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port P_CheckSight from vanilla
mostly a copy/paste job, this fixes issues with certain sloped surfaces improperly obstructing sight (ported files from srb2 commit 4c9b83b6bdd8cd3e2626505940de75668e3db0c2)
This commit is contained in:
minenice55
parent
fd88c139a6
commit
a88c115b84
3 changed files with 137 additions and 22 deletions
127
src/p_sight.c
127
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) 1999-2021 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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@ -102,12 +103,20 @@ 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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@ -139,7 +148,22 @@ 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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@ -187,6 +211,8 @@ 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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fixed_t fracx, fracy;
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// already checked other side?
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if (line->validcount == validcount)
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@ -221,36 +247,44 @@ 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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// 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 = P_GetSectorFloorZAt (front, fracx, fracy);
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frontc = P_GetSectorCeilingZAt(front, fracx, fracy);
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backf = P_GetSectorFloorZAt (back , fracx, fracy);
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backc = P_GetSectorCeilingZAt(back , fracx, fracy);
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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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@ -259,6 +293,48 @@ 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|FF_FOG)))
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{
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continue;
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}
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topz = P_GetFFloorTopZAt (rover, fracx, fracy);
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bottomz = P_GetFFloorBottomZAt(rover, fracx, fracy);
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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|FF_FOG)))
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{
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continue;
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}
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topz = P_GetFFloorTopZAt (rover, fracx, fracy);
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bottomz = P_GetFFloorBottomZAt(rover, fracx, fracy);
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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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@ -364,6 +440,8 @@ 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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@ -371,14 +449,19 @@ boolean P_CheckSight(mobj_t *t1, mobj_t *t2)
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/// \todo Improve by checking fog density/translucency
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/// and setting a sight limit.
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if (!(rover->flags & FF_EXISTS)
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|| !(rover->flags & FF_RENDERPLANES) || rover->flags & FF_TRANSLUCENT)
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|| !(rover->flags & FF_RENDERPLANES) || (rover->flags & (FF_TRANSLUCENT|FF_FOG)))
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{
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continue;
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}
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topz1 = P_GetFFloorTopZAt (rover, t1->x, t1->y);
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topz2 = P_GetFFloorTopZAt (rover, t2->x, t2->y);
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bottomz1 = P_GetFFloorBottomZAt(rover, t1->x, t1->y);
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bottomz2 = P_GetFFloorBottomZAt(rover, t2->x, t2->y);
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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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@ -387,21 +470,21 @@ boolean P_CheckSight(mobj_t *t1, mobj_t *t2)
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if (rover->flags & FF_SOLID)
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continue; // shortcut since neither mobj can be inside the 3dfloor
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if (!(rover->flags & FF_INVERTPLANES))
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if (rover->flags & FF_BOTHPLANES || !(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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if (rover->flags & FF_BOTHPLANES || rover->flags & FF_INVERTPLANES)
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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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@ -746,6 +746,30 @@ fixed_t P_GetZAt(pslope_t *slope, fixed_t x, fixed_t y)
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return slope->o.z + FixedMul(dist, slope->zdelta);
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}
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// Returns the height of the sector floor at (x, y)
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fixed_t P_GetSectorFloorZAt(const sector_t *sector, fixed_t x, fixed_t y)
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{
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return sector->f_slope ? P_GetZAt(sector->f_slope, x, y) : sector->floorheight;
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}
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// Returns the height of the sector ceiling at (x, y)
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fixed_t P_GetSectorCeilingZAt(const sector_t *sector, fixed_t x, fixed_t y)
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{
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return sector->c_slope ? P_GetZAt(sector->c_slope, x, y) : sector->ceilingheight;
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}
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// Returns the height of the FOF top at (x, y)
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fixed_t P_GetFFloorTopZAt(const ffloor_t *ffloor, fixed_t x, fixed_t y)
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{
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return *ffloor->t_slope ? P_GetZAt(*ffloor->t_slope, x, y) : *ffloor->topheight;
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}
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// Returns the height of the FOF bottom at (x, y)
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fixed_t P_GetFFloorBottomZAt(const ffloor_t *ffloor, fixed_t x, fixed_t y)
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{
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return *ffloor->b_slope ? P_GetZAt(*ffloor->b_slope, x, y) : *ffloor->bottomheight;
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}
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//
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// P_QuantizeMomentumToSlope
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@ -33,6 +33,14 @@ pslope_t *P_SlopeById(UINT16 id);
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// Returns the height of the sloped plane at (x, y) as a fixed_t
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fixed_t P_GetZAt(pslope_t *slope, fixed_t x, fixed_t y);
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// Returns the height of the sector at (x, y)
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fixed_t P_GetSectorFloorZAt (const sector_t *sector, fixed_t x, fixed_t y);
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fixed_t P_GetSectorCeilingZAt(const sector_t *sector, fixed_t x, fixed_t y);
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// Returns the height of the FOF at (x, y)
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fixed_t P_GetFFloorTopZAt (const ffloor_t *ffloor, fixed_t x, fixed_t y);
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fixed_t P_GetFFloorBottomZAt(const ffloor_t *ffloor, fixed_t x, fixed_t y);
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// Lots of physics-based bullshit
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void P_QuantizeMomentumToSlope(vector3_t *momentum, pslope_t *slope);
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void P_ReverseQuantizeMomentumToSlope(vector3_t *momentum, pslope_t *slope);
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