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p_map.cpp
7124 lines (6266 loc) · 207 KB
/
p_map.cpp
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//-----------------------------------------------------------------------------
//
// Copyright 1993-1996 id Software
// Copyright 1994-1996 Raven Software
// Copyright 1998-1998 Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
// Copyright 1999-2016 Randy Heit
// Copyright 2002-2017 Christoph Oelckers
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see http://www.gnu.org/licenses/
//
//-----------------------------------------------------------------------------
//
// DESCRIPTION:
// Movement, collision handling.
// Shooting and aiming.
//
//-----------------------------------------------------------------------------
/* For code that originates from ZDoom the following applies:
**
**---------------------------------------------------------------------------
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include <stdlib.h>
#include <math.h>
#include <algorithm>
#include "templates.h"
#include "m_bbox.h"
#include "m_random.h"
#include "c_dispatch.h"
#include "doomdef.h"
#include "p_local.h"
#include "p_spec.h"
#include "d_player.h"
#include "p_maputl.h"
#include "p_lnspec.h"
#include "p_effect.h"
#include "p_terrain.h"
#include "p_trace.h"
#include "p_checkposition.h"
#include "p_linetracedata.h"
#include "r_utility.h"
#include "p_blockmap.h"
#include "p_3dmidtex.h"
#include "vm.h"
#include "decallib.h"
// State.
#include "a_sharedglobal.h"
#include "p_conversation.h"
#include "r_sky.h"
#include "g_levellocals.h"
#include "actorinlines.h"
CVAR(Bool, cl_bloodsplats, true, CVAR_ARCHIVE)
CVAR(Int, sv_smartaim, 0, CVAR_ARCHIVE | CVAR_SERVERINFO)
CVAR(Bool, cl_doautoaim, false, CVAR_ARCHIVE)
static void CheckForPushSpecial(line_t *line, int side, AActor *mobj, DVector2 * posforwindowcheck = NULL);
static void SpawnShootDecal(AActor *t1, const FTraceResults &trace);
static void SpawnDeepSplash(AActor *t1, const FTraceResults &trace, AActor *puff);
static FRandom pr_tracebleed("TraceBleed");
static FRandom pr_checkthing("CheckThing");
static FRandom pr_lineattack("LineAttack");
static FRandom pr_crunch("DoCrunch");
// keep track of special lines as they are hit,
// but don't process them until the move is proven valid
TArray<spechit_t> spechit;
TArray<spechit_t> portalhit;
// FCheckPosition requires explicit contstruction and destruction when used in the VM
DEFINE_ACTION_FUNCTION(_FCheckPosition, _Constructor)
{
PARAM_SELF_STRUCT_PROLOGUE(FCheckPosition);
new(self) FCheckPosition;
return 0;
}
DEFINE_ACTION_FUNCTION(_FCheckPosition, _Destructor)
{
PARAM_SELF_STRUCT_PROLOGUE(FCheckPosition);
self->~FCheckPosition();
return 0;
}
DEFINE_ACTION_FUNCTION(_FCheckPosition, ClearLastRipped)
{
PARAM_SELF_STRUCT_PROLOGUE(FCheckPosition);
self->LastRipped.Clear();
return 0;
}
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, thing);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, pos);
DEFINE_FIELD_NAMED_X(FCheckPosition, FCheckPosition, sector, cursector);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, floorz);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, ceilingz);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, dropoffz);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, floorpic);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, floorterrain);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, floorsector);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, ceilingpic);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, ceilingsector);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, touchmidtex);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, abovemidtex);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, floatok);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, FromPMove);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, ceilingline);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, stepthing);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, DoRipping);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, portalstep);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, portalgroup);
DEFINE_FIELD_X(FCheckPosition, FCheckPosition, PushTime);
//==========================================================================
//
// CanCollideWith
//
// Checks if an actor can collide with another one, calling virtual script functions to check.
