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v4k-git-backup/demos/ports/doom/src/p_map.c

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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
// Movement, collision handling.
// Shooting and aiming.
//
//-----------------------------------------------------------------------------
#include "doom_config.h"
#include "m_bbox.h"
#include "m_random.h"
#include "i_system.h"
#include "doomdef.h"
#include "p_local.h"
#include "s_sound.h"
#include "doomstat.h" // State.
#include "r_state.h" // State.
#include "sounds.h" // Data.
#define MAXSPECIALCROSS 8
fixed_t tmbbox[4];
mobj_t* tmthing;
int tmflags;
fixed_t tmx;
fixed_t tmy;
// If "floatok" true, move would be ok
// if within "tmfloorz - tmceilingz".
doom_boolean floatok;
fixed_t tmfloorz;
fixed_t tmceilingz;
fixed_t tmdropoffz;
// keep track of the line that lowers the ceiling,
// so missiles don't explode against sky hack walls
line_t* ceilingline;
// keep track of special lines as they are hit,
// but don't process them until the move is proven valid
line_t* spechit[MAXSPECIALCROSS];
int numspechit;
mobj_t* linetarget; // who got hit (or 0)
mobj_t* shootthing;
// Height if not aiming up or down
// ???: use slope for monsters?
fixed_t shootz;
int la_damage;
fixed_t attackrange;
fixed_t aimslope;
mobj_t* usething;
doom_boolean crushchange;
doom_boolean nofit;
// slopes to top and bottom of target
extern fixed_t topslope;
extern fixed_t bottomslope;
//
// TELEPORT MOVE
//
//
// PIT_StompThing
//
doom_boolean PIT_StompThing(mobj_t* thing)
{
fixed_t blockdist;
if (!(thing->flags & MF_SHOOTABLE))
return true;
blockdist = thing->radius + tmthing->radius;
if (doom_abs(thing->x - tmx) >= blockdist
|| doom_abs(thing->y - tmy) >= blockdist)
{
// didn't hit it
return true;
}
// don't clip against self
if (thing == tmthing)
return true;
// monsters don't stomp things except on boss level
if (!tmthing->player && gamemap != 30)
return false;
P_DamageMobj(thing, tmthing, tmthing, 10000);
return true;
}
//
// P_TeleportMove
//
doom_boolean P_TeleportMove(mobj_t* thing, fixed_t x, fixed_t y)
{
int xl;
int xh;
int yl;
int yh;
int bx;
int by;
subsector_t* newsubsec;
// kill anything occupying the position
tmthing = thing;
tmflags = thing->flags;
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 = 0;
// 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 = (tmbbox[BOXLEFT] - bmaporgx - MAXRADIUS) >> MAPBLOCKSHIFT;
xh = (tmbbox[BOXRIGHT] - bmaporgx + MAXRADIUS) >> MAPBLOCKSHIFT;
yl = (tmbbox[BOXBOTTOM] - bmaporgy - MAXRADIUS) >> MAPBLOCKSHIFT;
yh = (tmbbox[BOXTOP] - bmaporgy + MAXRADIUS) >> MAPBLOCKSHIFT;
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 link the thing into its new position
P_UnsetThingPosition(thing);
thing->floorz = tmfloorz;
thing->ceilingz = tmceilingz;
thing->x = x;
thing->y = y;
P_SetThingPosition(thing);
return true;
}
//
// MOVEMENT ITERATOR FUNCTIONS
//
//
// PIT_CheckLine
// Adjusts tmfloorz and tmceilingz as lines are contacted
//
doom_boolean 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;
if (P_BoxOnLineSide(tmbbox, 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)
return false; // one sided line
if (!(tmthing->flags & MF_MISSILE))
{
if (ld->flags & ML_BLOCKING)
return false; // explicitly blocking everything
if (!tmthing->player && ld->flags & ML_BLOCKMONSTERS)
return false; // block monsters only
