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p_enemy.c
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p_enemy.c
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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 Simon Howard
//
// 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:
// Enemy thinking, AI.
// Action Pointer Functions
// that are associated with states/frames.
//
//-----------------------------------------------------------------------------
#include "m_random.h"
#include "i_system.h"
#include "doomdef.h"
#include "p_local.h"
#include "s_sound.h"
#include "g_game.h"
// State.
#include "doomstat.h"
#include "r_state.h"
// Data.
#include "sounds.h"
typedef enum {
DI_EAST,
DI_NORTHEAST,
DI_NORTH,
DI_NORTHWEST,
DI_WEST,
DI_SOUTHWEST,
DI_SOUTH,
DI_SOUTHEAST,
DI_NODIR,
NUMDIRS
} dirtype_t;
//
// P_NewChaseDir related LUT.
//
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 A_Fall(mobj_t * actor);
//
// ENEMY THINKING
// Enemies are allways spawned
// with targetplayer = -1, threshold = 0
// Most monsters are spawned unaware of all players,
// but some can be made preaware
//
//
// Called by P_NoiseAlert.
// Recursively traverse adjacent sectors,
// sound blocking lines cut off traversal.
//
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) {
return; // already flooded
}
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)
continue; // closed door
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);
}
}
//
// 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);
}
//
// P_CheckMeleeRange
//
boolean P_CheckMeleeRange(mobj_t * actor)
{
mobj_t *pl;
fixed_t dist;
if (!actor->target)
return false;
pl = actor->target;
dist = P_AproxDistance(pl->x - actor->x, pl->y - actor->y);
if (dist >= MELEERANGE - 20 * FRACUNIT + pl->info->radius)
return false;
if (!P_CheckSight(actor, actor->target))
return false;
return true;
}
//
// 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)
return false; // do not attack yet
// OPTIMIZE: get this from a global checksight
dist = P_AproxDistance(actor->x - actor->target->x,
actor->y - actor->target->y) - 64 * FRACUNIT;
if (!actor->info->meleestate)
dist -= 128 * FRACUNIT; // no melee attack, so fire more
dist >>= 16;
if (actor->type == MT_VILE) {
if (dist > 14 * 64)
return false; // too far away
}
if (actor->type == MT_UNDEAD) {
if (dist < 196)
return false; // close for fist attack
dist >>= 1;
}
if (actor->type == MT_CYBORG
|| actor->type == MT_SPIDER || actor->type == MT_SKULL) {
dist >>= 1;
}
if (dist > 200)
dist = 200;
if (actor->type == MT_CYBORG && dist > 160)
dist = 160;
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;
fixed_t tryy;
line_t *ld;
// warning: 'catch', 'throw', and 'try'
// are all C++ reserved words
boolean try_ok;
boolean good;
if (actor->movedir == DI_NODIR)
return false;
if ((unsigned)actor->movedir >= 8)
I_Error("Weird actor->movedir!");
tryx = actor->x + actor->info->speed * xspeed[actor->movedir];
tryy = actor->y + actor->info->speed * yspeed[actor->movedir];
try_ok = P_TryMove(actor, tryx, tryy);
if (!try_ok) {
// 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 is not a door
// that can be opened,
// return false
if (P_UseSpecialLine(actor, ld, 0))
good = true;
}
return good;
} else {
actor->flags &= ~MF_INFLOAT;
}
if (!(actor->flags & MF_FLOAT))
actor->z = actor->floorz;
return true;
}
//
// TryWalk
// Attempts to move actor on
// in its current (ob->moveangle) direction.
// If blocked by either a wall or an actor
// returns FALSE
// If move is either clear or blocked 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;
}
void P_NewChaseDir(mobj_t * actor)
{
fixed_t deltax;
fixed_t deltay;
dirtype_t d[3];
int tdir;
dirtype_t olddir;
dirtype_t 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 != (int)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)) {
// either moved forward or attacked
return;
}
}
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;
}
// randomly determine direction of search
if (P_Random() & 1) {
for (tdir = DI_EAST; tdir <= DI_SOUTHEAST; tdir++) {
if (tdir != (int)turnaround) {
actor->movedir = tdir;
if (P_TryWalk(actor))
return;
}
}
} else {
for (tdir = DI_SOUTHEAST; tdir != (DI_EAST - 1); tdir--) {
if (tdir != (int)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 not move
}
//
// 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;
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) {
// done looking
return false;
}
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
}
}
actor->target = player->mo;
return true;
}
return false;
}
//
// A_KeenDie
// DOOM II special, map 32.
// Uses special tag 666.