//
//==========================================================================
bool P_CanCollideWith(AActor *tmthing, AActor *thing)
{
static unsigned VIndex = ~0u;
if (VIndex == ~0u)
{
VIndex = GetVirtualIndex(RUNTIME_CLASS(AActor), "CanCollideWith");
assert(VIndex != ~0u);
}
VMValue params[3] = { tmthing, thing, false };
VMReturn ret;
int retval;
ret.IntAt(&retval);
auto clss = tmthing->GetClass();
VMFunction *func = clss->Virtuals.Size() > VIndex ? clss->Virtuals[VIndex] : nullptr;
if (func != nullptr)
{
VMCall(func, params, 3, &ret, 1);
if (!retval) return false;
}
std::swap(params[0].a, params[1].a);
params[2].i = true;
// re-get for the other actor.
clss = thing->GetClass();
func = clss->Virtuals.Size() > VIndex ? clss->Virtuals[VIndex] : nullptr;
if (func != nullptr)
{
VMCall(func, params, 3, &ret, 1);
if (!retval) return false;
}
return true;
}
//==========================================================================
//
// FindRefPoint
//
// Finds the point on the line closest to the given coordinate
//
//==========================================================================
static DVector2 FindRefPoint(line_t *ld, const DVector2 &pos)
{
// If there's any chance of slopes getting in the way we need to get a proper refpoint, otherwise we can save the work.
// Slopes can get in here when:
// - the actual sector planes are sloped
// - there's 3D floors in this sector
// - there's a crossable floor portal (for which the dropoff needs to be calculated within P_LineOpening, and the lower sector can easily have slopes)
//
// Todo: check if this bootload of checks even helps or if it adds more than it saves
//
if (ld->frontsector->floorplane.isSlope() ||
ld->backsector->floorplane.isSlope() ||
ld->frontsector->ceilingplane.isSlope() ||
ld->backsector->ceilingplane. isSlope() ||
ld->backsector->e->XFloor.ffloors.Size() != 0 ||
ld->frontsector->e->XFloor.ffloors.Size() != 0 ||
!ld->frontsector->PortalBlocksMovement(sector_t::ceiling) ||
!ld->frontsector->PortalBlocksMovement(sector_t::floor))
{
DVector2 v1 = ld->v1->fPos();
DVector2 d = ld->Delta();
double r = clamp(((pos.X - v1.X) * d.X + (pos.Y - v1.Y) * d.Y) / (d.X*d.X + d.Y*d.Y), 0., 1.);
return v1 + d*r;
}
return pos;
}
//==========================================================================
//
// PIT_FindFloorCeiling
//
// only3d set means to only check against 3D floors and midtexes.
//
//==========================================================================
bool ffcf_verbose;
static bool PIT_FindFloorCeiling(FMultiBlockLinesIterator &mit, FMultiBlockLinesIterator::CheckResult &cres, const FBoundingBox &box, FCheckPosition &tmf, int flags)
{
line_t *ld = cres.line;
if (!box.inRange(ld) || box.BoxOnLineSide(ld) != -1)
return true;
// A line has been hit
if (ffcf_verbose)
{
Printf("Hit line %d at position %f,%f, group %d\n",
ld->Index(), cres.Position.X, cres.Position.Y, ld->frontsector->PortalGroup);
}
if (!ld->backsector)
{ // One sided line
return true;
}
DVector2 refpoint = FindRefPoint(ld, cres.Position);
FLineOpening open;
P_LineOpening(open, tmf.thing, ld, refpoint, &cres.Position, flags);
// adjust floor / ceiling heights
if (!(flags & FFCF_NOCEILING))
{
if (open.top < tmf.ceilingz)
{
tmf.ceilingz = open.top;
if (open.topsec != NULL) tmf.ceilingsector = open.topsec;
if (ffcf_verbose) Printf(" Adjust ceilingz to %f\n", open.top);
mit.StopUp();
}
}
// If we are stepping through a portal the line's opening must be checked, regardless of the NOFLOOR flag
if (!(flags & FFCF_NOFLOOR))
{
if (open.bottom > tmf.floorz)
{
tmf.floorz = open.bottom;
if (open.bottomsec != NULL) tmf.floorsector = open.bottomsec;
tmf.touchmidtex = open.touchmidtex;
tmf.abovemidtex = open.abovemidtex;
if (ffcf_verbose) Printf(" Adjust floorz to %f\n", open.bottom);
if (tmf.floorz > tmf.dropoffz + tmf.thing->MaxDropOffHeight) mit.StopDown();
}
else if (open.bottom == tmf.floorz)
{
tmf.touchmidtex |= open.touchmidtex;
tmf.abovemidtex |= open.abovemidtex;
}
if (open.lowfloor < tmf.dropoffz && open.lowfloor > LINEOPEN_MIN)
{
tmf.dropoffz = open.lowfloor;
if (ffcf_verbose) Printf(" Adjust dropoffz to %f\n", open.bottom);
if (tmf.floorz > tmf.dropoffz + tmf.thing->MaxDropOffHeight) mit.StopDown();
}
}
return true;
}
//==========================================================================
//
// calculates the actual floor and ceiling position at a given
// coordinate. Traverses through portals unless being told not to.
