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p_map.c
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p_map.c
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/* Emacs style mode select -*- C++ -*-
*-----------------------------------------------------------------------------
*
*
* PrBoom: a Doom port merged with LxDoom and LSDLDoom
* based on BOOM, a modified and improved DOOM engine
* Copyright (C) 1999 by
* id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
* Copyright (C) 1999-2004 by
* Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
* Copyright 2005, 2006 by
* Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* DESCRIPTION:
* Movement, collision handling.
* Shooting and aiming.
*
*-----------------------------------------------------------------------------*/
#include "doomstat.h"
#include "r_main.h"
#include "p_mobj.h"
#include "p_maputl.h"
#include "p_map.h"
#include "p_setup.h"
#include "p_spec.h"
#include "s_sound.h"
#include "sounds.h"
#include "p_inter.h"
#include "m_random.h"
#include "m_bbox.h"
#include "lprintf.h"
#include "m_argv.h"
#include "g_game.h"
#include "g_overflow.h"
#include "hu_tracers.h"
#include "e6y.h"//e6y
#include "dsda.h"
#include "heretic/def.h"
static mobj_t *tmthing;
static fixed_t tmx;
static fixed_t tmy;
static int pe_x; // Pain Elemental position for Lost Soul checks // phares
static int pe_y; // Pain Elemental position for Lost Soul checks // phares
static int ls_x; // Lost Soul position for Lost Soul checks // phares
static int ls_y; // Lost Soul position for Lost Soul checks // phares
//
// SECTOR HEIGHT CHANGING
// After modifying a sectors floor or ceiling height,
// call this routine to adjust the positions
// of all things that touch the sector.
//
// If anything doesn't fit anymore, true will be returned.
// If crunch is true, they will take damage
// as they are being crushed.
// If Crunch is false, you should set the sector height back
// the way it was and call P_ChangeSector again
// to undo the changes.
//
static dboolean crushchange, nofit;
// If "floatok" true, move would be ok
// if within "tmfloorz - tmceilingz".
dboolean floatok;
/* killough 11/98: if "felldown" true, object was pushed down ledge */
dboolean felldown;
// The tm* items are used to hold information globally, usually for
// line or object intersection checking
fixed_t tmbbox[4]; // bounding box for line intersection checks
fixed_t tmfloorz; // floor you'd hit if free to fall
fixed_t tmceilingz; // ceiling of sector you're in
fixed_t tmdropoffz; // dropoff on other side of line you're crossing
// keep track of the line that lowers the ceiling,
// so missiles don't explode against sky hack walls
line_t *ceilingline;
line_t *blockline; /* killough 8/11/98: blocking linedef */
line_t *floorline; /* killough 8/1/98: Highest touched floor */
static int tmunstuck; /* killough 8/1/98: whether to allow unsticking */
// keep track of special lines as they are hit,
// but don't process them until the move is proven valid
// 1/11/98 killough: removed limit on special lines crossed
line_t **spechit; // new code -- killough
static int spechit_max; // killough
int numspechit;
// Temporary holder for thing_sectorlist threads
msecnode_t* sector_list = NULL; // phares 3/16/98
//
// TELEPORT MOVE
//
//
// PIT_StompThing
//
static dboolean telefrag; /* killough 8/9/98: whether to telefrag at exit */
dboolean PIT_StompThing (mobj_t* thing)
{
fixed_t blockdist;
// phares 9/10/98: moved this self-check to start of routine
// don't clip against self
if (thing == tmthing)
return true;
if (!(thing->flags & MF_SHOOTABLE)) // Can't shoot it? Can't stomp it!
return true;
blockdist = thing->radius + tmthing->radius;
if (D_abs(thing->x - tmx) >= blockdist || D_abs(thing->y - tmy) >= blockdist)
return true; // didn't hit it
// monsters don't stomp things except on boss level
if (!telefrag && !(tmthing->flags2 & MF2_TELESTOMP)) // killough 8/9/98: make consistent across all levels
return false;
P_DamageMobj (thing, tmthing, tmthing, 10000); // Stomp!
return true;
}
/*
* killough 8/28/98:
*
* P_GetFriction()
*
* Returns the friction associated with a particular mobj.
*/
int P_GetFriction(const mobj_t *mo, int *frictionfactor)
{
int friction = ORIG_FRICTION;
int movefactor = ORIG_FRICTION_FACTOR;
const msecnode_t *m;
const sector_t *sec;
/* Assign the friction value to objects on the floor, non-floating,
* and clipped. Normally the object's friction value is kept at
* ORIG_FRICTION and this thinker changes it for icy or muddy floors.
