private static SurfaceInfo GetSurfaceInfo(uint width, uint height, DdsImageFormat format, DdsHeader header)
{
uint rowBytes = 0;
switch (format)
{
case DdsImageFormat.Rg8SNorm:
rowBytes = (width * 16 + 7) / 8; // round up to nearest byte
break;
case DdsImageFormat.Rgba8:
rowBytes = width * (header.PixelFormat.RgbBitCount / 8);
break;
case DdsImageFormat.Rgba16Float:
rowBytes = width * 8;
break;
}
if (rowBytes > 0)
{
return(new SurfaceInfo
{
RowBytes = rowBytes,
NumRows = height,
NumBytes = rowBytes * height
});
}
uint blockSize;
switch (format)
{
case DdsImageFormat.Bc1:
blockSize = 8;
break;
case DdsImageFormat.Bc2:
case DdsImageFormat.Bc3:
blockSize = 16;
break;
default:
throw new ArgumentOutOfRangeException();
}
var numBlocksWide = width / 4;
var numBlocksHigh = height / 4;
return(new SurfaceInfo
{
RowBytes = numBlocksWide * blockSize,
NumRows = numBlocksHigh,
NumBytes = numBlocksWide * blockSize * numBlocksHigh
});
}
private static SurfaceInfo GetSurfaceInfo(uint width, uint height, DdsImageFormat format)
{
if (format == DdsImageFormat.Rg8SNorm)
{
var rowBytes = (width * 16 + 7) / 8; // round up to nearest byte
return(new SurfaceInfo
{
RowBytes = rowBytes,
NumRows = height,
NumBytes = rowBytes * height
});
}
uint blockSize;
switch (format)
{
case DdsImageFormat.Bc1:
blockSize = 8;
break;
case DdsImageFormat.Bc2:
case DdsImageFormat.Bc3:
blockSize = 16;
break;
default:
throw new ArgumentOutOfRangeException();
}
var numBlocksWide = 0u;
if (width > 0)
{
numBlocksWide = Math.Max(1, (width + 3) / 4);
}
var numBlocksHigh = 0u;
if (height > 0)
{
numBlocksHigh = Math.Max(1, (height + 3) / 4);
}
return(new SurfaceInfo
{
RowBytes = numBlocksWide * blockSize,
NumRows = numBlocksHigh,
NumBytes = numBlocksWide * blockSize * numBlocksHigh
});
}
private static PixelFormat ToPixelFormat(DdsImageFormat imageFormat)
{
switch (imageFormat)
{
case DdsImageFormat.Bc1:
return(PixelFormat.Bc1);
case DdsImageFormat.Bc2:
return(PixelFormat.Bc2);
case DdsImageFormat.Bc3:
return(PixelFormat.Bc3);
default:
throw new ArgumentOutOfRangeException(nameof(imageFormat));
}
}
private static SurfaceInfo GetSurfaceInfo(uint width, uint height, DdsImageFormat format)
{
uint blockSize;
switch (format)
{
case DdsImageFormat.Bc1:
blockSize = 8;
break;
case DdsImageFormat.Bc2:
case DdsImageFormat.Bc3:
blockSize = 16;
break;
default:
throw new ArgumentOutOfRangeException();
}
var numBlocksWide = 0u;
if (width > 0)
{
numBlocksWide = Math.Max(1, (width + 3) / 4);
}
var numBlocksHigh = 0u;
if (height > 0)
{
numBlocksHigh = Math.Max(1, (height + 3) / 4);
}
return(new SurfaceInfo
{
RowBytes = numBlocksWide * blockSize,
NumRows = numBlocksHigh,
NumBytes = numBlocksWide * blockSize * numBlocksHigh
});
}
