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rewrite of aa code

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should behave identically
This commit is contained in:
Jaklyy
2023-10-18 00:36:53 -04:00
parent ed79b1772c
commit 0c8095c1bb
2 changed files with 19 additions and 36 deletions
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31
src/GPU3D_Soft.h
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@ -246,7 +246,7 @@ private:
Interp.Setup(0, 0, 0, 0);
Interp.SetX(0);
xcov_incr = 0;
XCov_Incr = 0;
return x0;
}
@ -322,7 +322,7 @@ private:
Interp.SetX(y);
// used for calculating AA coverage
if (XMajor) xcov_incr = (ylen << 10) / xlen;
if (XMajor) XCov_Incr = ((ylen << 10) / xlen) & 0x3FF;
return x;
}
@ -373,9 +373,11 @@ private:
// fix the y value for negative slopes
s32 ycoord = Negative ? (ylen << 10) - startcov >> 10 : startcov >> 10;
// if yvalue is not equal to actual y value, invert coverage value
if (ycoord != y - y0) startcov = 0x3FF - (startcov & 0x3FF);
startcov &= 0x3FF;
if (ycoord != y - y0) startcov = 0x3FF - startcov;
if (side ^ swapped) startcov = 0x3FF - startcov;
*coverage = (1<<31) | (startcov << 12) | (xcov_incr & 0x3FF);
*coverage = startcov;
if constexpr (swapped) *length = 1;
}
@ -389,26 +391,17 @@ private:
{
// for some reason vertical edges' aa values
// are inverted too when the edges are swapped
if constexpr (swapped)
*coverage = 0;
else
*coverage = 31;
*coverage = swapped ? 0 : 31 << 5;
}
else
{
s32 cov = ((dx >> 9) + (Increment >> 10)) >> 4;
if ((cov >> 5) != (dx >> 18)) cov = 31;
cov &= 0x1F;
if constexpr (swapped)
{
if (side ^ Negative) cov = 0x1F - cov;
}
else
{
if (!(side ^ Negative)) cov = 0x1F - cov;
}
if (side ^ !Negative ^ swapped) cov = 0x1F - cov;
*coverage = cov;
// shift left 5 just to make it align with xmajor coverage values
*coverage = cov << 5;
}
}
@ -425,15 +418,13 @@ private:
bool Negative;
bool XMajor;
Interpolator<1> Interp;
s32 XCov_Incr;
private:
s32 x0, y0, xmin, xmax;
s32 xlen, ylen;
s32 dx;
s32 y;
s32 xcov_incr;
s32 ycoverage, ycov_incr;
};
template <typename T>