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using System;
namespace Ryujinx.Graphics.Gal.Texture
{
class SwizzleAddr
{
private int Width;
private int XB;
private int YB;
public SwizzleAddr(int Width, int Height, int Pad)
{
int W = Pow2RoundUp(Width);
int H = Pow2RoundUp(Height);
XB = CountZeros(W);
YB = CountZeros(H);
int HH = H >> 1;
if (!IsPow2(Height) && Height <= HH + HH / 3 && YB > 3)
{
YB--;
}
this.Width = RoundSize(Width, Pad);
}
private static int Pow2RoundUp(int Value)
{
Value--;
Value |= (Value >> 1);
Value |= (Value >> 2);
Value |= (Value >> 4);
Value |= (Value >> 8);
Value |= (Value >> 16);
return ++Value;
}
private static bool IsPow2(int Value)
{
return Value != 0 && (Value & (Value - 1)) == 0;
}
private static int CountZeros(int Value)
{
int Count = 0;
for (int i = 0; i < 32; i++)
{
if ((Value & (1 << i)) != 0)
{
break;
}
Count++;
}
return Count;
}
private static int RoundSize(int Size, int Pad)
{
int Mask = Pad - 1;
if ((Size & Mask) != 0)
{
Size &= ~Mask;
Size += Pad;
}
return Size;
}
public int GetSwizzledAddress8(int X, int Y)
{
return GetSwizzledAddress(X, Y, 4);
}
public int GetSwizzledAddress16(int X, int Y)
{
return GetSwizzledAddress(X, Y, 3);
}
public int GetSwizzledAddress32(int X, int Y)
{
return GetSwizzledAddress(X, Y, 2);
}
public int GetSwizzledAddress64(int X, int Y)
{
return GetSwizzledAddress(X, Y, 1);
}
public int GetSwizzledAddress128(int X, int Y)
{
return GetSwizzledAddress(X, Y, 0);
}
private int GetSwizzledAddress(int X, int Y, int XBase)
{
/*
* Examples of patterns:
* x x y x y y x y 0 0 0 0 64 x 64 dxt5
* x x x x x y y y y x y y x y 0 0 0 0 512 x 512 dxt5
* y x x x x x x y y y y x y y x y 0 0 0 0 1024 x 1024 dxt5
* y y x x x x x x y y y y x y y x y x 0 0 0 2048 x 2048 dxt1
* y y y x x x x x x y y y y x y y x y x x 0 0 1024 x 1024 rgba8888
*
* Read from right to left, LSB first.
*/
int XCnt = XBase;
int YCnt = 1;
int XUsed = 0;
int YUsed = 0;
int Address = 0;
while (XUsed < XBase + 2 && XUsed + XCnt < XB)
{
int XMask = (1 << XCnt) - 1;
int YMask = (1 << YCnt) - 1;
Address |= (X & XMask) << XUsed + YUsed;
Address |= (Y & YMask) << XUsed + YUsed + XCnt;
X >>= XCnt;
Y >>= YCnt;
XUsed += XCnt;
YUsed += YCnt;
XCnt = Math.Min(XB - XUsed, 1);
YCnt = Math.Min(YB - YUsed, YCnt << 1);
}
Address |= (X + Y * (Width >> XUsed)) << (XUsed + YUsed);
return Address;
}
}
}
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