*
* When the object is straddling sectors with the same
* floorheight that have different frictions, use the lowest
* friction value (muddy has precedence over icy).
*/
if (mo->flags & MF_FLY)
{
friction = FRICTION_FLY;
}
else
{
if (!(mo->flags & (MF_NOCLIP|MF_NOGRAVITY))
&& (mbf_features || (mo->player && !compatibility)) &&
variable_friction)
for (m = mo->touching_sectorlist; m; m = m->m_tnext)
if ((sec = m->m_sector)->special & FRICTION_MASK &&
(sec->friction < friction || friction == ORIG_FRICTION) &&
(mo->z <= sec->floorheight ||
(sec->heightsec != -1 &&
mo->z <= sectors[sec->heightsec].floorheight &&
mbf_features)))
friction = sec->friction, movefactor = sec->movefactor;
}
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
*/
int P_GetMoveFactor(mobj_t *mo, int *frictionp)
{
int movefactor, friction;
//e6y
if (!mbf_features && !prboom_comp[PC_PRBOOM_FRICTION].state)
{
int momentum;
movefactor = ORIG_FRICTION_FACTOR;
if (!compatibility && variable_friction &&
!(mo->flags & (MF_NOGRAVITY | MF_NOCLIP)))
{
friction = mo->friction;
if (friction == ORIG_FRICTION) // normal floor
;
else if (friction > ORIG_FRICTION) // ice
{
movefactor = mo->movefactor;
((mobj_t*)mo)->movefactor = ORIG_FRICTION_FACTOR; // reset
}
else // sludge
{
// phares 3/11/98: you start off slowly, then increase as
// you get better footing
momentum = (P_AproxDistance(mo->momx,mo->momy));
movefactor = mo->movefactor;
if (momentum > MORE_FRICTION_MOMENTUM<<2)
movefactor <<= 3;
else if (momentum > MORE_FRICTION_MOMENTUM<<1)
movefactor <<= 2;
else if (momentum > MORE_FRICTION_MOMENTUM)
movefactor <<= 1;
((mobj_t*)mo)->movefactor = ORIG_FRICTION_FACTOR; // reset
}
} // ^
return(movefactor); // |
}
// 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
int momentum = P_AproxDistance(mo->momx,mo->momy);
if (momentum > MORE_FRICTION_MOMENTUM<<2)
movefactor <<= 3;
else if (momentum > MORE_FRICTION_MOMENTUM<<1)
movefactor <<= 2;
else if (momentum > MORE_FRICTION_MOMENTUM)
movefactor <<= 1;
}
if (frictionp)
*frictionp = friction;
return movefactor;
}
//
// P_TeleportMove
//
dboolean P_TeleportMove (mobj_t* thing,fixed_t x,fixed_t y, dboolean boss)
{
int xl;
int xh;
int yl;
int yh;
int bx;
int by;
subsector_t* newsubsec;
/* killough 8/9/98: make telefragging more consistent, preserve compatibility */
telefrag = thing->player ||
(!comp[comp_telefrag] ? boss : (gamemap==30));
// kill anything occupying the position
tmthing = thing;
tmx = x;
tmy = y;
tmbbox[BOXTOP] = y + tmthing->radius;
tmbbox[BOXBOTTOM] = y - tmthing->radius;
tmbbox[BOXRIGHT] = x + tmthing->radius;
tmbbox[BOXLEFT] = x - tmthing->radius;
newsubsec = R_PointInSubsector (x,y);
ceilingline = NULL;
// The base floor/ceiling is from the subsector
// that contains the point.
