public static void ExportDDSHeader(Stream destination, DDSConvertParameters @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 ExportR16ToDDS(BinaryReader sourceReader, Stream destination, DDSConvertParameters @params)
{
DDSConvertParameters bgraParams = new DDSConvertParameters();
@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, DDSConvertParameters @params)
{
using (BinaryReader sourceReader = new BinaryReader(source))
{
ExportDDS(sourceReader, destination, @params);
}
}
public static void DecompressRGB(Stream source, Stream destination, DDSConvertParameters @params)
{
using (BinaryReader reader = new BinaryReader(source))
{
DecompressRGBA(reader, destination, @params, false);
}
}
public static void DecompressDXT1(Stream source, Stream destination, DDSConvertParameters @params)
{
using (BinaryReader sourceReader = new BinaryReader(source))
{
DecompressDXT1(sourceReader, destination, @params);
}
}
private static void ExportARGB32ToDDS(BinaryReader sourceReader, Stream destination, DDSConvertParameters @params)
{
DDSConvertParameters bgraParams = new DDSConvertParameters();
@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, DDSConvertParameters @params)
{
using (MemoryStream stream = new MemoryStream(buffer))
{
stream.Position = offset;
ExportDDSHeader(stream, @params);
}
}
public static long GetDecompressedSize(DDSConvertParameters @params)
{
int width = @params.Width;
int height = @params.Height;
int depth = @params.BitMapDepth;
int bpp = GetRGBABytesPerPixel(@params);
int bpc = GetBytesPerColor(@params);
int bps = width * bpp * bpc;
long sizeOfPlane = bps * height;
return(depth * sizeOfPlane + height * bps + width * bpp);
}
private static int GetBytesPerPixel(DDSConvertParameters @params)
{
if (@params.PixelFormatFlags.IsFourCC())
{
switch (@params.FourCC)
{
case DDSFourCCType.DXT1:
case DDSFourCCType.DXT2:
case DDSFourCCType.DXT3:
case DDSFourCCType.DXT4:
case DDSFourCCType.DXT5:
return(4);
case DDSFourCCType.ATI1:
return(1);
case DDSFourCCType.ATI2:
case DDSFourCCType.RXGB:
return(3);
case DDSFourCCType.oNULL:
return(2);
case DDSFourCCType.DollarNULL:
case DDSFourCCType.qNULL:
case DDSFourCCType.sNULL:
return(8);
case DDSFourCCType.tNULL:
return(16);
case DDSFourCCType.pNULL:
case DDSFourCCType.rNULL:
return(4);
default:
throw new Exception($"Unsupported CCType {@params.FourCC}");
}
}
else
{
return(@params.RGBBitCount / 8);
}
}
public static void ExportDDS(BinaryReader sourceReader, Stream destination, DDSConvertParameters @params)
{
if (IsRGBA32(@params))
{
ExportRGBA32ToDDS(sourceReader, destination, @params);
}
else if (IsARGB32(@params))
{
ExportARGB32ToDDS(sourceReader, destination, @params);
}
else if (IsRGBA16(@params))
{
ExportRGBA16ToDDS(sourceReader, destination, @params);
}
else if (IsAlpha8(@params))
{
ExportAlpha8ToDDS(sourceReader, destination, @params);
}
else if (IsR8(@params))
{
ExportR8ToDDS(sourceReader, destination, @params);
}
else if (IsR16(@params))
{
ExportR16ToDDS(sourceReader, destination, @params);
}
else if (IsRG16(@params))
{
ExportRG16ToDDS(sourceReader, destination, @params);
}
else
{
ExportDDSHeader(destination, @params);
for (int i = 0; i < @params.DataLength; i += 2)
{
ushort value = sourceReader.ReadUInt16();
byte value0 = unchecked ((byte)(value >> 0));
byte value1 = unchecked ((byte)(value >> 8));
destination.WriteByte(value0);
destination.WriteByte(value1);
}
}
}
private static int GetRGBABytesPerPixel(DDSConvertParameters @params)
{
if (@params.PixelFormatFlags.IsFourCC())
{
switch (@params.FourCC)
{
case DDSFourCCType.DXT1:
case DDSFourCCType.DXT2:
case DDSFourCCType.DXT3:
case DDSFourCCType.DXT4:
case DDSFourCCType.DXT5:
return(4);
default:
throw new Exception($"Unsupported CCType {@params.FourCC}");
}
}
else
{
return(4);
}
}
private static void ExportRGBA16ToDDS(BinaryReader sourceReader, Stream destination, DDSConvertParameters @params)
{
DDSConvertParameters bgraParams = new DDSConvertParameters();
@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));
}
}
public static void DecompressDXT5(BinaryReader sourceReader, Stream destination, DDSConvertParameters @params)
{
int depth = @params.BitMapDepth;
int width = @params.Width;
int height = @params.Height;
int bpp = GetRGBABytesPerPixel(@params);
int bpc = GetBytesPerColor(@params);
int bps = width * bpp * bpc;
long sizeOfPlane = bps * height;
Color8888[] colors = new Color8888[4];
ushort[] alphas = new ushort[8];
byte[] alphaMask = new byte[6];
long position = destination.Position;
for (int z = 0; z < depth; z++)
{
// mirror Y
for (int y = height - 1; y >= 0; y -= 4)
{
for (int x = 0; x < width; x += 4)
{
ushort alpha = sourceReader.ReadUInt16();
alphas[0] = unchecked ((byte)(alpha >> 0));
alphas[1] = unchecked ((byte)(alpha >> 8));
ushort alphaMask0 = sourceReader.ReadUInt16();
ushort alphaMask1 = sourceReader.ReadUInt16();
ushort alphaMask2 = sourceReader.ReadUInt16();
alphaMask[0] = unchecked ((byte)(alphaMask0 >> 0));
alphaMask[1] = unchecked ((byte)(alphaMask0 >> 8));
alphaMask[2] = unchecked ((byte)(alphaMask1 >> 0));
alphaMask[3] = unchecked ((byte)(alphaMask1 >> 8));
alphaMask[4] = unchecked ((byte)(alphaMask2 >> 0));
alphaMask[5] = unchecked ((byte)(alphaMask2 >> 8));
colors[0] = DxtcRead2bColor(sourceReader);
colors[1] = DxtcRead2bColor(sourceReader);
uint bitMask0 = sourceReader.ReadUInt16();
uint bitMask1 = sourceReader.ReadUInt16();
uint bitMask = (bitMask0 << 0) | (bitMask1 << 16);
// Four-color block: derive the other two colors.
// 00 = color_0, 01 = color_1, 10 = color_2, 11 = color_3
// These 2-bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
colors[2].Blue = unchecked ((byte)((2 * colors[0].Blue + colors[1].Blue + 1) / 3));
colors[2].Green = unchecked ((byte)((2 * colors[0].Green + colors[1].Green + 1) / 3));
colors[2].Red = unchecked ((byte)((2 * colors[0].Red + colors[1].Red + 1) / 3));
colors[3].Blue = unchecked ((byte)((colors[0].Blue + 2 * colors[1].Blue + 1) / 3));
colors[3].Green = unchecked ((byte)((colors[0].Green + 2 * colors[1].Green + 1) / 3));
colors[3].Red = unchecked ((byte)((colors[0].Red + 2 * colors[1].Red + 1) / 3));
int bitIndex = 0;
for (int ly = 0; ly < 4; ly++)
{
for (int lx = 0; lx < 4; lx++, bitIndex++)
{
int colorIndex = (int)((bitMask & (0x03 << bitIndex * 2)) >> bitIndex * 2);
Color8888 col = colors[colorIndex];
// only put pixels out < width or height
if ((x + lx) < width && (y - ly) < height && (y - ly) >= 0)
{
// mirror Y
long offset = z * sizeOfPlane + (y - ly) * bps + (x + lx) * bpp;
destination.Position = position + offset;
destination.WriteByte(col.Red);
destination.WriteByte(col.Green);
destination.WriteByte(col.Blue);
}
}
}
// 8-alpha or 6-alpha block?
if (alphas[0] > alphas[1])
{
// 8-alpha block: derive the other six alphas.
// Bit code 000 = alpha_0, 001 = alpha_1, others are interpolated.
alphas[2] = unchecked ((ushort)((6 * alphas[0] + 1 * alphas[1] + 3) / 7)); // bit code 010
alphas[3] = unchecked ((ushort)((5 * alphas[0] + 2 * alphas[1] + 3) / 7)); // bit code 011
alphas[4] = unchecked ((ushort)((4 * alphas[0] + 3 * alphas[1] + 3) / 7)); // bit code 100
alphas[5] = unchecked ((ushort)((3 * alphas[0] + 4 * alphas[1] + 3) / 7)); // bit code 101
alphas[6] = unchecked ((ushort)((2 * alphas[0] + 5 * alphas[1] + 3) / 7)); // bit code 110
alphas[7] = unchecked ((ushort)((1 * alphas[0] + 6 * alphas[1] + 3) / 7)); // bit code 111
}
else
{
// 6-alpha block.
