private static Texture2D LoadTexture2D(DDSImageInfo image, BinaryReader input, SurfaceFormat format)
{
DDSHeader header = image.Header;
int width = header.DwWidth;
int height = header.DwHeight;
int flags = header.ImageFormat.DwFlags;
bool compressedFormat = IsSet(flags, (int)DDSPixelFlags.FourCC);
int[] mipMapSizes = new int[header.DwMipMapCount];
Texture2D tex = new Texture2D(width, height, mipMapSizes.Length > 1, format);
if (compressedFormat)
{
int num = 16;
if (format == SurfaceFormat.DXT1)
{
num = 8;
}
int mipLevel = 0;
while (mipLevel < header.DwMipMapCount)
{
byte[] data = input.ReadBytes(CalculateMipMapSize(true, width, height, num, mipLevel));
tex.SetData <byte>(data, mipLevel, null, 0, data.Length);
width = System.Math.Max(width / 2, 1);
height = System.Math.Max(height / 2, 1);
mipLevel++;
}
}
return(tex);
}
public override Texture Load(IResource resource, LoaderParameters parameters)
{
Stream stream = resource.OpenStream();
BinaryReader input = new BinaryReader(stream);
DDSImageInfo image = ReadHeaderInfo(input);
SurfaceFormat format = DetermineFormat(image);
TextureDimensions dimensions = DetermineTextureDimensions(image);
switch (dimensions)
{
case TextureDimensions.Two:
Texture2D tex2d = LoadTexture2D(image, input, format);
tex2d.Name = resource.Name;
input.Close();
return(tex2d);
case TextureDimensions.Three:
Texture3D tex3d = LoadTexture3D(image, input, format);
tex3d.Name = resource.Name;
input.Close();
return(tex3d);
case TextureDimensions.Cube:
TextureCube texcube = LoadTextureCube(image, input, format);
texcube.Name = resource.Name;
input.Close();
return(texcube);
default:
input.Close();
throw new InvalidOperationException("Error loading DDS file");
}
}
private static SurfaceFormat DetermineFormat(DDSImageInfo image)
{
DDSHeader header = image.Header;
DDSHeader10 header10 = image.Header10;
int flags = header.ImageFormat.DwFlags;
bool compressedFormat = IsSet(flags, (int)DDSPixelFlags.FourCC);
bool rgb = IsSet(flags, (int)DDSPixelFlags.RGB);
bool alphaPixels = IsSet(flags, (int)DDSPixelFlags.AlphaPixels);
bool alpha = IsSet(flags, (int)DDSPixelFlags.Alpha);
bool luminance = IsSet(flags, (int)DDSPixelFlags.Luminance);
if (compressedFormat)
{
int fourCC = header.ImageFormat.DwFourCC;
if (fourCC == GetInt("DXT1"))
{
return(SurfaceFormat.DXT1);
}
else if (fourCC == GetInt("DXT3"))
{
return(SurfaceFormat.DXT3);
}
else if (fourCC == GetInt("DXT5"))
{
return(SurfaceFormat.DXT5);
}
}
else
{
if (rgb)
{
int bpp = header.ImageFormat.DwRGBBitCount;
switch (bpp)
{
case 32:
return(SurfaceFormat.Color);
}
}
else if (alphaPixels && alpha && (header.ImageFormat.DwRGBBitCount == 8))
{
return(SurfaceFormat.Alpha8);
}
}
throw new InvalidDataException("Unsupported DDS format.");
}
private static TextureDimensions DetermineTextureDimensions(DDSImageInfo image)
{
DDSHeader header = image.Header;
DDSHeader10 header10 = image.Header10;
if (IsSet(header.DwCaps2, (int)DDSCaps2.CubeMap))
{
return(TextureDimensions.Cube);
}
else if (IsSet(header.DwCaps2, (int)DDSCaps2.Volume))
{
return(TextureDimensions.Three);
}
else
{
return(TextureDimensions.Two);
}
}
private static DDSImageInfo ReadHeaderInfo(BinaryReader input)
{
int dwMagic = input.ReadInt32();
if (dwMagic != GetInt("DDS "))
{
throw new InvalidOperationException("Not a DDS file");
}
DDSImageInfo image = new DDSImageInfo();
image.Header = ReadHeader(input);
if (image.Header.ImageFormat.DwFourCC == GetInt("DX10"))
{
image.Header10 = ReadHeader10(input);
}
else
{
image.Header10.Exists = false;
}
return(image);
}
private static Texture3D LoadTexture3D(DDSImageInfo image, BinaryReader input, SurfaceFormat format)
{
throw new NotImplementedException();
}