// Any contacted lines the step closer together
// will adjust them.
tmfloorz = tmdropoffz = newsubsec->sector->floorheight;
tmceilingz = newsubsec->sector->ceilingheight;
validcount++;
numspechit = 0;
// stomp on any things contacted
xl = P_GetSafeBlockX(tmbbox[BOXLEFT] - bmaporgx - MAXRADIUS);
xh = P_GetSafeBlockX(tmbbox[BOXRIGHT] - bmaporgx + MAXRADIUS);
yl = P_GetSafeBlockY(tmbbox[BOXBOTTOM] - bmaporgy - MAXRADIUS);
yh = P_GetSafeBlockY(tmbbox[BOXTOP] - bmaporgy + MAXRADIUS);
for (bx=xl ; bx<=xh ; bx++)
for (by=yl ; by<=yh ; by++)
if (!P_BlockThingsIterator(bx,by,PIT_StompThing))
return false;
// the move is ok,
// so unlink from the old position & link into the new position
P_UnsetThingPosition (thing);
thing->floorz = tmfloorz;
thing->ceilingz = tmceilingz;
thing->dropoffz = tmdropoffz; // killough 11/98
thing->x = x;
thing->y = y;
P_SetThingPosition (thing);
thing->PrevX = x;
thing->PrevY = y;
thing->PrevZ = thing->floorz;
return true;
}
//
// MOVEMENT ITERATOR FUNCTIONS
//
// // phares
// PIT_CrossLine // |
// Checks to see if a PE->LS trajectory line crosses a blocking // V
// line. Returns false if it does.
//
// tmbbox holds the bounding box of the trajectory. If that box
// does not touch the bounding box of the line in question,
// then the trajectory is not blocked. If the PE is on one side
// of the line and the LS is on the other side, then the
// trajectory is blocked.
//
// Currently this assumes an infinite line, which is not quite
// correct. A more correct solution would be to check for an
// intersection of the trajectory and the line, but that takes
// longer and probably really isn't worth the effort.
//
static // killough 3/26/98: make static
dboolean PIT_CrossLine (line_t* ld)
{
if (!(ld->flags & ML_TWOSIDED) ||
(ld->flags & (ML_BLOCKING|ML_BLOCKMONSTERS)))
if (!(tmbbox[BOXLEFT] > ld->bbox[BOXRIGHT] ||
tmbbox[BOXRIGHT] < ld->bbox[BOXLEFT] ||
tmbbox[BOXTOP] < ld->bbox[BOXBOTTOM] ||
tmbbox[BOXBOTTOM] > ld->bbox[BOXTOP]))
if (P_PointOnLineSide(pe_x,pe_y,ld) != P_PointOnLineSide(ls_x,ls_y,ld))
return(false); // line blocks trajectory // ^
return(true); // line doesn't block trajectory // |
} // phares
/* killough 8/1/98: used to test intersection between thing and line
* assuming NO movement occurs -- used to avoid sticky situations.
*/
static int untouched(line_t *ld)
{
fixed_t x, y, tmbbox[4];
return
(tmbbox[BOXRIGHT] = (x=tmthing->x)+tmthing->radius) <= ld->bbox[BOXLEFT] ||
(tmbbox[BOXLEFT] = x-tmthing->radius) >= ld->bbox[BOXRIGHT] ||
(tmbbox[BOXTOP] = (y=tmthing->y)+tmthing->radius) <= ld->bbox[BOXBOTTOM] ||
(tmbbox[BOXBOTTOM] = y-tmthing->radius) >= ld->bbox[BOXTOP] ||
P_BoxOnLineSide(tmbbox, ld) != -1;
}
//
// PIT_CheckLine
// Adjusts tmfloorz and tmceilingz as lines are contacted
//
static // killough 3/26/98: make static
dboolean PIT_CheckLine (line_t* ld)
{
if (tmbbox[BOXRIGHT] <= ld->bbox[BOXLEFT]
|| tmbbox[BOXLEFT] >= ld->bbox[BOXRIGHT]
|| tmbbox[BOXTOP] <= ld->bbox[BOXBOTTOM]
|| tmbbox[BOXBOTTOM] >= ld->bbox[BOXTOP] )
return true; // didn't hit it
if (P_BoxOnLineSide(tmbbox, ld) != -1)
return true; // didn't hit it
// 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.
