ETC2_Format,\n RGB_PVRTC_4BPPV1_Format,\n RGB_S3TC_DXT1_Format,\n RGBA_ASTC_4x4_Format,\n RGBA_ASTC_6x6_Format,\n RGBA_BPTC_Format,\n RGBA_ETC2_EAC_Format,\n RGBA_PVRTC_4BPPV1_Format,\n RGBA_S3TC_DXT5_Format,\n RGBAFormat,\n RGFormat,\n UnsignedByteType,\n} from 'three'\nimport { WorkerPool } from '../utils/WorkerPool'\nimport {\n read,\n KHR_DF_FLAG_ALPHA_PREMULTIPLIED,\n KHR_DF_TRANSFER_SRGB,\n KHR_SUPERCOMPRESSION_NONE,\n KHR_SUPERCOMPRESSION_ZSTD,\n VK_FORMAT_UNDEFINED,\n VK_FORMAT_R16_SFLOAT,\n VK_FORMAT_R16G16_SFLOAT,\n VK_FORMAT_R16G16B16A16_SFLOAT,\n VK_FORMAT_R32_SFLOAT,\n VK_FORMAT_R32G32_SFLOAT,\n VK_FORMAT_R32G32B32A32_SFLOAT,\n VK_FORMAT_R8_SRGB,\n VK_FORMAT_R8_UNORM,\n VK_FORMAT_R8G8_SRGB,\n VK_FORMAT_R8G8_UNORM,\n VK_FORMAT_R8G8B8A8_SRGB,\n VK_FORMAT_R8G8B8A8_UNORM,\n VK_FORMAT_ASTC_6x6_SRGB_BLOCK,\n VK_FORMAT_ASTC_6x6_UNORM_BLOCK,\n KHR_DF_PRIMARIES_UNSPECIFIED,\n KHR_DF_PRIMARIES_BT709,\n KHR_DF_PRIMARIES_DISPLAYP3,\n} from '../libs/ktx-parse'\nimport { ZSTDDecoder } from '../libs/zstddec'\nimport { CompressedCubeTexture } from '../_polyfill/CompressedCubeTexture'\nimport { CompressedArrayTexture } from '../_polyfill/CompressedArrayTexture'\nimport { Data3DTexture } from '../_polyfill/Data3DTexture'\n\nconst LinearEncoding = 3000\nconst sRGBEncoding = 3001\n\nconst NoColorSpace = ''\nconst DisplayP3ColorSpace = 'display-p3'\nconst LinearDisplayP3ColorSpace = 'display-p3-linear'\nconst LinearSRGBColorSpace = 'srgb-linear'\nconst SRGBColorSpace = 'srgb'\n\nconst _taskCache = new WeakMap()\n\nlet _activeLoaders = 0\n\nlet _zstd\n\nclass KTX2Loader extends Loader {\n /* CONSTANTS */\n\n static BasisFormat = {\n ETC1S: 0,\n UASTC_4x4: 1,\n }\n\n static TranscoderFormat = {\n ETC1: 0,\n ETC2: 1,\n BC1: 2,\n BC3: 3,\n BC4: 4,\n BC5: 5,\n BC7_M6_OPAQUE_ONLY: 6,\n BC7_M5: 7,\n PVRTC1_4_RGB: 8,\n PVRTC1_4_RGBA: 9,\n ASTC_4x4: 10,\n ATC_RGB: 11,\n ATC_RGBA_INTERPOLATED_ALPHA: 12,\n RGBA32: 13,\n RGB565: 14,\n BGR565: 15,\n RGBA4444: 16,\n }\n\n static EngineFormat = {\n RGBAFormat: RGBAFormat,\n RGBA_ASTC_4x4_Format: RGBA_ASTC_4x4_Format,\n RGBA_BPTC_Format: RGBA_BPTC_Format,\n RGBA_ETC2_EAC_Format: RGBA_ETC2_EAC_Format,\n RGBA_PVRTC_4BPPV1_Format: RGBA_PVRTC_4BPPV1_Format,\n RGBA_S3TC_DXT5_Format: RGBA_S3TC_DXT5_Format,\n RGB_ETC1_Format: RGB_ETC1_Format,\n RGB_ETC2_Format: RGB_ETC2_Format,\n RGB_PVRTC_4BPPV1_Format: RGB_PVRTC_4BPPV1_Format,\n RGB_S3TC_DXT1_Format: RGB_S3TC_DXT1_Format,\n }\n\n /* WEB WORKER */\n\n static BasisWorker = function () {\n let config\n let transcoderPending\n let BasisModule\n\n const EngineFormat = KTX2Loader.EngineFormat\n const TranscoderFormat = KTX2Loader.TranscoderFormat\n const BasisFormat = KTX2Loader.BasisFormat\n\n self.addEventListener('message', function (e) {\n const message = e.data\n\n switch (message.type) {\n case 'init':\n config = message.config\n init(message.transcoderBinary)\n break\n\n case 'transcode':\n transcoderPending.then(() => {\n try {\n const { faces, buffers, width, height, hasAlpha, format, dfdFlags } = transcode(message.buffer)\n\n self.postMessage(\n { type: 'transcode', id: message.id, faces, width, height, hasAlpha, format, dfdFlags },\n buffers,\n )\n } catch (error) {\n console.error(error)\n\n self.postMessage({ type: 'error', id: message.id, error: error.message })\n }\n })\n break\n }\n })\n\n function init(wasmBinary) {\n transcoderPending = new Promise((resolve) => {\n BasisModule = { wasmBinary, onRuntimeInitialized: resolve }\n BASIS(BasisModule)\n }).then(() => {\n BasisModule.initializeBasis()\n\n if (BasisModule.KTX2File === undefined) {\n console.warn('THREE.KTX2Loader: Please update Basis Universal transcoder.')\n }\n })\n }\n\n function transcode(buffer) {\n const ktx2File = new BasisModule.KTX2File(new Uint8Array(buffer))\n\n function cleanup() {\n ktx2File.close()\n ktx2File.delete()\n }\n\n if (!ktx2File.isValid()) {\n cleanup()\n throw new Error('THREE.KTX2Loader:\tInvalid or unsupported .ktx2 file')\n }\n\n const basisFormat = ktx2File.isUASTC() ? BasisFormat.UASTC_4x4 : BasisFormat.ETC1S\n const width = ktx2File.getWidth()\n const height = ktx2File.getHeight()\n const layerCount = ktx2File.getLayers() || 1\n const levelCount = ktx2File.getLevels()\n const faceCount = ktx2File.getFaces()\n const hasAlpha = ktx2File.getHasAlpha()\n const dfdFlags = ktx2File.getDFDFlags()\n\n const { transcoderFormat, engineFormat } = getTranscoderFormat(basisFormat, width, height, hasAlpha)\n\n if (!width || !height || !levelCount) {\n cleanup()\n throw new Error('THREE.KTX2Loader:\tInvalid texture')\n }\n\n if (!ktx2File.startTranscoding()) {\n cleanup()\n throw new Error('THREE.KTX2Loader: .startTranscoding failed')\n }\n\n const faces = []\n const buffers = []\n\n for (let face = 0; face < faceCount; face++) {\n const mipmaps = []\n\n for (let mip = 0; mip < levelCount; mip++) {\n const layerMips = []\n\n let mipWidth, mipHeight\n\n for (let layer = 0; layer < layerCount; layer++) {\n const levelInfo = ktx2File.getImageLevelInfo(mip, layer, face)\n\n if (\n face === 0 &&\n mip === 0 &&\n layer === 0 &&\n (levelInfo.origWidth % 4 !== 0 || levelInfo.origHeight % 4 !== 0)\n ) {\n console.warn('THREE.KTX2Loader: ETC1S and UASTC textures should use multiple-of-four dimensions.')\n }\n\n if (levelCount > 1) {\n mipWidth = levelInfo.origWidth\n mipHeight = levelInfo.origHeight\n } else {\n // Handles non-multiple-of-four dimensions in textures without mipmaps. Textures with\n // mipmaps must use multiple-of-four dimensions, for some texture formats and APIs.\n // See mrdoob/three.js#25908.\n mipWidth = levelInfo.width\n mipHeight = levelInfo.height\n }\n\n const dst = new Uint8Array(ktx2File.getImageTranscodedSizeInBytes(mip, layer, 0, transcoderFormat))\n const status = ktx2File.transcodeImage(dst, mip, layer, face, transcoderFormat, 0, -1, -1)\n\n if (!status) {\n cleanup()\n throw new Error('THREE.KTX2Loader: .transcodeImage failed.')