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https://git.do.srb2.org/STJr/SRB2.git
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Merge branch 'checksight-fixes' into 'master'
P_CheckSight fixes See merge request STJr/SRB2Internal!223
This commit is contained in:
Monster Iestyn
commit
68585dbc70
1 changed files with 81 additions and 22 deletions
103
src/p_sight.c
103
src/p_sight.c
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@ -14,6 +14,7 @@
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#include "doomdef.h"
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#include "doomstat.h"
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#include "p_local.h"
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#include "p_slopes.h"
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#include "r_main.h"
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#include "r_state.h"
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@ -216,6 +217,10 @@ static boolean P_CrossSubsector(size_t num, register los_t *los)
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const sector_t *front, *back;
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const vertex_t *v1,*v2;
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fixed_t frac;
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fixed_t frontf, backf, frontc, backc;
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#ifdef ESLOPE
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fixed_t fracx, fracy;
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#endif
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// already checked other side?
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if (line->validcount == validcount)
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@ -250,37 +255,51 @@ static boolean P_CrossSubsector(size_t num, register los_t *los)
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if (!(line->flags & ML_TWOSIDED))
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return false;
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// calculate fractional intercept (how far along we are divided by how far we are from t2)
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frac = P_InterceptVector2(&los->strace, &divl);
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front = seg->frontsector;
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back = seg->backsector;
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#ifdef ESLOPE
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// calculate position at intercept
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fracx = los->strace.x + FixedMul(los->strace.dx, frac);
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fracy = los->strace.y + FixedMul(los->strace.dy, frac);
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// calculate sector heights
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frontf = (front->f_slope) ? P_GetZAt(front->f_slope, fracx, fracy) : front->floorheight;
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frontc = (front->c_slope) ? P_GetZAt(front->c_slope, fracx, fracy) : front->ceilingheight;
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backf = (back->f_slope) ? P_GetZAt(back->f_slope, fracx, fracy) : back->floorheight;
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backc = (back->c_slope) ? P_GetZAt(back->c_slope, fracx, fracy) : back->ceilingheight;
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#else
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frontf = front->floorheight;
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frontc = front->ceilingheight;
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backf = back->floorheight;
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backc = back->ceilingheight;
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#endif
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// crosses a two sided line
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// no wall to block sight with?
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if ((front = seg->frontsector)->floorheight ==
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(back = seg->backsector)->floorheight &&
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front->ceilingheight == back->ceilingheight
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&& !front->ffloors && !back->ffloors)
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if (frontf == backf && frontc == backc
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&& !front->ffloors & !back->ffloors) // (and no FOFs)
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continue;
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// possible occluder
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// because of ceiling height differences
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popentop = front->ceilingheight < back->ceilingheight ?
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front->ceilingheight : back->ceilingheight ;
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popentop = min(frontc, backc);
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// because of floor height differences
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popenbottom = front->floorheight > back->floorheight ?
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front->floorheight : back->floorheight ;
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popenbottom = max(frontf, backf);
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// quick test for totally closed doors
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if (popenbottom >= popentop)
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return false;
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frac = P_InterceptVector2(&los->strace, &divl);
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if (front->floorheight != back->floorheight)
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if (frontf != backf)
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{
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fixed_t slope = FixedDiv(popenbottom - los->sightzstart , frac);
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if (slope > los->bottomslope)
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los->bottomslope = slope;
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}
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if (front->ceilingheight != back->ceilingheight)
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if (frontc != backc)
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{
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fixed_t slope = FixedDiv(popentop - los->sightzstart , frac);
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if (slope < los->topslope)
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@ -295,6 +314,7 @@ static boolean P_CrossSubsector(size_t num, register los_t *los)
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{
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ffloor_t *rover;
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fixed_t topslope, bottomslope;
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fixed_t topz, bottomz;
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// check front sector's FOFs first
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for (rover = front->ffloors; rover; rover = rover->next)
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{
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@ -303,8 +323,16 @@ static boolean P_CrossSubsector(size_t num, register los_t *los)
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{
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continue;
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}
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topslope = FixedDiv(*rover->topheight - los->sightzstart , frac);
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bottomslope = FixedDiv(*rover->bottomheight - los->sightzstart , frac);
