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{"version":3,"file":"parseDDS.mjs","sources":["../../../src/compressed-textures/dds/parseDDS.ts"],"sourcesContent":["import { DDS, DXGI_TO_TEXTURE_FORMAT, FOURCC_TO_TEXTURE_FORMAT, TEXTURE_FORMAT_BLOCK_SIZE } from './const';\n\nimport type { TEXTURE_FORMATS } from '../../rendering/renderers/shared/texture/const';\nimport type { TextureSourceOptions } from '../../rendering/renderers/shared/texture/sources/TextureSource';\n\nexport function parseDDS(arrayBuffer: ArrayBuffer, supportedFormats: TEXTURE_FORMATS[]): TextureSourceOptions<Uint8Array[]>\n{\n const {\n format,\n fourCC,\n width,\n height,\n dataOffset,\n mipmapCount,\n } = parseDDSHeader(arrayBuffer);\n\n if (!supportedFormats.includes(format))\n {\n throw new Error(`Unsupported texture format: ${fourCC} ${format}, supported: ${supportedFormats}`);\n }\n\n if (mipmapCount <= 1)\n { // No need bothering with the imageSize calculation!\n return {\n format,\n width,\n height,\n resource: [new Uint8Array(arrayBuffer, dataOffset)],\n alphaMode: 'no-premultiply-alpha',\n } as TextureSourceOptions;\n }\n\n const levelBuffers = getMipmapLevelBuffers(format, width, height, dataOffset, mipmapCount, arrayBuffer);\n\n const textureOptions: TextureSourceOptions = {\n format,\n width,\n height,\n resource: levelBuffers,\n alphaMode: 'no-premultiply-alpha'\n };\n\n return textureOptions;\n}\n\nfunction getMipmapLevelBuffers(format: TEXTURE_FORMATS, width: number, height: number,\n dataOffset: any, mipmapCount: number, arrayBuffer: ArrayBuffer)\n{\n const levelBuffers = [];\n const blockBytes = TEXTURE_FORMAT_BLOCK_SIZE[format];\n\n let mipWidth = width;\n let mipHeight = height;\n let offset = dataOffset;\n\n for (let level = 0; level < mipmapCount; ++level)\n {\n const byteLength = blockBytes\n ? Math.max(4, mipWidth) / 4 * Math.max(4, mipHeight) / 4 * blockBytes\n : mipWidth * mipHeight * 4;\n\n const levelBuffer = new Uint8Array(arrayBuffer, offset, byteLength);\n\n levelBuffers.push(levelBuffer);\n\n offset += byteLength;\n\n mipWidth = Math.max(mipWidth >> 1, 1);\n mipHeight = Math.max(mipHeight >> 1, 1);\n }\n\n return levelBuffers;\n}\n\nfunction parseDDSHeader(buffer: ArrayBuffer)\n{\n const header = new Uint32Array(buffer, 0, DDS.HEADER_SIZE / Uint32Array.BYTES_PER_ELEMENT);\n\n if (header[DDS.HEADER_FIELDS.MAGIC] !== DDS.MAGIC_VALUE)\n {\n throw new Error('Invalid magic number in DDS header');\n }\n\n // DDS header fields\n const height = header[DDS.HEADER_FIELDS.HEIGHT];\n const width = header[DDS.HEADER_FIELDS.WIDTH];\n const mipmapCount = Math.max(1, header[DDS.HEADER_FIELDS.MIPMAP_COUNT]);\n const flags = header[DDS.HEADER_FIELDS.PF_FLAGS];\n const fourCC = header[DDS.HEADER_FIELDS.FOURCC];\n const format = getTextureFormat(header, flags, fourCC, buffer);\n\n const dataOffset = DDS.MAGIC_SIZE + DDS.HEADER_SIZE\n + ((fourCC === DDS.D3DFMT.DX10) ? DDS.HEADER_DX10_SIZE : 0);\n\n return {\n format,\n fourCC,\n width,\n height,\n dataOffset,\n mipmapCount\n };\n}\n\nfunction getTextureFormat(header: Uint32Array, flags: number, fourCC: number, buffer: ArrayBuffer)\n{\n if (flags & DDS.PIXEL_FORMAT_FLAGS.FOURCC)\n {\n if (fourCC === DDS.D3DFMT.DX10)\n {\n const dx10Header = new Uint32Array(\n buffer,\n DDS.MAGIC_SIZE + DDS.HEADER_SIZE, // there is a 20-byte DDS_HEADER_DX10 after DDS_HEADER\n DDS.HEADER_DX10_SIZE / Uint32Array.BYTES_PER_ELEMENT);\n\n const miscFlag = dx10Header[DDS.HEADER_DX10_FIELDS.MISC_FLAG];\n\n if (miscFlag === DDS.RESOURCE_MISC_TEXTURECUBE)\n {\n throw new Error('DDSParser does not support cubemap textures');\n }\n\n const resourceDimension = dx10Header[DDS.HEADER_DX10_FIELDS.RESOURCE_DIMENSION];\n\n if (resourceDimension === DDS.D3D10_RESOURCE_DIMENSION.DDS_DIMENSION_TEXTURE3D)\n {\n throw new Error('DDSParser does not supported 3D texture data');\n }\n\n const dxgiFormat = 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Error('DDSParser does not support single-channel (alpha) texture data!');\n }\n\n throw new Error('DDSParser failed to load a texture file due to an unknown reason!');\n}\n\nfunction getUncompressedTextureFormat(header: Uint32Array)\n{\n const bitCount = header[DDS.HEADER_FIELDS.RGB_BITCOUNT];\n const rBitMask = header[DDS.HEADER_FIELDS.R_BIT_MASK];\n const gBitMask = header[DDS.HEADER_FIELDS.G_BIT_MASK];\n const bBitMask = header[DDS.HEADER_FIELDS.B_BIT_MASK];\n const aBitMask = header[DDS.HEADER_FIELDS.A_BIT_MASK];\n\n // https://learn.microsoft.com/en-us/windows/win32/direct3ddds/dx-graphics-dds-pguide\n // https://github.com/microsoft/DirectXTex/blob/main/DDSTextureLoader/DDSTextureLoader11.cpp#L892\n switch (bitCount)\n {\n case 32:\n if (rBitMask === 0x000000ff && gBitMask === 0x0000ff00 && bBitMask === 0x00ff0000 && aBitMask === 0xff000000)\n {\n return DXGI_TO_TEXTURE_FORMAT[DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM];\n }\n if (rBitMask === 0x00ff0000 && gBitMask === 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bBitMask === 0x001f && aBitMask === 0x8000)\n {\n return DXGI_TO_TEXTURE_FORMAT[DDS.DXGI_FORMAT.DXGI_FORMAT_B5G5R5A1_UNORM];\n }\n if (rBitMask === 0xf800 && gBitMask === 0x07e0 && bBitMask === 0x001f && aBitMask === 0)\n {\n return DXGI_TO_TEXTURE_FORMAT[DDS.DXGI_FORMAT.DXGI_FORMAT_B5G6R5_UNORM];\n }\n if (rBitMask === 0x0f00 && gBitMask === 0x00f0 && bBitMask === 0x000f && aBitMask === 0xf000)\n {\n return DXGI_TO_TEXTURE_FORMAT[DDS.DXGI_FORMAT.DXGI_FORMAT_B4G4R4A4_UNORM];\n }\n if (rBitMask === 0x00ff && gBitMask === 0 && bBitMask === 0 && aBitMask === 0xff00)\n {\n return DXGI_TO_TEXTURE_FORMAT[DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8_UNORM];\n }\n if (rBitMask === 0xffff && gBitMask === 0 && bBitMask === 0 && aBitMask === 0)\n {\n return DXGI_TO_TEXTURE_FORMAT[DDS.DXGI_FORMAT.DXGI_FORMAT_R16_UNORM];\n }\n break;\n\n case 8:\n if (rBitMask === 0xff && gBitMask === 0 && bBitMask === 0 && aBitMask === 0)\n {\n return DXGI_TO_TEXTURE_FORMAT[DDS.DXGI_FORMAT.DXGI_FORMAT_R8_UNORM];\n }\n 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