private static unsafe Byte[] Compress(Byte[] data, int width, int height, TeximpNet.Compression.Compressor ddsCompressor)
{
var dataHandle = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
var dataPtr = dataHandle.AddrOfPinnedObject();
var mipData = new TeximpNet.DDS.MipData(width, height, width * 4, dataPtr, false);
ddsCompressor.Input.SetMipmapData(mipData, true);
ddsCompressor.Output.OutputHeader = false;
if (ddsCompressor.Process(out var compressedImages))
{
var outData = compressedImages.MipChains[0][0];
var outSpan = new Span <Byte>((Byte *)outData.Data, outData.SizeInBytes);
return(outSpan.ToArray());
}
throw new Exception(ddsCompressor.LastErrorString);
}
finally
{
dataHandle.Free();
}
}
public static Byte[] CompressWithNvidia(this Bitmap srcImage, CompressionMode mode)
{
// System.Diagnostics.Debug.Assert(IntPtr.Size == 8, "nvtt.dll(x64) requires x64 runtime");
srcImage = srcImage.Clone();
srcImage.SwapElements(2, 1, 0, 3);
using (var ddsCompressor = new TeximpNet.Compression.Compressor())
{
var inputOptions = ddsCompressor.Input;
inputOptions.SetTextureLayout(TeximpNet.Compression.TextureType.Texture2D, srcImage.Width, srcImage.Height, 1);
inputOptions.SetMipmapGeneration(false);
inputOptions.SetGamma(1.0f, 1.0f);
inputOptions.AlphaMode = (mode & CompressionMode.Dxt1) == 0
? TeximpNet.Compression.AlphaMode.Premultiplied
: TeximpNet.Compression.AlphaMode.None;
var compressionOptions = ddsCompressor.Compression;
compressionOptions.Quality = TeximpNet.Compression.CompressionQuality.Normal;
if ((mode & CompressionMode.Dxt1) != 0)
{
compressionOptions.Format = TeximpNet.Compression.CompressionFormat.DXT1;
}
if ((mode & CompressionMode.Dxt3) != 0)
{
compressionOptions.Format = TeximpNet.Compression.CompressionFormat.DXT3;
}
if ((mode & CompressionMode.Dxt5) != 0)
{
compressionOptions.Format = TeximpNet.Compression.CompressionFormat.DXT5;
}
return(Compress(srcImage.Data, srcImage.Width, srcImage.Height, ddsCompressor));
}
}
