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P_ENEMY.C
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// P_enemy.c
#include <stdlib.h>
#include "DoomDef.h"
#include "P_local.h"
#include "soundst.h"
// Macros
#define MAX_BOSS_SPOTS 8
// Types
typedef struct
{
fixed_t x;
fixed_t y;
angle_t angle;
} BossSpot_t;
// Private Data
static int BossSpotCount;
static BossSpot_t BossSpots[MAX_BOSS_SPOTS];
//----------------------------------------------------------------------------
//
// PROC P_InitMonsters
//
// Called at level load.
//
//----------------------------------------------------------------------------
void P_InitMonsters(void)
{
BossSpotCount = 0;
}
//----------------------------------------------------------------------------
//
// PROC P_AddBossSpot
//
//----------------------------------------------------------------------------
void P_AddBossSpot(fixed_t x, fixed_t y, angle_t angle)
{
if(BossSpotCount == MAX_BOSS_SPOTS)
{
I_Error("Too many boss spots.");
}
BossSpots[BossSpotCount].x = x;
BossSpots[BossSpotCount].y = y;
BossSpots[BossSpotCount].angle = angle;
BossSpotCount++;
}
//----------------------------------------------------------------------------
//
// PROC P_RecursiveSound
//
//----------------------------------------------------------------------------
mobj_t *soundtarget;
void P_RecursiveSound(sector_t *sec, int soundblocks)
{
int i;
line_t *check;
sector_t *other;
// Wake up all monsters in this sector
if(sec->validcount == validcount && sec->soundtraversed <= soundblocks+1)
{ // Already flooded
return;
}
sec->validcount = validcount;
sec->soundtraversed = soundblocks+1;
sec->soundtarget = soundtarget;
for(i = 0; i < sec->linecount; i++)
{
check = sec->lines[i];
if(!(check->flags&ML_TWOSIDED))
{
continue;
}
P_LineOpening(check);
if(openrange <= 0)
{ // Closed door
continue;
}
if(sides[check->sidenum[0]].sector == sec)
{
other = sides[check->sidenum[1]].sector;
}
else
{
other = sides[check->sidenum[0]].sector;
}
if(check->flags&ML_SOUNDBLOCK)
{
if(!soundblocks)
{
P_RecursiveSound(other, 1);
}
}
else
{
P_RecursiveSound(other, soundblocks);
}
}
}
//----------------------------------------------------------------------------
//
// PROC P_NoiseAlert
//
// If a monster yells at a player, it will alert other monsters to the
// player.
//
//----------------------------------------------------------------------------
void P_NoiseAlert(mobj_t *target, mobj_t *emmiter)
{
soundtarget = target;
validcount++;
P_RecursiveSound(emmiter->subsector->sector, 0);
}
//----------------------------------------------------------------------------
//
// FUNC P_CheckMeleeRange
//
//----------------------------------------------------------------------------
boolean P_CheckMeleeRange(mobj_t *actor)
{
mobj_t *mo;
fixed_t dist;
if(!actor->target)
{
return(false);
}
mo = actor->target;
dist = P_AproxDistance(mo->x-actor->x, mo->y-actor->y);
if(dist >= MELEERANGE)
{
return(false);
}
if(!P_CheckSight(actor, mo))
{
return(false);
}
if(mo->z > actor->z+actor->height)
{ // Target is higher than the attacker
return(false);
}
else if(actor->z > mo->z+mo->height)
{ // Attacker is higher
return(false);
}
return(true);
}
//----------------------------------------------------------------------------
//
// FUNC P_CheckMissileRange
//
//----------------------------------------------------------------------------
boolean P_CheckMissileRange(mobj_t *actor)
{
fixed_t dist;
if(!P_CheckSight(actor, actor->target))
{
return(false);
}
if(actor->flags&MF_JUSTHIT)
{ // The target just hit the enemy, so fight back!