//
//==========================================================================
void P_GetFloorCeilingZ(FCheckPosition &tmf, int flags)
{
sector_t *sec = (!(flags & FFCF_SAMESECTOR) || tmf.thing->Sector == NULL)? P_PointInSector(tmf.pos) : tmf.sector;
F3DFloor *ffc, *fff;
tmf.ceilingz = sec->NextHighestCeilingAt(tmf.pos.X, tmf.pos.Y, tmf.pos.Z, tmf.pos.Z + tmf.thing->Height, flags, &tmf.ceilingsector, &ffc);
tmf.floorz = tmf.dropoffz = sec->NextLowestFloorAt(tmf.pos.X, tmf.pos.Y, tmf.pos.Z, flags, tmf.thing->MaxStepHeight, &tmf.floorsector, &fff);
if (fff)
{
tmf.floorpic = *fff->top.texture;
tmf.floorterrain = fff->model->GetTerrain(fff->top.isceiling);
}
else
{
tmf.floorpic = tmf.floorsector->GetTexture(sector_t::floor);
tmf.floorterrain = tmf.floorsector->GetTerrain(sector_t::floor);
}
tmf.ceilingpic = ffc ? *ffc->bottom.texture : tmf.ceilingsector->GetTexture(sector_t::ceiling);
tmf.sector = sec;
}
//==========================================================================
//
// P_FindFloorCeiling
//
//==========================================================================
void P_FindFloorCeiling(AActor *actor, int flags)
{
FCheckPosition tmf;
tmf.thing = actor;
tmf.pos = actor->Pos();
if (flags & FFCF_ONLYSPAWNPOS)
{
flags |= FFCF_3DRESTRICT;
}
if (flags & FFCF_SAMESECTOR)
{
tmf.sector = actor->Sector;
}
P_GetFloorCeilingZ(tmf, flags);
assert(tmf.thing->Sector != NULL);
actor->floorz = tmf.floorz;
actor->dropoffz = tmf.dropoffz;
actor->ceilingz = tmf.ceilingz;
actor->floorpic = tmf.floorpic;
actor->floorterrain = tmf.floorterrain;
actor->floorsector = tmf.floorsector;
actor->ceilingpic = tmf.ceilingpic;
actor->ceilingsector = tmf.ceilingsector;
if (ffcf_verbose) Printf("Starting with ceilingz = %f, floorz = %f\n", tmf.ceilingz, tmf.floorz);
tmf.touchmidtex = false;
tmf.abovemidtex = false;
validcount++;
FPortalGroupArray grouplist;
FMultiBlockLinesIterator mit(grouplist, actor);
FMultiBlockLinesIterator::CheckResult cres;
// if we already have a valid floor/ceiling sector within the current sector,
// we do not need to iterate through plane portals to find a floor or ceiling.
if (actor->floorsector == actor->Sector) mit.StopDown();
if (actor->ceilingsector == actor->Sector) mit.StopUp();
while ((mit.Next(&cres)))
{
PIT_FindFloorCeiling(mit, cres, mit.Box(), tmf, flags|cres.portalflags);
}
if (tmf.touchmidtex) tmf.dropoffz = tmf.floorz;
bool usetmf = !(flags & FFCF_ONLYSPAWNPOS) || (tmf.abovemidtex && (tmf.floorz <= actor->Z()));
// when actual floor or ceiling are beyond a portal plane we also need to use the result of the blockmap iterator, regardless of the flags being specified.
