public static byte[] UnpackNormals(byte[] data, VertexAttributeType attributeType, ref int stride)
{
switch (attributeType)
{
case VertexAttributeType.TangentSpaceUnitVectorsCompressed:
var packedElementSize = attributeType.GetSize();
stride = Vector3.SizeInBytes * 3;
var count = (data.Length / packedElementSize);
var bufferLength = count * stride;
var buffer = new byte[bufferLength];
using (var binaryReader = new BinaryReader(new MemoryStream(data)))
using (var binaryWriter = new BinaryWriter(new MemoryStream(buffer)))
{
while (binaryReader.BaseStream.Position < data.Length)
{
var normal = VertexFunctions.UnpackVectorInt(binaryReader.ReadInt32());
var tangent = VertexFunctions.UnpackVectorInt(binaryReader.ReadInt32());
var bitangent = VertexFunctions.UnpackVectorInt(binaryReader.ReadInt32());
binaryWriter.Write(normal);
binaryWriter.Write(tangent);
binaryWriter.Write(bitangent);
}
}
return(buffer);
default:
return(data);
}
}
private static VertexBuffer UnpackLightingData(ref VertexBuffer vertexBuffer)
{
var packedElementSize = vertexBuffer.Type.GetSize( );
var stride = Vector3.SizeInBytes * 3;
var count = vertexBuffer.Data.Length / packedElementSize;
var bufferLength = count * stride;
var buffer = new byte[bufferLength];
using (var binaryReader = new BinaryReader(new MemoryStream(vertexBuffer.Data)))
using (var binaryWriter = new BinaryWriter(new MemoryStream(buffer)))
{
while (binaryReader.BaseStream.Position < vertexBuffer.Data.Length)
{
var normal = VertexFunctions.UnpackVectorInt(binaryReader.ReadInt32( ));
var tangent = VertexFunctions.UnpackVectorInt(binaryReader.ReadInt32( ));
var bitangent = VertexFunctions.UnpackVectorInt(binaryReader.ReadInt32( ));
binaryWriter.Write(normal);
binaryWriter.Write(tangent);
binaryWriter.Write(bitangent);
}
}
return(new VertexBuffer
{
Data = buffer,
Type = VertexAttributeType.UnpackedLightingData
});
}