}
// set openrange, opentop, openbottom
P_LineOpening(ld);
// adjust floor / ceiling heights
if (opentop < tmceilingz)
{
tmceilingz = opentop;
ceilingline = ld;
}
if (openbottom > tmfloorz)
tmfloorz = openbottom;
if (lowfloor < tmdropoffz)
tmdropoffz = lowfloor;
// if contacted a special line, add it to the list
if (ld->special)
{
spechit[numspechit] = ld;
numspechit++;
}
return true;
}
//
// PIT_CheckThing
//
doom_boolean PIT_CheckThing(mobj_t* thing)
{
fixed_t blockdist;
doom_boolean solid;
int damage;
if (!(thing->flags & (MF_SOLID | MF_SPECIAL | MF_SHOOTABLE)))
return true;
blockdist = thing->radius + tmthing->radius;
if (doom_abs(thing->x - tmx) >= blockdist
|| doom_abs(thing->y - tmy) >= blockdist)
{
// didn't hit it
return true;
}
// don't clip against self
if (thing == tmthing)
return true;
// check for skulls slamming into things
if (tmthing->flags & MF_SKULLFLY)
{
damage = ((P_Random() % 8) + 1) * tmthing->info->damage;
P_DamageMobj(thing, tmthing, tmthing, damage);
tmthing->flags &= ~MF_SKULLFLY;
tmthing->momx = tmthing->momy = tmthing->momz = 0;
P_SetMobjState(tmthing, tmthing->info->spawnstate);
return false; // stop moving
}
// missiles can hit other things
if (tmthing->flags & MF_MISSILE)
{
// 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 && (
tmthing->target->type == thing->type ||
(tmthing->target->type == MT_KNIGHT && thing->type == MT_BRUISER) ||
(tmthing->target->type == MT_BRUISER && thing->type == MT_KNIGHT)))
{
// Don't hit same species as originator.
if (thing == tmthing->target)
return true;
if (thing->type != MT_PLAYER)
{
// Explode, but do no damage.
// Let players missile other players.
return false;
}
}
if (!(thing->flags & MF_SHOOTABLE))
{
// didn't do any damage
return !(thing->flags & MF_SOLID);
}
// damage / explode
damage = ((P_Random() % 8) + 1) * tmthing->info->damage;
P_DamageMobj(thing, tmthing, tmthing->target, damage);
// don't traverse any more
return false;
}
// check for special pickup
if (thing->flags & MF_SPECIAL)
{
solid = thing->flags & MF_SOLID;
if (tmflags & MF_PICKUP)
{
// can remove thing
P_TouchSpecialThing(thing, tmthing);
}
return !solid;
}
return !(thing->flags & MF_SOLID);
}
//
// 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
//
doom_boolean 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;
tmflags = thing->flags;
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 = 0;
// 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 (tmflags & 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 = (tmbbox[BOXLEFT] - bmaporgx - MAXRADIUS) >> MAPBLOCKSHIFT;
xh = (tmbbox[BOXRIGHT] - bmaporgx + MAXRADIUS) >> MAPBLOCKSHIFT;
yl = (tmbbox[BOXBOTTOM] - bmaporgy - MAXRADIUS) >> MAPBLOCKSHIFT;
yh = (tmbbox[BOXTOP] - bmaporgy + MAXRADIUS) >> MAPBLOCKSHIFT;
for (bx = xl; bx <= xh; bx++)
for (by = yl; by <= yh; by++)
if (!P_BlockThingsIterator(bx, by, PIT_CheckThing))
return false;
// check lines
xl = (tmbbox[BOXLEFT] - bmaporgx) >> MAPBLOCKSHIFT;
xh = (tmbbox[BOXRIGHT] - bmaporgx) >> MAPBLOCKSHIFT;
yl = (tmbbox[BOXBOTTOM] - bmaporgy) >> MAPBLOCKSHIFT;
yh = (tmbbox[BOXTOP] - bmaporgy) >> MAPBLOCKSHIFT;
for (bx = xl; bx <= xh; bx++)
for (by = yl; by <= yh; by++)
if (!P_BlockLinesIterator(bx, by, PIT_CheckLine))
return false;
return true;
}
//
// P_TryMove
// Attempt to move to a new position,
// crossing special lines unless MF_TELEPORT is set.
