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{"version":3,"file":"BasisParser.mjs","sources":["../../src/loader/BasisParser.ts"],"sourcesContent":["import { CompressedTextureResource } from '@pixi/compressed-textures';\nimport { BufferResource, settings, TYPES } from '@pixi/core';\nimport {\n BASIS_FORMAT_TO_INTERNAL_FORMAT,\n BASIS_FORMATS,\n BASIS_FORMATS_ALPHA,\n INTERNAL_FORMAT_TO_BASIS_FORMAT,\n} from '../Basis';\nimport { TranscoderWorker } from '../TranscoderWorker';\n\nimport type { CompressedLevelBuffer, INTERNAL_FORMATS } from '@pixi/compressed-textures';\nimport type { BasisBinding, BasisTextureExtensions } from '../Basis';\n\nexport type TranscodedResourcesArray = (Array<CompressedTextureResource> | Array<BufferResource>) & {\n basisFormat: BASIS_FORMATS\n};\n\n/**\n * Loader plugin for handling BASIS supercompressed texture files.\n *\n * To use this loader, you must bind the basis_universal WebAssembly transcoder. There are two ways of\n * doing this:\n *\n * 1. Adding a <script> tag to your HTML page to the transcoder bundle in this package, and serving\n * the WASM binary from the same location.\n *\n * ```html\n * <!-- Copy ./node_modules/@pixi/basis/assets/basis_.wasm into your assets directory\n * as well, so it is served from the same folder as the JavaScript! -->\n * <script src=\"./node_modules/@pixi/basis/assets/basis_transcoder.js\"></script>\n * ```\n *\n * NOTE: `basis_transcoder.js` expects the WebAssembly binary to be named `basis_transcoder.wasm`.\n * NOTE-2: This method supports transcoding on the main-thread. Only use this if you have 1 or 2 *.basis\n * files.\n *\n * 2. Loading the transcoder source from a URL.\n *\n * ```js\n * // Use this if you to use the default CDN url for @pixi/basis\n * BasisParser.loadTranscoder();\n *\n * // Use this if you want to serve the transcoder on your own\n * BasisParser.loadTranscoder('./basis_transcoder.js', './basis_transcoder.wasm');\n * ```\n *\n * NOTE: This can only be used with web-workers.\n * @class\n * @memberof PIXI\n * @implements {PIXI.ILoaderPlugin}\n */\nexport class BasisParser\n{\n public static basisBinding: BasisBinding;\n private static defaultRGBFormat: { basisFormat: BASIS_FORMATS, textureFormat: INTERNAL_FORMATS | TYPES };\n private static defaultRGBAFormat: { basisFormat: BASIS_FORMATS, textureFormat: INTERNAL_FORMATS | TYPES };\n private static fallbackMode = false;\n private static workerPool: TranscoderWorker[] = [];\n\n /**\n * Runs transcoding and populates imageArray. It will run the transcoding in a web worker\n * if they are available.\n * @private\n */\n public static async transcode(arrayBuffer: ArrayBuffer): Promise<TranscodedResourcesArray>\n {\n let resources: TranscodedResourcesArray;\n\n if (typeof Worker !== 'undefined' && BasisParser.TranscoderWorker.wasmSource)\n {\n resources = await BasisParser.transcodeAsync(arrayBuffer);\n }\n else\n {\n resources = BasisParser.transcodeSync(arrayBuffer);\n }\n\n return resources;\n }\n\n /**\n * Finds a suitable worker for transcoding and sends a transcoding request\n * @private\n * @async\n */\n public static async transcodeAsync(arrayBuffer: ArrayBuffer): Promise<TranscodedResourcesArray>\n {\n if (!BasisParser.defaultRGBAFormat && !BasisParser.defaultRGBFormat)\n {\n BasisParser.autoDetectFormats();\n }\n\n const workerPool = BasisParser.workerPool;\n\n let leastLoad = 0x10000000;\n let worker = null;\n\n for (let i = 0, j = workerPool.length; i < j; i++)\n {\n if (workerPool[i].load < leastLoad)\n {\n worker = workerPool[i];\n leastLoad = worker.load;\n }\n }\n\n if (!worker)\n {\n /* eslint-disable-next-line no-use-before-define */\n worker = new TranscoderWorker();\n\n workerPool.push(worker);\n }\n\n // Wait until worker is ready\n await worker.initAsync();\n\n const response = await worker.transcodeAsync(\n new Uint8Array(arrayBuffer),\n BasisParser.defaultRGBAFormat.basisFormat,\n BasisParser.defaultRGBFormat.basisFormat,\n );\n\n const basisFormat = response.basisFormat;\n const imageArray = response.imageArray;\n\n // whether it is an uncompressed format\n const fallbackMode = basisFormat > 12;\n let imageResources: TranscodedResourcesArray;\n\n if (!fallbackMode)\n {\n const format = BASIS_FORMAT_TO_INTERNAL_FORMAT[response.basisFormat];\n\n // HINT: this.imageArray is CompressedTextureResource[]\n imageResources = new Array<CompressedTextureResource>(imageArray.length) as TranscodedResourcesArray;\n\n for (let i = 0, j = imageArray.length; i < j; i++)\n {\n imageResources[i] = new CompressedTextureResource(null, {\n format,\n width: imageArray[i].width,\n height: imageArray[i].height,\n levelBuffers: imageArray[i].levelArray,\n levels: imageArray[i].levelArray.length,\n });\n }\n }\n else\n {\n // TODO: BufferResource does not support manual mipmapping.