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p_mobj.c
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p_mobj.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
* Copyright 2023, 2024 by
* Frenkel Smeijers
*
* 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:
* Moving object handling. Spawn functions.
*
*-----------------------------------------------------------------------------*/
#include <stdint.h>
#include "compiler.h"
#include "doomdef.h"
#include "d_player.h"
#include "m_random.h"
#include "r_main.h"
#include "p_maputl.h"
#include "p_map.h"
#include "p_tick.h"
#include "sounds.h"
#include "st_stuff.h"
#include "info.h"
#include "g_game.h"
#include "p_inter.h"
#include "i_system.h"
#include "globdata.h"
//
// P_SetMobjState
// Returns true if the mobj is still present.
//
boolean P_SetMobjState(mobj_t __far* mobj, statenum_t state)
{
const state_t* st;
do
{
if (state == S_NULL)
{
mobj->state = (state_t *) S_NULL;
P_RemoveMobj (mobj);
return false;
}
st = &states[state];
mobj->state = st;
mobj->tics = st->tics;
mobj->sprite = st->sprite;
mobj->frame = st->frame;
// Modified handling.
// Call action functions when the state is set
if(st->action)
{
st->action(mobj);
}
state = st->nextstate;
} while (!mobj->tics);
return true;
}
//
// P_ExplodeMissile
//
static void P_ExplodeMissile(mobj_t __far* mo)
{
mo->momx = mo->momy = mo->momz = 0;
P_SetMobjState (mo, mobjinfo[mo->type].deathstate);
mo->tics -= P_Random()&3;
if (mo->tics < 1)
mo->tics = 1;
mo->flags &= ~MF_MISSILE;
}
//
// SLIDE MOVE
// Allows the player to slide along any angled walls.
//
static fixed_t bestslidefrac;
static const line_t __far* bestslideline;
static mobj_t __far* slidemo;
static fixed_t tmxmove;
static fixed_t tmymove;
//
// P_HitSlideLine
// Adjusts the xmove / ymove
// so that the next move will slide along the wall.
// If the floor is icy, then you can bounce off a wall. // phares
//
static void P_HitSlideLine(const line_t __far* ld)
{
int16_t side;
angle_t lineangle;
angle_t moveangle;
angle_t deltaangle;
fixed_t movelen;
fixed_t newlen;
// |
// Under icy conditions, if the angle of approach to the wall // V
// is more than 45 degrees, then you'll bounce and lose half
// your momentum. If less than 45 degrees, you'll slide along
// the wall. 45 is arbitrary and is believable.
// Check for the special cases of horz or vert walls.
/* killough 10/98: only bounce if hit hard (prevents wobbling)
* cph - DEMOSYNC - should only affect players in Boom demos? */
if (ld->dy == 0)
{
tmymove = 0; // no more movement in the Y direction
return;
}
if (ld->dx == 0)
{ // phares
tmxmove = 0; // no more movement in the X direction
return;
}
// The wall is angled. Bounce if the angle of approach is // phares
// less than 45 degrees. // phares
side = P_PointOnLineSide (slidemo->x, slidemo->y, ld);
lineangle = R_PointToAngle2 (0,0, (fixed_t)ld->dx<<FRACBITS, (fixed_t)ld->dy<<FRACBITS);
if (side == 1)
lineangle += ANG180;
moveangle = R_PointToAngle2 (0,0, tmxmove, tmymove);
// killough 3/2/98:
// The moveangle+=10 breaks v1.9 demo compatibility in
// some demos, so it needs demo_compatibility switch.
