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wl_state.c
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wl_state.c
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#include "wl_def.h"
/*
=============================================================================
GLOBAL VARIABLES
=============================================================================
*/
static const dirtype opposite[9] =
{west,southwest,south,southeast,east,northeast,north,northwest,nodir};
static const dirtype diagonal[9][9] =
{
/* east */ {nodir,nodir,northeast,nodir,nodir,nodir,southeast,nodir,nodir},
{nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir},
/* north */ {northeast,nodir,nodir,nodir,northwest,nodir,nodir,nodir,nodir},
{nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir},
/* west */ {nodir,nodir,northwest,nodir,nodir,nodir,southwest,nodir,nodir},
{nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir},
/* south */ {southeast,nodir,nodir,nodir,southwest,nodir,nodir,nodir,nodir},
{nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir},
{nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir,nodir}
};
void FirstSighting (objtype *ob);
//===========================================================================
/*
===================
=
= SpawnNewObj
=
= Spaws a new actor at the given TILE coordinates, with the given state, and
= the given size in GLOBAL units.
=
= new = a pointer to an initialized new actor
=
===================
*/
void SpawnNewObj(unsigned tilex, unsigned tiley, myint state) /* stateenum */
{
GetNewActor();
new->state = state;
if (gamestates[state].tictime)
new->ticcount = US_RndT () % gamestates[state].tictime;
else
new->ticcount = 0;
new->tilex = tilex;
new->tiley = tiley;
new->x = ((long)tilex<<TILESHIFT)+TILEGLOBAL/2;
new->y = ((long)tiley<<TILESHIFT)+TILEGLOBAL/2;
new->dir = nodir;
move_actor(new);
}
/*
===================
=
= NewState
=
= Changes ob to a new state, setting ticcount to the max for that state
=
===================
*/
void NewState(objtype *ob, myint state) /* stateenum */
{
ob->state = state;
ob->ticcount = gamestates[state].tictime;
}
/*
=============================================================================
ENEMY TILE WORLD MOVEMENT CODE
=============================================================================
*/
/*
==================================
=
= TryWalk
=
= Attempts to move ob in its current (ob->dir) 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
=
= ob->tilex = new destination
= ob->tiley
= ob->areanumber = the floor tile number (0-(NUMAREAS-1)) of destination
= ob->distance = TILEGLOBAL, or -doornumber if a door is blocking the way
=
= If a door is in the way, an OpenDoor call is made to start it opening.
= The actor code should wait until
= doorobjlist[-ob->distance].action = dr_open, meaning the door has been
= fully opened
=
==================================
*/
// FIXME: These tests could be reordering to optimize.
#define CHECKDIAG(x,y) \
{ \
if (any_actor_at(x, y)) \
{ \
if (!obj_actor_at(x, y)) \
return false; \
if (objlist[get_actor_at(x, y)].flags & FL_SHOOTABLE) \
return false; \
} \
}
#define CHECKSIDE(x,y) \
{ \
if (any_actor_at(x, y)) \
{ \
if (wall_actor_at(x, y)) \
return false; \
if (!obj_actor_at(x, y)) \
doornum = get_actor_at(x, y); \
