// https://msdn.microsoft.com/en-us/library/windows/desktop/bb173059.aspx "DXGI_FORMAT enumeration"
// https://msdn.microsoft.com/en-us/library/windows/desktop/cc308051.aspx "Legacy Formats: Map Direct3D 9 Formats to Direct3D 10"
private static Squish.DDS.PixelFormat GetPixelFormat(TextureDX10ArchiveFile.Entry entry)
{
switch (entry.Format)
{
case 71: // DXGI_FORMAT_BC1_UNORM
{
var pixelFormat = new Squish.DDS.PixelFormat();
pixelFormat.Initialise(Squish.DDS.FileFormat.DXT1);
return(pixelFormat);
}
case 74: // DXGI_FORMAT_BC2_UNORM
{
var pixelFormat = new Squish.DDS.PixelFormat();
pixelFormat.Initialise(Squish.DDS.FileFormat.DXT3);
return(pixelFormat);
}
case 77: // DXGI_FORMAT_BC3_UNORM
{
var pixelFormat = new Squish.DDS.PixelFormat();
pixelFormat.Initialise(Squish.DDS.FileFormat.DXT5);
return(pixelFormat);
}
case 87: // DXGI_FORMAT_B8G8R8A8_UNORM
{
var pixelFormat = new Squish.DDS.PixelFormat();
pixelFormat.Initialise(Squish.DDS.FileFormat.A8R8G8B8);
return(pixelFormat);
}
case 61: // DXGI_FORMAT_R8_UNORM
case 83: // DXGI_FORMAT_BC5_UNORM
case 98: // DXGI_FORMAT_BC7_UNORM
{
var pixelFormat = new Squish.DDS.PixelFormat();
pixelFormat.Size = pixelFormat.GetSize();
pixelFormat.FourCC = 0x30315844; // 'DX10'
return(pixelFormat);
}
}
throw new NotSupportedException();
}
private static void ConvertTexture(Stream input, TextureDX10ArchiveFile.Entry entry, Stream output)
{
const Endian endian = Endian.Little;
var header = new Squish.DDS.Header();
header.Size = header.GetSize();
header.Flags = Squish.DDS.HeaderFlags.Texture | Squish.DDS.HeaderFlags.Mipmap;
header.Width = entry.Width;
header.Height = entry.Height;
header.PitchOrLinearSize = 0;
header.Depth = 0;
header.MipMapCount = entry.MipMapCount;
header.PixelFormat = GetPixelFormat(entry);
header.SurfaceFlags = 8;
header.CubemapFlags = 0;
output.WriteValueU32(0x20534444, endian);
header.Serialize(output, endian);
if (header.PixelFormat.FourCC == 0x30315844)
{
output.WriteValueU32(entry.Format, endian);
output.WriteValueU32(2, endian);
output.WriteValueU32(0, endian);
output.WriteValueU32(1, endian);
output.WriteValueU32(0, endian);
}
foreach (var mipMap in entry.MipMaps)
{
if (mipMap.DataCompressedSize == 0)
{
input.Seek(mipMap.DataOffset, SeekOrigin.Begin);
output.WriteFromStream(input, mipMap.DataUncompressedSize);
}
else
{
input.Seek(mipMap.DataOffset, SeekOrigin.Begin);
var zlib = new InflaterInputStream(input);
output.WriteFromStream(zlib, mipMap.DataUncompressedSize);
}
}
}