moveangle += 10; // prevents sudden path reversal due to // phares
// rounding error // |
deltaangle = moveangle-lineangle; // V
movelen = P_AproxDistance (tmxmove, tmymove);
// |
// phares
if (deltaangle > ANG180)
deltaangle += ANG180;
// I_Error ("SlideLine: ang>ANG180");
lineangle >>= ANGLETOFINESHIFT;
deltaangle >>= ANGLETOFINESHIFT;
newlen = FixedMulAngle(movelen, finecosine(deltaangle));
tmxmove = FixedMulAngle(newlen, finecosine(lineangle));
tmymove = FixedMulAngle(newlen, finesine( lineangle));
// phares
}
//
// PTR_SlideTraverse
//
static boolean PTR_SlideTraverse (intercept_t* in)
{
const line_t __far* li;
if (!in->isaline)
I_Error ("PTR_SlideTraverse: not a line?");
li = in->d.line;
if ( ! (li->flags & ML_TWOSIDED) )
{
if (P_PointOnLineSide (slidemo->x, slidemo->y, li))
return true; // don't hit the back side
goto isblocking;
}
// set openrange, opentop, openbottom.
// These define a 'window' from one sector to another across a line
P_LineOpening (li);
if (_g_openrange < slidemo->height)
goto isblocking; // doesn't fit
if (_g_opentop - slidemo->z < slidemo->height)
goto isblocking; // mobj is too high
if (_g_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)
{
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.
//
// killough 11/98: reformatted
static void P_SlideMove(mobj_t __far* mo)
{
int8_t hitcount = 3;
slidemo = mo; // the object that's sliding
do
{
fixed_t leadx, leady, trailx, traily;
if (!--hitcount)
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 must have hit the middle, so stairstep
stairstep:
/* phares 5/4/98: kill momentum if you can't move at all
* This eliminates player bobbing if pressed against a wall
* while on ice.
*
* killough 10/98: keep buggy code around for old Boom demos
*
* cph 2000/09//23: buggy code was only in Boom v2.01
*/
if (!P_TryMove(mo, mo->x, mo->y + mo->momy))
P_TryMove(mo, mo->x + mo->momx, mo->y);
break;
}
// fudge a bit to make sure it doesn't hit
if ((bestslidefrac -= 0x800) > 0)
{
fixed_t newx = FixedMul(mo->momx, bestslidefrac);
fixed_t 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)
break;
tmxmove = FixedMul(mo->momx, bestslidefrac);
tmymove = FixedMul(mo->momy, bestslidefrac);
P_HitSlideLine(bestslideline); // clip the moves
mo->momx = tmxmove;
mo->momy = tmymove;
/* killough 10/98: affect the bobbing the same way (but not voodoo dolls)
* cph - DEMOSYNC? */
if (P_MobjIsPlayer(mo) && P_MobjIsPlayer(mo)->mo == mo)
{
if (D_abs(P_MobjIsPlayer(mo)->momx) > D_abs(tmxmove))
P_MobjIsPlayer(mo)->momx = tmxmove;
if (D_abs(P_MobjIsPlayer(mo)->momy) > D_abs(tmymove))
P_MobjIsPlayer(mo)->momy = tmymove;
}
}
while (!P_TryMove(mo, mo->x+tmxmove, mo->y+tmymove));
}
static fixed_t FixedMul32OrigFriction(fixed_t a)
{
uint16_t alw = a;
int16_t ahw = a >> FRACBITS;
uint32_t ll = (uint32_t) alw * ORIG_FRICTION;
int32_t hl = ( int32_t) ahw * ORIG_FRICTION;
return (ll >> FRACBITS) + hl;
}
//
// P_XYMovement
//
// Attempts to move something if it has momentum.
//
#define MAXMOVE (30*FRACUNIT)
#define STOPSPEED (FRACUNIT/16)
static void P_XYMovement(mobj_t __far* mo)
{
player_t *player;
fixed_t xmove, ymove;
if (!(mo->momx | mo->momy)) // Any momentum?
return;
player = P_MobjIsPlayer(mo);
if (mo->momx > MAXMOVE)
mo->momx = MAXMOVE;
else if (mo->momx < -MAXMOVE)
mo->momx = -MAXMOVE;
if (mo->momy > MAXMOVE)
mo->momy = MAXMOVE;
else if (mo->momy < -MAXMOVE)
mo->momy = -MAXMOVE;
xmove = mo->momx;
ymove = mo->momy;
do
{
fixed_t ptryx, ptryy;
// killough 8/9/98: fix bug in original Doom source:
// Large negative displacements were never considered.
