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{"version":3,"file":"parseKTX.mjs","sources":["../../src/parsers/parseKTX.ts"],"sourcesContent":["import { BufferResource, FORMATS, TYPES } from '@pixi/core';\nimport { INTERNAL_FORMAT_TO_BYTES_PER_PIXEL } from '../const';\nimport { CompressedTextureResource } from '../resources';\n\nimport type { CompressedLevelBuffer } from '../resources';\n\n/**\n * The 12-byte KTX file identifier\n * @see https://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/#2.1\n * @ignore\n */\nconst FILE_IDENTIFIER = [0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A];\n\n/**\n * The value stored in the \"endianness\" field.\n * @see https://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/#2.2\n * @ignore\n */\nconst ENDIANNESS = 0x04030201;\n\n/**\n * Byte offsets of the KTX file header fields\n * @ignore\n */\nconst KTX_FIELDS = {\n FILE_IDENTIFIER: 0,\n ENDIANNESS: 12,\n GL_TYPE: 16,\n GL_TYPE_SIZE: 20,\n GL_FORMAT: 24,\n GL_INTERNAL_FORMAT: 28,\n GL_BASE_INTERNAL_FORMAT: 32,\n PIXEL_WIDTH: 36,\n PIXEL_HEIGHT: 40,\n PIXEL_DEPTH: 44,\n NUMBER_OF_ARRAY_ELEMENTS: 48,\n NUMBER_OF_FACES: 52,\n NUMBER_OF_MIPMAP_LEVELS: 56,\n BYTES_OF_KEY_VALUE_DATA: 60\n};\n\n/**\n * Byte size of the file header fields in {@code KTX_FIELDS}\n * @ignore\n */\nconst FILE_HEADER_SIZE = 64;\n\n/**\n * Maps {@link PIXI.TYPES} to the bytes taken per component, excluding those ones that are bit-fields.\n * @ignore\n */\nexport const TYPES_TO_BYTES_PER_COMPONENT: { [id: number]: number } = {\n [TYPES.UNSIGNED_BYTE]: 1,\n [TYPES.UNSIGNED_SHORT]: 2,\n [TYPES.INT]: 4,\n [TYPES.UNSIGNED_INT]: 4,\n [TYPES.FLOAT]: 4,\n [TYPES.HALF_FLOAT]: 8\n};\n\n/**\n * Number of components in each {@link PIXI.FORMATS}\n * @ignore\n */\nexport const FORMATS_TO_COMPONENTS: { [id: number]: number } = {\n [FORMATS.RGBA]: 4,\n [FORMATS.RGB]: 3,\n [FORMATS.RG]: 2,\n [FORMATS.RED]: 1,\n [FORMATS.LUMINANCE]: 1,\n [FORMATS.LUMINANCE_ALPHA]: 2,\n [FORMATS.ALPHA]: 1\n};\n\n/**\n * Number of bytes per pixel in bit-field types in {@link PIXI.TYPES}\n * @ignore\n */\nexport const TYPES_TO_BYTES_PER_PIXEL: { [id: number]: number } = {\n [TYPES.UNSIGNED_SHORT_4_4_4_4]: 2,\n [TYPES.UNSIGNED_SHORT_5_5_5_1]: 2,\n [TYPES.UNSIGNED_SHORT_5_6_5]: 2\n};\n\nexport function parseKTX(url: string, arrayBuffer: ArrayBuffer, loadKeyValueData = false): {\n compressed?: CompressedTextureResource[]\n uncompressed?: { resource: BufferResource, type: TYPES, format: FORMATS }[]\n kvData: Map<string, DataView> | null\n}\n{\n const dataView = new DataView(arrayBuffer);\n\n if (!validate(url, dataView))\n {\n return null;\n }\n\n const littleEndian = dataView.getUint32(KTX_FIELDS.ENDIANNESS, true) === ENDIANNESS;\n const glType = dataView.getUint32(KTX_FIELDS.GL_TYPE, littleEndian);\n // const glTypeSize = dataView.getUint32(KTX_FIELDS.GL_TYPE_SIZE, littleEndian);\n const glFormat = dataView.getUint32(KTX_FIELDS.GL_FORMAT, littleEndian);\n const glInternalFormat = dataView.getUint32(KTX_FIELDS.GL_INTERNAL_FORMAT, littleEndian);\n const pixelWidth = dataView.getUint32(KTX_FIELDS.PIXEL_WIDTH, littleEndian);\n const pixelHeight = dataView.getUint32(KTX_FIELDS.PIXEL_HEIGHT, littleEndian) || 1;// \"pixelHeight = 0\" -> \"1\"\n const pixelDepth = dataView.getUint32(KTX_FIELDS.PIXEL_DEPTH, littleEndian) || 1;// ^^\n const numberOfArrayElements = dataView.getUint32(KTX_FIELDS.NUMBER_OF_ARRAY_ELEMENTS, littleEndian) || 1;// ^^\n const numberOfFaces = dataView.getUint32(KTX_FIELDS.NUMBER_OF_FACES, littleEndian);\n const numberOfMipmapLevels = dataView.getUint32(KTX_FIELDS.NUMBER_OF_MIPMAP_LEVELS, littleEndian);\n const bytesOfKeyValueData = dataView.getUint32(KTX_FIELDS.BYTES_OF_KEY_VALUE_DATA, littleEndian);\n\n // Whether the platform architecture is little endian. If littleEndian !== platformLittleEndian, then the\n // file contents must be endian-converted!\n // TODO: Endianness conversion\n // const platformLittleEndian = new Uint8Arr
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