\n }\n\n layerMips.push(dst)\n }\n\n const mipData = concat(layerMips)\n\n mipmaps.push({ data: mipData, width: mipWidth, height: mipHeight })\n buffers.push(mipData.buffer)\n }\n\n faces.push({ mipmaps, width, height, format: engineFormat })\n }\n\n cleanup()\n\n return { faces, buffers, width, height, hasAlpha, format: engineFormat, dfdFlags }\n }\n\n //\n\n // Optimal choice of a transcoder target format depends on the Basis format (ETC1S or UASTC),\n // device capabilities, and texture dimensions. The list below ranks the formats separately\n // for ETC1S and UASTC.\n //\n // In some cases, transcoding UASTC to RGBA32 might be preferred for higher quality (at\n // significant memory cost) compared to ETC1/2, BC1/3, and PVRTC. The transcoder currently\n // chooses RGBA32 only as a last resort and does not expose that option to the caller.\n const FORMAT_OPTIONS = [\n {\n if: 'astcSupported',\n basisFormat: [BasisFormat.UASTC_4x4],\n transcoderFormat: [TranscoderFormat.ASTC_4x4, TranscoderFormat.ASTC_4x4],\n engineFormat: [EngineFormat.RGBA_ASTC_4x4_Format, EngineFormat.RGBA_ASTC_4x4_Format],\n priorityETC1S: Infinity,\n priorityUASTC: 1,\n needsPowerOfTwo: false,\n },\n {\n if: 'bptcSupported',\n basisFormat: [BasisFormat.ETC1S, BasisFormat.UASTC_4x4],\n transcoderFormat: [TranscoderFormat.BC7_M5, TranscoderFormat.BC7_M5],\n engineFormat: [EngineFormat.RGBA_BPTC_Format, EngineFormat.RGBA_BPTC_Format],\n priorityETC1S: 3,\n priorityUASTC: 2,\n needsPowerOfTwo: false,\n },\n {\n if: 'dxtSupported',\n basisFormat: [BasisFormat.ETC1S, BasisFormat.UASTC_4x4],\n transcoderFormat: [TranscoderFormat.BC1, TranscoderFormat.BC3],\n engineFormat: [EngineFormat.RGB_S3TC_DXT1_Format, EngineFormat.RGBA_S3TC_DXT5_Format],\n priorityETC1S: 4,\n priorityUASTC: 5,\n needsPowerOfTwo: false,\n },\n {\n if: 'etc2Supported',\n basisFormat: [BasisFormat.ETC1S, BasisFormat.UASTC_4x4],\n transcoderFormat: [TranscoderFormat.ETC1, TranscoderFormat.ETC2],\n engineFormat: [EngineFormat.RGB_ETC2_Format, EngineFormat.RGBA_ETC2_EAC_Format],\n priorityETC1S: 1,\n priorityUASTC: 3,\n needsPowerOfTwo: false,\n },\n {\n if: 'etc1Supported',\n basisFormat: [BasisFormat.ETC1S, BasisFormat.UASTC_4x4],\n transcoderFormat: [TranscoderFormat.ETC1],\n engineFormat: [EngineFormat.RGB_ETC1_Format],\n priorityETC1S: 2,\n priorityUASTC: 4,\n needsPowerOfTwo: false,\n },\n {\n if: 'pvrtcSupported',\n basisFormat: [BasisFormat.ETC1S, BasisFormat.UASTC_4x4],\n transcoderFormat: [TranscoderFormat.PVRTC1_4_RGB, TranscoderFormat.PVRTC1_4_RGBA],\n engineFormat: [EngineFormat.RGB_PVRTC_4BPPV1_Format, EngineFormat.RGBA_PVRTC_4BPPV1_Format],\n priorityETC1S: 5,\n priorityUASTC: 6,\n needsPowerOfTwo: true,\n },\n ]\n\n const ETC1S_OPTIONS = FORMAT_OPTIONS.sort(function (a, b) {\n return a.priorityETC1S - b.priorityETC1S\n })\n const UASTC_OPTIONS = FORMAT_OPTIONS.sort(function (a, b) {\n return a.priorityUASTC - b.priorityUASTC\n })\n\n function getTranscoderFormat(basisFormat, width, height, hasAlpha) {\n let transcoderFormat\n let engineFormat\n\n const options = basisFormat === BasisFormat.ETC1S ? ETC1S_OPTIONS : UASTC_OPTIONS\n\n for (let i = 0; i < options.length; i++) {\n const opt = options[i]\n\n if (!config[opt.if]) continue\n if (!opt.basisFormat.includes(basisFormat)) continue\n if (hasAlpha && opt.transcoderFormat.length < 2) continue\n if (opt.needsPowerOfTwo && !