actor->flags &= ~MF_JUSTHIT;
return(true);
}
if(actor->reactiontime)
{ // Don't attack yet
return(false);
}
dist = (P_AproxDistance(actor->x-actor->target->x,
actor->y-actor->target->y)>>FRACBITS)-64;
if(!actor->info->meleestate)
{ // No melee attack, so fire more frequently
dist -= 128;
}
if(actor->type == MT_IMP)
{ // Imp's fly attack from far away
dist >>= 1;
}
if(dist > 200)
{
dist = 200;
}
if(P_Random() < dist)
{
return(false);
}
return(true);
}
/*
================
=
= P_Move
=
= Move in the current direction
= returns false if the move is blocked
================
*/
fixed_t xspeed[8] = {FRACUNIT,47000,0,-47000,-FRACUNIT,-47000,0,47000};
fixed_t yspeed[8] = {0,47000,FRACUNIT,47000,0,-47000,-FRACUNIT,-47000};
#define MAXSPECIALCROSS 8
extern line_t *spechit[MAXSPECIALCROSS];
extern int numspechit;
boolean P_Move(mobj_t *actor)
{
fixed_t tryx, tryy;
line_t *ld;
boolean good;
if(actor->movedir == DI_NODIR)
{
return(false);
}
tryx = actor->x+actor->info->speed*xspeed[actor->movedir];
tryy = actor->y+actor->info->speed*yspeed[actor->movedir];
if(!P_TryMove(actor, tryx, tryy))
{ // open any specials
if(actor->flags&MF_FLOAT && floatok)
{ // must adjust height
if(actor->z < tmfloorz)
{
actor->z += FLOATSPEED;
}
else
{
actor->z -= FLOATSPEED;
}
actor->flags |= MF_INFLOAT;
return(true);
}
if(!numspechit)
{
return false;
}
actor->movedir = DI_NODIR;
good = false;
while(numspechit--)
{
ld = spechit[numspechit];
// if the special isn't a door that can be opened, return false
if(P_UseSpecialLine(actor, ld))
{
good = true;
}
}
return(good);
}
else
{
actor->flags &= ~MF_INFLOAT;
}
if(!(actor->flags&MF_FLOAT))
{
if(actor->z > actor->floorz)
{
P_HitFloor(actor);
}
actor->z = actor->floorz;
}
return(true);
}
//----------------------------------------------------------------------------
//
// FUNC P_TryWalk
//
// Attempts to move actor in its current (ob->moveangle) direction.
// If blocked by either a wall or an actor returns FALSE.
// If move is either clear of block only by a door, returns TRUE and sets.
// If a door is in the way, an OpenDoor call is made to start it opening.
//
//----------------------------------------------------------------------------
boolean P_TryWalk(mobj_t *actor)
{
if(!P_Move(actor))
{
return(false);
}
actor->movecount = P_Random()&15;
return(true);
}
/*
================
=
= P_NewChaseDir
=
================
*/
dirtype_t opposite[] =
{DI_WEST, DI_SOUTHWEST, DI_SOUTH, DI_SOUTHEAST, DI_EAST, DI_NORTHEAST,
DI_NORTH, DI_NORTHWEST, DI_NODIR};
dirtype_t diags[] = {DI_NORTHWEST,DI_NORTHEAST,DI_SOUTHWEST,DI_SOUTHEAST};
void P_NewChaseDir (mobj_t *actor)
{
fixed_t deltax,deltay;
dirtype_t d[3];
dirtype_t tdir, olddir, turnaround;
if (!actor->target)
I_Error ("P_NewChaseDir: called with no target");
olddir = actor->movedir;
turnaround=opposite[olddir];
deltax = actor->target->x - actor->x;
deltay = actor->target->y - actor->y;
if (deltax>10*FRACUNIT)
d[1]= DI_EAST;
else if (deltax<-10*FRACUNIT)
d[1]= DI_WEST;
else
d[1]=DI_NODIR;
if (deltay<-10*FRACUNIT)
d[2]= DI_SOUTH;
else if (deltay>10*FRACUNIT)
d[2]= DI_NORTH;
else
d[2]=DI_NODIR;
// try direct route
if (d[1] != DI_NODIR && d[2] != DI_NODIR)
{
actor->movedir = diags[((deltay<0)<<1)+(deltax>0)];
if (actor->movedir != turnaround && P_TryWalk(actor))
return;
}
// try other directions
if (P_Random() > 200 || abs(deltay)>abs(deltax))
{
tdir=d[1];
d[1]=d[2];
d[2]=tdir;
}
if (d[1]==turnaround)
d[1]=DI_NODIR;
if (d[2]==turnaround)
d[2]=DI_NODIR;
if (d[1]!=DI_NODIR)
{
actor->movedir = d[1];
if (P_TryWalk(actor))
return; /*either moved forward or attacked*/
}
if (d[2]!=DI_NODIR)
{
actor->movedir =d[2];
if (P_TryWalk(actor))
return;
}
/* there is no direct path to the player, so pick another direction */
if (olddir!=DI_NODIR)
{
actor->movedir =olddir;
if (P_TryWalk(actor))
return;
}
if (P_Random()&1) /*randomly determine direction of search*/
{
for (tdir=DI_EAST ; tdir<=DI_SOUTHEAST ; tdir++)
{
if (tdir!=turnaround)