//
doom_boolean P_TryMove(mobj_t* thing, fixed_t x, fixed_t y)
{
fixed_t oldx;
fixed_t oldy;
int side;
int oldside;
line_t* ld;
floatok = false;
if (!P_CheckPosition(thing, x, y))
return false; // solid wall or thing
if (!(thing->flags & MF_NOCLIP))
{
if (tmceilingz - tmfloorz < thing->height)
return false; // doesn't fit
floatok = true;
if (!(thing->flags & MF_TELEPORT)
&& tmceilingz - thing->z < thing->height)
return false; // mobj must lower itself to fit
if (!(thing->flags & MF_TELEPORT)
&& tmfloorz - thing->z > 24 * FRACUNIT)
return false; // too big a step up
if (!(thing->flags & (MF_DROPOFF | MF_FLOAT))
&& tmfloorz - tmdropoffz > 24 * FRACUNIT)
return false; // don't stand over a dropoff
}
// the move is ok,
// so link the thing into its new position
P_UnsetThingPosition(thing);
oldx = thing->x;
oldy = thing->y;
thing->floorz = tmfloorz;
thing->ceilingz = tmceilingz;
thing->x = x;
thing->y = y;
P_SetThingPosition(thing);
// if any special lines were hit, do the effect
if (!(thing->flags & (MF_TELEPORT | MF_NOCLIP)))
{
while (numspechit--)
{
// see if the line was crossed
ld = spechit[numspechit];
side = P_PointOnLineSide(thing->x, thing->y, ld);
oldside = P_PointOnLineSide(oldx, oldy, ld);
if (side != oldside)
{
if (ld->special)
P_CrossSpecialLine((int)(ld - lines), oldside, thing);
}
}
}
return true;
}
//
// P_ThingHeightClip
// Takes a valid thing and adjusts the thing->floorz,
// thing->ceilingz, and possibly thing->z.
// This is called for all nearby monsters
// whenever a sector changes height.
// If the thing doesn't fit,
// the z will be set to the lowest value
// and false will be returned.
//
doom_boolean P_ThingHeightClip(mobj_t* thing)
{
doom_boolean onfloor;
onfloor = (thing->z == thing->floorz);
P_CheckPosition(thing, thing->x, thing->y);
// what about stranding a monster partially off an edge?
thing->floorz = tmfloorz;
thing->ceilingz = tmceilingz;
if (onfloor)
{
// walking monsters rise and fall with the floor
thing->z = thing->floorz;
}
else
{
// don't adjust a floating monster unless forced to
if (thing->z + thing->height > thing->ceilingz)
thing->z = thing->ceilingz - thing->height;
}
if (thing->ceilingz - thing->floorz < thing->height)
return false;
return true;
}
//
// SLIDE MOVE
// Allows the player to slide along any angled walls.
//
fixed_t bestslidefrac;
fixed_t secondslidefrac;
line_t* bestslideline;
line_t* secondslideline;
mobj_t* slidemo;
fixed_t tmxmove;
fixed_t tmymove;
//
// P_HitSlideLine
// Adjusts the xmove / ymove
// so that the next move will slide along the wall.