// Bit code 000 = alpha_0, 001 = alpha_1, others are interpolated.
alphas[2] = unchecked ((ushort)((4 * alphas[0] + 1 * alphas[1] + 2) / 5)); // Bit code 010
alphas[3] = unchecked ((ushort)((3 * alphas[0] + 2 * alphas[1] + 2) / 5)); // Bit code 011
alphas[4] = unchecked ((ushort)((2 * alphas[0] + 3 * alphas[1] + 2) / 5)); // Bit code 100
alphas[5] = unchecked ((ushort)((1 * alphas[0] + 4 * alphas[1] + 2) / 5)); // Bit code 101
alphas[6] = 0x00; // Bit code 110
alphas[7] = 0xFF; // Bit code 111
}
// Note: Have to separate the next two loops,
// it operates on a 6-byte system.
// First three bytes
//uint bits = (uint)(alphamask[0]);
uint bits = unchecked ((uint)((alphaMask[0]) | (alphaMask[1] << 8) | (alphaMask[2] << 16)));
for (int ly = 0; ly < 2; ly++)
{
for (int lx = 0; lx < 4; lx++, bits >>= 3)
{
// only put pixels out < width or height
if ((x + lx) < width && (y - ly) < height && (y - ly) >= 0)
{
byte alphaValue = unchecked ((byte)alphas[bits & 0x07]);
// mirror Y
long offset = z * sizeOfPlane + (y - ly) * bps + (x + lx) * bpp + 3;
destination.Position = position + offset;
destination.WriteByte(alphaValue);
}
}
}
// Last three bytes
//bits = (uint)(alphamask[3]);
bits = unchecked ((uint)((alphaMask[3]) | (alphaMask[4] << 8) | (alphaMask[5] << 16)));
for (int ly = 2; ly < 4; ly++)
{
for (int lx = 0; lx < 4; lx++, bits >>= 3)
{
// only put pixels out < width or height
if ((x + lx) < width && (y - ly) < height && (y - ly) >= 0)
{
byte alphaValue = unchecked ((byte)alphas[bits & 0x07]);
// mirror Y
long offset = z * sizeOfPlane + (y - ly) * bps + (x + lx) * bpp + 3;
destination.Position = position + offset;
destination.WriteByte(alphaValue);
}
}
}
}
}
}
}
public static void DecompressRGBA(BinaryReader sourceReader, Stream destination, DDSConvertParameters @params)
{
DecompressRGBA(sourceReader, destination, @params, true);
}
private static bool IsRG16(DDSConvertParameters @params)
{
return(@params.RBitMask == 0xFF && @params.GBitMask == 0xFF00 && @params.BBitMask == 0 && @params.ABitMask == 0);
}
private static bool IsAlpha8(DDSConvertParameters @params)
{
return(@params.RBitMask == 0 && @params.GBitMask == 0 && @params.BBitMask == 0 && @params.ABitMask == 0xFF);
}
private static void DecompressRGBA(BinaryReader sourceReader, Stream destination, DDSConvertParameters @params, bool isAlpha)
{
int depth = @params.BitMapDepth;
int width = @params.Width;
int height = @params.Height;
int bpp = GetRGBABytesPerPixel(@params);
int bpc = GetBytesPerColor(@params);
int bps = width * bpp * bpc;
long sizeOfPlane = bps * height;
int pixelSize = (@params.RGBBitCount + 7) / 8;
ColorMask rMask = ComputeMaskParams(@params.RBitMask);
ColorMask gMask = ComputeMaskParams(@params.GBitMask);
ColorMask bMask = ComputeMaskParams(@params.BBitMask);
ColorMask aMask = ComputeMaskParams(@params.ABitMask);
long position = destination.Position;
for (int z = 0; z < depth; z++)
{
// mirror Y
for (int j = height - 1; j >= 0; j--)
{
long offset = z * sizeOfPlane + j * bps;
destination.Position = position + offset;
for (int i = 0; i < width; i++)
{
uint pixel = ReadPixel(sourceReader, pixelSize);
uint pixelColor = pixel & @params.RBitMask;
byte red = unchecked ((byte)(((pixelColor >> rMask.Shift1) * rMask.Mult) >> rMask.Shift2));