(isPowerOfTwo(width) && isPowerOfTwo(height))) continue\n\n transcoderFormat = opt.transcoderFormat[hasAlpha ? 1 : 0]\n engineFormat = opt.engineFormat[hasAlpha ? 1 : 0]\n\n return { transcoderFormat, engineFormat }\n }\n\n console.warn('THREE.KTX2Loader: No suitable compressed texture format found. Decoding to RGBA32.')\n\n transcoderFormat = TranscoderFormat.RGBA32\n engineFormat = EngineFormat.RGBAFormat\n\n return { transcoderFormat, engineFormat }\n }\n\n function isPowerOfTwo(value) {\n if (value <= 2) return true\n\n return (value & (value - 1)) === 0 && value !== 0\n }\n\n /** Concatenates N byte arrays. */\n function concat(arrays) {\n if (arrays.length === 1) return arrays[0]\n\n let totalByteLength = 0\n\n for (let i = 0; i < arrays.length; i++) {\n const array = arrays[i]\n totalByteLength += array.byteLength\n }\n\n const result = new Uint8Array(totalByteLength)\n\n let byteOffset = 0\n\n for (let i = 0; i < arrays.length; i++) {\n const array = arrays[i]\n result.set(array, byteOffset)\n\n byteOffset += array.byteLength\n }\n\n return result\n }\n }\n\n constructor(manager) {\n super(manager)\n\n this.transcoderPath = ''\n this.transcoderBinary = null\n this.transcoderPending = null\n\n this.workerPool = new WorkerPool()\n this.workerSourceURL = ''\n this.workerConfig = null\n\n if (typeof MSC_TRANSCODER !== 'undefined') {\n console.warn(\n 'THREE.KTX2Loader: Please update to latest \"basis_transcoder\".' +\n ' \"msc_basis_transcoder\" is no longer supported in three.js r125+.',\n )\n }\n }\n\n setTranscoderPath(path) {\n this.transcoderPath = path\n\n return this\n }\n\n setWorkerLimit(num) {\n this.workerPool.setWorkerLimit(num)\n\n return this\n }\n\n detectSupport(renderer) {\n this.workerConfig = {\n astcSupported: renderer.extensions.has('WEBGL_compressed_texture_astc'),\n etc1Supported: renderer.extensions.has('WEBGL_compressed_texture_etc1'),\n etc2Supported: renderer.extensions.has('WEBGL_compressed_texture_etc'),\n dxtSupported: renderer.extensions.has('WEBGL_compressed_texture_s3tc'),\n bptcSupported: renderer.extensions.has('EXT_texture_compression_bptc'),\n pvrtcSupported:\n renderer.extensions.has('WEBGL_compressed_texture_pvrtc') ||\n renderer.extensions.has('WEBKIT_WEBGL_compressed_texture_pvrtc'),\n }\n\n if (renderer.capabilities.isWebGL2) {\n // https://github.com/mrdoob/three.js/pull/22928\n this.workerConfig.etc1Supported = false\n }\n\n return this\n }\n\n init() {\n if (!this.transcoderPending) {\n // Load transcoder wrapper.\n const jsLoader = new FileLoader(this.manager)\n jsLoader.setPath(this.transcoderPath)\n jsLoader.setWithCredentials(this.withCredentials)\n const jsContent = jsLoader.loadAsync('basis_transcoder.js')\n\n // Load transcoder WASM binary.