toGlb method

Implementation

Uint8List toGlb() {
  final bin = _buffer();
  final out = Map<String, dynamic>.of(json)
    ..['buffers'] = [
      {'byteLength': bin.length},
    ];
  var jsonBytes = utf8.encode(jsonEncode(out));
  final pad = (4 - jsonBytes.length % 4) % 4;
  jsonBytes = Uint8List.fromList([...jsonBytes, ...List.filled(pad, 0x20)]);
  final total = 12 + 8 + jsonBytes.length + 8 + bin.length;
  final b = BytesBuilder()
    ..add(_u32s([0x46546c67, 2, total]))
    ..add(_u32s([jsonBytes.length, 0x4e4f534a]))
    ..add(jsonBytes)
    ..add(_u32s([bin.length, 0x004e4942]))
    ..add(bin);
  return b.toBytes();
}