//
void A_KeenDie(mobj_t * mo)
{
thinker_t *th;
mobj_t *mo2;
line_t junk;
A_Fall(mo);
// scan the remaining thinkers
// to see if all Keens are dead
for (th = thinkercap.next; th != &thinkercap; th = th->next) {
if (th->function.acp1 != (actionf_p1) P_MobjThinker)
continue;
mo2 = (mobj_t *) th;
if (mo2 != mo && mo2->type == mo->type && mo2->health > 0) {
// other Keen not dead
return;
}
}
junk.tag = 666;
EV_DoDoor(&junk, open);
}
//
// 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;
}
if (actor->type == MT_SPIDER || actor->type == MT_CYBORG) {
// 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) {
if (!actor->target || actor->target->health <= 0) {
actor->threshold = 0;
} else
actor->threshold--;
}
// 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))
return; // got a new target
P_SetMobjState(actor, actor->info->spawnstate);
return;
}
// do not attack twice in a row
if (actor->flags & MF_JUSTATTACKED) {
actor->flags &= ~MF_JUSTATTACKED;
if (gameskill != sk_nightmare && !fastparm)
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 && !fastparm && 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) {
S_StartSound(actor, actor->info->activesound);
}
}
//
// 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)
actor->angle += (P_Random() - P_Random()) << 21;
}
//
// A_PosAttack
//
void A_PosAttack(mobj_t * actor)
{
int angle;
int damage;
int slope;
if (!actor->target)
return;
A_FaceTarget(actor);
angle = actor->angle;
slope = P_AimLineAttack(actor, angle, MISSILERANGE);
S_StartSound(actor, sfx_pistol);
angle += (P_Random() - P_Random()) << 20;
damage = ((P_Random() % 5) + 1) * 3;
P_LineAttack(actor, angle, MISSILERANGE, slope, damage);
}
void A_SPosAttack(mobj_t * actor)
{
int i;
int angle;
int bangle;
int damage;
int slope;
if (!actor->target)
return;
S_StartSound(actor, sfx_shotgn);
A_FaceTarget(actor);
bangle = actor->angle;
slope = P_AimLineAttack(actor, bangle, MISSILERANGE);
for (i = 0; i < 3; i++) {
angle = bangle + ((P_Random() - P_Random()) << 20);
damage = ((P_Random() % 5) + 1) * 3;
P_LineAttack(actor, angle, MISSILERANGE, slope, damage);
}
}
void A_CPosAttack(mobj_t * actor)
{
int angle;
int bangle;
int damage;
int slope;
if (!actor->target)
return;
S_StartSound(actor, sfx_shotgn);
A_FaceTarget(actor);
bangle = actor->angle;
slope = P_AimLineAttack(actor, bangle, MISSILERANGE);
angle = bangle + ((P_Random() - P_Random()) << 20);
damage = ((P_Random() % 5) + 1) * 3;
P_LineAttack(actor, angle, MISSILERANGE, slope, damage);
}
void A_CPosRefire(mobj_t * actor)
{
// keep firing unless target got out of sight
A_FaceTarget(actor);
if (P_Random() < 40)
return;
if (!actor->target
|| actor->target->health <= 0
|| !P_CheckSight(actor, actor->target)) {
P_SetMobjState(actor, actor->info->seestate);
}
}
void A_SpidRefire(mobj_t * actor)
{
// keep firing unless target got out of sight
A_FaceTarget(actor);
if (P_Random() < 10)
return;
if (!actor->target
|| actor->target->health <= 0
|| !P_CheckSight(actor, actor->target)) {
P_SetMobjState(actor, actor->info->seestate);
}
}
void A_BspiAttack(mobj_t * actor)
{
if (!actor->target)
return;
A_FaceTarget(actor);
// launch a missile
P_SpawnMissile(actor, actor->target, MT_ARACHPLAZ);
}
//
// A_TroopAttack
//
void A_TroopAttack(mobj_t * actor)
{
int damage;
if (!actor->target)
return;
A_FaceTarget(actor);
if (P_CheckMeleeRange(actor)) {
S_StartSound(actor, sfx_claw);
damage = (P_Random() % 8 + 1) * 3;
P_DamageMobj(actor->target, actor, actor, damage);
return;
}
// launch a missile
P_SpawnMissile(actor, actor->target, MT_TROOPSHOT);
}
void A_SargAttack(mobj_t * actor)
{
int damage;
if (!actor->target)
return;
A_FaceTarget(actor);
if (P_CheckMeleeRange(actor)) {