//
void P_HitSlideLine(line_t* ld)
{
int side;
angle_t lineangle;
angle_t moveangle;
angle_t deltaangle;
fixed_t movelen;
fixed_t newlen;
if (ld->slopetype == ST_HORIZONTAL)
{
tmymove = 0;
return;
}
if (ld->slopetype == ST_VERTICAL)
{
tmxmove = 0;
return;
}
side = P_PointOnLineSide(slidemo->x, slidemo->y, ld);
lineangle = R_PointToAngle2(0, 0, ld->dx, ld->dy);
if (side == 1)
lineangle += ANG180;
moveangle = R_PointToAngle2(0, 0, tmxmove, tmymove);
deltaangle = moveangle - lineangle;
if (deltaangle > ANG180)
deltaangle += ANG180;
lineangle >>= ANGLETOFINESHIFT;
deltaangle >>= ANGLETOFINESHIFT;
movelen = P_AproxDistance(tmxmove, tmymove);
newlen = FixedMul(movelen, finecosine[deltaangle]);
tmxmove = FixedMul(newlen, finecosine[lineangle]);
tmymove = FixedMul(newlen, finesine[lineangle]);
}
//
// PTR_SlideTraverse
//
doom_boolean PTR_SlideTraverse(intercept_t* in)
{
line_t* li;
if (!in->isaline)
I_Error("Error: PTR_SlideTraverse: not a line?");
li = in->d.line;
if (!(li->flags & ML_TWOSIDED))
{
if (P_PointOnLineSide(slidemo->x, slidemo->y, li))
{
// don't hit the back side
return true;
}
goto isblocking;
}
// set openrange, opentop, openbottom
P_LineOpening(li);
if (openrange < slidemo->height)
goto isblocking; // doesn't fit
if (opentop - slidemo->z < slidemo->height)
goto isblocking; // mobj is too high
if (openbottom - slidemo->z > 24 * FRACUNIT)
goto isblocking; // too big a step up
// this line doesn't block movement
return true;
// the line does block movement,
// see if it is closer than best so far
isblocking:
if (in->frac < bestslidefrac)
{
secondslidefrac = bestslidefrac;
secondslideline = bestslideline;
bestslidefrac = in->frac;
bestslideline = li;
}
return false; // stop
}
//
// P_SlideMove
// The momx / momy move is bad, so try to slide
// along a wall.
// Find the first line hit, move flush to it,
// and slide along it
//
// This is a kludgy mess.
//
void P_SlideMove(mobj_t* mo)
{
fixed_t leadx;
fixed_t leady;
fixed_t trailx;
fixed_t traily;
fixed_t newx;
fixed_t newy;
int hitcount;
slidemo = mo;
hitcount = 0;
retry:
if (++hitcount == 3)
goto stairstep; // don't loop forever
// trace along the three leading corners
if (mo->momx > 0)
{
leadx = mo->x + mo->radius;
trailx = mo->x - mo->radius;
}
else
{
leadx = mo->x - mo->radius;
trailx = mo->x + mo->radius;
}
if (mo->momy > 0)
{
leady = mo->y + mo->radius;
traily = mo->y - mo->radius;
}
else
{
leady = mo->y - mo->radius;
traily = mo->y + mo->radius;
}
bestslidefrac = FRACUNIT + 1;
P_PathTraverse(leadx, leady, leadx + mo->momx, leady + mo->momy,
PT_ADDLINES, PTR_SlideTraverse);
P_PathTraverse(trailx, leady, trailx + mo->momx, leady + mo->momy,
PT_ADDLINES, PTR_SlideTraverse);
P_PathTraverse(leadx, traily, leadx + mo->momx, traily + mo->momy,
PT_ADDLINES, PTR_SlideTraverse);
// move up to the wall
if (bestslidefrac == FRACUNIT + 1)
{
// the move most have hit the middle, so stairstep
stairstep:
if (!P_TryMove(mo, mo->x, mo->y + mo->momy))
P_TryMove(mo, mo->x + mo->momx, mo->y);
return;
}
// fudge a bit to make sure it doesn't hit
bestslidefrac -= 0x800;
if (bestslidefrac > 0)
{
newx = FixedMul(mo->momx, bestslidefrac);
newy = FixedMul(mo->momy, bestslidefrac);
if (!P_TryMove(mo, mo->x + newx, mo->y + newy))
goto stairstep;
}
// Now continue along the wall.
