(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.STLLoader = mod.exports;
  }
})(typeof globalThis !== "undefined" ? globalThis : typeof self !== "undefined" ? self : this, function (_exports, _three) {
  "use strict";

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

  /**
   * Description: A THREE loader for STL ASCII files, as created by Solidworks and other CAD programs.
   *
   * Supports both binary and ASCII encoded files, with automatic detection of type.
   *
   * The loader returns a non-indexed buffer geometry.
   *
   * Limitations:
   *  Binary decoding supports "Magics" color format (http://en.wikipedia.org/wiki/STL_(file_format)#Color_in_binary_STL).
   *  There is perhaps some question as to how valid it is to always assume little-endian-ness.
   *  ASCII decoding assumes file is UTF-8.
   *
   * Usage:
   *  const loader = new STLLoader();
   *  loader.load( './models/stl/slotted_disk.stl', function ( geometry ) {
   *    scene.add( new THREE.Mesh( geometry ) );
   *  });
   *
   * For binary STLs geometry might contain colors for vertices. To use it:
   *  // use the same code to load STL as above
   *  if (geometry.hasColors) {
   *    material = new THREE.MeshPhongMaterial({ opacity: geometry.alpha, vertexColors: true });
   *  } else { .... }
   *  const mesh = new THREE.Mesh( geometry, material );
   *
   * For ASCII STLs containing multiple solids, each solid is assigned to a different group.
   * Groups can be used to assign a different color by defining an array of materials with the same length of
   * geometry.groups and passing it to the Mesh constructor:
   *
   * const mesh = new THREE.Mesh( geometry, material );
   *
   * For example:
   *
   *  const materials = [];
   *  const nGeometryGroups = geometry.groups.length;
   *
   *  const colorMap = ...; // Some logic to index colors.
   *
   *  for (let i = 0; i < nGeometryGroups; i++) {
   *
   *		const material = new THREE.MeshPhongMaterial({
   *			color: colorMap[i],
   *			wireframe: false
   *		});
   *
   *  }
   *
   *  materials.push(material);
   *  const mesh = new THREE.Mesh(geometry, materials);
   */
  var STLLoader = /*#__PURE__*/function (_Loader) {
    _inherits(STLLoader, _Loader);

    var _super = _createSuper(STLLoader);

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

      return _super.call(this, manager);
    }

    _createClass(STLLoader, [{
      key: "load",
      value: function load(url, onLoad, onProgress, onError) {
        var scope = this;
        var loader = new _three.FileLoader(this.manager);
        loader.setPath(this.path);
        loader.setResponseType('arraybuffer');
        loader.setRequestHeader(this.requestHeader);
        loader.setWithCredentials(this.withCredentials);
        loader.load(url, function (text) {
          try {
            onLoad(scope.parse(text));
          } catch (e) {
            if (onError) {
              onError(e);
            } else {
              console.error(e);
            }

            scope.manager.itemError(url);
          }
        }, onProgress, onError);
      }
    }, {
      key: "parse",
      value: function parse(data) {
        function isBinary(data) {
          var reader = new DataView(data);
          var face_size = 32 / 8 * 3 + 32 / 8 * 3 * 3 + 16 / 8;
          var n_faces = reader.getUint32(80, true);
          var expect = 80 + 32 / 8 + n_faces * face_size;

          if (expect === reader.byteLength) {
            return true;
          } // An ASCII STL data must begin with 'solid ' as the first six bytes.
          // However, ASCII STLs lacking the SPACE after the 'd' are known to be
          // plentiful.  So, check the first 5 bytes for 'solid'.
          // Several encodings, such as UTF-8, precede the text with up to 5 bytes:
          // https://en.wikipedia.org/wiki/Byte_order_mark#Byte_order_marks_by_encoding
          // Search for "solid" to start anywhere after those prefixes.
          // US-ASCII ordinal values for 's', 'o', 'l', 'i', 'd'


          var solid = [115, 111, 108, 105, 100];

          for (var off = 0; off < 5; off++) {
            // If "solid" text is matched to the current offset, declare it to be an ASCII STL.
            if (matchDataViewAt(solid, reader, off)) return false;
          } // Couldn't find "solid" text at the beginning; it is binary STL.


          return true;
        }

        function matchDataViewAt(query, reader, offset) {
          // Check if each byte in query matches the corresponding byte from the current offset
          for (var i = 0, il = query.length; i < il; i++) {
            if (query[i] !== reader.getUint8(offset + i, false)) return false;
          }

          return true;
        }

        function parseBinary(data) {
          var reader = new DataView(data);
          var faces = reader.getUint32(80, true);
          var r,
              g,
              b,
              hasColors = false,
              colors;
          var defaultR, defaultG, defaultB, alpha; // process STL header
          // check for default color in header ("COLOR=rgba" sequence).