pixelColor = pixel & @params.GBitMask;
byte green = unchecked ((byte)(((pixelColor >> gMask.Shift1) * gMask.Mult) >> gMask.Shift2));
pixelColor = pixel & @params.BBitMask;
byte blue = unchecked ((byte)(((pixelColor >> bMask.Shift1) * bMask.Mult) >> bMask.Shift2));
byte alpha = 0xFF;
if (isAlpha)
{
pixelColor = pixel & @params.ABitMask;
alpha = unchecked ((byte)(((pixelColor >> aMask.Shift1) * aMask.Mult) >> aMask.Shift2));
}
destination.WriteByte(blue);
destination.WriteByte(green);
destination.WriteByte(red);
destination.WriteByte(alpha);
}
}
}
}
public static void DecompressDXT1(BinaryReader sourceReader, Stream destination, DDSConvertParameters @params)
{
int depth = @params.BitMapDepth;
int width = @params.Width;
int height = @params.Height;
int bpp = GetRGBABytesPerPixel(@params);
int bpc = GetBytesPerColor(@params);
int bps = width * bpp * bpc;
long sizeOfPlane = bps * height;
Color8888[] colors = new Color8888[4];
long position = destination.Position;
for (int z = 0; z < depth; z++)
{
// mirror Y
for (int y = height - 1; y >= 0; y -= 4)
{
for (int x = 0; x < width; x += 4)
{
ushort color0 = sourceReader.ReadUInt16();
ushort color1 = sourceReader.ReadUInt16();
uint bitMask0 = sourceReader.ReadUInt16();
uint bitMask1 = sourceReader.ReadUInt16();
uint bitMask = (bitMask0 << 0) | (bitMask1 << 16);
colors[0] = DxtcRead3bColor(color0);
colors[1] = DxtcRead3bColor(color1);
if (color0 > color1)
{
// Four-color block: derive the other two colors.
// 00 = color_0, 01 = color_1, 10 = color_2, 11 = color_3
// These 2-bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
colors[2].Blue = unchecked ((byte)((2 * colors[0].Blue + colors[1].Blue + 1) / 3));
colors[2].Green = unchecked ((byte)((2 * colors[0].Green + colors[1].Green + 1) / 3));
colors[2].Red = unchecked ((byte)((2 * colors[0].Red + colors[1].Red + 1) / 3));
colors[2].Alpha = 0xFF;
colors[3].Alpha = 0xFF;
}
else
{
// Three-color block: derive the other color.
// 00 = color_0, 01 = color_1, 10 = color_2,
// 11 = transparent.
// These 2-bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
colors[2].Blue = unchecked ((byte)((colors[0].Blue + colors[1].Blue) / 2));
colors[2].Green = unchecked ((byte)((colors[0].Green + colors[1].Green) / 2));
colors[2].Red = unchecked ((byte)((colors[0].Red + colors[1].Red) / 2));
colors[2].Alpha = 0xFF;
colors[3].Alpha = 0x0;
}
colors[3].Blue = unchecked ((byte)((colors[0].Blue + 2 * colors[1].Blue + 1) / 3));
colors[3].Green = unchecked ((byte)((colors[0].Green + 2 * colors[1].Green + 1) / 3));
colors[3].Red = unchecked ((byte)((colors[0].Red + 2 * colors[1].Red + 1) / 3));
int bitIndex = 0;
for (int ly = 0; ly < 4; ly++)
{
for (int lx = 0; lx < 4; lx++, bitIndex++)
{
int colorIndex = unchecked ((int)((bitMask & (3 << bitIndex * 2)) >> bitIndex * 2));
Color8888 color = colors[colorIndex];
if ((x + lx) < width && (y - ly) < height && (y - ly) >= 0)
{
// mirror Y
long offset = z * sizeOfPlane + (y - ly) * bps + (x + lx) * bpp;
destination.Position = position + offset;
destination.WriteByte(color.Red);
destination.WriteByte(color.Green);
destination.WriteByte(color.Blue);
destination.WriteByte(color.Alpha);
}
}
}
}
}
}
}