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- fixed friction logic for sectors.

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Issues with the old code:
* when calculating friction for a 3D-floor - swimmable or not - the 3D floor's top texture must be used. The previous version always checked the sector's floor texture, even though the top might as well come from the sector's ceiling.
* 3D floors never checked for the SECF_FRICTION flag at all. According to Boom specs, sector-based friction must be ignored if this is the case.
* Terrain based friction had a higher priority than the sector's own value.

Changed the rules as follows:
* if the sector's SECF_FRICTION flag is set (i.e. something explicitly changed the sector's friction), this value is used regardless of terrain settings.
* if this flag is not set, the terrain's friction is used, if defined, using the proper plane for 3D-floors.
* otherwise the default is used.
This commit is contained in:
Christoph Oelckers 2016-01-09 10:11:20 +01:00
parent efaaccc030
commit 0b5e419593
1 changed files with 12 additions and 10 deletions
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22
src/p_map.cpp
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@ -529,16 +529,18 @@ void P_PlayerStartStomp(AActor *actor)
// //
//========================================================================== //==========================================================================
inline fixed_t secfriction(const sector_t *sec) inline fixed_t secfriction(const sector_t *sec, int plane = sector_t::floor)
{ {
fixed_t friction = Terrains[TerrainTypes[sec->GetTexture(sector_t::floor)]].Friction; if (sec->Flags & SECF_FRICTION) return sec->friction;
return friction != 0 ? friction : sec->friction; fixed_t friction = Terrains[TerrainTypes[sec->GetTexture(plane)]].Friction;
return friction != 0 ? friction : ORIG_FRICTION;
} }
inline fixed_t secmovefac(const sector_t *sec) inline fixed_t secmovefac(const sector_t *sec, int plane = sector_t::floor)
{ {
fixed_t movefactor = Terrains[TerrainTypes[sec->GetTexture(sector_t::floor)]].MoveFactor; if (sec->Flags & SECF_FRICTION) return sec->friction;
return movefactor != 0 ? movefactor : sec->movefactor; fixed_t movefactor = Terrains[TerrainTypes[sec->GetTexture(plane)]].MoveFactor;
return movefactor != 0 ? movefactor : ORIG_FRICTION_FACTOR;
} }
//========================================================================== //==========================================================================
@ -584,11 +586,11 @@ int P_GetFriction(const AActor *mo, int *frictionfactor)
mo->z < rover->bottom.plane->ZatPoint(mo->x, mo->y)) mo->z < rover->bottom.plane->ZatPoint(mo->x, mo->y))
continue; continue;
newfriction = secfriction(rover->model); newfriction = secfriction(rover->model, rover->top.isceiling);
if (newfriction < friction || friction == ORIG_FRICTION) if (newfriction < friction || friction == ORIG_FRICTION)
{ {
friction = newfriction; friction = newfriction;
movefactor = secmovefac(rover->model) >> 1; movefactor = secmovefac(rover->model, rover->top.isceiling) >> 1;
} }
} }
} }
@ -622,11 +624,11 @@ int P_GetFriction(const AActor *mo, int *frictionfactor)
else else
continue; continue;
newfriction = secfriction(rover->model); newfriction = secfriction(rover->model, rover->top.isceiling);
if (newfriction < friction || friction == ORIG_FRICTION) if (newfriction < friction || friction == ORIG_FRICTION)
{ {
friction = newfriction; friction = newfriction;
movefactor = secmovefac(rover->model); movefactor = secmovefac(rover->model, rover->top.isceiling);
} }
} }