mirror of
https://github.com/KartKrewDev/RingRacers.git
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2.2 sight checks backport
This commit is contained in:
Sally Cochenour
parent
1cbb4bea6b
commit
04b443d58c
1 changed files with 142 additions and 19 deletions
161
src/p_sight.c
161
src/p_sight.c
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@ -2,7 +2,7 @@
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//-----------------------------------------------------------------------------
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// Copyright (C) 1993-1996 by id Software, Inc.
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// Copyright (C) 1998-2000 by DooM Legacy Team.
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// Copyright (C) 1999-2018 by Sonic Team Junior.
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// Copyright (C) 1999-2020 by Sonic Team Junior.
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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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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@ -103,12 +104,20 @@ static fixed_t P_InterceptVector2(divline_t *v2, divline_t *v1)
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static boolean P_CrossSubsecPolyObj(polyobj_t *po, register los_t *los)
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{
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size_t i;
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sector_t *polysec;
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if (!(po->flags & POF_RENDERALL))
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return true; // the polyobject isn't visible, so we can ignore it
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polysec = po->lines[0]->backsector;
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for (i = 0; i < po->numLines; ++i)
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{
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line_t *line = po->lines[i];
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divline_t divl;
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const vertex_t *v1,*v2;
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fixed_t frac;
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fixed_t topslope, bottomslope;
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// already checked other side?
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if (line->validcount == validcount)
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@ -140,7 +149,22 @@ static boolean P_CrossSubsecPolyObj(polyobj_t *po, register los_t *los)
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continue;
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// stop because it is not two sided
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return false;
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//if (!(po->flags & POF_TESTHEIGHT))
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//return false;
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frac = P_InterceptVector2(&los->strace, &divl);
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// get slopes of top and bottom of this polyobject line
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topslope = FixedDiv(polysec->ceilingheight - los->sightzstart , frac);
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bottomslope = FixedDiv(polysec->floorheight - 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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// TODO: figure out if it's worth considering partially blocked cases or not?
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// maybe to adjust los's top/bottom slopes if needed
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//if (los->topslope <= los->bottomslope)
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//return false;
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}
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return true;
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@ -193,6 +217,15 @@ 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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/* SRB2Kart doesn't have this?
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if (seg->glseg)
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continue;
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*/
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// already checked other side?
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if (line->validcount == validcount)
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@ -227,36 +260,51 @@ 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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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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@ -265,6 +313,58 @@ static boolean P_CrossSubsector(size_t num, register los_t *los)
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if (los->topslope <= los->bottomslope)
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return false;
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// Monster Iestyn: check FOFs!
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if (front->ffloors || back->ffloors)
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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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if (!(rover->flags & FF_EXISTS)
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|| !(rover->flags & FF_RENDERSIDES) || rover->flags & FF_TRANSLUCENT)
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{
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continue;
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}
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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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// check back sector's FOFs as well
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for (rover = back->ffloors; rover; rover = rover->next)
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{
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if (!(rover->flags & FF_EXISTS)
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|| !(rover->flags & FF_RENDERSIDES) || rover->flags & FF_TRANSLUCENT)
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{
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continue;
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}
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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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// TODO: figure out if it's worth considering partially blocked cases or not?
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// maybe to adjust los's top/bottom slopes if needed
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}
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}
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// passed the subsector ok
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@ -375,6 +475,8 @@ 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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@ -387,9 +489,30 @@ 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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@ -400,19 +523,19 @@ 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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