if (usetmf || tmf.floorsector->PortalGroup != actor->Sector->PortalGroup)
{
actor->floorz = tmf.floorz;
actor->dropoffz = tmf.dropoffz;
actor->floorpic = tmf.floorpic;
actor->floorterrain = tmf.floorterrain;
actor->floorsector = tmf.floorsector;
}
if (usetmf || tmf.ceilingsector->PortalGroup != actor->Sector->PortalGroup)
{
actor->ceilingz = tmf.ceilingz;
actor->ceilingpic = tmf.ceilingpic;
actor->ceilingsector = tmf.ceilingsector;
}
}
DEFINE_ACTION_FUNCTION(AActor, FindFloorCeiling)
{
PARAM_SELF_PROLOGUE(AActor);
PARAM_INT_DEF(flags);
P_FindFloorCeiling(self, flags);
return 0;
}
// Debug CCMD for checking errors in the MultiBlockLinesIterator (needs to be removed when this code is complete)
CCMD(ffcf)
{
ffcf_verbose = true;
P_FindFloorCeiling(players[0].mo, 0);
ffcf_verbose = false;
}
//==========================================================================
//
// TELEPORT MOVE
//
//
// P_TeleportMove
//
// [RH] Added telefrag parameter: When true, anything in the spawn spot
// will always be telefragged, and the move will be successful.
// Added z parameter. Originally, the thing's z was set *after* the
// move was made, so the height checking I added for 1.13 could
// potentially erroneously indicate the move was okay if the thing
// was being teleported between two non-overlapping height ranges.
//
//==========================================================================
bool P_TeleportMove(AActor* thing, const DVector3 &pos, bool telefrag, bool modifyactor)
{
FCheckPosition tmf;
sector_t *oldsec = thing->Sector;
// kill anything occupying the position
// The base floor/ceiling is from the subsector that contains the point.
// Any contacted lines the step closer together will adjust them.
tmf.thing = thing;
tmf.pos = pos;
tmf.touchmidtex = false;
tmf.abovemidtex = false;
P_GetFloorCeilingZ(tmf, 0);
spechit.Clear(); // this is needed so that no more specials get activated after crossing a teleporter.
bool StompAlwaysFrags = ((thing->flags2 & MF2_TELESTOMP) || (level.flags & LEVEL_MONSTERSTELEFRAG) || telefrag) && !(thing->flags7 & MF7_NOTELESTOMP);
// P_LineOpening requires the thing's z to be the destination z in order to work.
double savedz = thing->Z();
thing->SetZ(pos.Z);
sector_t *sector = P_PointInSector(pos);
FPortalGroupArray grouplist;
FMultiBlockLinesIterator mit(grouplist, pos.X, pos.Y, pos.Z, thing->Height, thing->radius, sector);
FMultiBlockLinesIterator::CheckResult cres;
while (mit.Next(&cres))
{
PIT_FindFloorCeiling(mit, cres, mit.Box(), tmf, 0);
}
thing->SetZ(savedz);
if (tmf.touchmidtex) tmf.dropoffz = tmf.floorz;
FMultiBlockThingsIterator mit2(grouplist, pos.X, pos.Y, pos.Z, thing->Height, thing->radius, false, sector);
FMultiBlockThingsIterator::CheckResult cres2;
while (mit2.Next(&cres2))
{
AActor *th = cres2.thing;
if (!(th->flags & MF_SHOOTABLE))
continue;
// don't clip against self
if (th == thing)
continue;
double blockdist = th->radius + tmf.thing->radius;
if (fabs(th->X() - cres2.Position.X) >= blockdist || fabs(th->Y() - cres2.Position.Y) >= blockdist)
continue;
if ((th->flags2 | tmf.thing->flags2) & MF2_THRUACTORS)
continue;
if (tmf.thing->flags6 & MF6_THRUSPECIES && tmf.thing->GetSpecies() == th->GetSpecies())
continue;
// [RH] Z-Check
// But not if not MF2_PASSMOBJ or MF3_DONTOVERLAP are set!
