public static byte[] CreateHeader(LahdTexture tex)
{
int bpp;
uint flags = 0;
string fourCC;
int dxgiFormat = 0;
switch (tex.Format)
{
case TextureFormat.BC1:
bpp = 4;
flags |= 4;
fourCC = "DXT1";
break;
case TextureFormat.BC3:
bpp = 8;
flags |= 4;
fourCC = "DXT5";
break;
case TextureFormat.BC4:
bpp = 8;
flags |= 4;
fourCC = "DX10";
dxgiFormat = 80;
break;
case TextureFormat.BC7:
bpp = 8;
flags |= 4;
fourCC = "DX10";
dxgiFormat = 98;
break;
case TextureFormat.BC6H_UF16:
bpp = 4;
flags |= 4;
fourCC = "DX10";
dxgiFormat = 95;
break;
default:
throw new ArgumentOutOfRangeException();
}
int size = tex.Height * tex.Width * bpp / 8;
var writer = new BinaryWriter(new MemoryStream());
writer.Write(Encoding.ASCII.GetBytes("DDS "));
writer.Write(124);
uint dwFlags = 1 | 2 | 4 | 0x1000;
dwFlags |= 0x80000;
writer.Write(dwFlags);
writer.Write(tex.Height);
writer.Write(tex.Width);
writer.Write(size);
writer.Write(0);
writer.Write(0);
writer.Seek(44, SeekOrigin.Current);
writer.Write(32);
writer.Write(flags);
writer.Write(Encoding.ASCII.GetBytes(fourCC));
writer.Seek(20, SeekOrigin.Current);
writer.Write(0x1000);
writer.Seek(16, SeekOrigin.Current);
if (fourCC == "DX10")
{
writer.Write(dxgiFormat);
writer.Write(3);
writer.Write(0);
writer.Write(1);
writer.Write(0);
}
writer.BaseStream.SetLength(writer.BaseStream.Position);
return(((MemoryStream)writer.BaseStream).ToArray());
}
