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add half pixel correction to fix distortion (#1074)

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Roman Fomin 2023-05-24 15:18:11 +07:00 committed by GitHub
parent 097fa6a951
commit bf1c0694e6
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1 changed files with 14 additions and 5 deletions
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19
src/r_plane.c
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@ -122,7 +122,8 @@ static void R_MapPlane(int y, int x1, int x2)
{
fixed_t distance;
unsigned index;
int dx, dy;
int dx;
fixed_t dy;
#ifdef RANGECHECK
if (x2 < x1 || x1<0 || x2>=viewwidth || (unsigned)y>viewheight)
@ -130,15 +131,23 @@ static void R_MapPlane(int y, int x1, int x2)
#endif
// [FG] calculate flat coordinates relative to screen center
if (!(dy = abs(centery - y)))
//
// SoM: because centery is an actual row of pixels (and it isn't really the
// center row because there are an even number of rows) some corrections need
// to be made depending on where the row lies relative to the centery row.
if (centery == y)
return;
else if (y < centery)
dy = (abs(centery - y) << FRACBITS) - FRACUNIT / 2;
else
dy = (abs(centery - y) << FRACBITS) + FRACUNIT / 2;
if (planeheight != cachedheight[y])
{
cachedheight[y] = planeheight;
distance = cacheddistance[y] = FixedMul (planeheight, yslope[y]);
ds_xstep = cachedxstep[y] = FixedMul (viewsin, planeheight) / dy;
ds_ystep = cachedystep[y] = FixedMul (viewcos, planeheight) / dy;
distance = cacheddistance[y] = FixedMul(planeheight, yslope[y]);
ds_xstep = cachedxstep[y] = FixedDiv(FixedMul(viewsin, planeheight), dy);
ds_ystep = cachedystep[y] = FixedDiv(FixedMul(viewcos, planeheight), dy);
}
else
{