GLTFBinaryExtension constructor

GLTFBinaryExtension(ByteBuffer data)

Implementation

GLTFBinaryExtension(ByteBuffer data) {
  // var headerView = new DataView( data, 0, BINARY_EXTENSION_HEADER_LENGTH );
  var headerView = ByteData.view(data, 0, BINARY_EXTENSION_HEADER_LENGTH);

  this.header = {
    "magic": LoaderUtils.decodeText(data.asUint8List(0, 4)),
    "version": headerView.getUint32(4, Endian.host),
    "length": headerView.getUint32(8, Endian.host)
  };

  if (this.header["magic"] != BINARY_EXTENSION_HEADER_MAGIC) {
    throw ('THREE.GLTFLoader: Unsupported glTF-Binary header.');
  } else if (this.header["version"] < 2.0) {
    throw ('THREE.GLTFLoader: Legacy binary file detected.');
  }

  // var chunkView = new DataView( data, BINARY_EXTENSION_HEADER_LENGTH );
  var chunkView = ByteData.view(data, BINARY_EXTENSION_HEADER_LENGTH);
  var chunkIndex = 0;

  while (chunkIndex < chunkView.lengthInBytes) {
    var chunkLength = chunkView.getUint32(chunkIndex, Endian.host);
    chunkIndex += 4;

    var chunkType = chunkView.getUint32(chunkIndex, Endian.host);
    chunkIndex += 4;

    if (chunkType == BINARY_EXTENSION_CHUNK_TYPES["JSON"]) {
      var contentArray = Uint8List.view(
          data, BINARY_EXTENSION_HEADER_LENGTH + chunkIndex, chunkLength);
      this.content = LoaderUtils.decodeText(contentArray);
    } else if (chunkType == BINARY_EXTENSION_CHUNK_TYPES["BIN"]) {
      var byteOffset = BINARY_EXTENSION_HEADER_LENGTH + chunkIndex;

      this.body = Uint8List.view(data)
          .sublist(byteOffset, byteOffset + chunkLength)
          .buffer;
    }

    // Clients must ignore chunks with unknown types.

    chunkIndex += chunkLength;
  }

  if (this.content == null) {
    throw ('THREE.GLTFLoader: JSON content not found.');
  }
}