else if (objlist[get_actor_at(x, y)].flags & FL_SHOOTABLE) \
return false; \
} \
}
boolean TryWalk(objtype *ob)
{
myint doornum;
int tilex, tiley;
doornum = -1;
tilex = ob->tilex;
tiley = ob->tiley;
if (ob->obclass == inertobj)
{
switch (ob->dir)
{
case north:
tiley--;
break;
case northeast:
tilex++;
tiley--;
break;
case east:
tilex++;
break;
case southeast:
tilex++;
tiley++;
break;
case south:
tiley++;
break;
case southwest:
tilex--;
tiley++;
break;
case west:
tilex--;
break;
case northwest:
tilex--;
tiley--;
break;
default:
break;
}
}
else
switch (ob->dir)
{
case north:
if (ob->obclass == dogobj || ob->obclass == fakeobj)
{
CHECKDIAG(tilex,tiley-1);
}
else
{
CHECKSIDE(tilex,tiley-1);
}
tiley--;
break;
case northeast:
CHECKDIAG(tilex+1,tiley-1);
CHECKDIAG(tilex+1,tiley);
CHECKDIAG(tilex,tiley-1);
tilex++;
tiley--;
break;
case east:
if (ob->obclass == dogobj || ob->obclass == fakeobj)
{
CHECKDIAG(tilex+1,tiley);
}
else
{
CHECKSIDE(tilex+1,tiley);
}
tilex++;
break;
case southeast:
CHECKDIAG(tilex+1,tiley+1);
CHECKDIAG(tilex+1,tiley);
CHECKDIAG(tilex,tiley+1);
tilex++;
tiley++;
break;
case south:
if (ob->obclass == dogobj || ob->obclass == fakeobj)
{
CHECKDIAG(tilex,tiley+1);
}
else
{
CHECKSIDE(tilex,tiley+1);
}
tiley++;
break;
case southwest:
CHECKDIAG(tilex-1,tiley+1);
CHECKDIAG(tilex-1,tiley);
CHECKDIAG(tilex,tiley+1);
tilex--;
tiley++;
break;
case west:
if (ob->obclass == dogobj || ob->obclass == fakeobj)
{
CHECKDIAG(tilex-1,tiley);
}
else
{
CHECKSIDE(tilex-1,tiley);
}
tilex--;
break;
case northwest:
CHECKDIAG(tilex-1,tiley-1);
CHECKDIAG(tilex-1,tiley);
CHECKDIAG(tilex,tiley-1);
tilex--;
tiley--;
break;
case nodir:
return false;
default:
Quit ("Walk: Bad dir");
}
ob->tilex = tilex;
ob->tiley = tiley;
if (doornum != -1)
{
OpenDoor (doornum);
ob->distance = -doornum-1;
return true;
}
ob->areanumber =
*(mapseg0 + farmapylookup(tiley)+tilex) - AREATILE;
ob->distance = TILEGLOBAL;
return true;
}
/*
==================================
=
= SelectDodgeDir
=
= Attempts to choose and initiate a movement for ob that sends it towards
= the player while dodging
=
= If there is no possible move (ob is totally surrounded)
=
= ob->dir = nodir
=
= Otherwise
=
= ob->dir = new direction to follow
= ob->distance = TILEGLOBAL or -doornumber
= ob->tilex = new destination
= ob->tiley
= ob->areanumber = the floor tile number (0-(NUMAREAS-1)) of destination
=
==================================
*/
void SelectDodgeDir(objtype *ob)
{
myint deltax,deltay,i;
unsigned absdx,absdy;
dirtype dirtry[5];
dirtype turnaround,tdir;
if (ob->flags & FL_FIRSTATTACK)
{
//
// turning around is only ok the very first time after noticing the
// player
//
turnaround = nodir;
ob->flags &= ~FL_FIRSTATTACK;
}
else
turnaround=opposite[ob->dir];
deltax = player->tilex - ob->tilex;
deltay = player->tiley - ob->tiley;
//
// arange 5 direction choices in order of preference
// the four cardinal directions plus the diagonal straight towards
// the player
//
if (deltax>0)
{
dirtry[1]= east;
dirtry[3]= west;
}
else
{
dirtry[1]= west;
dirtry[3]= east;
}
if (deltay>0)
{
dirtry[2]= south;
dirtry[4]= north;
}
else
{
dirtry[2]= north;
dirtry[4]= south;
}
//
// randomize a bit for dodging
//
absdx = abs(deltax);
absdy = abs(deltay);
if (absdx > absdy)
{
tdir = dirtry[1];
dirtry[1] = dirtry[2];