\n imageResources = imageArray.map((image) => new BufferResource(\n new Uint16Array(image.levelArray[0].levelBuffer.buffer), {\n width: image.width,\n height: image.height,\n }),\n ) as TranscodedResourcesArray;\n }\n\n imageResources.basisFormat = basisFormat;\n\n return imageResources;\n }\n\n /**\n * Runs transcoding on the main thread.\n * @private\n */\n public static transcodeSync(arrayBuffer: ArrayBuffer): TranscodedResourcesArray\n {\n if (!BasisParser.defaultRGBAFormat && !BasisParser.defaultRGBFormat)\n {\n BasisParser.autoDetectFormats();\n }\n\n const BASIS = BasisParser.basisBinding;\n\n const data = new Uint8Array(arrayBuffer);\n const basisFile = new BASIS.BasisFile(data);\n const imageCount = basisFile.getNumImages();\n const hasAlpha = basisFile.getHasAlpha();\n\n const basisFormat = hasAlpha\n ? BasisParser.defaultRGBAFormat.basisFormat\n : BasisParser.defaultRGBFormat.basisFormat;\n const basisFallbackFormat = BASIS_FORMATS.cTFRGB565;\n const imageResources = new Array<CompressedTextureResource | BufferResource>(imageCount);\n\n let fallbackMode = BasisParser.fallbackMode;\n\n if (!basisFile.startTranscoding())\n {\n if (process.env.DEBUG)\n {\n console.error(`Basis failed to start transcoding!`);\n }\n\n basisFile.close();\n basisFile.delete();\n\n return null;\n }\n\n for (let i = 0; i < imageCount; i++)\n {\n // Don't transcode all mipmap levels in fallback mode!\n const levels = !fallbackMode ? basisFile.getNumLevels(i) : 1;\n const width = basisFile.getImageWidth(i, 0);\n const height = basisFile.getImageHeight(i, 0);\n const alignedWidth = (width + 3) & ~3;\n const alignedHeight = (height + 3) & ~3;\n\n const imageLevels = new Array<CompressedLevelBuffer>(levels);\n\n // Transcode mipmap levels into \"imageLevels\"\n for (let j = 0; j < levels; j++)\n {\n const levelWidth = basisFile.getImageWidth(i, j);\n const levelHeight = basisFile.getImageHeight(i, j);\n const byteSize = basisFile.getImageTranscodedSizeInBytes(\n i, 0, !fallbackMode ? basisFormat : basisFallbackFormat);\n\n imageLevels[j] = {\n levelID: j,\n levelBuffer: new Uint8Array(byteSize),\n levelWidth,\n levelHeight,\n };\n\n if (!basisFile.transcodeImage(\n imageLevels[j].levelBuffer, i, 0, !fallbackMode ? basisFormat : basisFallbackFormat, false, false))\n {\n if (fallbackMode)\n {\n if (process.env.DEBUG)\n {\n console.error(`Basis failed to transcode image ${i}, level ${0}!`);\n }\n break;\n }\n else\n {\n // Try transcoding to an uncompressed format before giving up!\n // NOTE: We must start all over again as all Resources must be in compressed OR uncompressed.\n i = -1;\n fallbackMode = true;\n\n if (process.env.DEBUG)\n {\n /* eslint-disable-next-line max-len */\n console.warn(`Basis failed to transcode image ${i}, level ${0} to a compressed texture format. Retrying to an uncompressed fallback format!`);\n }\n continue;\n }\n }\n }\n\n let imageResource;\n\n if (!fallbackMode)\n {\n imageResource = new CompressedTextureResource(null, {\n format: BASIS_FORMAT_TO_INTERNAL_FORMAT[basisFormat],\n width: alignedWidth,\n height: alignedHeight,\n levelBuffers: imageLevels,\n levels,\n });\n }\n else\n {\n // TODO: BufferResource doesn't support manual mipmap levels\n imageResource = new BufferResource(\n new Uint16Array(imageLevels[0].levelBuffer.buffer), { width, height });\n }\n\n imageResources[i] = imageResource;\n }\n\n basisFile.close();\n basisFile.delete();\n\n const transcodedResources = imageResources as TranscodedResourcesArray;\n\n transcodedResources.basisFormat = !fallbackMode ? basisFormat : basisFallbackFormat;\n\n return transcodedResources;\n }\n\n /**\n * Detects the available compressed texture formats on the device.