private static List <byte[]> GetMipMapData(DdsFile file)
{
const int minimumWidth = 4;
const int minimumHeight = 4;
List <byte[]> mipMapDatas = new List <byte[]>();
byte[] data = file.Data;
int dataOffset = 0;
int width = file.Header.Width;
int height = file.Header.Height;
int depth = file.Header.Depth == 0 ? 1 : file.Header.Depth;
int mipMapsCount = file.Header.Flags.HasFlag(DdsFileHeaderFlags.MipMap) ? file.Header.MipMapCount : 1;
for (int i = 0; i < mipMapsCount; i++)
{
int size = DdsPixelFormat.CalculateImageSize(file.Header.PixelFormat, width, height, depth);
var buffer = new byte[size];
Array.Copy(data, dataOffset, buffer, 0, size);
mipMapDatas.Add(buffer);
dataOffset += size;
width = Math.Max(width / 2, minimumWidth);
height = Math.Max(height / 2, minimumHeight);
}
return(mipMapDatas);
}
private static DdsFile GenerateDds(DdsOptions options)
{
DdsFile ddsFile = new DdsFile();
ddsFile.Header = new DdsFileHeader
{
Size = DdsFileHeader.DefaultHeaderSize,
Flags = DdsFileHeaderFlags.Texture,
Width = options.Width,
Height = options.Height,
Depth = options.Depth,
MipMapCount = options.MipMapCount,
Caps = DdsSurfaceFlags.Texture,
PixelFormat = options.PixelFormat
};
if (ddsFile.Header.Depth > 1)
{
ddsFile.Header.Flags |= DdsFileHeaderFlags.Volume;
}
int mipMapCount = ddsFile.Header.MipMapCount;
if (ddsFile.Header.MipMapCount == 1)
{
ddsFile.Header.MipMapCount = 0;
}
else if (ddsFile.Header.MipMapCount > 1)
{
ddsFile.Header.Flags |= DdsFileHeaderFlags.MipMap;
ddsFile.Header.Caps |= DdsSurfaceFlags.MipMap;
}
const int minimumWidth = 4;
const int minimumHeight = 4;
int mipMapHeight = ddsFile.Header.Height;
int mipMapWidth = ddsFile.Header.Width;
int mipMapDepth = ddsFile.Header.Depth == 0 ? 1 : ddsFile.Header.Depth;
int mipMapBufferSize = 0;
for (int i = 0; i < mipMapCount; i++)
{
int mipMapSize = DdsPixelFormat.CalculateImageSize(ddsFile.Header.PixelFormat, mipMapWidth, mipMapHeight, mipMapDepth);
mipMapBufferSize += mipMapSize;
mipMapWidth = Math.Max(mipMapWidth / 2, minimumWidth);
mipMapHeight = Math.Max(mipMapHeight / 2, minimumHeight);
}
ddsFile.Data = new byte[mipMapBufferSize];
for (int i = 0; i < mipMapBufferSize; i++)
{
ddsFile.Data[i] = (byte)(i % 0xFF);
}
return(ddsFile);
}