// This explains the tendency for Mancubus fireballs
// to pass through walls.
// CPhipps - compatibility optioned
if (xmove > MAXMOVE/2 || ymove > MAXMOVE/2 || ((xmove < -MAXMOVE/2 || ymove < -MAXMOVE/2)))
{
ptryx = mo->x + xmove/2;
ptryy = mo->y + ymove/2;
xmove >>= 1;
ymove >>= 1;
}
else
{
ptryx = mo->x + xmove;
ptryy = mo->y + ymove;
xmove = ymove = 0;
}
if (!P_TryMove (mo, ptryx, ptryy))
{
// blocked move
if (player) // try to slide along it
P_SlideMove (mo);
else
{
if (mo->flags & MF_MISSILE)
{
// explode a missile
if (_g_ceilingline)
{
const sector_t __far* ceilingBackSector = LN_BACKSECTOR(_g_ceilingline);
if(ceilingBackSector && ceilingBackSector->ceilingpic == skyflatnum)
{
if (mo->z > ceilingBackSector->ceilingheight)
{
// Hack to prevent missiles exploding
// against the sky.
// Does not handle sky floors.
P_RemoveMobj (mo);
return;
}
}
}
P_ExplodeMissile (mo);
}
else // whatever else it is, it is now standing still in (x,y)
{
mo->momx = mo->momy = 0;
}
}
}
} while (xmove || ymove);
// slow down
/* no friction for missiles or skulls ever, no friction when airborne */
if (mo->flags & MF_MISSILE || mo->z > mo->floorz)
return;
/* killough 8/11/98: add bouncers
* killough 9/15/98: add objects falling off ledges
* killough 11/98: only include bouncers hanging off ledges
*/
if ((mo->flags & MF_CORPSE) &&
(mo->momx > FRACUNIT/4 || mo->momx < -FRACUNIT/4 ||
mo->momy > FRACUNIT/4 || mo->momy < -FRACUNIT/4) &&
mo->floorz != mo->subsector->sector->floorheight)
return; // do not stop sliding if halfway off a step with some momentum
// killough 11/98:
// Stop voodoo dolls that have come to rest, despite any
// moving corresponding player, except in old demos:
if (mo->momx > -STOPSPEED && mo->momx < STOPSPEED &&
mo->momy > -STOPSPEED && mo->momy < STOPSPEED &&
(!player || !(player->cmd.forwardmove | player->cmd.sidemove) ||
(player->mo != mo)))
{
// if in a walking frame, stop moving
// killough 10/98:
// Don't affect main player when voodoo dolls stop, except in old demos:
if (player && (uint16_t)(player->mo->state - states - S_PLAY_RUN1) < 4
&& (player->mo == mo))
P_SetMobjState(player->mo, S_PLAY);
mo->momx = mo->momy = 0;
/* killough 10/98: kill any bobbing momentum too (except in voodoo dolls)
* cph - DEMOSYNC - needs compatibility check?
*/
if (player && player->mo == mo)
player->momx = player->momy = 0;
}
else
{
/* phares 3/17/98
*
* Friction will have been adjusted by friction thinkers for
* icy or muddy floors. Otherwise it was never touched and
* remained set at ORIG_FRICTION
*
* killough 8/28/98: removed inefficient thinker algorithm,
* instead using touching_sectorlist in P_GetFriction() to
* determine friction (and thus only when it is needed).
*
* killough 10/98: changed to work with new bobbing method.
* Reducing player momentum is no longer needed to reduce
* bobbing, so ice works much better now.