\n * @param extensions - extensions provided by a WebGL context\n * @ignore\n */\n static autoDetectFormats(extensions?: Partial<BasisTextureExtensions>): void\n {\n // Auto-detect WebGL compressed-texture extensions\n if (!extensions)\n {\n const canvas = settings.ADAPTER.createCanvas();\n const gl = canvas.getContext('webgl');\n\n if (!gl)\n {\n console.error('WebGL not available for BASIS transcoding. Silently failing.');\n\n return;\n }\n\n extensions = {\n bptc: gl.getExtension('EXT_texture_compression_bptc'),\n astc: gl.getExtension('WEBGL_compressed_texture_astc'),\n etc: gl.getExtension('WEBGL_compressed_texture_etc'),\n s3tc: gl.getExtension('WEBGL_compressed_texture_s3tc'),\n s3tc_sRGB: gl.getExtension('WEBGL_compressed_texture_s3tc_srgb'), /* eslint-disable-line camelcase */\n pvrtc: gl.getExtension('WEBGL_compressed_texture_pvrtc')\n || gl.getExtension('WEBKIT_WEBGL_compressed_texture_pvrtc'),\n etc1: gl.getExtension('WEBGL_compressed_texture_etc1'),\n atc: gl.getExtension('WEBGL_compressed_texture_atc'),\n };\n }\n\n // Discover the available texture formats\n const supportedFormats: { [id: string]: INTERNAL_FORMATS } = {};\n\n for (const key in extensions)\n {\n const extension = (extensions as any)[key];\n\n if (!extension)\n {\n continue;\n }\n\n Object.assign(supportedFormats, Object.getPrototypeOf(extension));\n }\n\n // Set the default alpha/non-alpha output formats for basisu transcoding\n for (let i = 0; i < 2; i++)\n {\n const detectWithAlpha = !!i;\n let internalFormat: number;\n let basisFormat: number;\n\n for (const id in supportedFormats)\n {\n internalFormat = supportedFormats[id];\n basisFormat = INTERNAL_FORMAT_TO_BASIS_FORMAT[internalFormat];\n\n if (basisFormat !== undefined)\n {\n if ((detectWithAlpha && BASIS_FORMATS_ALPHA[basisFormat])\n || (!detectWithAlpha && !BASIS_FORMATS_ALPHA[basisFormat]))\n {\n break;\n }\n }\n }\n\n if (internalFormat)\n {\n BasisParser[detectWithAlpha ? 'defaultRGBAFormat' : 'defaultRGBFormat'] = {\n textureFormat: internalFormat,\n basisFormat,\n };\n }\n else\n {\n BasisParser[detectWithAlpha ? 'defaultRGBAFormat' : 'defaultRGBFormat'] = {\n textureFormat: TYPES.UNSIGNED_SHORT_5_6_5,\n basisFormat: BASIS_FORMATS.cTFRGB565,\n };\n\n BasisParser.fallbackMode = true;\n }\n }\n }\n\n /**\n * Binds the basis_universal transcoder to decompress *.basis files. You must initialize the transcoder library yourself.\n * @example\n * import { BasisParser } from '@pixi/basis';\n *\n * // BASIS() returns a Promise-like object\n * globalThis.BASIS().then((basisLibrary) =>\n * {\n * // Initialize basis-library; otherwise, transcoded results maybe corrupt!\n * basisLibrary.initializeBasis();\n *\n * // Bind BasisParser to the transcoder\n * BasisParser.bindTranscoder(basisLibrary);\n * });\n * @param basisLibrary - the initialized transcoder library\n * @private\n */\n static bindTranscoder(basisLibrary: BasisBinding): void\n {\n BasisParser.basisBinding = basisLibrary;\n }\n\n /**\n * Loads the transcoder source code for use in {@link PIXI.BasisParser.TranscoderWorker}.\n * @private\n * @param jsURL - URL to the javascript basis transcoder\n * @param wasmURL - URL to the wasm basis transcoder\n */\n static loadTranscoder(jsURL: string, wasmURL: string): Promise<[void, void]>\n {\n return BasisParser.TranscoderWorker.loadTranscoder(jsURL, wasmURL);\n }\n\n /**\n * Set the transcoder source code directly\n * @private\n * @param jsSource - source for the javascript basis transcoder\n * @param wasmSource - source for the wasm basis transcoder\n */\n static setTranscoder(jsSource: string, wasmSource: ArrayBuffer): void\n {\n BasisParser.TranscoderWorker.setTranscoder(jsSource, wasmSource);\n }\n\n static TranscoderWorker: typeof TranscoderWorker = TranscoderWorker;\n\n static get TRANSCODER_WORKER_POOL_LIMIT(): number\n {\n return this.workerPool.length || 1;\n }\n\n static set TRANSCODER_WORKER_POOL_LIMIT(limit: number)\n {\n // TODO: Destroy workers?\n for (let i = this.workerPool.length; 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