// First calculate remainder.
bestslidefrac = FRACUNIT - (bestslidefrac + 0x800);
if (bestslidefrac > FRACUNIT)
bestslidefrac = FRACUNIT;
if (bestslidefrac <= 0)
return;
tmxmove = FixedMul(mo->momx, bestslidefrac);
tmymove = FixedMul(mo->momy, bestslidefrac);
P_HitSlideLine(bestslideline); // clip the moves
mo->momx = tmxmove;
mo->momy = tmymove;
if (!P_TryMove(mo, mo->x + tmxmove, mo->y + tmymove))
{
goto retry;
}
}
//
// P_LineAttack
//
//
// PTR_AimTraverse
// Sets linetaget and aimslope when a target is aimed at.
//
doom_boolean
PTR_AimTraverse(intercept_t* in)
{
line_t* li;
mobj_t* th;
fixed_t slope;
fixed_t thingtopslope;
fixed_t thingbottomslope;
fixed_t dist;
if (in->isaline)
{
li = in->d.line;
if (!(li->flags & ML_TWOSIDED))
return false; // stop
// Crosses a two sided line.
// A two sided line will restrict
// the possible target ranges.
P_LineOpening(li);
if (openbottom >= opentop)
return false; // stop
dist = FixedMul(attackrange, in->frac);
if (li->frontsector->floorheight != li->backsector->floorheight)
{
slope = FixedDiv(openbottom - shootz, dist);
if (slope > bottomslope)
bottomslope = slope;
}
if (li->frontsector->ceilingheight != li->backsector->ceilingheight)
{
slope = FixedDiv(opentop - shootz, dist);
if (slope < topslope)
topslope = slope;
}
if (topslope <= bottomslope)
return false; // stop
return true; // shot continues
}
// shoot a thing
th = in->d.thing;
if (th == shootthing)
return true; // can't shoot self
if (!(th->flags & MF_SHOOTABLE))
return true; // corpse or something
// check angles to see if the thing can be aimed at
dist = FixedMul(attackrange, in->frac);
thingtopslope = FixedDiv(th->z + th->height - shootz, dist);
if (thingtopslope < bottomslope)
return true; // shot over the thing
thingbottomslope = FixedDiv(th->z - shootz, dist);
if (thingbottomslope > topslope)
return true; // shot under the thing
// this thing can be hit!
if (thingtopslope > topslope)
thingtopslope = topslope;
if (thingbottomslope < bottomslope)
thingbottomslope = bottomslope;
aimslope = (thingtopslope + thingbottomslope) / 2;
linetarget = th;
return false; // don't go any farther
}
//
// PTR_ShootTraverse
//
doom_boolean PTR_ShootTraverse(intercept_t* in)
{
fixed_t x;
fixed_t y;
fixed_t z;
fixed_t frac;
line_t* li;
mobj_t* th;
fixed_t slope;
fixed_t dist;
fixed_t thingtopslope;
fixed_t thingbottomslope;
if (in->isaline)
{
li = in->d.line;
if (li->special)
P_ShootSpecialLine(shootthing, li);
if (!(li->flags & ML_TWOSIDED))
goto hitline;
// crosses a two sided line
P_LineOpening(li);
dist = FixedMul(attackrange, in->frac);
if (li->frontsector->floorheight != li->backsector->floorheight)
{
slope = FixedDiv(openbottom - shootz, dist);
if (slope > aimslope)
goto hitline;
}
if (li->frontsector->ceilingheight != li->backsector->ceilingheight)
{
slope = FixedDiv(opentop - shootz, dist);
if (slope < aimslope)
goto hitline;
}
// shot continues
return true;
// hit line
hitline:
// position a bit closer
frac = in->frac - FixedDiv(4 * FRACUNIT, attackrange);
x = trace.x + FixedMul(trace.dx, frac);
y = trace.y + FixedMul(trace.dy, frac);
z = shootz + FixedMul(aimslope, FixedMul(frac, attackrange));
if (li->frontsector->ceilingpic == skyflatnum)
{
// don't shoot the sky!
if (z > li->frontsector->ceilingheight)
return false;
// it's a sky hack wall
if (li->backsector && li->backsector->ceilingpic == skyflatnum)
return false;
}
// Spawn bullet puffs.