dirtry[2] = tdir;
tdir = dirtry[3];
dirtry[3] = dirtry[4];
dirtry[4] = tdir;
}
if (US_RndT() < 128)
{
tdir = dirtry[1];
dirtry[1] = dirtry[2];
dirtry[2] = tdir;
tdir = dirtry[3];
dirtry[3] = dirtry[4];
dirtry[4] = tdir;
}
dirtry[0] = diagonal [ dirtry[1] ] [ dirtry[2] ];
//
// try the directions util one works
//
for (i=0;i<5;i++)
{
if ( dirtry[i] == nodir || dirtry[i] == turnaround)
continue;
ob->dir = dirtry[i];
if (TryWalk(ob))
return;
}
//
// turn around only as a last resort
//
if (turnaround != nodir)
{
ob->dir = turnaround;
if (TryWalk(ob))
return;
}
ob->dir = nodir;
}
/*
============================
=
= SelectChaseDir
=
= As SelectDodgeDir, but doesn't try to dodge
=
============================
*/
void SelectChaseDir(objtype *ob)
{
myint deltax,deltay;
dirtype d[3];
dirtype tdir, olddir, turnaround;
olddir=ob->dir;
turnaround=opposite[olddir];
deltax=player->tilex - ob->tilex;
deltay=player->tiley - ob->tiley;
d[1]=nodir;
d[2]=nodir;
if (deltax>0)
d[1]= east;
else if (deltax<0)
d[1]= west;
if (deltay>0)
d[2]=south;
else if (deltay<0)
d[2]=north;
if (abs(deltay)>abs(deltax))
{
tdir=d[1];
d[1]=d[2];
d[2]=tdir;
}
if (d[1]==turnaround)
d[1]=nodir;
if (d[2]==turnaround)
d[2]=nodir;
if (d[1]!=nodir)
{
ob->dir=d[1];
if (TryWalk(ob))
return; /*either moved forward or attacked*/
}
if (d[2]!=nodir)
{
ob->dir=d[2];
if (TryWalk(ob))
return;
}
/* there is no direct path to the player, so pick another direction */
if (olddir!=nodir)
{
ob->dir=olddir;
if (TryWalk(ob))
return;
}
if (US_RndT()>128) /*randomly determine direction of search*/
{
for (tdir=north;tdir<=west;tdir++)
{
if (tdir!=turnaround)
{
ob->dir=tdir;
if ( TryWalk(ob) )
return;
}
}
}
else
{
for (tdir=west;tdir>=north;tdir--)
{
if (tdir!=turnaround)
{
ob->dir=tdir;
if ( TryWalk(ob) )
return;
}
}
}
if (turnaround != nodir)
{
ob->dir=turnaround;
if (ob->dir != nodir)
{
if ( TryWalk(ob) )
return;
}
}
ob->dir = nodir; // can't move
}
/*
============================
=
= SelectRunDir
=
= Run Away from player
=
============================
*/
void SelectRunDir (objtype *ob)
{
myint deltax, deltay;
dirtype d[3];
dirtype tdir;
deltax=player->tilex - ob->tilex;
deltay=player->tiley - ob->tiley;
if (deltax<0)
d[1]= east;
else
d[1]= west;
if (deltay<0)
d[2]=south;
else
d[2]=north;
if (abs(deltay)>abs(deltax))
{
tdir=d[1];
d[1]=d[2];
d[2]=tdir;
}
ob->dir=d[1];
if (TryWalk(ob))
return; /*either moved forward or attacked*/
ob->dir=d[2];
if (TryWalk(ob))
return;
/* there is no direct path to the player, so pick another direction */
if (US_RndT()>128) /*randomly determine direction of search*/
{
for (tdir=north;tdir<=west;tdir++)
{
ob->dir=tdir;
if ( TryWalk(ob) )
return;
}
}
else
{
for (tdir=west;tdir>=north;tdir--)
{
ob->dir=tdir;
if ( TryWalk(ob) )
return;
}
}
ob->dir = nodir; // can't move
}
/*
=================
=
= MoveObj
=
= Moves ob be move global units in ob->dir direction
= Actors are not allowed to move inside the player
= Does NOT check to see if the move is tile map valid
=
= ob->x = adjusted for new position
= ob->y
=
=================
*/
void MoveObj (objtype *ob, long move)
{
long deltax,deltay;
long x, y;
x = ob->x;
y = ob->y;
switch (ob->dir)
{
case north:
y -= move;
break;
case northeast:
x += move;
y -= move;
break;
case east:
x += move;
break;
case southeast:
x += move;
y += move;
