public byte[] UnSwizzle(byte[] data, int width, int height, int blockSize)
{
var unswizzled = new byte[data.Length];
var dataIndex = 0;
int heightTexels = height / 4;
int widthTexels = width / 4;
var texelCount = widthTexels * heightTexels;
for (int texel = 0; texel < texelCount; ++texel)
{
int pixelIndex = SwizzleUtilities.Morton(texel, widthTexels, heightTexels);
int destIndex = blockSize * pixelIndex;
Array.Copy(data, dataIndex, unswizzled, destIndex, blockSize);
dataIndex += blockSize;
}
return(unswizzled);
}
private byte[] DoSwizzle(byte[] data, int width, int height, int blockSize, bool unswizzle)
{
var processed = new byte[data.Length];
var heightTexels = height / 4;
var heightTexelsAligned = (heightTexels + 7) / 8;
int widthTexels = width / 4;
var widthTexelsAligned = (widthTexels + 7) / 8;
var dataIndex = 0;
for (int y = 0; y < heightTexelsAligned; ++y)
{
for (int x = 0; x < widthTexelsAligned; ++x)
{
for (int t = 0; t < 64; ++t)
{
int pixelIndex = SwizzleUtilities.Morton(t, 8, 8);
int num8 = pixelIndex / 8;
int num9 = pixelIndex % 8;
var yOffset = (y * 8) + num8;
var xOffset = (x * 8) + num9;
if (xOffset < widthTexels && yOffset < heightTexels)
{
var destPixelIndex = yOffset * widthTexels + xOffset;
int destIndex = blockSize * destPixelIndex;
if (unswizzle)
{
Array.Copy(data, dataIndex, processed, destIndex, blockSize);
}
else
{
Array.Copy(data, destIndex, processed, dataIndex, blockSize);
}
}
dataIndex += blockSize;
}
}
}
return(processed);
}