/// <summary>
/// Write a universal compression header
/// </summary>
/// <param name="bitstream"></param>
/// <param name="data"></param>
/// <param name="headerFlags"></param>
public static void WriteUniversalHeader(Bitstream bitstream, Datastream data, HeaderFlags headerFlags)
{
if (headerFlags.HasFlag(HeaderFlags.SymbolCount))
{
UniversalCodec.Lomont.EncodeLomont1(bitstream, (uint)data.Count, 6, 0);
}
if (headerFlags.HasFlag(HeaderFlags.BitsPerSymbol))
{
var max = data.Any() ? data.Max() : 0;
var bitsPerSymbol = CodecBase.BitsRequired(max);
UniversalCodec.Lomont.EncodeLomont1(bitstream, bitsPerSymbol - 1, 3, 0);
}
}
/// <summary>
/// Read a universal compression header
/// Returns (symbol count, bits per symbol)
/// </summary>
/// <param name="bitstream"></param>
/// <param name="headerFlags"></param>
public static Tuple <uint, uint> ReadUniversalHeader(Bitstream bitstream, HeaderFlags headerFlags)
{
uint decompressedSymbolCount = 0;
uint bitsPerSymbol = 0;
if (headerFlags.HasFlag(HeaderFlags.SymbolCount))
{
decompressedSymbolCount = UniversalCodec.Lomont.DecodeLomont1(bitstream, 6, 0);
}
if (headerFlags.HasFlag(HeaderFlags.BitsPerSymbol))
{
bitsPerSymbol = UniversalCodec.Lomont.DecodeLomont1(bitstream, 3, 0) + 1;
}
return(new Tuple <uint, uint>(decompressedSymbolCount, bitsPerSymbol));
}
public static void Save(BinaryWriter bw, DDS dds)
{
HeaderFlags flags = HeaderFlags.Caps | HeaderFlags.Height | HeaderFlags.Width | HeaderFlags.PixelFormat | HeaderFlags.MipMapCount;
flags |= dds.Format == D3DFormat.A8R8G8B8 ? HeaderFlags.Pitch : HeaderFlags.LinearSize;
bw.Write(new byte[] { 0x44, 0x44, 0x53, 0x20 }); // 'DDS '
bw.Write(124);
bw.Write((int)flags);
bw.Write(dds.Height);
bw.Write(dds.Width);
bw.Write(flags.HasFlag(HeaderFlags.Pitch) ? dds.Width * 4 : dds.MipMaps[0].Data.Length);
bw.Write(dds.Depth);
bw.Write(dds.MipMaps.Count);
for (int i = 0; i < 11; i++)
{
bw.Write(0);
}
// PixelFormat
bw.Write(32);
switch (dds.Format)
{
case D3DFormat.DXT1:
case D3DFormat.DXT3:
case D3DFormat.DXT5:
bw.Write(4); // fourCC length
bw.Write(dds.Format.ToString().ToCharArray());
bw.Write(0);
bw.Write(0);
bw.Write(0);
bw.Write(0);
bw.Write(0);
break;
default:
bw.Write(0); // fourCC length
bw.Write(0);
bw.Write(32); // RGB bit count
bw.Write(255 << 16); // R mask
bw.Write(255 << 8); // G mask
bw.Write(255 << 0); // B mask
bw.Write(255 << 24); // A mask
break;
}
bw.Write((int)DDSCaps.DDSCAPS_TEXTURE);
bw.Write(0); // Caps 2
bw.Write(0); // Caps 3
bw.Write(0); // Caps 4
bw.Write(0); // Reserved
for (int i = 0; i < dds.MipMaps.Count; i++)
{
bw.Write(dds.MipMaps[i].Data);
}
}
private static bool ValidateTexture(HeaderDXT10 header, HeaderFlags flags, out int depth, out PixelFormat format, out ResourceDimension resDim, out int arraySize, out bool isCubeMap)
{
depth = 0;
format = Renderer.PixelFormat.Unknown;
resDim = ResourceDimension.Unknown;
arraySize = 0x1;
isCubeMap = false;
arraySize = header.ArraySize;
if (arraySize == 0)
{
return(false);
}
if (header.MiscFlag2 != FlagsDX10.AlphaModeUnknown)
{
return(false);
}
if (DDSPixelFormat.BitsPerPixel(header.DXGIFormat) == 0)
{
return(false);
}
format = header.DXGIFormat;
switch (header.Dimension)
{
case ResourceDimension.Texture1D:
depth = 1;
break;
case ResourceDimension.Texture2D:
if (header.MiscFlag.HasFlag(ResourceOptionFlags.TextureCube))
{
arraySize *= 6;
isCubeMap = true;
}
depth = 1;
break;
case ResourceDimension.Texture3D:
if (!flags.HasFlag(HeaderFlags.Depth))
{
return(false);
}
if (arraySize > 1)
{
return(false);
}
break;
default:
return(false);
}
resDim = header.Dimension;
return(true);
}