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#ifdef ESLOPE
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topz = (*rover->t_slope) ? P_GetZAt(*rover->t_slope, fracx, fracy) : *rover->topheight;
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bottomz = (*rover->b_slope) ? P_GetZAt(*rover->b_slope, fracx, fracy) : *rover->bottomheight;
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#else
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topz = *rover->topheight;
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bottomz = *rover->bottomheight;
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#endif
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topslope = FixedDiv(topz - los->sightzstart , frac);
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bottomslope = FixedDiv(bottomz - los->sightzstart , frac);
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if (topslope >= los->topslope && bottomslope <= los->bottomslope)
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return false; // view completely blocked
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}
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@ -316,8 +344,16 @@ static boolean P_CrossSubsector(size_t num, register los_t *los)
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{
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continue;
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}
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topslope = FixedDiv(*rover->topheight - los->sightzstart , frac);
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bottomslope = FixedDiv(*rover->bottomheight - los->sightzstart , frac);
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#ifdef ESLOPE
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topz = (*rover->t_slope) ? P_GetZAt(*rover->t_slope, fracx, fracy) : *rover->topheight;
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bottomz = (*rover->b_slope) ? P_GetZAt(*rover->b_slope, fracx, fracy) : *rover->bottomheight;
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#else
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topz = *rover->topheight;
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bottomz = *rover->bottomheight;
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#endif
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topslope = FixedDiv(topz - los->sightzstart , frac);
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bottomslope = FixedDiv(bottomz - los->sightzstart , frac);
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if (topslope >= los->topslope && bottomslope <= los->bottomslope)
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return false; // view completely blocked
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}
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@ -434,6 +470,8 @@ boolean P_CheckSight(mobj_t *t1, mobj_t *t2)
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if (s1 == s2) // Both sectors are the same.
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{
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ffloor_t *rover;
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fixed_t topz1, bottomz1; // top, bottom heights at t1's position
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fixed_t topz2, bottomz2; // likewise but for t2
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for (rover = s1->ffloors; rover; rover = rover->next)
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{
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@ -446,9 +484,30 @@ boolean P_CheckSight(mobj_t *t1, mobj_t *t2)
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continue;
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}
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#ifdef ESLOPE
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if (*rover->t_slope)
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{
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topz1 = P_GetZAt(*rover->t_slope, t1->x, t1->y);
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topz2 = P_GetZAt(*rover->t_slope, t2->x, t2->y);
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}
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else
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topz1 = topz2 = *rover->topheight;
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if (*rover->b_slope)
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{
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bottomz1 = P_GetZAt(*rover->b_slope, t1->x, t1->y);
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bottomz2 = P_GetZAt(*rover->b_slope, t2->x, t2->y);
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}
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else
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bottomz1 = bottomz2 = *rover->bottomheight;
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#else
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topz1 = topz2 = *rover->topheight;
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bottomz1 = bottomz2 = *rover->bottomheight;
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#endif
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// Check for blocking floors here.
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if ((los.sightzstart < *rover->bottomheight && t2->z >= *rover->topheight)
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|| (los.sightzstart >= *rover->topheight && t2->z + t2->height < *rover->bottomheight))
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if ((los.sightzstart < bottomz1 && t2->z >= topz2)
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|| (los.sightzstart >= topz1 && t2->z + t2->height < bottomz2))
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{
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// no way to see through that
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return false;
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@ -459,19 +518,19 @@ boolean P_CheckSight(mobj_t *t1, mobj_t *t2)
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if (!(rover->flags & FF_INVERTPLANES))
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{
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if (los.sightzstart >= *rover->topheight && t2->z + t2->height < *rover->topheight)
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if (los.sightzstart >= topz1 && t2->z + t2->height < topz2)
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return false; // blocked by upper outside plane
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if (los.sightzstart < *rover->bottomheight && t2->z >= *rover->bottomheight)
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if (los.sightzstart < bottomz1 && t2->z >= bottomz2)
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return false; // blocked by lower outside plane
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}
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if (rover->flags & FF_INVERTPLANES || rover->flags & FF_BOTHPLANES)
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{
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if (los.sightzstart < *rover->topheight && t2->z >= *rover->topheight)
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if (los.sightzstart < topz1 && t2->z >= topz2)
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return false; // blocked by upper inside plane
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if (los.sightzstart >= *rover->bottomheight && t2->z + t2->height < *rover->bottomheight)
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if (los.sightzstart >= bottomz1 && t2->z + t2->height < bottomz2)
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return false; // blocked by lower inside plane
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}
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}
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