g_monster.c

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/*
Copyright (C) 1997-2001 Id Software, Inc.
 
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.
 
*/
#include "g_local.h"
 
 
//
// monster weapons
//
 
//FIXME mosnters should call these with a totally accurate direction
// and we can mess it up based on skill.  Spread should be for normal
// and we can tighten or loosen based on skill.  We could muck with
// the damages too, but I'm not sure that's such a good idea.
void monster_fire_bullet (edict_t *self, vec3_t start, vec3_t dir, int damage, int kick, int hspread, int vspread, int flashtype)
{
    fire_bullet (self, start, dir, damage, kick, hspread, vspread, MOD_UNKNOWN);
 
    gi.WriteByte (svc_muzzleflash2);
    gi.WriteShort (self - g_edicts);
    gi.WriteByte (flashtype);
    gi.multicast (start, MULTICAST_PVS);
}
 
void monster_fire_shotgun (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int kick, int hspread, int vspread, int count, int flashtype)
{
    fire_shotgun (self, start, aimdir, damage, kick, hspread, vspread, count, MOD_UNKNOWN);
 
    gi.WriteByte (svc_muzzleflash2);
    gi.WriteShort (self - g_edicts);
    gi.WriteByte (flashtype);
    gi.multicast (start, MULTICAST_PVS);
}
 
void monster_fire_blaster (edict_t *self, vec3_t start, vec3_t dir, int damage, int speed, int flashtype, int effect)
{
    fire_blaster (self, start, dir, damage, speed, effect, false);
 
    gi.WriteByte (svc_muzzleflash2);
    gi.WriteShort (self - g_edicts);
    gi.WriteByte (flashtype);
    gi.multicast (start, MULTICAST_PVS);
}   
 
void monster_fire_grenade (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int speed, int flashtype)
{
    fire_grenade (self, start, aimdir, damage, speed, 2.5, damage+40);
 
    gi.WriteByte (svc_muzzleflash2);
    gi.WriteShort (self - g_edicts);
    gi.WriteByte (flashtype);
    gi.multicast (start, MULTICAST_PVS);
}
 
void monster_fire_rocket (edict_t *self, vec3_t start, vec3_t dir, int damage, int speed, int flashtype)
{
    fire_rocket (self, start, dir, damage, speed, damage+20, damage);
 
    gi.WriteByte (svc_muzzleflash2);
    gi.WriteShort (self - g_edicts);
    gi.WriteByte (flashtype);
    gi.multicast (start, MULTICAST_PVS);
}   
 
void monster_fire_railgun (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int kick, int flashtype)
{
    fire_rail (self, start, aimdir, damage, kick);
 
    gi.WriteByte (svc_muzzleflash2);
    gi.WriteShort (self - g_edicts);
    gi.WriteByte (flashtype);
    gi.multicast (start, MULTICAST_PVS);
}
 
void monster_fire_bfg (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int speed, int kick, float damage_radius, int flashtype)
{
    fire_bfg (self, start, aimdir, damage, speed, damage_radius);
 
    gi.WriteByte (svc_muzzleflash2);
    gi.WriteShort (self - g_edicts);
    gi.WriteByte (flashtype);
    gi.multicast (start, MULTICAST_PVS);
}
 
 
 
//
// Monster utility functions
//
 
static void M_FliesOff (edict_t *self)
{
    self->s.effects &= ~EF_FLIES;
    self->s.sound = 0;
}
 
static void M_FliesOn (edict_t *self)
{
    if (self->waterlevel)
        return;
    self->s.effects |= EF_FLIES;
    self->s.sound = gi.soundindex ("infantry/inflies1.wav");
    self->think = M_FliesOff;
    self->nextthink = level.time + 60;
}
 
void M_FlyCheck (edict_t *self)
{
    if (self->waterlevel)
        return;
 
    if (random() > 0.5)
        return;
 
    self->think = M_FliesOn;
    self->nextthink = level.time + 5 + 10 * random();
}
 
void AttackFinished (edict_t *self, float time)
{
    self->monsterinfo.attack_finished = level.time + time;
}
 
 
void M_CheckGround (edict_t *ent)
{
    vec3_t      point;
    trace_t     trace;
 
    if (ent->flags & (FL_SWIM|FL_FLY))
        return;
 
    if (ent->velocity[2] > 100)
    {
        ent->groundentity = NULL;
        return;
    }
 
// if the hull point one-quarter unit down is solid the entity is on ground
    point[0] = ent->s.origin[0];
    point[1] = ent->s.origin[1];
    point[2] = ent->s.origin[2] - 0.25;
 
    trace = gi.trace (ent->s.origin, ent->mins, ent->maxs, point, ent, MASK_MONSTERSOLID);
 
    // check steepness
    if ( trace.plane.normal[2] < 0.7 && !trace.startsolid)
    {
        ent->groundentity = NULL;
        return;
    }
 
//  ent->groundentity = trace.ent;
//  ent->groundentity_linkcount = trace.ent->linkcount;
//  if (!trace.startsolid && !trace.allsolid)
//      VectorCopy (trace.endpos, ent->s.origin);
    if (!trace.startsolid && !trace.allsolid)
    {
        VectorCopy (trace.endpos, ent->s.origin);
        ent->groundentity = trace.ent;
        ent->groundentity_linkcount = trace.ent->linkcount;
        ent->velocity[2] = 0;
    }
}
 
 
void M_CatagorizePosition (edict_t *ent)
{
    vec3_t      point;
    int         cont;
 