// Otherwise those things would get stuck inside each other.
if ((thing->flags2 & MF2_PASSMOBJ || th->flags4 & MF4_ACTLIKEBRIDGE) && !(i_compatflags & COMPATF_NO_PASSMOBJ))
{
if (!(th->flags3 & thing->flags3 & MF3_DONTOVERLAP))
{
if (pos.Z > th->Top() || // overhead
pos.Z + thing->Height < th->Z()) // underneath
continue;
}
}
if (!P_CanCollideWith(tmf.thing, th))
continue;
// Don't let players and monsters block item teleports (all other actor types will still block.)
if (thing->IsKindOf(RUNTIME_CLASS(AInventory)) && !(thing->flags & MF_SOLID) && ((th->flags3 & MF3_ISMONSTER) || th->player != nullptr))
continue;
// monsters don't stomp things except on boss level
// [RH] Some Heretic/Hexen monsters can telestomp
// ... and some items can never be telefragged while others will be telefragged by everything that teleports upon them.
if ((StompAlwaysFrags && !(th->flags6 & MF6_NOTELEFRAG)) || (th->flags7 & MF7_ALWAYSTELEFRAG))
{
// Don't actually damage if predicting a teleport
if (thing->player == NULL || !(thing->player->cheats & CF_PREDICTING))
P_DamageMobj(th, thing, thing, TELEFRAG_DAMAGE, NAME_Telefrag, DMG_THRUSTLESS);
continue;
}
return false;
}
if (modifyactor)
{
// the move is ok, so link the thing into its new position
thing->SetOrigin(pos, false);
thing->floorz = tmf.floorz;
thing->ceilingz = tmf.ceilingz;
thing->floorsector = tmf.floorsector;
thing->floorpic = tmf.floorpic;
thing->floorterrain = tmf.floorterrain;
thing->ceilingsector = tmf.ceilingsector;
thing->ceilingpic = tmf.ceilingpic;
thing->dropoffz = tmf.dropoffz; // killough 11/98
thing->BlockingLine = NULL;
if (thing->flags2 & MF2_FLOORCLIP)
{
thing->AdjustFloorClip();
}
if (thing == players[consoleplayer].camera)
{
R_ResetViewInterpolation();
}
// If this teleport was caused by a move, P_TryMove() will handle the
// sector transition messages better than we can here.
// This needs to be compatibility optioned because some older maps exploited this missing feature.
if (!(thing->flags6 & MF6_INTRYMOVE) && !(i_compatflags2 & COMPATF2_TELEPORT))
{
thing->CheckSectorTransition(oldsec);
}
}
return true;
}
DEFINE_ACTION_FUNCTION(AActor, TeleportMove)
{
PARAM_SELF_PROLOGUE(AActor);
PARAM_FLOAT(x);
PARAM_FLOAT(y);
PARAM_FLOAT(z);
PARAM_BOOL(telefrag);
PARAM_BOOL_DEF(modify);
ACTION_RETURN_BOOL(P_TeleportMove(self, DVector3(x, y, z), telefrag, modify));
}
//==========================================================================
//
// [RH] P_PlayerStartStomp
//
// Like P_TeleportMove, but it doesn't move anything, and only monsters and other
// players get telefragged.
//
//==========================================================================
void P_PlayerStartStomp(AActor *actor, bool mononly)
{
FPortalGroupArray grouplist;
FMultiBlockThingsIterator mit(grouplist, actor);
FMultiBlockThingsIterator::CheckResult cres;
while ((mit.Next(&cres)))
{
AActor *th = cres.thing;
if (!(th->flags & MF_SHOOTABLE))
continue;
// don't clip against self, and don't kill your own voodoo dolls
if (th == actor || (th->player == actor->player && th->player != NULL))
continue;
double blockdist = th->radius + actor->radius;
if (fabs(th->X() - cres.Position.X) >= blockdist || fabs(th->Y() - cres.Position.Y) >= blockdist)
continue;
// only kill monsters and other players
if (th->player == NULL && !(th->flags3 & MF3_ISMONSTER))
continue;
if (th->player != NULL && mononly)
continue;
if (actor->Z() > th->Top())
continue; // overhead
if (actor->Top() < th->Z())
continue; // underneath
P_DamageMobj(th, actor, actor, TELEFRAG_DAMAGE, NAME_Telefrag);
}
}
//==========================================================================
//
// killough 8/28/98:
//
// P_GetFriction()
//
// Returns the friction associated with a particular mobj.
