public static GltfBinaryReaderBase GetBynaryReader(int version, GltfRoot root, byte[] chunk)
{
switch (version)
{
case 2:
return(new GltfBinaryReaderV2(root, chunk));
case 1:
default:
throw new NotImplementedException($"Version {version} not implemented");
}
}
public Scene Read()
{
//The 12-byte header consists of three 4-byte entries:
_header = new GlbHeader();
//magic equals 0x46546C67. It is ASCII string glTF, and can be used to identify data as Binary glTF.
_header.Magic = _stream.ReadUInt <LittleEndianConverter>();
//version indicates the version of the Binary glTF container format. This specification defines version 2.
_header.Version = _stream.ReadUInt <LittleEndianConverter>();
//length is the total length of the Binary glTF, including Header and all Chunks, in bytes.
_header.Length = _stream.ReadUInt <LittleEndianConverter>();
if (_header.Version != 2)
{
throw new NotImplementedException($"Version {_header.Version} not implemented");
}
//Chunk 0 Json
uint jsonChunkLength = _stream.ReadUInt <LittleEndianConverter>();
string jsonChunkType = _stream.ReadString(4);
if (jsonChunkType != "JSON")
{
throw new GltfReaderException("Chunk type does not match", _stream.Position);
}
_root = JsonConvert.DeserializeObject <GltfRoot>(_stream.ReadString((int)jsonChunkLength));
//Chunk 1 bin
uint binChunkLength = _stream.ReadUInt <LittleEndianConverter>();
string binChunkType = _stream.ReadString(4);
//Check the chunk type
if (binChunkType != "BIN\0")
{
throw new GltfReaderException("Chunk type does not match", _stream.Position);
}
byte[] binChunk = _stream.ReadBytes((int)binChunkLength);
_binaryStream = new StreamIO(binChunk);
return(GltfBinaryReaderBase.GetBynaryReader((int)_header.Version, _root, binChunk).Read());
}
protected Dictionary <int, StreamIO> _buffers; //TODO: implement gltf reader for multiple buffers
public GltfBinaryReaderBase(GltfRoot root, byte[] chunk)
{
this._root = root;
this._chunk = new StreamIO(chunk);
}
public GltfBinaryReaderV2(GltfRoot root, byte[] chunk) : base(root, chunk)
{
}