          for (var index = 0; index < 80 - 10; index++) {
            if (reader.getUint32(index, false) == 0x434F4C4F
            /*COLO*/
            && reader.getUint8(index + 4) == 0x52
            /*'R'*/
            && reader.getUint8(index + 5) == 0x3D
            /*'='*/
            ) {
              hasColors = true;
              colors = new Float32Array(faces * 3 * 3);
              defaultR = reader.getUint8(index + 6) / 255;
              defaultG = reader.getUint8(index + 7) / 255;
              defaultB = reader.getUint8(index + 8) / 255;
              alpha = reader.getUint8(index + 9) / 255;
            }
          }

          var dataOffset = 84;
          var faceLength = 12 * 4 + 2;
          var geometry = new _three.BufferGeometry();
          var vertices = new Float32Array(faces * 3 * 3);
          var normals = new Float32Array(faces * 3 * 3);

          for (var face = 0; face < faces; face++) {
            var start = dataOffset + face * faceLength;
            var normalX = reader.getFloat32(start, true);
            var normalY = reader.getFloat32(start + 4, true);
            var normalZ = reader.getFloat32(start + 8, true);

            if (hasColors) {
              var packedColor = reader.getUint16(start + 48, true);

              if ((packedColor & 0x8000) === 0) {
                // facet has its own unique color
                r = (packedColor & 0x1F) / 31;
                g = (packedColor >> 5 & 0x1F) / 31;
                b = (packedColor >> 10 & 0x1F) / 31;
              } else {
                r = defaultR;
                g = defaultG;
                b = defaultB;
              }
            }

            for (var i = 1; i <= 3; i++) {
              var vertexstart = start + i * 12;
              var componentIdx = face * 3 * 3 + (i - 1) * 3;
              vertices[componentIdx] = reader.getFloat32(vertexstart, true);
              vertices[componentIdx + 1] = reader.getFloat32(vertexstart + 4, true);
              vertices[componentIdx + 2] = reader.getFloat32(vertexstart + 8, true);
              normals[componentIdx] = normalX;
              normals[componentIdx + 1] = normalY;
              normals[componentIdx + 2] = normalZ;

              if (hasColors) {
                colors[componentIdx] = r;
                colors[componentIdx + 1] = g;
                colors[componentIdx + 2] = b;
              }
            }
          }

          geometry.setAttribute('position', new _three.BufferAttribute(vertices, 3));
          geometry.setAttribute('normal', new _three.BufferAttribute(normals, 3));

          if (hasColors) {
            geometry.setAttribute('color', new _three.BufferAttribute(colors, 3));
            geometry.hasColors = true;
            geometry.alpha = alpha;
          }

          return geometry;
        }

        function parseASCII(data) {
          var geometry = new _three.BufferGeometry();
          var patternSolid = /solid([\s\S]*?)endsolid/g;
          var patternFace = /facet([\s\S]*?)endfacet/g;
          var faceCounter = 0;
          var patternFloat = /[\s]+([+-]?(?:\d*)(?:\.\d*)?(?:[eE][+-]?\d+)?)/.source;
          var patternVertex = new RegExp('vertex' + patternFloat + patternFloat + patternFloat, 'g');
          var patternNormal = new RegExp('normal' + patternFloat + patternFloat + patternFloat, 'g');
          var vertices = [];
          var normals = [];
          var normal = new _three.Vector3();
          var result;
          var groupCount = 0;
          var startVertex = 0;
          var endVertex = 0;

          while ((result = patternSolid.exec(data)) !== null) {
            startVertex = endVertex;
            var solid = result[0];

            while ((result = patternFace.exec(solid)) !== null) {
              var vertexCountPerFace = 0;
              var normalCountPerFace = 0;
              var text = result[0];

              while ((result = patternNormal.exec(text)) !== null) {
                normal.x = parseFloat(result[1]);
                normal.y = parseFloat(result[2]);
                normal.z = parseFloat(result[3]);
                normalCountPerFace++;
              }

              while ((result = patternVertex.exec(text)) !== null) {
                vertices.push(parseFloat(result[1]), parseFloat(result[2]), parseFloat(result[3]));
                normals.push(normal.x, normal.y, normal.z);
                vertexCountPerFace++;
                endVertex++;
              } // every face have to own ONE valid normal


              if (normalCountPerFace !== 1) {
                console.error('THREE.STLLoader: Something isn\'t right with the normal of face number ' + faceCounter);
              } // each face have to own THREE valid vertices


              if (vertexCountPerFace !== 3) {
                console.error('THREE.STLLoader: Something isn\'t right with the vertices of face number ' + faceCounter);
              }

              faceCounter++;
            }

            var start = startVertex;
            var count = endVertex - startVertex;
            geometry.addGroup(start, count, groupCount);
            groupCount++;
          }

          geometry.setAttribute('position', new _three.Float32BufferAttribute(vertices, 3));
          geometry.setAttribute('normal', new _three.Float32BufferAttribute(normals, 3));
          return geometry;
        }

        function ensureString(buffer) {
          if (typeof buffer !== 'string') {
            return _three.LoaderUtils.decodeText(new Uint8Array(buffer));
          }

          return buffer;
        }

        function ensureBinary(buffer) {
          if (typeof buffer === 'string') {
            var array_buffer = new Uint8Array(buffer.length);

            for (var i = 0; i < buffer.length; i++) {
              array_buffer[i] = buffer.charCodeAt(i) & 0xff; // implicitly assumes little-endian
            }

            return array_buffer.buffer || array_buffer;
          } else {
            return buffer;
          }
        } // start


        var binData = ensureBinary(data);
        return isBinary(binData) ? parseBinary(binData) : parseASCII(ensureString(data));
      }
    }]);

    return STLLoader;
  }(_three.Loader);

  _exports.STLLoader = STLLoader;
});