public static void SaveTextureAsBlp(BlpCompression compression, Texture texture, string fileName)
{
Format surfaceFormat = Format.Unknown;
int blockSize = 0;
texture.GenerateMipSublevels();
BlpHeader header = new BlpHeader();
header.Version = 1;
header.AlphaDepth = 8;
header.Offsets = new int[16];
header.Sizes = new int[16];
header.Compression = 2;
switch (compression)
{
case BlpCompression.Dxt1:
header.AlphaEncoding = 0;
surfaceFormat = Format.Dxt1;
blockSize = 2;
break;
case BlpCompression.Dxt3:
header.AlphaEncoding = 1;
surfaceFormat = Format.Dxt3;
blockSize = 4;
break;
case BlpCompression.Dxt5:
header.AlphaEncoding = 7;
surfaceFormat = Format.Dxt5;
blockSize = 4;
break;
}
header.HasMipMap = (texture.LevelCount > 1) ? (byte)1 : (byte)0;
header.Width = texture.GetLevelDescription(0).Width;
header.Height = texture.GetLevelDescription(0).Height;
header.Signature = 0x32504C42;
System.IO.Stream strm = System.IO.File.OpenWrite(fileName);
using (System.IO.BinaryWriter bw = new System.IO.BinaryWriter(strm))
{
bw.WriteStruct(header);
for (int i = 0; i < 16; ++i)
{
if (i >= texture.LevelCount)
{
header.Offsets[i] = 0;
header.Sizes[i] = 0;
continue;
}
var desc = texture.GetLevelDescription(i);
Texture tmpTexture = new Texture(texture.Device, desc.Width, desc.Height, 1, Usage.None, surfaceFormat, Pool.Managed);
var dstSurface = tmpTexture.GetSurfaceLevel(0);
Surface.FromSurface(dstSurface, texture.GetSurfaceLevel(i), Filter.Point, 0);
var rect = dstSurface.LockRectangle(LockFlags.None);
var size = blockSize * desc.Width * desc.Height;
byte[] buffer = new byte[size];
header.Offsets[i] = (int)bw.BaseStream.Position;
header.Sizes[i] = size;
rect.Data.Read(buffer, 0, size);
bw.Write(buffer);
dstSurface.Dispose();
tmpTexture.Dispose();
}
bw.BaseStream.Position = 0;
bw.WriteStruct(header);
}
}