{
actor->movedir =tdir;
if ( P_TryWalk(actor) )
return;
}
}
}
else
{
for (tdir=DI_SOUTHEAST ; tdir >= DI_EAST;tdir--)
{
if (tdir!=turnaround)
{
actor->movedir =tdir;
if ( P_TryWalk(actor) )
return;
}
}
}
if (turnaround != DI_NODIR)
{
actor->movedir =turnaround;
if ( P_TryWalk(actor) )
return;
}
actor->movedir = DI_NODIR; // can't move
}
//---------------------------------------------------------------------------
//
// FUNC P_LookForMonsters
//
//---------------------------------------------------------------------------
#define MONS_LOOK_RANGE (20*64*FRACUNIT)
#define MONS_LOOK_LIMIT 64
boolean P_LookForMonsters(mobj_t *actor)
{
int count;
mobj_t *mo;
thinker_t *think;
if(!P_CheckSight(players[0].mo, actor))
{ // Player can't see monster
return(false);
}
count = 0;
for(think = thinkercap.next; think != &thinkercap; think = think->next)
{
if(think->function != P_MobjThinker)
{ // Not a mobj thinker
continue;
}
mo = (mobj_t *)think;
if(!(mo->flags&MF_COUNTKILL) || (mo == actor) || (mo->health <= 0))
{ // Not a valid monster
continue;
}
if(P_AproxDistance(actor->x-mo->x, actor->y-mo->y)
> MONS_LOOK_RANGE)
{ // Out of range
continue;
}
if(P_Random() < 16)
{ // Skip
continue;
}
if(count++ > MONS_LOOK_LIMIT)
{ // Stop searching
return(false);
}
if(!P_CheckSight(actor, mo))
{ // Out of sight
continue;
}
// Found a target monster
actor->target = mo;
return(true);
}
return(false);
}
/*
================
=
= P_LookForPlayers
=
= If allaround is false, only look 180 degrees in front
= returns true if a player is targeted
================
*/
boolean P_LookForPlayers(mobj_t *actor, boolean allaround)
{
int c;
int stop;
player_t *player;
sector_t *sector;
angle_t an;
fixed_t dist;
if(!netgame && players[0].health <= 0)
{ // Single player game and player is dead, look for monsters
return(P_LookForMonsters(actor));
}
sector = actor->subsector->sector;
c = 0;
stop = (actor->lastlook-1)&3;
for( ; ; actor->lastlook = (actor->lastlook+1)&3 )
{
if (!playeringame[actor->lastlook])
continue;
if (c++ == 2 || actor->lastlook == stop)
return false; // done looking
player = &players[actor->lastlook];
if (player->health <= 0)
continue; // dead
if (!P_CheckSight (actor, player->mo))
continue; // out of sight
if (!allaround)
{
an = R_PointToAngle2 (actor->x, actor->y,
player->mo->x, player->mo->y) - actor->angle;
if (an > ANG90 && an < ANG270)
{
dist = P_AproxDistance (player->mo->x - actor->x,
player->mo->y - actor->y);
// if real close, react anyway
if (dist > MELEERANGE)
continue; // behind back
}
}
if(player->mo->flags&MF_SHADOW)
{ // Player is invisible
if((P_AproxDistance(player->mo->x-actor->x,
player->mo->y-actor->y) > 2*MELEERANGE)
&& P_AproxDistance(player->mo->momx, player->mo->momy)
< 5*FRACUNIT)
{ // Player is sneaking - can't detect
return(false);
}
if(P_Random() < 225)
{ // Player isn't sneaking, but still didn't detect
return(false);
}
}
actor->target = player->mo;
return(true);
}
return(false);
}
/*
===============================================================================
ACTION ROUTINES
===============================================================================
*/
/*
==============
=
= A_Look
=
= Stay in state until a player is sighted
=
==============
*/
void A_Look (mobj_t *actor)
{
mobj_t *targ;
actor->threshold = 0; // any shot will wake up
targ = actor->subsector->sector->soundtarget;
if (targ && (targ->flags & MF_SHOOTABLE) )
{
actor->target = targ;
if ( actor->flags & MF_AMBUSH )
{
if (P_CheckSight (actor, actor->target))
goto seeyou;
}
else
goto seeyou;
}
if (!P_LookForPlayers (actor, false) )
return;
// go into chase state
seeyou:
if (actor->info->seesound)
{
int sound;
/*
switch (actor->info->seesound)
{
case sfx_posit1:
case sfx_posit2:
case sfx_posit3:
sound = sfx_posit1+P_Random()%3;
break;
case sfx_bgsit1:
case sfx_bgsit2:
sound = sfx_bgsit1+P_Random()%2;
break;
default:
sound = actor->info->seesound;
break;
}
*/
sound = actor->info->seesound;
