/// <summary>
/// Writes this ktx file into a stream.
/// </summary>
public void Write(Stream s)
{
if (MipMaps.Count < 1 || MipMaps[0].NumberOfFaces < 1)
{
throw new InvalidOperationException("The KTX structure should have at least 1 mipmap level and 1 Face before writing to file.");
}
using (BinaryWriter bw = new BinaryWriter(s, UTF8, true))
{
uint bytesOfKeyValueData = (uint)KeyValuePairs.Sum(x => x.GetSizeWithPadding());
Header.BytesOfKeyValueData = bytesOfKeyValueData;
Header.NumberOfFaces = MipMaps[0].NumberOfFaces;
Header.NumberOfMipmapLevels = (uint)MipMaps.Count;
Header.NumberOfArrayElements = 0;
if (!Header.VerifyHeader())
{
throw new InvalidOperationException("Please verify the header validity before writing to file.");
}
bw.WriteStruct(Header);
foreach (KtxKeyValuePair keyValuePair in KeyValuePairs)
{
KtxKeyValuePair.WriteKeyValuePair(bw, keyValuePair);
}
for (int mip = 0; mip < Header.NumberOfMipmapLevels; mip++)
{
uint imageSize = MipMaps[mip].SizeInBytes;
bw.Write(imageSize);
bool isCubemap = Header.NumberOfFaces == 6 && Header.NumberOfArrayElements == 0;
for (int f = 0; f < Header.NumberOfFaces; f++)
{
bw.Write(MipMaps[mip].Faces[f].Data);
uint cubePadding = 0u;
if (isCubemap)
{
cubePadding = 3 - ((imageSize + 3) % 4);
}
bw.AddPadding(cubePadding);
}
uint mipPaddingBytes = 3 - ((imageSize + 3) % 4);
bw.AddPadding(mipPaddingBytes);
}
}
}
