three-stdlib/loaders/DDSLoader.cjs

stand-alone library of threejs examples

"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const THREE = require("three");
class DDSLoader extends THREE.CompressedTextureLoader {
  constructor(manager) {
    super(manager);
  }
  parse(buffer, loadMipmaps) {
    const dds = { mipmaps: [], width: 0, height: 0, format: null, mipmapCount: 1 };
    const DDS_MAGIC = 542327876;
    const DDSD_MIPMAPCOUNT = 131072;
    const DDSCAPS2_CUBEMAP = 512;
    const DDSCAPS2_CUBEMAP_POSITIVEX = 1024;
    const DDSCAPS2_CUBEMAP_NEGATIVEX = 2048;
    const DDSCAPS2_CUBEMAP_POSITIVEY = 4096;
    const DDSCAPS2_CUBEMAP_NEGATIVEY = 8192;
    const DDSCAPS2_CUBEMAP_POSITIVEZ = 16384;
    const DDSCAPS2_CUBEMAP_NEGATIVEZ = 32768;
    const DDPF_FOURCC = 4;
    function fourCCToInt32(value) {
      return value.charCodeAt(0) + (value.charCodeAt(1) << 8) + (value.charCodeAt(2) << 16) + (value.charCodeAt(3) << 24);
    }
    function int32ToFourCC(value) {
      return String.fromCharCode(value & 255, value >> 8 & 255, value >> 16 & 255, value >> 24 & 255);
    }
    function loadARGBMip(buffer2, dataOffset2, width, height) {
      const dataLength = width * height * 4;
      const srcBuffer = new Uint8Array(buffer2, dataOffset2, dataLength);
      const byteArray = new Uint8Array(dataLength);
      let dst = 0;
      let src = 0;
      for (let y = 0; y < height; y++) {
        for (let x = 0; x < width; x++) {
          const b = srcBuffer[src];
          src++;
          const g = srcBuffer[src];
          src++;
          const r = srcBuffer[src];
          src++;
          const a = srcBuffer[src];
          src++;
          byteArray[dst] = r;
          dst++;
          byteArray[dst] = g;
          dst++;
          byteArray[dst] = b;
          dst++;
          byteArray[dst] = a;
          dst++;
        }
      }
      return byteArray;
    }
    const FOURCC_DXT1 = fourCCToInt32("DXT1");
    const FOURCC_DXT3 = fourCCToInt32("DXT3");
    const FOURCC_DXT5 = fourCCToInt32("DXT5");
    const FOURCC_ETC1 = fourCCToInt32("ETC1");
    const headerLengthInt = 31;
    const off_magic = 0;
    const off_size = 1;
    const off_flags = 2;
    const off_height = 3;
    const off_width = 4;
    const off_mipmapCount = 7;
    const off_pfFlags = 20;
    const off_pfFourCC = 21;
    const off_RGBBitCount = 22;
    const off_RBitMask = 23;
    const off_GBitMask = 24;
    const off_BBitMask = 25;
    const off_ABitMask = 26;
    const off_caps2 = 28;
    const header = new Int32Array(buffer, 0, headerLengthInt);
    if (header[off_magic] !== DDS_MAGIC) {
      console.error("THREE.DDSLoader.parse: Invalid magic number in DDS header.");
      return dds;
    }
    if (!header[off_pfFlags] & DDPF_FOURCC) {
      console.error("THREE.DDSLoader.parse: Unsupported format, must contain a FourCC code.");
      return dds;
    }
    let blockBytes;
    const fourCC = header[off_pfFourCC];
    let isRGBAUncompressed = false;
    switch (fourCC) {
      case FOURCC_DXT1:
        blockBytes = 8;
        dds.format = THREE.RGB_S3TC_DXT1_Format;
        break;
      case FOURCC_DXT3:
        blockBytes = 16;
        dds.format = THREE.RGBA_S3TC_DXT3_Format;
        break;
      case FOURCC_DXT5:
        blockBytes = 16;
        dds.format = THREE.RGBA_S3TC_DXT5_Format;
        break;
      case FOURCC_ETC1:
        blockBytes = 8;
        dds.format = THREE.RGB_ETC1_Format;
        break;
      default:
        if (header[off_RGBBitCount] === 32 && header[off_RBitMask] & 16711680 && header[off_GBitMask] & 65280 && header[off_BBitMask] & 255 && header[off_ABitMask] & 4278190080) {
          isRGBAUncompressed = true;
          blockBytes = 64;
          dds.format = THREE.RGBAFormat;
        } else {
          console.error("THREE.DDSLoader.parse: Unsupported FourCC code ", int32ToFourCC(fourCC));
          return dds;
        }
    }
    dds.mipmapCount = 1;
    if (header[off_flags] & DDSD_MIPMAPCOUNT && loadMipmaps !== false) {
      dds.mipmapCount = Math.max(1, header[off_mipmapCount]);
    }
    const caps2 = header[off_caps2];
    dds.isCubemap = caps2 & DDSCAPS2_CUBEMAP ? true : false;
    if (dds.isCubemap && (!(caps2 & DDSCAPS2_CUBEMAP_POSITIVEX) || !(caps2 & DDSCAPS2_CUBEMAP_NEGATIVEX) || !(caps2 & DDSCAPS2_CUBEMAP_POSITIVEY) || !(caps2 & DDSCAPS2_CUBEMAP_NEGATIVEY) || !(caps2 & DDSCAPS2_CUBEMAP_POSITIVEZ) || !(caps2 & DDSCAPS2_CUBEMAP_NEGATIVEZ))) {
      console.error("THREE.DDSLoader.parse: Incomplete cubemap faces");
      return dds;
    }
    dds.width = header[off_width];
    dds.height = header[off_height];
    let dataOffset = header[off_size] + 4;
    const faces = dds.isCubemap ? 6 : 1;
    for (let face = 0; face < faces; face++) {
      let width = dds.width;
      let height = dds.height;
      for (let i = 0; i < dds.mipmapCount; i++) {
        let byteArray, dataLength;
        if (isRGBAUncompressed) {
          byteArray = loadARGBMip(buffer, dataOffset, width, height);
          dataLength = byteArray.length;
        } else {
          dataLength = Math.max(4, width) / 4 * Math.max(4, height) / 4 * blockBytes;
          byteArray = new Uint8Array(buffer, dataOffset, dataLength);
        }
        const mipmap = { data: byteArray, width, height };
        dds.mipmaps.push(mipmap);
        dataOffset += dataLength;
        width = Math.max(width >> 1, 1);
        height = Math.max(height >> 1, 1);
      }
    }
    return dds;
  }
}
exports.DDSLoader = DDSLoader;
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