break;
case south:
y += move;
break;
case southwest:
x -= move;
y += move;
break;
case west:
x -= move;
break;
case northwest:
x -= move;
y -= move;
break;
case nodir:
return;
default:
Quit ("MoveObj: bad dir!");
}
//
// check to make sure it's not on top of player
//
if (getareabyplayer(ob->areanumber))
{
deltax = x - player->x;
if (deltax < -MINACTORDIST || deltax > MINACTORDIST)
goto moveok;
deltay = y - player->y;
if (deltay < -MINACTORDIST || deltay > MINACTORDIST)
goto moveok;
if (ob->obclass == ghostobj || ob->obclass == spectreobj)
TakeDamage (tics*2,ob);
return;
}
moveok:
ob->x = x;
ob->y = y;
ob->distance -=move;
}
/*
=============================================================================
STUFF
=============================================================================
*/
/*
===============
=
= KillActor
=
===============
*/
void KillActor (objtype *ob)
{
myint tilex,tiley;
int points;
int newstate;
tilex = ob->tilex = ob->x >> TILESHIFT; // drop item on center
tiley = ob->tiley = ob->y >> TILESHIFT;
switch (ob->obclass)
{
case guardobj:
points = 100;
newstate = s_grddie1;
PlaceItemType (bo_clip2,tilex,tiley);
break;
case officerobj:
points = 400;
newstate = s_ofcdie1;
PlaceItemType (bo_clip2,tilex,tiley);
break;
case mutantobj:
points = 700;
newstate = s_mutdie1;
PlaceItemType (bo_clip2,tilex,tiley);
break;
case ssobj:
points = 500;
newstate = s_ssdie1;
if (gamestate.bestweapon < wp_machinegun)
PlaceItemType (bo_machinegun,tilex,tiley);
else
PlaceItemType (bo_clip2,tilex,tiley);
break;
case dogobj:
points = 200;
newstate = s_dogdie1;
break;
#ifndef SPEAR
case bossobj:
points = 5000;
newstate = s_bossdie1;
PlaceItemType (bo_key1,tilex,tiley);
break;
case gretelobj:
points = 5000;
newstate = s_greteldie1;
PlaceItemType (bo_key1,tilex,tiley);
break;
case giftobj:
points = 5000;
gamestate.killx = player->x;
gamestate.killy = player->y;
newstate = s_giftdie1;
break;
case fatobj:
points = 5000;
gamestate.killx = player->x;
gamestate.killy = player->y;
newstate = s_fatdie1;
break;
case schabbobj:
points = 5000;
gamestate.killx = player->x;
gamestate.killy = player->y;
newstate = s_schabbdie1;
A_DeathScream(ob);
break;
case fakeobj:
points = 2000;
newstate = s_fakedie1;
break;
case mechahitlerobj:
points = 5000;
newstate = s_mechadie1;
break;
case realhitlerobj:
points = 5000;
gamestate.killx = player->x;
gamestate.killy = player->y;
newstate = s_hitlerdie1;
A_DeathScream(ob);
break;
#else
case spectreobj:
points = 200;
newstate = s_spectredie1;
break;
case angelobj:
points = 5000;
newstate = s_angeldie1;
break;
case transobj:
points = 5000;
newstate = s_transdie0;
PlaceItemType (bo_key1,tilex,tiley);
break;
case uberobj:
points = 5000;
newstate = s_uberdie0;
PlaceItemType (bo_key1,tilex,tiley);
break;
case willobj:
points = 5000;
newstate = s_willdie1;
PlaceItemType (bo_key1,tilex,tiley);
break;
case deathobj:
points = 5000;
newstate = s_deathdie1;
PlaceItemType (bo_key1,tilex,tiley);
break;
#endif
default:
points = 0;
newstate = ob->state;
break;
}
GivePoints(points);
NewState (ob, newstate);
#ifdef ENABLE_STATS
gamestate.killcount++;
#endif
ob->flags &= ~FL_SHOOTABLE;
clear_actor(ob->tilex, ob->tiley);
ob->flags |= FL_NONMARK;
}
/*
===================
=
= DamageActor
=
= Called when the player succesfully hits an enemy.
