private KTXError ReadHeader(byte[] headerChunk, out KTXHeader header)
{
KTXError errorCode = KTXError.Success;
header = new KTXHeader();
header.Populate(headerChunk);
if (header.Instructions.Result != KTXError.Success)
{
return(header.Instructions.Result);
}
header.KeyValueData = new byte[header.BytesOfKeyValueData];
if (header.KeyValueData == null)
{
return(KTXError.OutOfMemory);
}
return(errorCode);
}
KTXTextureOutput LoadTexture(
Stream src,
KTXHeader header)
{
// default out values
KTXError errorCode = KTXError.Success;
bool isFirstTime = true;
int previousLodSize = 0;
byte[] data = null;
var faces = new KTXFaceData[header.NumberOfFaces];
for (var i = 0; i < faces.Length; ++i)
{
faces[i] = new KTXFaceData((uint)i, header.NumberOfMipmapLevels);
}
using (var dest = new MemoryStream())
{
for (int level = 0; level < header.NumberOfMipmapLevels; ++level)
{
UInt32 faceLodSize;
if (!header.ExtractUInt32(src, out faceLodSize))
{
errorCode = KTXError.InvalidOperation;
break;
}
int faceLodSizeRounded = ((int)faceLodSize + 3) & ~3;
// array texture is this correct ?
if (isFirstTime)
{
isFirstTime = false;
previousLodSize = faceLodSizeRounded;
/* allocate memory sufficient for the first level */
data = new byte[faceLodSizeRounded];
if (data == null)
{
errorCode = KTXError.OutOfMemory;
break;
}
}
else
{
if (previousLodSize < faceLodSizeRounded)
{
/* subsequent levels cannot be larger than the first level */
errorCode = KTXError.InvalidValue;
break;
}
}
var mipmap = new KTXMipmapData();
mipmap.Common.Level = level;
mipmap.Common.Data = data;
mipmap.Common.Size = faceLodSize;
mipmap.SizeRounded = faceLodSizeRounded;
var loadError = ExtractFace(src, dest, header, mipmap, data, faces);
if (loadError != KTXError.Success)
{
errorCode = loadError;
break;
}
}
var format = DetermineFormat(header.GlType, header.GlFormat, header.GlInternalFormat);
// MgImageOptimizer takes
// 1. byte array
// 2. image source
var output = new KTXTextureOutput();
// one face at a time
var face = faces[0];
output.Source = new MgImageSource
{
Format = format,
Height = header.PixelHeight,
Width = header.PixelWidth,
Mipmaps = face.Mipmaps,
Size = (uint)dest.Length,
};
output.TextureInfo = mTextureOptimizer.Load(dest.ToArray(), output.Source, null, null);
// QUEUE WAIT ON
var err = mGraphicsConfiguration.Queue.QueueWaitIdle();
Debug.Assert(err == Result.SUCCESS);
mGraphicsConfiguration.Device.FreeCommandBuffers(
mGraphicsConfiguration.Partition.CommandPool,
new[] { output.TextureInfo.Command });
return(output);
}
}