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3D: keep the rasterizer from accidentally going out of bounds when given very flat X-major edge slopes.

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this, by a fucking shitshow of butterfly effect, ends up fixing #234. technically, the rasterizer was going out of bounds, which, under certain circumstances, caused interpolation to shit itself and generate Z values that were out of range (but still ended up in the zbuffer). sometimes those values ended up negative, which caused these glitches when polygons had to be drawn over those.

about fucking time.
This commit is contained in:
StapleButter
2018-11-04 23:21:58 +01:00
parent fb284f33ad
commit b4165cc0a9
7 changed files with 165 additions and 14 deletions
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22
src/GPU3D_Soft.cpp
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@ -1213,7 +1213,9 @@ void RenderShadowMaskScanline(RendererPolygon* rp, s32 y)
// part 1: left edge
edge = yedge | 0x1;
xlimit = xstart+l_edgelen; if (xlimit > 256) xlimit = 256;
xlimit = xstart+l_edgelen;
if (xlimit > xend+1) xlimit = xend+1;
if (xlimit > 256) xlimit = 256;
for (; x < xlimit; x++)
{
@ -1241,7 +1243,9 @@ void RenderShadowMaskScanline(RendererPolygon* rp, s32 y)
// part 2: polygon inside
edge = yedge;
xlimit = xend-r_edgelen+1; if (xlimit > 256) xlimit = 256;
xlimit = xend-r_edgelen+1;
if (xlimit > xend+1) xlimit = xend+1;
if (xlimit > 256) xlimit = 256;
if (wireframe && !edge) x = xlimit;
else for (; x < xlimit; x++)
{
@ -1265,7 +1269,8 @@ void RenderShadowMaskScanline(RendererPolygon* rp, s32 y)
// part 3: right edge
edge = yedge | 0x2;
xlimit = xend+1; if (xlimit > 256) xlimit = 256;
xlimit = xend+1;
if (xlimit > 256) xlimit = 256;
for (; x < xlimit; x++)
{
@ -1436,7 +1441,9 @@ void RenderPolygonScanline(RendererPolygon* rp, s32 y)
// part 1: left edge
edge = yedge | 0x1;
xlimit = xstart+l_edgelen; if (xlimit > 256) xlimit = 256;
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;
@ -1535,7 +1542,9 @@ void RenderPolygonScanline(RendererPolygon* rp, s32 y)
// part 2: polygon inside
edge = yedge;
xlimit = xend-r_edgelen+1; if (xlimit > 256) xlimit = 256;
xlimit = xend-r_edgelen+1;
if (xlimit > xend+1) xlimit = xend+1;
if (xlimit > 256) xlimit = 256;
if (wireframe && !edge) x = xlimit;
else for (; x < xlimit; x++)
{
@ -1603,7 +1612,8 @@ void RenderPolygonScanline(RendererPolygon* rp, s32 y)
// part 3: right edge
edge = yedge | 0x2;
xlimit = xend+1; if (xlimit > 256) xlimit = 256;
xlimit = xend+1;
if (xlimit > 256) xlimit = 256;
if (r_edgecov & (1<<31))
{
xcov = (r_edgecov >> 12) & 0x3FF;