\n const binaryLoader = new FileLoader(this.manager)\n binaryLoader.setPath(this.transcoderPath)\n binaryLoader.setResponseType('arraybuffer')\n binaryLoader.setWithCredentials(this.withCredentials)\n const binaryContent = binaryLoader.loadAsync('basis_transcoder.wasm')\n\n this.transcoderPending = Promise.all([jsContent, binaryContent]).then(([jsContent, binaryContent]) => {\n const fn = KTX2Loader.BasisWorker.toString()\n\n const body = [\n '/* constants */',\n 'let _EngineFormat = ' + JSON.stringify(KTX2Loader.EngineFormat),\n 'let _TranscoderFormat = ' + JSON.stringify(KTX2Loader.TranscoderFormat),\n 'let _BasisFormat = ' + JSON.stringify(KTX2Loader.BasisFormat),\n '/* basis_transcoder.js */',\n jsContent,\n '/* worker */',\n fn.substring(fn.indexOf('{') + 1, fn.lastIndexOf('}')),\n ].join('\\n')\n\n this.workerSourceURL = URL.createObjectURL(new Blob([body]))\n this.transcoderBinary = binaryContent\n\n this.workerPool.setWorkerCreator(() => {\n const worker = new Worker(this.workerSourceURL)\n const transcoderBinary = this.transcoderBinary.slice(0)\n\n worker.postMessage({ type: 'init', config: this.workerConfig, transcoderBinary }, [transcoderBinary])\n\n return worker\n })\n })\n\n if (_activeLoaders > 0) {\n // Each instance loads a transcoder and allocates workers, increasing network and memory cost.\n\n console.warn(\n 'THREE.KTX2Loader: Multiple active KTX2 loaders may cause performance issues.' +\n ' Use a single KTX2Loader instance, or call .dispose() on old instances.',\n )\n }\n\n _activeLoaders++\n }\n\n return this.transcoderPending\n }\n\n load(url, onLoad, onProgress, onError) {\n if (this.workerConfig === null) {\n throw new Error('THREE.KTX2Loader: Missing initialization with `.detectSupport( renderer )`.')\n }\n\n const loader = new FileLoader(this.manager)\n\n loader.setResponseType('arraybuffer')\n loader.setWithCredentials(this.withCredentials)\n\n loader.load(\n url,\n (buffer) => {\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 return cachedTask.promise.then(onLoad).catch(onError)\n }\n\n this._createTexture(buffer)\n .then((texture) => (onLoad ? onLoad(texture) : null))\n .catch(onError)\n },\n onProgress,\n onError,\n )\n }\n\n _createTextureFrom(transcodeResult, container) {\n const { faces, width, height, format, type, error, dfdFlags } = transcodeResult\n\n if (type === 'error') return Promise.reject(error)\n\n let texture\n\n if (container.faceCount === 6) {\n texture = new CompressedCubeTexture(faces, format, UnsignedByteType)\n } else {\n const mipmaps = faces[0].mipmaps\n\n texture =\n container.layerCount > 1\n ? new CompressedArrayTexture(mipmaps, width, height, container.layerCount, format, UnsignedByteType)\n : new CompressedTexture(mipmaps, width, height, format, UnsignedByteType)\n }\n\n texture.minFilter = faces[0].mipmaps.length === 1 ? LinearFilter : LinearMipmapLinearFilter\n texture.magFilter = LinearFilter\n texture.generateMipmaps = false\n texture.needsUpdate = true\n\n const colorSpace = parseColorSpace(container)\n if ('colorSpace' in texture) texture.colorSpace = colorSpace\n else texture.encoding = colorSpace === SRGBColorSpace ? sRGBEncoding : LinearEncoding\n\n texture.premultiplyAlpha = !!