public DDSHeader(int width, int height, DDSPixelFormatFourCC format) : this()
{
Height = height;
Width = width;
PitchOrLinearSize = DDSFormatDetails.CalculatePitchOrLinearSize(width, height, format, out var additionalFlags);
Flags |= additionalFlags;
PixelFormat.FourCC = format;
}
public DDSPixelFormat(DdsPixelFormatFlags Flags, DDSPixelFormatFourCC FourCC, uint RGBBitCount, uint BitMaskRed, uint BitMaskGreen, uint BitMaskBlue, uint BitMaskRGBAlpha)
{
Size = 0x20;
this.Flags = Flags;
this.FourCC = FourCC;
this.RGBBitCount = RGBBitCount;
this.BitMaskRed = BitMaskRed;
this.BitMaskGreen = BitMaskGreen;
this.BitMaskBlue = BitMaskBlue;
this.BitMaskRGBAlpha = BitMaskRGBAlpha;
}
public DDSPixelFormat(DDSPixelFormatFlags Flags, DDSPixelFormatFourCC FourCC, uint RGBBitCount, uint BitMaskRed, uint BitMaskGreen, uint BitMaskBlue, uint BitMaskRGBAlpha)
{
this.Size = 0x20;
this.Flags = Flags;
this.FourCC = FourCC;
this.RGBBitCount = RGBBitCount;
this.BitMaskRed = BitMaskRed;
this.BitMaskGreen = BitMaskGreen;
this.BitMaskBlue = BitMaskBlue;
this.BitMaskRGBAlpha = BitMaskRGBAlpha;
}
public static int CalculatePitchOrLinearSize(int width, int height, DDSPixelFormatFourCC format,
out DDSHeaderFlags additionalFlags)
{
if (IsBlockCompressed(format))
{
additionalFlags = DDSHeaderFlags.LinearSize;
return(CalculateLinearSize(width, height, format));
}
additionalFlags = DDSHeaderFlags.Pitch;
return(CalculatePitch(width, format));
}
public static bool IsBlockCompressed(DDSPixelFormatFourCC format)
{
switch (format)
{
case DDSPixelFormatFourCC.DXT1:
case DDSPixelFormatFourCC.DXT2:
case DDSPixelFormatFourCC.DXT3:
case DDSPixelFormatFourCC.DXT4:
case DDSPixelFormatFourCC.DXT5:
case DDSPixelFormatFourCC.ATI1:
case DDSPixelFormatFourCC.ATI2N_3Dc:
return(true);
default:
return(false);
}
}
public static int GetBlockSize(DDSPixelFormatFourCC format)
{
switch (format)
{
case DDSPixelFormatFourCC.DXT1:
case DDSPixelFormatFourCC.ATI1:
return(8);
case DDSPixelFormatFourCC.DXT2:
case DDSPixelFormatFourCC.DXT3:
case DDSPixelFormatFourCC.DXT4:
case DDSPixelFormatFourCC.DXT5:
case DDSPixelFormatFourCC.ATI2N_3Dc:
return(16);
}
return(0);
}
public static int CalculatePitch(int width, DDSPixelFormatFourCC format)
{
if (IsBlockCompressed(format))
{
int blockSize = GetBlockSize(format);
return(Math.Max(1, ((width + 3) / 4)) * blockSize);
}
if (format == DDSPixelFormatFourCC.R8G8_B8G8 || format == DDSPixelFormatFourCC.G8R8_G8B8 ||
format == DDSPixelFormatFourCC.UYVY || format == DDSPixelFormatFourCC.YUY2)
{
return(((width + 1) >> 1) * 4);
}
int bitsPerPixel = GetBitsPerPixel(format);
return((width * bitsPerPixel + 7) / 8);
}
private static PixelInternalFormat GetPixelInternalFormat(DDSPixelFormatFourCC format)
{
switch (format)
{
case DDSPixelFormatFourCC.DXT1:
return(PixelInternalFormat.CompressedRgbaS3tcDxt1Ext);
case DDSPixelFormatFourCC.DXT3:
return(PixelInternalFormat.CompressedRgbaS3tcDxt3Ext);
case DDSPixelFormatFourCC.DXT5:
