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invert coverage to fix xmajor aa

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if the calculated y coordinate differs from the expected y coordinate, invert its coverage.
This commit is contained in:
Jaklyy 2023-10-17 18:53:50 -04:00
parent 082310d5d5
commit ed79b1772c
2 changed files with 12 additions and 12 deletions
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12
src/GPU3D_Soft.cpp
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@ -1070,11 +1070,7 @@ void SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y)
xlimit = xstart+l_edgelen;
if (xlimit > xend+1) xlimit = xend+1;
if (xlimit > 256) xlimit = 256;
if (l_edgecov & (1<<31))
{
xcov = (l_edgecov >> 12) & 0x3FF;
if (xcov == 0x3FF) xcov = 0;
}
if (l_edgecov & (1<<31)) xcov = (l_edgecov >> 12) & 0x3FF;
if (!l_filledge) x = xlimit;
else
@ -1259,11 +1255,7 @@ void SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y)
edge = yedge | 0x2;
xlimit = xend+1;
if (xlimit > 256) xlimit = 256;
if (r_edgecov & (1<<31))
{
xcov = (r_edgecov >> 12) & 0x3FF;
if (xcov == 0x3FF) xcov = 0;
}
if (r_edgecov & (1<<31)) xcov = (r_edgecov >> 12) & 0x3FF;
if (r_filledge)
for (; x < xlimit; x++)

12
src/GPU3D_Soft.h
View File

@ -236,6 +236,7 @@ private:
dx = 0;
this->x0 = x0;
this->y0 = y0;
this->xmin = x0;
this->xmax = x0;
@ -253,6 +254,7 @@ private:
constexpr s32 Setup(s32 x0, s32 x1, s32 y0, s32 y1, s32 w0, s32 w1, s32 y)
{
this->x0 = x0;
this->y0 = y0;
this->y = y;
if (x1 > x0)
@ -367,7 +369,13 @@ private:
if (side) startx = startx - *length + 1;
s32 startcov = (((startx << 10) + 0x1FF) * ylen) / xlen;
*coverage = (1<<31) | ((startcov & 0x3FF) << 12) | (xcov_incr & 0x3FF);
// 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);
*coverage = (1<<31) | (startcov << 12) | (xcov_incr & 0x3FF);
if constexpr (swapped) *length = 1;
}
@ -419,7 +427,7 @@ private:
Interpolator<1> Interp;
private:
s32 x0, xmin, xmax;
s32 x0, y0, xmin, xmax;
s32 xlen, ylen;
s32 dx;
s32 y;