private static void ExportR16ToDDS(BinaryReader sourceReader, Stream destination, DDSContainerParameters @params)
{
DDSContainerParameters bgraParams = new DDSContainerParameters();
@params.CopyTo(bgraParams);
bgraParams.RGBBitCount = 32;
bgraParams.RBitMask = 0xFF0000;
bgraParams.GBitMask = 0xFF00;
bgraParams.BBitMask = 0xFF;
bgraParams.ABitMask = 0xFF000000;
ExportDDSHeader(destination, bgraParams);
long pixelCount = @params.BitMapDepth * @params.Height * @params.Width;
for (int i = 0; i < pixelCount; i++)
{
ushort pixel = sourceReader.ReadUInt16();
float f = Half.ToHalf(pixel);
byte R = (byte)Math.Ceiling(f * 255.0);
destination.WriteByte(0); // B
destination.WriteByte(0); // G
destination.WriteByte(R); // R
destination.WriteByte(0xFF); // A
}
}
public static void ExportDDS(Stream source, Stream destination, DDSContainerParameters @params)
{
using (BinaryReader sourceReader = new BinaryReader(source))
{
ExportDDS(sourceReader, destination, @params);
}
}
public static void ExportDDSHeader(Stream destination, DDSContainerParameters @params)
{
using (BinaryWriter binWriter = new BinaryWriter(destination, Encoding.UTF8, true))
{
binWriter.Write(MagicNumber);
binWriter.Write(HeaderSize);
binWriter.Write((uint)@params.DFlags);
binWriter.Write(@params.Height);
binWriter.Write(@params.Width);
binWriter.Write(@params.PitchOrLinearSize);
binWriter.Write(@params.Depth);
binWriter.Write(@params.MipMapCount);
// read alphabitdepth?
for (int i = 0; i < 11; i++) // reserved
{
binWriter.Write(0);
}
DDSPixelFormat pixelFormat = new DDSPixelFormat()
{
Flags = @params.PixelFormatFlags,
FourCC = @params.FourCC,
RGBBitCount = @params.RGBBitCount,
RBitMask = @params.RBitMask,
GBitMask = @params.GBitMask,
BBitMask = @params.BBitMask,
ABitMask = @params.ABitMask,
};
pixelFormat.Write(binWriter);
binWriter.Write((uint)@params.Caps);
binWriter.Write((uint)Caps2);
binWriter.Write(0); // caps3
binWriter.Write(0); // caps4
binWriter.Write(0); // reserved (texturestage?)
}
}
private static void ExportARGB32ToDDS(BinaryReader sourceReader, Stream destination, DDSContainerParameters @params)
{
DDSContainerParameters bgraParams = new DDSContainerParameters();
@params.CopyTo(bgraParams);
bgraParams.RBitMask = 0xFF0000;
bgraParams.GBitMask = 0xFF00;
bgraParams.BBitMask = 0xFF;
bgraParams.ABitMask = 0xFF000000;
ExportDDSHeader(destination, bgraParams);
long pixelCount = @params.BitMapDepth * @params.Height * @params.Width;
for (int i = 0; i < pixelCount; i++)
{
byte A = sourceReader.ReadByte();
byte R = sourceReader.ReadByte();
byte G = sourceReader.ReadByte();
byte B = sourceReader.ReadByte();
destination.WriteByte(B); // B
destination.WriteByte(G); // G
destination.WriteByte(R); // R
destination.WriteByte(A); // A
}
}
public static void ExportDDSHeader(byte[] buffer, int offset, DDSContainerParameters @params)
{
using (MemoryStream stream = new MemoryStream(buffer))
{
stream.Position = offset;
ExportDDSHeader(stream, @params);
}
}
public static void ExportDDS(BinaryReader sourceReader, Stream destination, DDSContainerParameters @params)
{
if (IsRGBA32(@params))
{
ExportRGBA32ToDDS(sourceReader, destination, @params);
}
else if (IsARGB32(@params))
{
ExportARGB32ToDDS(sourceReader, destination, @params);
}
else if (IsRGBA16(@params))
{
ExportRGBA16ToDDS(sourceReader, destination, @params);
}
else if (IsAlpha8(@params))
{
ExportAlpha8ToDDS(sourceReader, destination, @params);
}
else if (IsR8(@params))
{
ExportR8ToDDS(sourceReader, destination, @params);
}
else if (IsR16(@params))
{
ExportR16ToDDS(sourceReader, destination, @params);
}
else if (IsRG16(@params))
{
ExportRG16ToDDS(sourceReader, destination, @params);
}
else
{
ExportDDSHeader(destination, @params);
for (int i = 0; i < @params.DataLength; i += 2)
{
ushort value = sourceReader.ReadUInt16();
byte value0 = unchecked ((byte)(value >> 0));
byte value1 = unchecked ((byte)(value >> 8));
destination.WriteByte(value0);
destination.WriteByte(value1);
}
}
}
private static void ExportRGBA16ToDDS(BinaryReader sourceReader, Stream destination, DDSContainerParameters @params)
{
DDSContainerParameters bgraParams = new DDSContainerParameters();
@params.CopyTo(bgraParams);
bgraParams.RBitMask = 0xF00;
bgraParams.BBitMask = 0xF;
ExportDDSHeader(destination, bgraParams);
long pixelCount = @params.BitMapDepth * @params.Height * @params.Width;
for (int i = 0; i < pixelCount; i++)
{
int pixel = sourceReader.ReadUInt16();
int c1 = (0x00F0 & pixel) >> 4; // B
int c2 = (0x0F00 & pixel) >> 4; // G
destination.WriteByte((byte)(c1 | c2));
c1 = (0xF000 & pixel) >> 12; // R
c2 = (0x000F & pixel) << 4; // A
destination.WriteByte((byte)(c1 | c2));
}
}
private static bool IsRG16(DDSContainerParameters @params)
{
return(@params.RBitMask == 0xFF && @params.GBitMask == 0xFF00 && @params.BBitMask == 0 && @params.ABitMask == 0);
}
private static bool IsAlpha8(DDSContainerParameters @params)
{
return(@params.RBitMask == 0 && @params.GBitMask == 0 && @params.BBitMask == 0 && @params.ABitMask == 0xFF);
}
