private byte[] Deswizzle(uint width, uint height, uint numMipmaps, byte[] image)
{
uint bpp = 8;
uint blkWidth = 4;
uint blkHeight = 4;
uint dataAlignment = 512;
uint blockHeight = SwitchSwizzler.GetBlockHeight(SwitchSwizzler.DivRoundUp(height, blkHeight));
uint blockHeightLog2 = (uint)System.Convert.ToString(blockHeight, 2).Length - 1;
int linesPerBlockHeight = (1 << (int)blockHeightLog2) * 8;
uint totalSize = 0;
for (var i = 0; i < numMipmaps; i++)
{
uint mipmapWidth = Math.Max(1, width >> i);
uint mipmapHeight = Math.Max(1, height >> i);
uint mipmapSize = SwitchSwizzler.DivRoundUp(mipmapWidth, blkWidth) *
SwitchSwizzler.DivRoundUp(mipmapHeight, blkHeight) *
bpp;
totalSize += mipmapSize;
}
var result = new byte[totalSize];
uint surfaceSize = 0;
var blockHeightShift = 0;
List <uint> mipOffsets = new List <uint>();
uint resultOffset = 0;
for (var i = 0; i < numMipmaps; i++)
{
uint mipmapWidth = Math.Max(1, width >> i);
uint mipmapHeight = Math.Max(1, height >> i);
uint mipmapSize = SwitchSwizzler.DivRoundUp(mipmapWidth, blkWidth) *
SwitchSwizzler.DivRoundUp(mipmapHeight, blkHeight) *
bpp;
if (SwitchSwizzler.Pow2RoundUp(SwitchSwizzler.DivRoundUp(mipmapHeight, blkWidth)) < linesPerBlockHeight)
{
blockHeightShift += 1;
}
uint roundWidth = SwitchSwizzler.DivRoundUp(mipmapWidth, blkWidth);
uint roundHeight = SwitchSwizzler.DivRoundUp(mipmapHeight, blkHeight);
surfaceSize += SwitchSwizzler.RoundUp(surfaceSize, dataAlignment) - surfaceSize;
mipOffsets.Add(surfaceSize);
var msize = (int)(mipOffsets[0] + image.Length - mipOffsets[i]);
var mipmap = new byte[msize];
Array.Copy(image, mipOffsets[i], mipmap, 0, msize);
var info = new SwizzleInfo
{
Width = mipmapWidth,
Height = mipmapHeight,
Depth = 1,
BlkWidth = blkWidth,
BlkHeight = blkHeight,
BlkDepth = 1,
RoundPitch = 1,
Bpp = bpp,
TileMode = 0,
BlockHeightLog2 = (int)Math.Max(0, blockHeightLog2 - blockHeightShift),
};
uint pitch = SwitchSwizzler.RoundUp(roundWidth * bpp, 64);
surfaceSize += pitch *
SwitchSwizzler.RoundUp(roundHeight, Math.Max(1, blockHeight >> blockHeightShift) * 8);
byte[] deswizzled = SwitchSwizzler.Deswizzle(info, mipmap);
Array.Copy(deswizzled, 0, result, resultOffset, mipmapSize);
resultOffset += mipmapSize;
}
return(result);
}
/// <summary>
/// Write the swizzled mipmaps to a DataStream.
/// </summary>
/// <param name="height">Image height (in pixels).</param>
/// <param name="width">Image width (in pixels).</param>
/// <param name="mipmaps">The list of mipmaps.</param>
/// <returns>The DataStream.</returns>
protected override DataStream Write(uint height, uint width, List <byte[]> mipmaps)
{
if (mipmaps == null)
{
throw new ArgumentNullException(nameof(mipmaps));
}
DataStream outputDataStream = DataStreamFactory.FromMemory();
var writer = new DataWriter(outputDataStream)
{
DefaultEncoding = Encoding.ASCII,
Endianness = EndiannessMode.LittleEndian,
};
writer.Write(0x20L);
writer.Write(0x10L);
writer.Write(0x20L);
writer.Write(0x00L); // Size
writer.Write(0x00L);
writer.Write(0x00L);
writer.Write(0x20L);
writer.Write(0x18L);
writer.Write(0x28L);
writer.Write(0x00L); // Size - 0x38
writer.Write(width);
writer.Write(height);
writer.Write(0x01);
writer.Write(0x01);
writer.Write(0x49);
writer.Write(mipmaps.Count);
var blockHeightShift = 0;
const uint blkWidth = 4;
const uint blkHeight = 4;
const uint bpp = 8;
uint blockHeight = SwitchSwizzler.GetBlockHeight(SwitchSwizzler.DivRoundUp(height, blkHeight));
uint blockHeightLog2 = (uint)System.Convert.ToString(blockHeight, 2).Length - 1;
uint linesPerBlockHeight = blockHeight * 8;
for (var mipLevel = 0; mipLevel < mipmaps.Count; mipLevel++)
{
byte[] mipmap = mipmaps[mipLevel];
uint mipmapWidth = Math.Max(1, width >> mipLevel);
uint mipmapHeight = Math.Max(1, height >> mipLevel);
uint roundedHeight = SwitchSwizzler.DivRoundUp(mipmapHeight, blkHeight);
if (SwitchSwizzler.Pow2RoundUp(roundedHeight) < linesPerBlockHeight)
{
blockHeightShift += 1;
}
var info = new SwizzleInfo
{
Width = mipmapWidth,
Height = mipmapHeight,
Depth = 1,
BlkWidth = blkWidth,
BlkHeight = blkHeight,
BlkDepth = 1,
RoundPitch = 1,
Bpp = bpp,
TileMode = 0,
BlockHeightLog2 = (int)Math.Max(0, blockHeightLog2 - blockHeightShift),
};
byte[] swizzled = SwitchSwizzler.Swizzle(info, mipmap);
writer.Write(swizzled);
}
writer.Stream.Seek(0x18, System.IO.SeekOrigin.Begin);
writer.Write(outputDataStream.Length - 0x30);
writer.Stream.Seek(0x48, System.IO.SeekOrigin.Begin);
writer.Write(outputDataStream.Length - 0x68);
return(outputDataStream);
}