P_SpawnPuff(x, y, z);
// don't go any farther
return false;
}
// shoot a thing
th = in->d.thing;
if (th == shootthing)
return true; // can't shoot self
if (!(th->flags & MF_SHOOTABLE))
return true; // corpse or something
// check angles to see if the thing can be aimed at
dist = FixedMul(attackrange, in->frac);
thingtopslope = FixedDiv(th->z + th->height - shootz, dist);
if (thingtopslope < aimslope)
return true; // shot over the thing
thingbottomslope = FixedDiv(th->z - shootz, dist);
if (thingbottomslope > aimslope)
return true; // shot under the thing
// hit thing
// position a bit closer
frac = in->frac - FixedDiv(10 * FRACUNIT, attackrange);
x = trace.x + FixedMul(trace.dx, frac);
y = trace.y + FixedMul(trace.dy, frac);
z = shootz + FixedMul(aimslope, FixedMul(frac, attackrange));
// Spawn bullet puffs or blod spots,
// depending on target type.
if (in->d.thing->flags & MF_NOBLOOD)
P_SpawnPuff(x, y, z);
else
P_SpawnBlood(x, y, z, la_damage);
if (la_damage)
P_DamageMobj(th, shootthing, shootthing, la_damage);
// don't go any farther
return false;
}
//
// P_AimLineAttack
//
fixed_t P_AimLineAttack(mobj_t* t1, angle_t angle, fixed_t distance)
{
fixed_t x2;
fixed_t y2;
angle >>= ANGLETOFINESHIFT;
shootthing = t1;
x2 = t1->x + (distance >> FRACBITS) * finecosine[angle];
y2 = t1->y + (distance >> FRACBITS) * finesine[angle];
shootz = t1->z + (t1->height >> 1) + 8 * FRACUNIT;
// can't shoot outside view angles
topslope = 100 * FRACUNIT / 160;
bottomslope = -100 * FRACUNIT / 160;
attackrange = distance;
linetarget = 0;
P_PathTraverse(t1->x, t1->y,
x2, y2,
PT_ADDLINES | PT_ADDTHINGS,
PTR_AimTraverse);
if (linetarget)
return aimslope;
return 0;
}
//
// P_LineAttack
// If damage == 0, it is just a test trace
// that will leave linetarget set.
//
void P_LineAttack(mobj_t* t1, angle_t angle, fixed_t distance, fixed_t slope, int damage)
{
fixed_t x2;
fixed_t y2;
angle >>= ANGLETOFINESHIFT;
shootthing = t1;
la_damage = damage;
x2 = t1->x + (distance >> FRACBITS) * finecosine[angle];
y2 = t1->y + (distance >> FRACBITS) * finesine[angle];
shootz = t1->z + (t1->height >> 1) + 8 * FRACUNIT;
attackrange = distance;
aimslope = slope;
P_PathTraverse(t1->x, t1->y,
x2, y2,
PT_ADDLINES | PT_ADDTHINGS,
PTR_ShootTraverse);
}
//
// USE LINES
//
doom_boolean PTR_UseTraverse(intercept_t* in)
{
int side;
if (!in->d.line->special)
{
P_LineOpening(in->d.line);
if (openrange <= 0)
{
S_StartSound(usething, sfx_noway);
// can't use through a wall
return false;
}
// not a special line, but keep checking
return true;
}
side = 0;
if (P_PointOnLineSide(usething->x, usething->y, in->d.line) == 1)
side = 1;
P_UseSpecialLine(usething, in->d.line, side);
// can't use for than one special line in a row
return false;
}
//
// P_UseLines
// Looks for special lines in front of the player to activate.