return(PixelInternalFormat.CompressedRgbaS3tcDxt5Ext);
case DDSPixelFormatFourCC.A8R8G8B8:
return(PixelInternalFormat.Rgba8);
default:
throw new NotImplementedException(format.ToString());
}
}
public DDSPixelFormat(DDSPixelFormatFourCC format) : this()
{
FourCC = format;
}
public static int GetBitsPerPixel(DDSPixelFormatFourCC format)
{
switch (format)
{
case DDSPixelFormatFourCC.DXT1:
case DDSPixelFormatFourCC.ATI1:
return(4);
case DDSPixelFormatFourCC.DXT2:
case DDSPixelFormatFourCC.DXT3:
case DDSPixelFormatFourCC.DXT4:
case DDSPixelFormatFourCC.DXT5:
case DDSPixelFormatFourCC.ATI2N_3Dc:
return(8);
case DDSPixelFormatFourCC.R8G8B8:
return(24);
case DDSPixelFormatFourCC.A8R8G8B8:
case DDSPixelFormatFourCC.X8R8G8B8:
return(32);
case DDSPixelFormatFourCC.R5G6B5:
case DDSPixelFormatFourCC.X1R5G5B5:
case DDSPixelFormatFourCC.A1R5G5B5:
case DDSPixelFormatFourCC.A4R4G4B4:
return(16);
case DDSPixelFormatFourCC.R3G3B2:
case DDSPixelFormatFourCC.A8:
return(8);
case DDSPixelFormatFourCC.A8R3G3B2:
case DDSPixelFormatFourCC.X4R4G4B4:
return(16);
case DDSPixelFormatFourCC.A2B10G10R10:
case DDSPixelFormatFourCC.A8B8G8R8:
case DDSPixelFormatFourCC.X8B8G8R8:
case DDSPixelFormatFourCC.G16R16:
case DDSPixelFormatFourCC.A2R10G10B10:
return(32);
case DDSPixelFormatFourCC.A16B16G16R16:
return(64);
case DDSPixelFormatFourCC.A8P8:
return(16);
case DDSPixelFormatFourCC.P8:
return(8);
case DDSPixelFormatFourCC.L8:
return(8);
case DDSPixelFormatFourCC.A8L8:
return(16);
case DDSPixelFormatFourCC.A4L4:
return(8);
case DDSPixelFormatFourCC.V8U8:
case DDSPixelFormatFourCC.L6V5U5:
return(16);
case DDSPixelFormatFourCC.X8L8V8U8:
case DDSPixelFormatFourCC.Q8W8V8U8:
case DDSPixelFormatFourCC.V16U16:
case DDSPixelFormatFourCC.A2W10V10U10:
return(32);
case DDSPixelFormatFourCC.UYVY:
return(16);
case DDSPixelFormatFourCC.R8G8_B8G8:
return(32);
case DDSPixelFormatFourCC.YUY2:
return(8);
case DDSPixelFormatFourCC.G8R8_G8B8:
return(32);
case DDSPixelFormatFourCC.D16_LOCKABLE:
return(16);
case DDSPixelFormatFourCC.D32:
return(32);
case DDSPixelFormatFourCC.D15S1:
return(16);
case DDSPixelFormatFourCC.D24S8:
return(32);
case DDSPixelFormatFourCC.D24X8:
return(32);
case DDSPixelFormatFourCC.D24X4S4:
return(32);
case DDSPixelFormatFourCC.D16:
return(16);
case DDSPixelFormatFourCC.D32F_LOCKABLE:
return(32);
case DDSPixelFormatFourCC.D24FS8:
return(32);
case DDSPixelFormatFourCC.L16:
return(16);
case DDSPixelFormatFourCC.Q16Q16V16U16:
return(64);
case DDSPixelFormatFourCC.R16F:
return(16);
case DDSPixelFormatFourCC.G16R16F:
return(32);
case DDSPixelFormatFourCC.A16B16G16R16F:
return(64);
case DDSPixelFormatFourCC.R32F:
return(32);
case DDSPixelFormatFourCC.G32R32F:
return(64);
case DDSPixelFormatFourCC.A32B32G32R32F:
return(128);
case DDSPixelFormatFourCC.CxV8U8:
return(16);
}
return(0);
}
public static int CalculateLinearSize(int width, int height, DDSPixelFormatFourCC format)
{
return(((width * height) * GetBitsPerPixel(format)) / 8);
}