//
//==========================================================================
double P_GetFriction(const AActor *mo, double *frictionfactor)
{
double friction = ORIG_FRICTION;
double movefactor = ORIG_FRICTION_FACTOR;
double newfriction;
double newmf;
const msecnode_t *m;
sector_t *sec;
if (mo->IsNoClip2())
{
// The default values are fine for noclip2 mode
}
else if (mo->flags2 & MF2_FLY && mo->flags & MF_NOGRAVITY)
{
friction = FRICTION_FLY;
}
else if ((!(mo->flags & MF_NOGRAVITY) && mo->waterlevel > 1) ||
(mo->waterlevel == 1 && mo->Z() > mo->floorz+ 6))
{
friction = mo->Sector->GetFriction(sector_t::floor, &movefactor);
movefactor *= 0.5;
// Check 3D floors -- might be the source of the waterlevel
for (unsigned i = 0; i < mo->Sector->e->XFloor.ffloors.Size(); i++)
{
F3DFloor *rover = mo->Sector->e->XFloor.ffloors[i];
if (!(rover->flags & FF_EXISTS)) continue;
if (!(rover->flags & FF_SWIMMABLE)) continue;
if (mo->Z() > rover->top.plane->ZatPoint(mo) ||
mo->Z() < rover->bottom.plane->ZatPoint(mo))
continue;
newfriction = rover->model->GetFriction(rover->top.isceiling, &newmf);
if (newfriction < friction || friction == ORIG_FRICTION)
{
friction = newfriction;
movefactor = newmf * 0.5;
}
}
}
else if (var_friction && !(mo->flags & (MF_NOCLIP | MF_NOGRAVITY)))
{ // When the object is straddling sectors with the same
// floor height that have different frictions, use the lowest
// friction value (muddy has precedence over icy).
for (m = mo->touching_sectorlist; m; m = m->m_tnext)
{
sec = m->m_sector;
DVector3 pos = mo->PosRelative(sec);
// 3D floors must be checked, too
for (unsigned i = 0; i < sec->e->XFloor.ffloors.Size(); i++)
{
F3DFloor *rover = sec->e->XFloor.ffloors[i];
if (!(rover->flags & FF_EXISTS)) continue;
if (rover->flags & FF_SOLID)
{
// Must be standing on a solid floor
if (!mo->isAtZ(rover->top.plane->ZatPoint(pos))) continue;
}
else if (rover->flags & FF_SWIMMABLE)
{
// Or on or inside a swimmable floor (e.g. in shallow water)
if (mo->Z() > rover->top.plane->ZatPoint(pos) ||
(mo->Top()) < rover->bottom.plane->ZatPoint(pos))
continue;
}
else
continue;
newfriction = rover->model->GetFriction(rover->top.isceiling, &newmf);
if (newfriction < friction || friction == ORIG_FRICTION)
{
friction = newfriction;
movefactor = newmf;
}
}
if (!(sec->Flags & SECF_FRICTION) &&
Terrains[sec->GetTerrain(sector_t::floor)].Friction == 0)
{
continue;
}
newfriction = sec->GetFriction(sector_t::floor, &newmf);
if ((newfriction < friction || friction == ORIG_FRICTION) &&
(mo->Z() <= sec->floorplane.ZatPoint(pos) ||
(sec->GetHeightSec() != NULL &&
mo->Z() <= sec->heightsec->floorplane.ZatPoint(pos))))
{
friction = newfriction;
movefactor = newmf;
}
}
}
if (mo->Friction != 1)
{
friction = clamp((friction * mo->Friction), 0., 1.);
movefactor = FrictionToMoveFactor(friction);
}
if (frictionfactor)
*frictionfactor = movefactor;
return friction;
}
//==========================================================================
//
// phares 3/19/98
// P_GetMoveFactor() returns the value by which the x,y
// movements are multiplied to add to player movement.