damage = ((P_Random() % 10) + 1) * 4;
P_DamageMobj(actor->target, actor, actor, damage);
}
}
void A_HeadAttack(mobj_t * actor)
{
int damage;
if (!actor->target)
return;
A_FaceTarget(actor);
if (P_CheckMeleeRange(actor)) {
damage = (P_Random() % 6 + 1) * 10;
P_DamageMobj(actor->target, actor, actor, damage);
return;
}
// launch a missile
P_SpawnMissile(actor, actor->target, MT_HEADSHOT);
}
void A_CyberAttack(mobj_t * actor)
{
if (!actor->target)
return;
A_FaceTarget(actor);
P_SpawnMissile(actor, actor->target, MT_ROCKET);
}
void A_BruisAttack(mobj_t * actor)
{
int damage;
if (!actor->target)
return;
if (P_CheckMeleeRange(actor)) {
S_StartSound(actor, sfx_claw);
damage = (P_Random() % 8 + 1) * 10;
P_DamageMobj(actor->target, actor, actor, damage);
return;
}
// launch a missile
P_SpawnMissile(actor, actor->target, MT_BRUISERSHOT);
}
//
// A_SkelMissile
//
void A_SkelMissile(mobj_t * actor)
{
mobj_t *mo;
if (!actor->target)
return;
A_FaceTarget(actor);
actor->z += 16 * FRACUNIT; // so missile spawns higher
mo = P_SpawnMissile(actor, actor->target, MT_TRACER);
actor->z -= 16 * FRACUNIT; // back to normal
mo->x += mo->momx;
mo->y += mo->momy;
mo->tracer = actor->target;
}
int TRACEANGLE = 0xc000000;
void A_Tracer(mobj_t * actor)
{
angle_t exact;
fixed_t dist;
fixed_t slope;
mobj_t *dest;
mobj_t *th;
if (gametic & 3)
return;
// spawn a puff of smoke behind the rocket
P_SpawnPuff(actor->x, actor->y, actor->z);
th = P_SpawnMobj(actor->x - actor->momx,
actor->y - actor->momy, actor->z, MT_SMOKE);
th->momz = FRACUNIT;
th->tics -= P_Random() & 3;
if (th->tics < 1)
th->tics = 1;
// adjust direction
dest = actor->tracer;
if (!dest || dest->health <= 0)
return;
// change angle
exact = R_PointToAngle2(actor->x, actor->y, dest->x, dest->y);
if (exact != actor->angle) {
if (exact - actor->angle > 0x80000000) {
actor->angle -= TRACEANGLE;
if (exact - actor->angle < 0x80000000)
actor->angle = exact;
} else {
actor->angle += TRACEANGLE;
if (exact - actor->angle > 0x80000000)
actor->angle = exact;
}
}
exact = actor->angle >> ANGLETOFINESHIFT;
actor->momx = FixedMul(actor->info->speed, finecosine[exact]);
actor->momy = FixedMul(actor->info->speed, finesine[exact]);
// change slope
dist = P_AproxDistance(dest->x - actor->x, dest->y - actor->y);
dist = dist / actor->info->speed;
if (dist < 1)
dist = 1;
slope = (dest->z + 40 * FRACUNIT - actor->z) / dist;
if (slope < actor->momz)
actor->momz -= FRACUNIT / 8;
else
actor->momz += FRACUNIT / 8;
}
void A_SkelWhoosh(mobj_t * actor)
{
if (!actor->target)
return;
A_FaceTarget(actor);
S_StartSound(actor, sfx_skeswg);
}
void A_SkelFist(mobj_t * actor)
{
int damage;
if (!actor->target)
return;
A_FaceTarget(actor);
if (P_CheckMeleeRange(actor)) {
damage = ((P_Random() % 10) + 1) * 6;
S_StartSound(actor, sfx_skepch);
P_DamageMobj(actor->target, actor, actor, damage);
}
}
//
// PIT_VileCheck
// Detect a corpse that could be raised.
//
mobj_t *corpsehit;
mobj_t *vileobj;
fixed_t viletryx;
fixed_t viletryy;
boolean PIT_VileCheck(mobj_t * thing)
{
int maxdist;
boolean check;
if (!(thing->flags & MF_CORPSE))
return true; // not a monster
if (thing->tics != -1)
return true; // not lying still yet
if (thing->info->raisestate == S_NULL)
return true; // monster doesn't have a raise state
maxdist = thing->info->radius + mobjinfo[MT_VILE].radius;
if (abs(thing->x - viletryx) > maxdist
|| abs(thing->y - viletryy) > maxdist)
return true; // not actually touching
corpsehit = thing;
corpsehit->momx = corpsehit->momy = 0;
corpsehit->height <<= 2;
check = P_CheckPosition(corpsehit, corpsehit->x, corpsehit->y);
corpsehit->height >>= 2;
if (!check)
return true; // doesn't fit here
return false; // got one, so stop checking
}
//
// A_VileChase