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Fix aa being upside down on swapped y-major slopes (#1803)

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* fix aa being upside down on swapped y-major slopes

* further improvements to swapped aa

in addition to fixing swapped y-major slope aa, now fixes:
swapped x-major slope aa
swapped vertical slope aa

* use templates instead + style/comment tweaks

should force the compiler to precompile if statements like i want it to do, instead of just hoping it does so on its own
This commit is contained in:
Jaklyy
2023-08-27 07:28:44 -04:00
committed by GitHub
parent d7369857c3
commit dc8efb62b8
2 changed files with 42 additions and 22 deletions
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22
src/GPU3D_Soft.cpp
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@ -753,8 +753,8 @@ void SoftRenderer::RenderShadowMaskScanline(RendererPolygon* rp, s32 y)
interp_start = &rp->SlopeR.Interp;
interp_end = &rp->SlopeL.Interp;
rp->SlopeR.EdgeParams_YMajor(&l_edgelen, &l_edgecov);
rp->SlopeL.EdgeParams_YMajor(&r_edgelen, &r_edgecov);
rp->SlopeR.EdgeParams<true>(&l_edgelen, &l_edgecov);
rp->SlopeL.EdgeParams<true>(&r_edgelen, &r_edgecov);
std::swap(xstart, xend);
std::swap(wl, wr);
@ -771,8 +771,8 @@ void SoftRenderer::RenderShadowMaskScanline(RendererPolygon* rp, s32 y)
interp_start = &rp->SlopeL.Interp;
interp_end = &rp->SlopeR.Interp;
rp->SlopeL.EdgeParams(&l_edgelen, &l_edgecov);
rp->SlopeR.EdgeParams(&r_edgelen, &r_edgecov);
rp->SlopeL.EdgeParams<false>(&l_edgelen, &l_edgecov);
rp->SlopeR.EdgeParams<false>(&r_edgelen, &r_edgecov);
}
// color/texcoord attributes aren't needed for shadow masks
@ -958,10 +958,8 @@ void SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y)
// if the left and right edges are swapped, render backwards.
// on hardware, swapped edges seem to break edge length calculation,
// causing X-major edges to be rendered wrong when
// wireframe/edgemarking/antialiasing are used
// it also causes bad antialiasing, but not sure what's going on (TODO)
// most probable explanation is that such slopes are considered to be Y-major
// causing X-major edges to be rendered wrong when filled,
// and resulting in buggy looking anti-aliasing on X-major edges
if (xstart > xend)
{
@ -973,8 +971,8 @@ void SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y)
interp_start = &rp->SlopeR.Interp;
interp_end = &rp->SlopeL.Interp;
rp->SlopeR.EdgeParams_YMajor(&l_edgelen, &l_edgecov);
rp->SlopeL.EdgeParams_YMajor(&r_edgelen, &r_edgecov);
rp->SlopeR.EdgeParams<true>(&l_edgelen, &l_edgecov);
rp->SlopeL.EdgeParams<true>(&r_edgelen, &r_edgecov);
std::swap(xstart, xend);
std::swap(wl, wr);
@ -991,8 +989,8 @@ void SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y)
interp_start = &rp->SlopeL.Interp;
interp_end = &rp->SlopeR.Interp;
rp->SlopeL.EdgeParams(&l_edgelen, &l_edgecov);
rp->SlopeR.EdgeParams(&r_edgelen, &r_edgecov);
rp->SlopeL.EdgeParams<false>(&l_edgelen, &l_edgecov);
rp->SlopeR.EdgeParams<false>(&r_edgelen, &r_edgecov);
}
// interpolate attributes along Y