//
// killough 8/28/98: rewritten
//
//==========================================================================
double P_GetMoveFactor(const AActor *mo, double *frictionp)
{
double movefactor, friction;
// If the floor is icy or muddy, it's harder to get moving. This is where
// the different friction factors are applied to 'trying to move'. In
// p_mobj.c, the friction factors are applied as you coast and slow down.
if ((friction = P_GetFriction(mo, &movefactor)) < ORIG_FRICTION)
{
// phares 3/11/98: you start off slowly, then increase as
// you get better footing
double velocity = mo->VelXYToSpeed();
if (velocity > MORE_FRICTION_VELOCITY * 4)
movefactor *= 8;
else if (velocity > MORE_FRICTION_VELOCITY * 2)
movefactor *= 4;
else if (velocity > MORE_FRICTION_VELOCITY)
movefactor *= 2;
}
if (frictionp)
*frictionp = friction;
return movefactor;
}
DEFINE_ACTION_FUNCTION(AActor, GetFriction)
{
PARAM_SELF_PROLOGUE(AActor);
double friction, movefactor = P_GetMoveFactor(self, &friction);
if (numret > 1)
{
numret = 2;
ret[1].SetFloat(movefactor);
}
if (numret > 0)
{
ret[0].SetFloat(friction);
}
return numret;
}
//==========================================================================
//
// Checks if the line intersects with the actor
// returns
// - 1 when above/below
// - 0 when intersecting
// - -1 when outside the portal
//
// Note that this check is done from the 'other' side of the portal
// so plane names seem to be inverted.
//
//==========================================================================
static int LineIsAbove(line_t *line, AActor *actor)
{
if (line->frontsector->PortalBlocksMovement(sector_t::floor)) return -1;
return line->frontsector->GetPortalPlaneZ(sector_t::floor) >= actor->Top();
}
static int LineIsBelow(line_t *line, AActor *actor)
{
if (line->frontsector->PortalBlocksMovement(sector_t::ceiling)) return -1;
return line->frontsector->GetPortalPlaneZ(sector_t::ceiling) <= actor->Z();
}
//
// MOVEMENT ITERATOR FUNCTIONS
//
//==========================================================================
//
//
// PIT_CheckLine
// Adjusts tmfloorz and tmceilingz as lines are contacted
//
//
//==========================================================================
static // killough 3/26/98: make static
bool PIT_CheckLine(FMultiBlockLinesIterator &mit, FMultiBlockLinesIterator::CheckResult &cres, const FBoundingBox &box, FCheckPosition &tm, const bool wasfit)
{
line_t *ld = cres.line;
bool rail = false;
if (!box.inRange(ld) || box.BoxOnLineSide(ld) != -1)
return true;
// A line has been hit
/*
=
= The moving thing's destination position will cross the given line.
= If this should not be allowed, return false.
= If the line is special, keep track of it to process later if the move
= is proven ok. NOTE: specials are NOT sorted by order, so two special lines
= that are only 8 pixels apart could be crossed in either order.
*/
if (!ld->backsector)
{ // One sided line
// Needed for polyobject portals.
if (cres.line->isLinePortal() && (cres.line->sidedef[0]->Flags & WALLF_POLYOBJ))
{
spechit_t spec;
spec.line = ld;
spec.Refpos = cres.Position;
spec.Oldrefpos = tm.thing->PosRelative(ld);
portalhit.Push(spec);
return true;
}
if (((cres.portalflags & FFCF_NOFLOOR) && LineIsAbove(cres.line, tm.thing) != 0) ||
((cres.portalflags & FFCF_NOCEILING) && LineIsBelow(cres.line, tm.thing) != 0))
{
// this blocking line is in a different vertical layer and does not intersect with the actor that is being checked.