// killough 7/24/98: allow player to move out of 1s wall, to prevent sticking
if (!ld->backsector) // one sided line
{
if (heretic)
{
if (tmthing->flags & MF_MISSILE)
{ // Missiles can trigger impact specials
if (ld->special)
{
P_AppendSpecHit(ld);
}
}
}
blockline = ld;
return tmunstuck && !untouched(ld) &&
FixedMul(tmx-tmthing->x,ld->dy) > FixedMul(tmy-tmthing->y,ld->dx);
}
// killough 8/10/98: allow bouncing objects to pass through as missiles
if (!(tmthing->flags & (MF_MISSILE | MF_BOUNCES)))
{
// explicitly blocking everything
// or blocking player
if (ld->flags & ML_BLOCKING || (mbf21 && tmthing->player && ld->flags & ML_BLOCKPLAYERS))
return tmunstuck && !untouched(ld); // killough 8/1/98: allow escape
// killough 8/9/98: monster-blockers don't affect friends
if (
!(tmthing->flags & MF_FRIEND || tmthing->player) &&
(
ld->flags & ML_BLOCKMONSTERS ||
(mbf21 && ld->flags & ML_BLOCKLANDMONSTERS && !(tmthing->flags & MF_FLOAT))
) &&
tmthing->type != HERETIC_MT_POD
)
return false; // block monsters only
}
// set openrange, opentop, openbottom
// these define a 'window' from one sector to another across this line
P_LineOpening (ld);
// adjust floor & ceiling heights
if (opentop < tmceilingz)
{
tmceilingz = opentop;
ceilingline = ld;
blockline = ld;
}
if (openbottom > tmfloorz)
{
tmfloorz = openbottom;
floorline = ld; // killough 8/1/98: remember floor linedef
blockline = ld;
}
if (lowfloor < tmdropoffz)
tmdropoffz = lowfloor;
// if contacted a special line, add it to the list
CheckLinesCrossTracer(ld);//e6y
if (ld->special)
P_AppendSpecHit(ld);
return true;
}
//
// PIT_CheckThing
//
static dboolean P_ProjectileImmune(mobj_t *target, mobj_t *source)
{
return
( // PG_GROUPLESS means no immunity, even to own species
mobjinfo[target->type].projectile_group != PG_GROUPLESS ||
target == source
) &&
(
( // target type has default behaviour, and things are the same type
mobjinfo[target->type].projectile_group == PG_DEFAULT &&
source->type == target->type
) ||
( // target type has special behaviour, and things have the same group
mobjinfo[target->type].projectile_group != PG_DEFAULT &&
mobjinfo[target->type].projectile_group == mobjinfo[source->type].projectile_group
)
);
}
static dboolean PIT_CheckThing(mobj_t *thing) // killough 3/26/98: make static
{
fixed_t blockdist;
int damage;
// killough 11/98: add touchy things
if (!(thing->flags & (MF_SOLID|MF_SPECIAL|MF_SHOOTABLE|MF_TOUCHY)))
return true;
blockdist = thing->radius + tmthing->radius;
if (D_abs(thing->x - tmx) >= blockdist || D_abs(thing->y - tmy) >= blockdist)
return true; // didn't hit it
// killough 11/98:
//
// This test has less information content (it's almost always false), so it
// should not be moved up to first, as it adds more overhead than it removes.
// don't clip against self
if (thing == tmthing)
return true;
/* killough 11/98:
*
* TOUCHY flag, for mines or other objects which die on contact with solids.
* If a solid object of a different type comes in contact with a touchy
* thing, and the touchy thing is not the sole one moving relative to fixed
* surroundings such as walls, then the touchy thing dies immediately.
*/
if (thing->flags & MF_TOUCHY && // touchy object
tmthing->flags & MF_SOLID && // solid object touches it
thing->health > 0 && // touchy object is alive
(thing->intflags & MIF_ARMED || // Thing is an armed mine
sentient(thing)) && // ... or a sentient thing
(thing->type != tmthing->type || // only different species
thing->type == g_mt_player) && // ... or different players
thing->z + thing->height >= tmthing->z && // touches vertically
tmthing->z + tmthing->height >= thing->z &&
(thing->type ^ MT_PAIN) | // PEs and lost souls
(tmthing->type ^ MT_SKULL) && // are considered same
(thing->type ^ MT_SKULL) | // (but Barons & Knights
(tmthing->type ^ MT_PAIN)) // are intentionally not)
{
P_DamageMobj(thing, NULL, NULL, thing->health); // kill object
return true;
}
if (tmthing->flags2 & MF2_PASSMOBJ)
{ // check if a mobj passed over/under another object
if ((tmthing->type == HERETIC_MT_IMP || tmthing->type == HERETIC_MT_WIZARD)
&& (thing->type == HERETIC_MT_IMP || thing->type == HERETIC_MT_WIZARD))
{ // don't let imps/wizards fly over other imps/wizards
return false;
}
if (tmthing->z > thing->z + thing->height
&& !(thing->flags & MF_SPECIAL))
{
return (true);
}
else if (tmthing->z + tmthing->height < thing->z
&& !(thing->flags & MF_SPECIAL))
{ // under thing
return (true);
}
}
// check for skulls slamming into things
if (tmthing->flags & MF_SKULLFLY)
{
// A flying skull is smacking something.