//
void P_UseLines(player_t* player)
{
int angle;
fixed_t x1;
fixed_t y1;
fixed_t x2;
fixed_t y2;
usething = player->mo;
angle = player->mo->angle >> ANGLETOFINESHIFT;
x1 = player->mo->x;
y1 = player->mo->y;
x2 = x1 + (USERANGE >> FRACBITS) * finecosine[angle];
y2 = y1 + (USERANGE >> FRACBITS) * finesine[angle];
P_PathTraverse(x1, y1, x2, y2, PT_ADDLINES, PTR_UseTraverse);
}
//
// RADIUS ATTACK
//
mobj_t* bombsource;
mobj_t* bombspot;
int bombdamage;
//
// PIT_RadiusAttack
// "bombsource" is the creature
// that caused the explosion at "bombspot".
//
doom_boolean PIT_RadiusAttack(mobj_t* thing)
{
fixed_t dx;
fixed_t dy;
fixed_t dist;
if (!(thing->flags & MF_SHOOTABLE))
return true;
// Boss spider and cyborg
// take no damage from concussion.
if (thing->type == MT_CYBORG
|| thing->type == MT_SPIDER)
return true;
dx = doom_abs(thing->x - bombspot->x);
dy = doom_abs(thing->y - bombspot->y);
dist = dx > dy ? dx : dy;
dist = (dist - thing->radius) >> FRACBITS;
if (dist < 0)
dist = 0;
if (dist >= bombdamage)
return true; // out of range
if (P_CheckSight(thing, bombspot))
{
// must be in direct path
P_DamageMobj(thing, bombspot, bombsource, bombdamage - dist);
}
return true;
}
//
// P_RadiusAttack
// Source is the creature that caused the explosion at spot.
//
void P_RadiusAttack(mobj_t* spot, mobj_t* source, int damage)
{
int x;
int y;
int xl;
int xh;
int yl;
int yh;
fixed_t dist;
dist = (damage + MAXRADIUS) << FRACBITS;
yh = (spot->y + dist - bmaporgy) >> MAPBLOCKSHIFT;
yl = (spot->y - dist - bmaporgy) >> MAPBLOCKSHIFT;
xh = (spot->x + dist - bmaporgx) >> MAPBLOCKSHIFT;
xl = (spot->x - dist - bmaporgx) >> MAPBLOCKSHIFT;
bombspot = spot;
bombsource = source;
bombdamage = damage;
for (y = yl; y <= yh; y++)
for (x = xl; x <= xh; x++)
P_BlockThingsIterator(x, y, PIT_RadiusAttack);
}
//
// 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.
//
//
// PIT_ChangeSector
//
doom_boolean PIT_ChangeSector(mobj_t* thing)
{
mobj_t* mo;
if (P_ThingHeightClip(thing))
{
// keep checking
return true;
}
// crunch bodies to giblets
if (thing->health <= 0)
{
P_SetMobjState(thing, S_GIBS);
thing->flags &= ~MF_SOLID;
thing->height = 0;
thing->radius = 0;
// keep checking
return true;
}
// crunch dropped items
if (thing->flags & MF_DROPPED)
{
P_RemoveMobj(thing);
// keep checking
return true;
}
if (!(thing->flags & MF_SHOOTABLE))
{
// assume it is bloody gibs or something
return true;
}
nofit = true;
if (crushchange && !(leveltime & 3))
{
P_DamageMobj(thing, 0, 0, 10);
// spray blood in a random direction
mo = P_SpawnMobj(thing->x,
thing->y,
thing->z + thing->height / 2, MT_BLOOD);
mo->momx = (P_Random() - P_Random()) << 12;
mo->momy = (P_Random() - P_Random()) << 12;
}
// keep checking (crush other things)
return true;
}
//
// P_ChangeSector
//
doom_boolean P_ChangeSector(sector_t* sector, doom_boolean crunch)
{
int x;
int y;
nofit = false;
crushchange = crunch;
// re-check heights for all things near the moving sector
for (x = sector->blockbox[BOXLEFT]; x <= sector->blockbox[BOXRIGHT]; x++)
for (y = sector->blockbox[BOXBOTTOM]; y <= sector->blockbox[BOXTOP]; y++)
P_BlockThingsIterator(x, y, PIT_ChangeSector);
return nofit;
}
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