(dfdFlags & KHR_DF_FLAG_ALPHA_PREMULTIPLIED)\n\n return texture\n }\n\n /**\n * @param {ArrayBuffer} buffer\n * @param {object?} config\n * @return {Promise}\n */\n async _createTexture(buffer, config = {}) {\n const container = read(new Uint8Array(buffer))\n\n if (container.vkFormat !== VK_FORMAT_UNDEFINED) {\n return createRawTexture(container)\n }\n\n //\n\n const taskConfig = config\n const texturePending = this.init()\n .then(() => {\n return this.workerPool.postMessage({ type: 'transcode', buffer, taskConfig: taskConfig }, [buffer])\n })\n .then((e) => this._createTextureFrom(e.data, container))\n\n // Cache the task result.\n _taskCache.set(buffer, { promise: texturePending })\n\n return texturePending\n }\n\n dispose() {\n this.workerPool.dispose()\n if (this.workerSourceURL) URL.revokeObjectURL(this.workerSourceURL)\n\n _activeLoaders--\n\n return this\n }\n}\n\n//\n// Parsing for non-Basis textures. These textures are may have supercompression\n// like Zstd, but they do not require transcoding.\n\nconst UNCOMPRESSED_FORMATS = new Set([RGBAFormat, RGFormat, RedFormat])\n\nconst FORMAT_MAP = {\n [VK_FORMAT_R32G32B32A32_SFLOAT]: RGBAFormat,\n [VK_FORMAT_R16G16B16A16_SFLOAT]: RGBAFormat,\n [VK_FORMAT_R8G8B8A8_UNORM]: RGBAFormat,\n [VK_FORMAT_R8G8B8A8_SRGB]: RGBAFormat,\n\n [VK_FORMAT_R32G32_SFLOAT]: RGFormat,\n [VK_FORMAT_R16G16_SFLOAT]: RGFormat,\n [VK_FORMAT_R8G8_UNORM]: RGFormat,\n [VK_FORMAT_R8G8_SRGB]: RGFormat,\n\n [VK_FORMAT_R32_SFLOAT]: RedFormat,\n [VK_FORMAT_R16_SFLOAT]: RedFormat,\n [VK_FORMAT_R8_SRGB]: RedFormat,\n [VK_FORMAT_R8_UNORM]: RedFormat,\n\n [VK_FORMAT_ASTC_6x6_SRGB_BLOCK]: RGBA_ASTC_6x6_Format,\n [VK_FORMAT_ASTC_6x6_UNORM_BLOCK]: RGBA_ASTC_6x6_Format,\n}\n\nconst TYPE_MAP = {\n [VK_FORMAT_R32G32B32A32_SFLOAT]: FloatType,\n [VK_FORMAT_R16G16B16A16_SFLOAT]: HalfFloatType,\n [VK_FORMAT_R8G8B8A8_UNORM]: UnsignedByteType,\n [VK_FORMAT_R8G8B8A8_SRGB]: UnsignedByteType,\n\n [VK_FORMAT_R32G32_SFLOAT]: FloatType,\n [VK_FORMAT_R16G16_SFLOAT]: HalfFloatType,\n [VK_FORMAT_R8G8_UNORM]: UnsignedByteType,\n [VK_FORMAT_R8G8_SRGB]: UnsignedByteType,\n\n [VK_FORMAT_R32_SFLOAT]: FloatType,\n [VK_FORMAT_R16_SFLOAT]: HalfFloatType,\n [VK_FORMAT_R8_SRGB]: UnsignedByteType,\n [VK_FORMAT_R8_UNORM]: UnsignedByteType,\n\n [VK_FORMAT_ASTC_6x6_SRGB_BLOCK]: UnsignedByteType,\n [VK_FORMAT_ASTC_6x6_UNORM_BLOCK]: UnsignedByteType,\n}\n\nasync function createRawTexture(container) {\n const { vkFormat } = container\n\n if (FORMAT_MAP[vkFormat] === undefined) {\n throw new Error('THREE.KTX2Loader: Unsupported vkFormat.')\n }\n\n //\n\n let zstd\n\n if (container.supercompressionScheme === KHR_SUPERCOMPRESSION_ZSTD) {\n if (!