*
* cph - DEMOSYNC - need old code for Boom demos?
*/
mo->momx = FixedMul32OrigFriction(mo->momx);
mo->momy = FixedMul32OrigFriction(mo->momy);
/* killough 10/98: Always decrease player bobbing by ORIG_FRICTION.
* This prevents problems with bobbing on ice, where it was not being
* reduced fast enough, leading to all sorts of kludges being developed.
*/
if (player && player->mo == mo) /* Not voodoo dolls */
{
player->momx = FixedMul32OrigFriction(player->momx);
player->momy = FixedMul32OrigFriction(player->momy);
}
}
}
//
// P_ZMovement
//
// Attempt vertical movement.
#define GRAVITY FRACUNIT
static void P_ZMovement(mobj_t __far* mo)
{
// check for smooth step up
if (P_MobjIsPlayer(mo) &&
P_MobjIsPlayer(mo)->mo == mo && // killough 5/12/98: exclude voodoo dolls
mo->z < mo->floorz)
{
P_MobjIsPlayer(mo)->viewheight -= mo->floorz-mo->z;
P_MobjIsPlayer(mo)->deltaviewheight = (VIEWHEIGHT - P_MobjIsPlayer(mo)->viewheight)>>3;
}
// adjust altitude
mo->z += mo->momz;
// clip movement
if (mo->z <= mo->floorz)
{
// hit the floor
if (mo->momz < 0)
{
if (P_MobjIsPlayer(mo) && /* killough 5/12/98: exclude voodoo dolls */
P_MobjIsPlayer(mo)->mo == mo && mo->momz < -GRAVITY*8)
{
// Squat down.
// Decrease viewheight for a moment
// after hitting the ground (hard),
// and utter appropriate sound.
P_MobjIsPlayer(mo)->deltaviewheight = mo->momz>>3;
}
mo->momz = 0;
}
mo->z = mo->floorz;
if (mo->flags & MF_MISSILE)
{
P_ExplodeMissile (mo);
return;
}
}
else // still above the floor // phares
if (!(mo->flags & MF_NOGRAVITY))
{
if (!mo->momz)
mo->momz = -GRAVITY;
mo->momz -= GRAVITY;
}
if (mo->z + mo->height > mo->ceilingz)
{
// hit the ceiling
if (mo->momz > 0)
mo->momz = 0;
mo->z = mo->ceilingz - mo->height;
if (mo->flags & MF_MISSILE)
{
P_ExplodeMissile (mo);
return;
}
}
}
static void P_MobjThinker (mobj_t __far* mobj)
{
// momentum movement
if (mobj->momx | mobj->momy)
{
P_XYMovement(mobj);
}
if (mobj->z != mobj->floorz || mobj->momz)
{
P_ZMovement(mobj);
}
// cycle through states,
// calling action functions at transitions
if (mobj->tics != -1)
{
mobj->tics--;
// you can cycle through multiple states in a tic
if (!mobj->tics)
if (!P_SetMobjState (mobj, mobj->state->nextstate) )
return; // freed itself
}
}
//Thinker function for stuff that doesn't need to do anything
//interesting.
//Just cycles through the states. Allows sprite animation to work.
static void P_MobjBrainlessThinker(mobj_t __far* mobj)
{
// cycle through states,
// calling action functions at transitions
if (mobj->tics != -1)
{
mobj->tics--;
// you can cycle through multiple states in a tic
if (!mobj->tics)
P_SetMobjState (mobj, mobj->state->nextstate);
}
}
static think_t P_ThinkerFunctionForType(mobjtype_t type, mobj_t __far* mobj)
{
//Full thinking ability.
if(type < MT_MISC0)
return P_MobjThinker;
//Just state cycles.
if(mobj->tics != -1)
return P_MobjBrainlessThinker;
//No thinking at all.