// Determine damage amount, and the skull comes to a dead stop.
int new_state;
int damage = ((P_Random(pr_skullfly)%8)+1)*tmthing->info->damage;
P_DamageMobj (thing, tmthing, tmthing, damage);
tmthing->flags &= ~MF_SKULLFLY;
tmthing->momx = tmthing->momy = tmthing->momz = 0;
if (heretic)
new_state = tmthing->info->seestate;
else
new_state = tmthing->info->spawnstate;
P_SetMobjState (tmthing, new_state);
return false; // stop moving
}
// missiles can hit other things
// killough 8/10/98: bouncing non-solid things can hit other things too
if (tmthing->flags & MF_MISSILE ||
(tmthing->flags & MF_BOUNCES && !(tmthing->flags & MF_SOLID)))
{
// Check for passing through a ghost
if ((thing->flags & MF_SHADOW) && (tmthing->flags2 & MF2_THRUGHOST))
{
return (true);
}
// see if it went over / under
if (tmthing->z > thing->z + thing->height)
return true; // overhead
if (tmthing->z + tmthing->height < thing->z)
return true; // underneath
if (tmthing->target && P_ProjectileImmune(thing, tmthing->target))
{
if (thing == tmthing->target)
return true; // Don't hit self.
else
// e6y: Dehacked support - monsters infight
if (thing->type != g_mt_player && !monsters_infight) // Explode, but do no damage.
return false; // Let players missile other players.
}
// killough 8/10/98: if moving thing is not a missile, no damage
// is inflicted, and momentum is reduced if object hit is solid.
if (!(tmthing->flags & MF_MISSILE)) {
if (!(thing->flags & MF_SOLID))
{
return true;
}
else
{
tmthing->momx = -tmthing->momx;
tmthing->momy = -tmthing->momy;
if (!(tmthing->flags & MF_NOGRAVITY))
{
tmthing->momx >>= 2;
tmthing->momy >>= 2;
}
return false;
}
}
if (!(thing->flags & MF_SHOOTABLE))
return !(thing->flags & MF_SOLID); // didn't do any damage
if (tmthing->flags2 & MF2_RIP)
{
if (heretic)
{
if (!(thing->flags & MF_NOBLOOD))
{ // Ok to spawn some blood
P_RipperBlood(tmthing);
}
S_StartSound(tmthing, heretic_sfx_ripslop);
damage = ((P_Random(pr_heretic) & 3) + 2) * tmthing->damage;
}
else
{
damage = ((P_Random(pr_mbf21) & 3) + 2) * tmthing->info->damage;
if (!(thing->flags & MF_NOBLOOD))
P_SpawnBlood(tmthing->x, tmthing->y, tmthing->z, damage);
if (tmthing->info->ripsound)
S_StartSound(tmthing, tmthing->info->ripsound);
}
P_DamageMobj(thing, tmthing, tmthing->target, damage);
if (thing->flags2 & MF2_PUSHABLE && !(tmthing->flags2 & MF2_CANNOTPUSH))
{ // Push thing
thing->momx += tmthing->momx >> 2;
thing->momy += tmthing->momy >> 2;
}
numspechit = 0;
return (true);
}
// damage / explode
damage = heretic ? tmthing->damage : tmthing->info->damage;
damage = ((P_Random(pr_damage) % 8) + 1) * damage;
if (heretic && damage && !(thing->flags & MF_NOBLOOD) && P_Random(pr_heretic) < 192)
{
P_BloodSplatter(tmthing->x, tmthing->y, tmthing->z, thing);
}
if (!heretic || damage)
P_DamageMobj(thing, tmthing, tmthing->target, damage);
// don't traverse any more
return false;
}
if (thing->flags2 & MF2_PUSHABLE && !(tmthing->flags2 & MF2_CANNOTPUSH))
{ // Push thing
thing->momx += tmthing->momx >> 2;
thing->momy += tmthing->momy >> 2;
}
// check for special pickup
if (thing->flags & MF_SPECIAL)
{
uint_64_t solid = thing->flags & MF_SOLID;
if (tmthing->flags & MF_PICKUP)
P_TouchSpecialThing(thing, tmthing); // can remove thing
return !solid;
}
// RjY
// comperr_hangsolid, an attempt to handle blocking hanging bodies
// A solid hanging body will allow sufficiently small things underneath it.