_zstd) {\n _zstd = new Promise(async (resolve) => {\n const zstd = new ZSTDDecoder()\n await zstd.init()\n resolve(zstd)\n })\n }\n\n zstd = await _zstd\n }\n\n //\n\n const mipmaps = []\n\n for (let levelIndex = 0; levelIndex < container.levels.length; levelIndex++) {\n const levelWidth = Math.max(1, container.pixelWidth >> levelIndex)\n const levelHeight = Math.max(1, container.pixelHeight >> levelIndex)\n const levelDepth = container.pixelDepth ? Math.max(1, container.pixelDepth >> levelIndex) : 0\n\n const level = container.levels[levelIndex]\n\n let levelData\n\n if (container.supercompressionScheme === KHR_SUPERCOMPRESSION_NONE) {\n levelData = level.levelData\n } else if (container.supercompressionScheme === KHR_SUPERCOMPRESSION_ZSTD) {\n levelData = zstd.decode(level.levelData, level.uncompressedByteLength)\n } else {\n throw new Error('THREE.KTX2Loader: Unsupported supercompressionScheme.')\n }\n\n let data\n\n if (TYPE_MAP[vkFormat] === FloatType) {\n data = new Float32Array(\n levelData.buffer,\n levelData.byteOffset,\n levelData.byteLength / Float32Array.BYTES_PER_ELEMENT,\n )\n } else if (TYPE_MAP[vkFormat] === HalfFloatType) {\n data = new Uint16Array(\n levelData.buffer,\n levelData.byteOffset,\n levelData.byteLength / Uint16Array.BYTES_PER_ELEMENT,\n )\n } else {\n data = levelData\n }\n\n mipmaps.push({\n data: data,\n width: levelWidth,\n height: levelHeight,\n depth: levelDepth,\n })\n }\n\n let texture\n\n if (UNCOMPRESSED_FORMATS.has(FORMAT_MAP[vkFormat])) {\n texture =\n container.pixelDepth === 0\n ? new DataTexture(mipmaps[0].data, container.pixelWidth, container.pixelHeight)\n : new Data3DTexture(mipmaps[0].data, container.pixelWidth, container.pixelHeight, container.pixelDepth)\n } else {\n if (container.pixelDepth > 0) throw new Error('THREE.KTX2Loader: Unsupported pixelDepth.')\n\n texture = new CompressedTexture(mipmaps, container.pixelWidth, container.pixelHeight)\n }\n\n texture.mipmaps = mipmaps\n\n texture.type = TYPE_MAP[vkFormat]\n texture.format = FORMAT_MAP[vkFormat]\n texture.needsUpdate = true\n\n const colorSpace = parseColorSpace(container)\n if ('colorSpace' in texture) texture.colorSpace = colorSpace\n else texture.encoding = colorSpace === SRGBColorSpace ? sRGBEncoding : LinearEncoding\n\n //\n\n return Promise.resolve(texture)\n}\n\nfunction parseColorSpace(container) {\n const dfd = container.dataFormatDescriptor[0]\n\n if (dfd.colorPrimaries === KHR_DF_PRIMARIES_BT709) {\n return dfd.transferFunction === KHR_DF_TRANSFER_SRGB ? SRGBColorSpace : LinearSRGBColorSpace\n } else if (dfd.colorPrimaries === KHR_DF_PRIMARIES_DISPLAYP3) {\n return dfd.transferFunction === KHR_DF_TRANSFER_SRGB ? DisplayP3ColorSpace : LinearDisplayP3ColorSpace\n } else if (dfd.colorPrimaries === KHR_DF_PRIMARIES_UNSPECIFIED) {\n return NoColorSpace\n } else {\n console.warn(`THREE.KTX2Loader: Unsupported color primaries, \"${dfd.colorPrimaries}\"`)\n return NoColorSpace\n }\n}\n\nexport { KTX2Loader 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