return NULL;
}
//
// P_SpawnMobj
//
static mobj_t __far* P_NewMobj()
{
mobj_t __far* mobj = NULL;
for(int16_t i = _g_thingPoolSize-1; i >= 0; i--)
{
if(_g_thingPool[i].type == MT_NOTHING)
{
mobj = &_g_thingPool[i];
_fmemset (mobj, 0, sizeof (*mobj));
mobj->pooled = true;
return mobj;
}
}
if(mobj == NULL)
{
mobj = Z_MallocLevel(sizeof(*mobj), NULL);
_fmemset (mobj, 0, sizeof (*mobj));
}
return mobj;
}
mobj_t __far* P_SpawnMobj(fixed_t x,fixed_t y,fixed_t z,mobjtype_t type)
{
const state_t* st;
const mobjinfo_t* info;
mobj_t __far* mobj = P_NewMobj();
info = &mobjinfo[type];
mobj->type = type;
mobj->x = x;
mobj->y = y;
mobj->radius = info->radius;
mobj->height = info->height; // phares
mobj->flags |= info->flags;
if (type == MT_PLAYER) // Except in old demos, players
mobj->flags |= MF_FRIEND; // are always friends.
mobj->health = info->spawnhealth;
mobj->reactiontime = info->reactiontime;
P_Random(); // only to call random for compatibiltiy
// do not set the state with P_SetMobjState,
// because action routines can not be called yet
st = &states[info->spawnstate];
mobj->state = st;
mobj->tics = st->tics;
mobj->sprite = st->sprite;
mobj->frame = st->frame;
mobj->touching_sectorlist = NULL; // NULL head of sector list // phares 3/13/98
// set subsector and/or block links
P_SetThingPosition (mobj);
mobj->dropoffz = /* killough 11/98: for tracking dropoffs */
mobj->floorz = mobj->subsector->sector->floorheight;
mobj->ceilingz = mobj->subsector->sector->ceilingheight;
mobj->z = z == ONFLOORZ ? mobj->floorz : z == ONCEILINGZ ?
mobj->ceilingz - mobj->height : z;
mobj->thinker.function = P_ThinkerFunctionForType(type, mobj);
mobj->target = mobj->tracer = mobj->lastenemy = NULL;
P_AddThinker (&mobj->thinker);
return mobj;
}
//
// P_RemoveMobj
//
void P_RemoveMobj(mobj_t __far* mobj)
{
P_UnsetThingPosition (mobj);
// Delete all nodes on the current sector_list phares 3/16/98
P_DelSeclist();
// killough 11/98:
//
// Remove any references to other mobjs.
//
// Older demos might depend on the fields being left alone, however,
// if multiple thinkers reference each other indirectly before the
// end of the current tic.
// CPhipps - only leave dead references in old demos; I hope lxdoom_1 level
// demos are rare and don't rely on this. I hope.
if (!_g_demoplayback)
{
mobj->target = NULL;
mobj->tracer = NULL;
mobj->lastenemy = NULL;
}
// free block
P_RemoveThing (mobj);
}
/*
* P_FindDoomedNum
*
* Finds a mobj type with a matching doomednum
*
*/
static PUREFUNC int16_t P_FindDoomedNum(int16_t type)
{
// find which type to spawn
for (int16_t i = 0; i < NUMMOBJTYPES; i++)
{
if (type == mobjinfo[i].doomednum)
return i;
}
I_Error("P_FindDoomedNum: unknown thing %i", type);
}
//
// P_SpawnPlayer
// Called when a player is spawned on the level.
// Most of the player structure stays unchanged
// between levels.