if(actor->flags2&MF2_BOSS)
{ // Full volume
S_StartSound(NULL, sound);
}
else
{
S_StartSound(actor, sound);
}
}
P_SetMobjState(actor, actor->info->seestate);
}
/*
==============
=
= A_Chase
=
= Actor has a melee attack, so it tries to close as fast as possible
=
==============
*/
void A_Chase(mobj_t *actor)
{
int delta;
if(actor->reactiontime)
{
actor->reactiontime--;
}
// Modify target threshold
if(actor->threshold)
{
actor->threshold--;
}
if(gameskill == sk_nightmare)
{ // Monsters move faster in nightmare mode
actor->tics -= actor->tics/2;
if(actor->tics < 3)
{
actor->tics = 3;
}
}
//
// turn towards movement direction if not there yet
//
if(actor->movedir < 8)
{
actor->angle &= (7<<29);
delta = actor->angle-(actor->movedir << 29);
if(delta > 0)
{
actor->angle -= ANG90/2;
}
else if(delta < 0)
{
actor->angle += ANG90/2;
}
}
if(!actor->target || !(actor->target->flags&MF_SHOOTABLE))
{ // look for a new target
if(P_LookForPlayers(actor, true))
{ // got a new target
return;
}
P_SetMobjState(actor, actor->info->spawnstate);
return;
}
//
// don't attack twice in a row
//
if(actor->flags & MF_JUSTATTACKED)
{
actor->flags &= ~MF_JUSTATTACKED;
if (gameskill != sk_nightmare)
P_NewChaseDir (actor);
return;
}
//
// check for melee attack
//
if (actor->info->meleestate && P_CheckMeleeRange (actor))
{
if (actor->info->attacksound)
S_StartSound (actor, actor->info->attacksound);
P_SetMobjState (actor, actor->info->meleestate);
return;
}
//
// check for missile attack
//
if (actor->info->missilestate)
{
if (gameskill < sk_nightmare && actor->movecount)
goto nomissile;
if (!P_CheckMissileRange (actor))
goto nomissile;
P_SetMobjState (actor, actor->info->missilestate);
actor->flags |= MF_JUSTATTACKED;
return;
}
nomissile:
//
// possibly choose another target
//
if (netgame && !actor->threshold && !P_CheckSight (actor, actor->target) )
{
if (P_LookForPlayers(actor,true))
return; // got a new target
}
//
// chase towards player
//
if (--actor->movecount<0 || !P_Move (actor))
{
P_NewChaseDir (actor);
}
//
// make active sound
//
if(actor->info->activesound && P_Random() < 3)
{
if(actor->type == MT_WIZARD && P_Random() < 128)
{
S_StartSound(actor, actor->info->seesound);
}
else if(actor->type == MT_SORCERER2)
{
S_StartSound(NULL, actor->info->activesound);
}
else
{
S_StartSound(actor, actor->info->activesound);
}
}
}
//----------------------------------------------------------------------------
//
// PROC A_FaceTarget
//
//----------------------------------------------------------------------------
void A_FaceTarget(mobj_t *actor)
{
if(!actor->target)
{
return;
}
actor->flags &= ~MF_AMBUSH;
actor->angle = R_PointToAngle2(actor->x, actor->y, actor->target->x,
actor->target->y);
if(actor->target->flags&MF_SHADOW)
{ // Target is a ghost
actor->angle += (P_Random()-P_Random())<<21;
}
}
//----------------------------------------------------------------------------
//
// PROC A_Pain
//
//----------------------------------------------------------------------------
void A_Pain(mobj_t *actor)
{
if(actor->info->painsound)
{
S_StartSound(actor, actor->info->painsound);
}
}
//----------------------------------------------------------------------------
//
// PROC A_DripBlood
//
//----------------------------------------------------------------------------
void A_DripBlood(mobj_t *actor)
{
mobj_t *mo;
mo = P_SpawnMobj(actor->x+((P_Random()-P_Random())<<11),
actor->y+((P_Random()-P_Random())<<11), actor->z, MT_BLOOD);
mo->momx = (P_Random()-P_Random())<<10;
mo->momy = (P_Random()-P_Random())<<10;
mo->flags2 |= MF2_LOGRAV;
}
//----------------------------------------------------------------------------
//
// PROC A_KnightAttack
//
//----------------------------------------------------------------------------
void A_KnightAttack(mobj_t *actor)
{
if(!actor->target)
{
return;
}
if(P_CheckMeleeRange(actor))
{
P_DamageMobj(actor->target, actor, actor, HITDICE(3));
S_StartSound(actor, sfx_kgtat2);