// Since a one-sided line does not have an opening there's nothing left to do about it.
return true;
}
// check if the actor can step through the ceiling portal. In this case one-sided lines in the current area should not block
// Use the same rules for stepping through a portal as for non-portal case.
bool ismissile = (tm.thing->flags & MF_MISSILE) && !(tm.thing->flags6 & MF6_STEPMISSILE) && !(tm.thing->flags3 & MF3_FLOORHUGGER);
if (!ismissile && !cres.line->frontsector->PortalBlocksMovement(sector_t::ceiling))
{
double portz = cres.line->frontsector->GetPortalPlaneZ(sector_t::ceiling);
if (tm.thing->Z() < portz && tm.thing->Z() + tm.thing->MaxStepHeight >= portz && tm.floorz < portz)
{
if (wasfit)
{
tm.floorz = portz;
tm.floorsector = cres.line->frontsector;
tm.floorpic = cres.line->sidedef[0]->GetTexture(side_t::mid);
tm.floorterrain = 0;
tm.portalstep = true;
tm.portalgroup = cres.line->frontsector->GetOppositePortalGroup(sector_t::ceiling);
}
return true;
}
}
if (tm.thing->flags2 & MF2_BLASTED)
{
P_DamageMobj(tm.thing, NULL, NULL, tm.thing->Mass >> 5, NAME_Melee);
}
if (wasfit)
{
tm.thing->BlockingLine = ld;
}
CheckForPushSpecial(ld, 0, tm.thing);
return false;
}
// MBF bouncers are treated as missiles here.
bool Projectile = (tm.thing->flags & MF_MISSILE || tm.thing->BounceFlags & BOUNCE_MBF);
// MBF considers that friendly monsters are not blocked by monster-blocking lines.
// This is added here as a compatibility option. Note that monsters that are dehacked
// into being friendly with the MBF flag automatically gain MF3_NOBLOCKMONST, so this
// just optionally generalizes the behavior to other friendly monsters.
bool NotBlocked = ((tm.thing->flags3 & MF3_NOBLOCKMONST)
|| ((i_compatflags & COMPATF_NOBLOCKFRIENDS) && (tm.thing->flags & MF_FRIENDLY)));
uint32_t ProjectileBlocking = ML_BLOCKEVERYTHING | ML_BLOCKPROJECTILE;
if ( tm.thing->flags8 & MF8_BLOCKASPLAYER ) ProjectileBlocking |= ML_BLOCK_PLAYERS | ML_BLOCKING;
if (!(Projectile) || (ld->flags & ProjectileBlocking) )
{
if (ld->flags & ML_RAILING)
{
rail = true;
}
else if ((ld->flags & (ML_BLOCKING | ML_BLOCKEVERYTHING)) || // explicitly blocking everything
(!(NotBlocked) && (ld->flags & ML_BLOCKMONSTERS)) || // block monsters only
(((tm.thing->player != NULL) || (tm.thing->flags8 & MF8_BLOCKASPLAYER)) && (ld->flags & ML_BLOCK_PLAYERS)) || // block players
((Projectile) && (ld->flags & ML_BLOCKPROJECTILE)) || // block projectiles
((tm.thing->flags & MF_FLOAT) && (ld->flags & ML_BLOCK_FLOATERS))) // block floaters
{
if (cres.portalflags & FFCF_NOFLOOR)
{
int state = LineIsAbove(cres.line, tm.thing);
if (state == -1) return true;
if (state == 1)
{
if (wasfit)
{
// the line should not block but we should set the ceilingz to the portal boundary so that we can't float up into that line.
double portalz = cres.line->frontsector->GetPortalPlaneZ(sector_t::floor);
if (portalz < tm.ceilingz)
{
tm.ceilingz = portalz;
tm.ceilingsector = cres.line->frontsector;
}
}
return true;
}
}
else if (cres.portalflags & FFCF_NOCEILING)
{
// same, but for downward portals
int state = LineIsBelow(cres.line, tm.thing);
if (state == -1) return true;
if (state == 1)
{
if (wasfit)
{
double portalz = cres.line->frontsector->GetPortalPlaneZ(sector_t::ceiling);
if (portalz > tm.floorz)
{
tm.floorz = portalz;
tm.floorsector = cres.line->frontsector;
tm.floorterrain = 0;
}
}
return true;
}
}
else
{
if (tm.thing->flags2 & MF2_BLASTED)
{
P_DamageMobj(tm.thing, NULL, NULL, tm.thing->Mass >> 5, NAME_Melee);
}
if (wasfit)
{
tm.thing->BlockingLine = ld;
}
// Calculate line side based on the actor's original position, not the new one.
CheckForPushSpecial(ld, P_PointOnLineSide(cres.Position, ld), tm.thing);
return false;
}