//
static void P_SpawnPlayer(int16_t playerx, int16_t playery, int8_t playerangle)
{
player_t* p;
mobj_t __far* mobj;
// not playing?
if (!_g_playeringame)
return;
p = &_g_player;
if (p->playerstate == PST_REBORN)
G_PlayerReborn ();
fixed_t x = ((int32_t)playerx) << FRACBITS;
fixed_t y = ((int32_t)playery) << FRACBITS;
fixed_t z = ONFLOORZ;
mobj = P_SpawnMobj (x,y,z, MT_PLAYER);
// set color translations for player sprites
mobj->angle = ANG45 * playerangle;
mobj->health = p->health;
p->mo = mobj;
p->playerstate = PST_LIVE;
p->refire = 0;
p->message = NULL;
p->damagecount = 0;
p->bonuscount = 0;
p->extralight = 0;
p->fixedcolormap = 0;
p->viewheight = VIEWHEIGHT;
p->momx = p->momy = 0; // killough 10/98: initialize bobbing to 0.
// setup gun psprite
P_SetupPsprites (p);
ST_Start(); // wake up the status bar
}
//
// P_SpawnMapThing
// The fields of the mapthing should
// already be in host byte order.
//
// These are Thing flags
// Skill flags.
#define MTF_EASY 1
#define MTF_NORMAL 2
#define MTF_HARD 4
// Deaf monsters/do not react to sound.
#define MTF_AMBUSH 8
void P_SpawnMapThing(const mapthing_t __far* mthing)
{
int16_t i;
mobj_t __far* mobj;
fixed_t x;
fixed_t y;
// check for players specially
//Only care about start spot for player 1.
if (mthing->type == 1)
{
P_SpawnPlayer(mthing->x, mthing->y, mthing->angle);
return;
}
// check for apropriate skill level
if (_g_gameskill == sk_baby || _g_gameskill == sk_easy ?
!(mthing->options & MTF_EASY) :
_g_gameskill == sk_hard ?
!(mthing->options & MTF_HARD) : !(mthing->options & MTF_NORMAL))
return;
// find which type to spawn
i = P_FindDoomedNum(mthing->type);
x = ((int32_t)mthing->x) << FRACBITS;
y = ((int32_t)mthing->y) << FRACBITS;
mobj = P_SpawnMobj(x, y, ONFLOORZ, i);
if (mobj->tics > 0)
mobj->tics = 1 + (P_Random () % mobj->tics);
mobj->angle = ANG45 * mthing->angle;
if (mthing->options & MTF_AMBUSH)
mobj->flags |= MF_AMBUSH;
}
//
// GAME SPAWN FUNCTIONS
//
//
// P_SpawnPuff
//
void P_SpawnPuff(fixed_t x,fixed_t y,fixed_t z)
{
mobj_t __far* th;
// killough 5/5/98: remove dependence on order of evaluation:
int32_t t = P_Random();
z += (t - P_Random())<<10;
th = P_SpawnMobj (x,y,z, MT_PUFF);
th->momz = FRACUNIT;
th->tics -= P_Random()&3;
if (th->tics < 1)
th->tics = 1;
// don't make punches spark on the wall
if (P_IsAttackRangeMeleeRange())
P_SetMobjState (th, S_PUFF3);
}
//
// P_SpawnBlood
//
void P_SpawnBlood(fixed_t x,fixed_t y,fixed_t z,int16_t damage)
{
mobj_t __far* th;
// killough 5/5/98: remove dependence on order of evaluation:
fixed_t t = P_Random();
z += (t - P_Random())<<10;
th = P_SpawnMobj(x,y,z, MT_BLOOD);
th->momz = FRACUNIT*2;
th->tics -= P_Random()&3;
if (th->tics < 1)
th->tics = 1;
if (9 <= damage && damage <= 12)
P_SetMobjState (th,S_BLOOD2);
else if (damage < 9)
P_SetMobjState (th,S_BLOOD3);
}
//
// P_CheckMissileSpawn
// Moves the missile forward a bit
// and possibly explodes it right there.
//
static void P_CheckMissileSpawn(mobj_t __far* th)
{
th->tics -= P_Random()&3;
if (th->tics < 1)
th->tics = 1;
// move a little forward so an angle can
// be computed if it immediately explodes