return;
}
// Throw axe
S_StartSound(actor, actor->info->attacksound);
if(actor->type == MT_KNIGHTGHOST || P_Random() < 40)
{ // Red axe
P_SpawnMissile(actor, actor->target, MT_REDAXE);
return;
}
// Green axe
P_SpawnMissile(actor, actor->target, MT_KNIGHTAXE);
}
//----------------------------------------------------------------------------
//
// PROC A_ImpExplode
//
//----------------------------------------------------------------------------
void A_ImpExplode(mobj_t *actor)
{
mobj_t *mo;
mo = P_SpawnMobj(actor->x, actor->y, actor->z, MT_IMPCHUNK1);
mo->momx = (P_Random() - P_Random ())<<10;
mo->momy = (P_Random() - P_Random ())<<10;
mo->momz = 9*FRACUNIT;
mo = P_SpawnMobj(actor->x, actor->y, actor->z, MT_IMPCHUNK2);
mo->momx = (P_Random() - P_Random ())<<10;
mo->momy = (P_Random() - P_Random ())<<10;
mo->momz = 9*FRACUNIT;
if(actor->special1 == 666)
{ // Extreme death crash
P_SetMobjState(actor, S_IMP_XCRASH1);
}
}
//----------------------------------------------------------------------------
//
// PROC A_BeastPuff
//
//----------------------------------------------------------------------------
void A_BeastPuff(mobj_t *actor)
{
if(P_Random() > 64)
{
P_SpawnMobj(actor->x+((P_Random()-P_Random())<<10),
actor->y+((P_Random()-P_Random())<<10),
actor->z+((P_Random()-P_Random())<<10), MT_PUFFY);
}
}
//----------------------------------------------------------------------------
//
// PROC A_ImpMeAttack
//
//----------------------------------------------------------------------------
void A_ImpMeAttack(mobj_t *actor)
{
if(!actor->target)
{
return;
}
S_StartSound(actor, actor->info->attacksound);
if(P_CheckMeleeRange(actor))
{
P_DamageMobj(actor->target, actor, actor, 5+(P_Random()&7));
}
}
//----------------------------------------------------------------------------
//
// PROC A_ImpMsAttack
//
//----------------------------------------------------------------------------
void A_ImpMsAttack(mobj_t *actor)
{
mobj_t *dest;
angle_t an;
int dist;
if(!actor->target || P_Random() > 64)
{
P_SetMobjState(actor, actor->info->seestate);
return;
}
dest = actor->target;
actor->flags |= MF_SKULLFLY;
S_StartSound(actor, actor->info->attacksound);
A_FaceTarget(actor);
an = actor->angle >> ANGLETOFINESHIFT;
actor->momx = FixedMul(12*FRACUNIT, finecosine[an]);
actor->momy = FixedMul(12*FRACUNIT, finesine[an]);
dist = P_AproxDistance(dest->x-actor->x, dest->y-actor->y);
dist = dist/(12*FRACUNIT);
if(dist < 1)
{
dist = 1;
}
actor->momz = (dest->z+(dest->height>>1)-actor->z)/dist;
}
//----------------------------------------------------------------------------
//
// PROC A_ImpMsAttack2
//
// Fireball attack of the imp leader.
//
//----------------------------------------------------------------------------
void A_ImpMsAttack2(mobj_t *actor)
{
if(!actor->target)
{
return;
}
S_StartSound(actor, actor->info->attacksound);
if(P_CheckMeleeRange(actor))
{
P_DamageMobj(actor->target, actor, actor, 5+(P_Random()&7));
return;
}
P_SpawnMissile(actor, actor->target, MT_IMPBALL);
}
//----------------------------------------------------------------------------
//
// PROC A_ImpDeath
//
//----------------------------------------------------------------------------
void A_ImpDeath(mobj_t *actor)
{
actor->flags &= ~MF_SOLID;
actor->flags2 |= MF2_FOOTCLIP;
if(actor->z <= actor->floorz)
{
P_SetMobjState(actor, S_IMP_CRASH1);
}
}
//----------------------------------------------------------------------------
//
// PROC A_ImpXDeath1
//
//----------------------------------------------------------------------------
void A_ImpXDeath1(mobj_t *actor)
{
actor->flags &= ~MF_SOLID;
actor->flags |= MF_NOGRAVITY;
actor->flags2 |= MF2_FOOTCLIP;
actor->special1 = 666; // Flag the crash routine
}
//----------------------------------------------------------------------------
//
// PROC A_ImpXDeath2
//
//----------------------------------------------------------------------------
void A_ImpXDeath2(mobj_t *actor)
{