if (comperr(comperr_hangsolid) &&
!((~thing->flags) & (MF_SOLID | MF_SPAWNCEILING)) // solid and hanging
// invert everything, then both bits should be clear
&& tmthing->z + tmthing->height <= thing->z) // head height <= base
// top of thing trying to move under the body <= bottom of body
{
tmceilingz = thing->z; // pretend ceiling height is at body's base
return true;
}
// killough 3/16/98: Allow non-solid moving objects to move through solid
// ones, by allowing the moving thing (tmthing) to move if it's non-solid,
// despite another solid thing being in the way.
// killough 4/11/98: Treat no-clipping things as not blocking
// ...but not in demo_compatibility mode
// e6y
// Correction of wrong return value with demo_compatibility.
// There is no more synch on http://www.doomworld.com/sda/dwdemo/w303-115.zip
// (with correction in setMobjInfoValue)
if (demo_compatibility && !prboom_comp[PC_TREAT_NO_CLIPPING_THINGS_AS_NOT_BLOCKING].state)
return !(thing->flags & MF_SOLID);
else
return !((thing->flags & MF_SOLID && !(thing->flags & MF_NOCLIP))
&& (tmthing->flags & MF_SOLID || demo_compatibility));
// return !(thing->flags & MF_SOLID); // old code -- killough
}
// This routine checks for Lost Souls trying to be spawned // phares
// across 1-sided lines, impassible lines, or "monsters can't // |
// cross" lines. Draw an imaginary line between the PE // V
// and the new Lost Soul spawn spot. If that line crosses
// a 'blocking' line, then disallow the spawn. Only search
// lines in the blocks of the blockmap where the bounding box
// of the trajectory line resides. Then check bounding box
// of the trajectory vs. the bounding box of each blocking
// line to see if the trajectory and the blocking line cross.
// Then check the PE and LS to see if they're on different
// sides of the blocking line. If so, return true, otherwise
// false.
dboolean Check_Sides(mobj_t* actor, int x, int y)
{
int bx,by,xl,xh,yl,yh;
pe_x = actor->x;
pe_y = actor->y;
ls_x = x;
ls_y = y;
// Here is the bounding box of the trajectory
tmbbox[BOXLEFT] = pe_x < x ? pe_x : x;
tmbbox[BOXRIGHT] = pe_x > x ? pe_x : x;
tmbbox[BOXTOP] = pe_y > y ? pe_y : y;
tmbbox[BOXBOTTOM] = pe_y < y ? pe_y : y;
// Determine which blocks to look in for blocking lines
xl = P_GetSafeBlockX(tmbbox[BOXLEFT] - bmaporgx);
xh = P_GetSafeBlockX(tmbbox[BOXRIGHT] - bmaporgx);
yl = P_GetSafeBlockY(tmbbox[BOXBOTTOM] - bmaporgy);
yh = P_GetSafeBlockY(tmbbox[BOXTOP] - bmaporgy);
// xl->xh, yl->yh determine the mapblock set to search
validcount++; // prevents checking same line twice
for (bx = xl ; bx <= xh ; bx++)
for (by = yl ; by <= yh ; by++)
if (!P_BlockLinesIterator(bx,by,PIT_CrossLine))
return true; // ^
return(false); // |
} // phares
//
// MOVEMENT CLIPPING
//
//
// P_CheckPosition
// This is purely informative, nothing is modified
// (except things picked up).
//
// in:
// a mobj_t (can be valid or invalid)
// a position to be checked
// (doesn't need to be related to the mobj_t->x,y)
//
// during:
// special things are touched if MF_PICKUP
// early out on solid lines?
//
// out:
// newsubsec
// floorz
// ceilingz
// tmdropoffz
// the lowest point contacted
// (monsters won't move to a dropoff)
// speciallines[]
// numspeciallines
//
dboolean P_CheckPosition (mobj_t* thing,fixed_t x,fixed_t y)
{
int xl;
int xh;
int yl;
int yh;
int bx;
int by;
subsector_t* newsubsec;
tmthing = thing;
tmx = x;
tmy = y;
tmbbox[BOXTOP] = y + tmthing->radius;
tmbbox[BOXBOTTOM] = y - tmthing->radius;
tmbbox[BOXRIGHT] = x + tmthing->radius;
tmbbox[BOXLEFT] = x - tmthing->radius;
newsubsec = R_PointInSubsector (x,y);
floorline = blockline = ceilingline = NULL; // killough 8/1/98
// Whether object can get out of a sticky situation:
tmunstuck = thing->player && /* only players */
thing->player->mo == thing && /* not voodoo dolls */
mbf_features; /* not under old demos */
// The base floor / ceiling is from the subsector
// that contains the point.
