public static Unity3DTileIndex LoadFromGLTF(Stream stream)
{
using (var sr = new StreamReader(stream))
{
return(LoadRaw(GLTFFile.FromJson(sr.ReadToEnd()).DecodeIndex(out string mimeType), mimeType));
}
}
public static Unity3DTileIndex LoadFromGLTF(Stream stream, bool compressed)
{
using (var sr = new StreamReader(stream))
{
byte[] raw = GLTFFile.FromJson(sr.ReadToEnd()).DecodeIndex(out bool overrideCompressed);
return(LoadFromPPM(new MemoryStream(raw), compressed || overrideCompressed));
}
}
public static Unity3DTileIndex LoadFromGLB(Stream stream, bool compressed)
{
using (var br = new BinaryReader(stream)) //always reads little endian
{
var startPos = br.BaseStream.Position;
if (br.ReadByte() != 'g' || br.ReadByte() != 'l' || br.ReadByte() != 'T' || br.ReadByte() != 'F')
{
throw new Exception("invalid glb magic");
}
UInt32 ver = br.ReadUInt32();
if (ver != 2)
{
throw new Exception("invalid glb version: " + ver);
}
UInt32 len = br.ReadUInt32();
byte[] jsonChunk = null, binChunk = null;
while (br.BaseStream.Position - startPos < len)
{
UInt32 chunkLen = br.ReadUInt32();
if (chunkLen > int.MaxValue)
{
throw new Exception("unsupported glb chunk length: " + chunkLen);
}
string chunkType = Encoding.ASCII.GetString(br.ReadBytes(4));
switch (chunkType)
{
case "JSON":
{
if (jsonChunk != null)
{
throw new Exception("more than one JSON chunk in glb");
}
jsonChunk = br.ReadBytes((int)chunkLen);
break;
}
case "BIN\0":
{
if (binChunk != null)
{
throw new Exception("more than one BIN chunk in glb");
}
binChunk = br.ReadBytes((int)chunkLen);
break;
}
default: throw new Exception("invalid glb chunk type: " + chunkType);
}
}
var gltf = GLTFFile.FromJson(Encoding.ASCII.GetString(jsonChunk));
if (binChunk != null)
{
gltf.Data = binChunk;
}
byte[] raw = gltf.DecodeIndex(out bool overrideCompressed);
return(LoadFromPPM(new MemoryStream(raw), compressed || overrideCompressed));
}
}
