Ryujinx/Ryujinx.Core/Gpu/BlockLinearSwizzle.cs

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namespace Ryujinx.Core.Gpu
{
class BlockLinearSwizzle : ISwizzle
{
private int BhShift;
private int BppShift;
private int BhMask;
private int XShift;
private int GobStride;
public BlockLinearSwizzle(int Width, int Bpp, int BlockHeight = 16)
{
BhMask = (BlockHeight * 8) - 1;
BhShift = CountLsbZeros(BlockHeight * 8);
BppShift = CountLsbZeros(Bpp);
int WidthInGobs = Width * Bpp / 64;
GobStride = 512 * BlockHeight * WidthInGobs;
XShift = CountLsbZeros(512 * BlockHeight);
}
private int CountLsbZeros(int Value)
{
int Count = 0;
while (((Value >> Count) & 1) == 0)
{
Count++;
}
return Count;
}
public int GetSwizzleOffset(int X, int Y)
{
X <<= BppShift;
int Position = (Y >> BhShift) * GobStride;
Position += (X >> 6) << XShift;
Position += ((Y & BhMask) >> 3) << 9;
Position += ((X & 0x3f) >> 5) << 8;
Position += ((Y & 0x07) >> 1) << 6;
Position += ((X & 0x1f) >> 4) << 5;
Position += ((Y & 0x01) >> 0) << 4;
Position += ((X & 0x0f) >> 0) << 0;
return Position;
}
}
}