public bool ExtractUInt32(Stream stream, out UInt32 result)
{
const int UINT32_NO_OF_BYTES = 4;
byte[] chunk = new byte[UINT32_NO_OF_BYTES];
int bytesRead = stream.Read(chunk, 0, UINT32_NO_OF_BYTES);
if (bytesRead != UINT32_NO_OF_BYTES)
{
result = 0;
return(false);
}
if (Endianness == KTX_ENDIAN_REF_REV)
{
KTXHeader.SwapEndian32(chunk, UINT32_NO_OF_BYTES);
}
result = BitConverter.ToUInt32(chunk, 0);
return(true);
}
KTXError ExtractFace(
Stream src,
Stream dest,
KTXHeader header,
KTXMipmapData mipmap,
byte[] dataBuffer,
KTXFaceData[] faces
)
{
mipmap.Common.PixelWidth = Math.Max(1, header.PixelWidth >> mipmap.Common.Level);
mipmap.Common.PixelHeight = Math.Max(1, header.PixelHeight >> mipmap.Common.Level);
mipmap.Common.PixelDepth = Math.Max(1, header.PixelDepth >> mipmap.Common.Level);
for (int face = 0; face < header.NumberOfFaces; ++face)
{
var bytesRead = src.Read(dataBuffer, 0, mipmap.SizeRounded);
if (bytesRead != mipmap.SizeRounded)
{
return(KTXError.UnexpectedEndOfFile);
}
var bytesToRead = (int)mipmap.Common.Size;
/* Perform endianness conversion on texture data */
if (header.RequiresSwap() && header.GlTypeSize == 2)
{
KTXHeader.SwapEndian16(dataBuffer, bytesToRead);
}
else if (header.RequiresSwap() && header.GlTypeSize == 4)
{
KTXHeader.SwapEndian32(dataBuffer, bytesToRead);
}
mipmap.Common.NumberOfFaces = (int)header.NumberOfFaces;
mipmap.ViewType = header.Instructions.ViewType;
mipmap.Common.IsCompressed = header.Instructions.IsCompressed;
mipmap.Common.TextureDimensions = header.Instructions.TextureDimensions;
mipmap.Common.FaceIndex = face;
if (header.Instructions.TextureDimensions == 1)
{
}
else if (header.Instructions.TextureDimensions == 2)
{
if (header.NumberOfArrayElements > 0)
{
mipmap.Common.PixelHeight = header.NumberOfArrayElements;
}
}
else if (header.Instructions.TextureDimensions == 3)
{
if (header.NumberOfArrayElements > 0)
{
mipmap.Common.PixelDepth = header.NumberOfArrayElements;
}
}
faces[face].Mipmaps[mipmap.Common.Level] = new MgImageMipmap
{
// TODO : MAKE SURE IT DOES NOT "EXPLODE" LATER
Offset = (uint)dest.Position,
Width = mipmap.Common.PixelWidth,
Height = mipmap.Common.PixelHeight,
Size = mipmap.Common.Size,
};
dest.Write(dataBuffer, 0, bytesToRead);
// // Renderion is returning INVALID_VALUE. Oops!!
// if (mETCUnpacker.IsRequired (header.Instructions, mipmap.GLError))
//{
// var result = mETCUnpacker.UnpackCompressedTexture (
// header.Instructions,
// mipmap.Common.Level,
// face,
// mipmap.Common.PixelWidth,
// mipmap.Common.PixelHeight,
// mipmap.Common.Data);
// if (result != KTXError.Success)
// {
// return result;
// }
// mipmap.GLError = mPlatform.GetError ();
//}
}
return(KTXError.Success);
}