// Any contacted lines the step closer together
// will adjust them.
tmfloorz = tmdropoffz = newsubsec->sector->floorheight;
tmceilingz = newsubsec->sector->ceilingheight;
validcount++;
numspechit = 0;
if ( tmthing->flags & MF_NOCLIP )
return true;
// Check things first, possibly picking things up.
// The bounding box is extended by MAXRADIUS
// because mobj_ts are grouped into mapblocks
// based on their origin point, and can overlap
// into adjacent blocks by up to MAXRADIUS units.
xl = P_GetSafeBlockX(tmbbox[BOXLEFT] - bmaporgx - MAXRADIUS);
xh = P_GetSafeBlockX(tmbbox[BOXRIGHT] - bmaporgx + MAXRADIUS);
yl = P_GetSafeBlockY(tmbbox[BOXBOTTOM] - bmaporgy - MAXRADIUS);
yh = P_GetSafeBlockY(tmbbox[BOXTOP] - bmaporgy + MAXRADIUS);
for (bx=xl ; bx<=xh ; bx++)
for (by=yl ; by<=yh ; by++)
if (!P_BlockThingsIterator(bx,by,PIT_CheckThing))
return false;
// check lines
xl = P_GetSafeBlockX(tmbbox[BOXLEFT] - bmaporgx);
xh = P_GetSafeBlockX(tmbbox[BOXRIGHT] - bmaporgx);
yl = P_GetSafeBlockY(tmbbox[BOXBOTTOM] - bmaporgy);
yh = P_GetSafeBlockY(tmbbox[BOXTOP] - bmaporgy);
// heretic - this must be incremented before iterating over the lines
validcount++;
for (bx=xl ; bx<=xh ; bx++)
for (by=yl ; by<=yh ; by++)
if (!P_BlockLinesIterator (bx,by,PIT_CheckLine))
return false; // doesn't fit
ClearLinesCrossTracer();//e6y
return true;
}
//
// P_TryMove
// Attempt to move to a new position,
// crossing special lines unless MF_TELEPORT is set.
//
dboolean P_TryMove(mobj_t* thing,fixed_t x,fixed_t y,
dboolean dropoff) // killough 3/15/98: allow dropoff as option
{
fixed_t oldx;
fixed_t oldy;
felldown = floatok = false; // killough 11/98
if (!P_CheckPosition(thing, x, y))
{ // Solid wall or thing
CheckMissileImpact(thing);
return false;
}
if (!(thing->flags & MF_NOCLIP))
{
if (thing->flags & MF_FLY)
{
// When flying, slide up or down blocking lines until the actor
// is not blocked.
if (thing->z+thing->height > tmceilingz)
{
thing->momz = -8*FRACUNIT;
return false;
}
else if (thing->z < tmfloorz && tmfloorz-tmdropoffz > 24*FRACUNIT)
{
thing->momz = 8*FRACUNIT;
return false;
}
}
// killough 7/26/98: reformatted slightly
// killough 8/1/98: Possibly allow escape if otherwise stuck
if (
tmceilingz - tmfloorz < thing->height || // doesn't fit
// mobj must lower to fit
(
floatok = true,
!(thing->flags & MF_TELEPORT) &&
tmceilingz - thing->z < thing->height &&
!(thing->flags & MF_FLY) &&
!(thing->flags2 & MF2_FLY)
)
)
{
CheckMissileImpact(thing);
return tmunstuck
&& !(ceilingline && untouched(ceilingline))
&& !( floorline && untouched( floorline));
}
if (thing->flags2 & MF2_FLY)
{
if (thing->z + thing->height > tmceilingz)
{
thing->momz = -8 * FRACUNIT;
return false;
}
else if (thing->z < tmfloorz
&& tmfloorz - tmdropoffz > 24 * FRACUNIT)
{
thing->momz = 8 * FRACUNIT;
return false;
}
}
if (
!(thing->flags & MF_TELEPORT) &&