=
= Does damage points to enemy ob, either putting it into a stun frame or
= killing it.
=
===================
*/
void DamageActor (objtype *ob, unsigned damage)
{
madenoise = true;
//
// do double damage if shooting a non attack mode actor
//
if ( !(ob->flags & FL_ATTACKMODE) )
damage <<= 1;
ob->hitpoints -= damage;
if (ob->hitpoints<=0)
KillActor (ob);
else
{
if (! (ob->flags & FL_ATTACKMODE) )
FirstSighting (ob); // put into combat mode
switch (ob->obclass) // dogs only have one hit point
{
case guardobj:
if (ob->hitpoints&1)
NewState (ob,s_grdpain);
else
NewState (ob,s_grdpain1);
break;
case officerobj:
if (ob->hitpoints&1)
NewState (ob,s_ofcpain);
else
NewState (ob,s_ofcpain1);
break;
case mutantobj:
if (ob->hitpoints&1)
NewState (ob,s_mutpain);
else
NewState (ob,s_mutpain1);
break;
case ssobj:
if (ob->hitpoints&1)
NewState (ob,s_sspain);
else
NewState (ob,s_sspain1);
break;
default:
break;
}
}
}
/*
=============================================================================
CHECKSIGHT
=============================================================================
*/
/*
=====================
=
= CheckLine
=
= Returns true if a straight line between the player and ob is unobstructed
=
=====================
*/
boolean CheckLine (objtype *ob)
{
myint x1,y1,xt1,yt1,x2,y2,xt2,yt2;
myint x,y;
myint xdist,ydist,xstep,ystep;
myint partial,delta;
long ltemp;
myint xfrac,yfrac,deltafrac;
word value,intercept;
x1 = ob->x >> UNSIGNEDSHIFT; // 1/256 tile precision
y1 = ob->y >> UNSIGNEDSHIFT;
xt1 = x1 >> 8;
yt1 = y1 >> 8;
x2 = plux;
y2 = pluy;
xt2 = player->tilex;
yt2 = player->tiley;
xdist = abs(xt2-xt1);
if (xdist > 0)
{
if (xt2 > xt1)
{
partial = 256-(x1&0xff);
xstep = 1;
}
else
{
partial = x1&0xff;
xstep = -1;
}
deltafrac = abs(x2-x1);
delta = y2-y1;
ltemp = ((long)delta<<8)/deltafrac;
if (ltemp > 0x7fffl)
ystep = 0x7fff;
else if (ltemp < -0x7fffl)
ystep = -0x7fff;
else
ystep = ltemp;
yfrac = y1 + (((long)ystep*partial) >>8);
x = xt1+xstep;
xt2 += xstep;
do
{
y = yfrac>>8;
yfrac += ystep;
value = (unsigned)tilemap[x][y];
x += xstep;
if (!value)
continue;
if (value<128 || value>256)
return false;
//
// see if the door is open enough