(function (global, factory) {
  if (typeof define === "function" && define.amd) {
    define(["exports", "three"], factory);
  } else if (typeof exports !== "undefined") {
    factory(exports, require("three"));
  } else {
    var mod = {
      exports: {}
    };
    factory(mod.exports, global.three);
    global.DDSLoader = mod.exports;
  }
})(typeof globalThis !== "undefined" ? globalThis : typeof self !== "undefined" ? self : this, function (_exports, _three) {
  "use strict";

  Object.defineProperty(_exports, "__esModule", {
    value: true
  });
  _exports.DDSLoader = void 0;

  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

  function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

  function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }

  function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } Object.defineProperty(subClass, "prototype", { value: Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }), writable: false }); if (superClass) _setPrototypeOf(subClass, superClass); }

  function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

  function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }

  function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } else if (call !== void 0) { throw new TypeError("Derived constructors may only return object or undefined"); } return _assertThisInitialized(self); }

  function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

  function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }

  function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

  var DDSLoader = /*#__PURE__*/function (_CompressedTextureLoa) {
    _inherits(DDSLoader, _CompressedTextureLoa);

    var _super = _createSuper(DDSLoader);

    function DDSLoader(manager) {
      _classCallCheck(this, DDSLoader);

      return _super.call(this, manager);
    }

    _createClass(DDSLoader, [{
      key: "parse",
      value: function parse(buffer, loadMipmaps) {
        var dds = {
          mipmaps: [],
          width: 0,
          height: 0,
          format: null,
          mipmapCount: 1
        }; // Adapted from @toji's DDS utils
        // https://github.com/toji/webgl-texture-utils/blob/master/texture-util/dds.js
        // All values and structures referenced from:
        // http://msdn.microsoft.com/en-us/library/bb943991.aspx/

        var DDS_MAGIC = 0x20534444; // let DDSD_CAPS = 0x1;
        // let DDSD_HEIGHT = 0x2;
        // let DDSD_WIDTH = 0x4;
        // let DDSD_PITCH = 0x8;
        // let DDSD_PIXELFORMAT = 0x1000;

        var DDSD_MIPMAPCOUNT = 0x20000; // let DDSD_LINEARSIZE = 0x80000;
        // let DDSD_DEPTH = 0x800000;
        // let DDSCAPS_COMPLEX = 0x8;
        // let DDSCAPS_MIPMAP = 0x400000;
        // let DDSCAPS_TEXTURE = 0x1000;

        var DDSCAPS2_CUBEMAP = 0x200;
        var DDSCAPS2_CUBEMAP_POSITIVEX = 0x400;
        var DDSCAPS2_CUBEMAP_NEGATIVEX = 0x800;
        var DDSCAPS2_CUBEMAP_POSITIVEY = 0x1000;
        var DDSCAPS2_CUBEMAP_NEGATIVEY = 0x2000;
        var DDSCAPS2_CUBEMAP_POSITIVEZ = 0x4000;
        var DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x8000; // let DDSCAPS2_VOLUME = 0x200000;
        // let DDPF_ALPHAPIXELS = 0x1;
        // let DDPF_ALPHA = 0x2;

        var DDPF_FOURCC = 0x4; // let DDPF_RGB = 0x40;
        // let DDPF_YUV = 0x200;
        // let DDPF_LUMINANCE = 0x20000;

        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 & 0xff, value >> 8 & 0xff, value >> 16 & 0xff, value >> 24 & 0xff);
        }

        function loadARGBMip(buffer, dataOffset, width, height) {
          var dataLength = width * height * 4;
          var srcBuffer = new Uint8Array(buffer, dataOffset, dataLength);
          var byteArray = new Uint8Array(dataLength);
          var dst = 0;
          var src = 0;

          for (var y = 0; y < height; y++) {
            for (var x = 0; x < width; x++) {
              var b = srcBuffer[src];
              src++;
              var g = srcBuffer[src];
              src++;
              var r = srcBuffer[src];
              src++;
              var a = srcBuffer[src];
              src++;
              byteArray[dst] = r;
              dst++; //r

              byteArray[dst] = g;
              dst++; //g

              byteArray[dst] = b;
              dst++; //b

              byteArray[dst] = a;
              dst++; //a
            }
          }

          return byteArray;
        }

        var FOURCC_DXT1 = fourCCToInt32('DXT1');
        var FOURCC_DXT3 = fourCCToInt32('DXT3');
        var FOURCC_DXT5 = fourCCToInt32('DXT5');
        var FOURCC_ETC1 = fourCCToInt32('ETC1');
        var headerLengthInt = 31; // The header length in 32 bit ints
        // Offsets into the header array

        var off_magic = 0;
        var off_size = 1;
        var off_flags = 2;
        var off_height = 3;
        var off_width = 4;
        var off_mipmapCount = 7;
        var off_pfFlags = 20;
        var off_pfFourCC = 21;
        var off_RGBBitCount = 22;
        var off_RBitMask = 23;
        var off_GBitMask = 24;
        var off_BBitMask = 25;
        var off_ABitMask = 26; // let off_caps = 27;

        var off_caps2 = 28; // let off_caps3 = 29;
        // let off_caps4 = 30;
        // Parse header

        var 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;
        }

        var blockBytes;
        var fourCC = header[off_pfFourCC];
        var 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] & 0xff0000 && header[off_GBitMask] & 0xff00 && header[off_BBitMask] & 0xff && header[off_ABitMask] & 0xff000000) {
              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]);
        }

        var 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];
        var dataOffset = header[off_size] + 4; // Extract mipmaps buffers

        var faces = dds.isCubemap ? 6 : 1;

        for (var face = 0; face < faces; face++) {
          var width = dds.width;
          var height = dds.height;

          for (var i = 0; i < dds.mipmapCount; i++) {
            var byteArray = void 0,
                dataLength = void 0;

            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);
            }

            var mipmap = {
              'data': byteArray,
              'width': width,
              'height': height
            };
            dds.mipmaps.push(mipmap);
            dataOffset += dataLength;
            width = Math.max(width >> 1, 1);
            height = Math.max(height >> 1, 1);
          }
        }

        return dds;
      }
    }]);

    return DDSLoader;
  }(_three.CompressedTextureLoader);

  _exports.DDSLoader = DDSLoader;
});