three-stdlib/loaders/PRWMLoader.cjs

stand-alone library of threejs examples

"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const THREE = require("three");
let bigEndianPlatform = null;
function isBigEndianPlatform() {
  if (bigEndianPlatform === null) {
    const buffer = new ArrayBuffer(2), uint8Array = new Uint8Array(buffer), uint16Array = new Uint16Array(buffer);
    uint8Array[0] = 170;
    uint8Array[1] = 187;
    bigEndianPlatform = uint16Array[0] === 43707;
  }
  return bigEndianPlatform;
}
const InvertedEncodingTypes = [
  null,
  Float32Array,
  null,
  Int8Array,
  Int16Array,
  null,
  Int32Array,
  Uint8Array,
  Uint16Array,
  null,
  Uint32Array
];
const getMethods = {
  Uint16Array: "getUint16",
  Uint32Array: "getUint32",
  Int16Array: "getInt16",
  Int32Array: "getInt32",
  Float32Array: "getFloat32",
  Float64Array: "getFloat64"
};
function copyFromBuffer(sourceArrayBuffer, viewType, position, length, fromBigEndian) {
  const bytesPerElement = viewType.BYTES_PER_ELEMENT;
  let result;
  if (fromBigEndian === isBigEndianPlatform() || bytesPerElement === 1) {
    result = new viewType(sourceArrayBuffer, position, length);
  } else {
    const readView = new DataView(sourceArrayBuffer, position, length * bytesPerElement), getMethod = getMethods[viewType.name], littleEndian = !fromBigEndian;
    result = new viewType(length);
    for (let i = 0; i < length; i++) {
      result[i] = readView[getMethod](i * bytesPerElement, littleEndian);
    }
  }
  return result;
}
function decodePrwm(buffer) {
  const array = new Uint8Array(buffer), version = array[0];
  let flags = array[1];
  const indexedGeometry = !!(flags >> 7 & 1), indicesType = flags >> 6 & 1, bigEndian = (flags >> 5 & 1) === 1, attributesNumber = flags & 31;
  let valuesNumber = 0, indicesNumber = 0;
  if (bigEndian) {
    valuesNumber = (array[2] << 16) + (array[3] << 8) + array[4];
    indicesNumber = (array[5] << 16) + (array[6] << 8) + array[7];
  } else {
    valuesNumber = array[2] + (array[3] << 8) + (array[4] << 16);
    indicesNumber = array[5] + (array[6] << 8) + (array[7] << 16);
  }
  if (version === 0) {
    throw new Error("PRWM decoder: Invalid format version: 0");
  } else if (version !== 1) {
    throw new Error("PRWM decoder: Unsupported format version: " + version);
  }
  if (!indexedGeometry) {
    if (indicesType !== 0) {
      throw new Error("PRWM decoder: Indices type must be set to 0 for non-indexed geometries");
    } else if (indicesNumber !== 0) {
      throw new Error("PRWM decoder: Number of indices must be set to 0 for non-indexed geometries");
    }
  }
  let pos = 8;
  const attributes = {};
  for (let i = 0; i < attributesNumber; i++) {
    let attributeName = "";
    while (pos < array.length) {
      const char = array[pos];
      pos++;
      if (char === 0) {
        break;
      } else {
        attributeName += String.fromCharCode(char);
      }
    }
    flags = array[pos];
    const attributeType = flags >> 7 & 1;
    const cardinality = (flags >> 4 & 3) + 1;
    const encodingType = flags & 15;
    const arrayType = InvertedEncodingTypes[encodingType];
    pos++;
    pos = Math.ceil(pos / 4) * 4;
    const values = copyFromBuffer(buffer, arrayType, pos, cardinality * valuesNumber, bigEndian);
    pos += arrayType.BYTES_PER_ELEMENT * cardinality * valuesNumber;
    attributes[attributeName] = {
      type: attributeType,
      cardinality,
      values
    };
  }
  pos = Math.ceil(pos / 4) * 4;
  let indices = null;
  if (indexedGeometry) {
    indices = copyFromBuffer(buffer, indicesType === 1 ? Uint32Array : Uint16Array, pos, indicesNumber, bigEndian);
  }
  return {
    version,
    attributes,
    indices
  };
}
const PRWMLoader = /* @__PURE__ */ (() => {
  class PRWMLoader2 extends THREE.Loader {
    constructor(manager) {
      super(manager);
    }
    load(url, onLoad, onProgress, onError) {
      const scope = this;
      const loader = new THREE.FileLoader(scope.manager);
      loader.setPath(scope.path);
      loader.setResponseType("arraybuffer");
      loader.setRequestHeader(scope.requestHeader);
      loader.setWithCredentials(scope.withCredentials);
      url = url.replace(/\*/g, isBigEndianPlatform() ? "be" : "le");
      loader.load(
        url,
        function(arrayBuffer) {
          try {
            onLoad(scope.parse(arrayBuffer));
          } catch (e) {
            if (onError) {
              onError(e);
            } else {
              console.error(e);
            }
            scope.manager.itemError(url);
          }
        },
        onProgress,
        onError
      );
    }
    parse(arrayBuffer) {
      const data = decodePrwm(arrayBuffer), attributesKey = Object.keys(data.attributes), bufferGeometry = new THREE.BufferGeometry();
      for (let i = 0; i < attributesKey.length; i++) {
        const attribute = data.attributes[attributesKey[i]];
        bufferGeometry.setAttribute(
          attributesKey[i],
          new THREE.BufferAttribute(attribute.values, attribute.cardinality, attribute.normalized)
        );
      }
      if (data.indices !== null) {
        bufferGeometry.setIndex(new THREE.BufferAttribute(data.indices, 1));
      }
      return bufferGeometry;
    }
    static isBigEndianPlatform() {
      return isBigEndianPlatform();
    }
  }
  return PRWMLoader2;
})();
exports.PRWMLoader = PRWMLoader;
//# sourceMappingURL=PRWMLoader.cjs.map