//
// get waterlevel
//
    point[0] = ent->s.origin[0];
    point[1] = ent->s.origin[1];
    point[2] = ent->s.origin[2] + ent->mins[2] + 1; 
    cont = gi.pointcontents (point);
 
    if (!(cont & MASK_WATER))
    {
        ent->waterlevel = 0;
        ent->watertype = 0;
        return;
    }
 
    ent->watertype = cont;
    ent->waterlevel = 1;
    point[2] += 26;
    cont = gi.pointcontents (point);
    if (!(cont & MASK_WATER))
        return;
 
    ent->waterlevel = 2;
    point[2] += 22;
    cont = gi.pointcontents (point);
    if (cont & MASK_WATER)
        ent->waterlevel = 3;
}
 
 
void M_WorldEffects (edict_t *ent)
{
    int     dmg;
 
    if (ent->health > 0)
    {
        if (!(ent->flags & FL_SWIM))
        {
            if (ent->waterlevel < 3)
            {
                ent->air_finished = level.time + 12;
            }
            else if (ent->air_finished < level.time)
            {   // drown!
                if (ent->pain_debounce_time < level.time)
                {
                    dmg = 2 + 2 * floor(level.time - ent->air_finished);
                    if (dmg > 15)
                        dmg = 15;
                    T_Damage (ent, world, world, vec3_origin, ent->s.origin, vec3_origin, dmg, 0, DAMAGE_NO_ARMOR, MOD_WATER);
                    ent->pain_debounce_time = level.time + 1;
                }
            }
        }
        else
        {
            if (ent->waterlevel > 0)
            {
                ent->air_finished = level.time + 9;
            }
            else if (ent->air_finished < level.time)
            {   // suffocate!
                if (ent->pain_debounce_time < level.time)
                {
                    dmg = 2 + 2 * floor(level.time - ent->air_finished);
                    if (dmg > 15)
                        dmg = 15;
                    T_Damage (ent, world, world, vec3_origin, ent->s.origin, vec3_origin, dmg, 0, DAMAGE_NO_ARMOR, MOD_WATER);
                    ent->pain_debounce_time = level.time + 1;
                }
            }
        }
    }
    
    if (ent->waterlevel == 0)
    {
        if (ent->flags & FL_INWATER)
        {   
            gi.sound (ent, CHAN_BODY, gi.soundindex("player/watr_out.wav"), 1, ATTN_NORM, 0);
            ent->flags &= ~FL_INWATER;
        }
        return;
    }
 
    if ((ent->watertype & CONTENTS_LAVA) && !(ent->flags & FL_IMMUNE_LAVA))
    {
        if (ent->damage_debounce_time < level.time)
        {
            ent->damage_debounce_time = level.time + 0.2;
            T_Damage (ent, world, world, vec3_origin, ent->s.origin, vec3_origin, 10*ent->waterlevel, 0, 0, MOD_LAVA);
        }
    }
    if ((ent->watertype & CONTENTS_SLIME) && !(ent->flags & FL_IMMUNE_SLIME))
    {
        if (ent->damage_debounce_time < level.time)
        {
            ent->damage_debounce_time = level.time + 1;
            T_Damage (ent, world, world, vec3_origin, ent->s.origin, vec3_origin, 4*ent->waterlevel, 0, 0, MOD_SLIME);
        }
    }
    
    if ( !(ent->flags & FL_INWATER) )
    {   
        if (!(ent->svflags & SVF_DEADMONSTER))
        {
            if (ent->watertype & CONTENTS_LAVA)
                if (random() <= 0.5)
                    gi.sound (ent, CHAN_BODY, gi.soundindex("player/lava1.wav"), 1, ATTN_NORM, 0);
                else
                    gi.sound (ent, CHAN_BODY, gi.soundindex("player/lava2.wav"), 1, ATTN_NORM, 0);
            else if (ent->watertype & CONTENTS_SLIME)
                gi.sound (ent, CHAN_BODY, gi.soundindex("player/watr_in.wav"), 1, ATTN_NORM, 0);
            else if (ent->watertype & CONTENTS_WATER)
                gi.sound (ent, CHAN_BODY, gi.soundindex("player/watr_in.wav"), 1, ATTN_NORM, 0);
        }
 
        ent->flags |= FL_INWATER;
        ent->damage_debounce_time = 0;
    }
}
 
 
void M_droptofloor (edict_t *ent)
{
    vec3_t      end;
    trace_t     trace;
 
    ent->s.origin[2] += 1;
    VectorCopy (ent->s.origin, end);
    end[2] -= 256;
    
    trace = gi.trace (ent->s.origin, ent->mins, ent->maxs, end, ent, MASK_MONSTERSOLID);
 
    if (trace.fraction == 1 || trace.allsolid)
        return;
 
    VectorCopy (trace.endpos, ent->s.origin);
 
    gi.linkentity (ent);
    M_CheckGround (ent);
    M_CatagorizePosition (ent);
}
 
 
void M_SetEffects (edict_t *ent)
{
    ent->s.effects &= ~(EF_COLOR_SHELL|EF_POWERSCREEN);
    ent->s.renderfx &= ~(RF_SHELL_RED|RF_SHELL_GREEN|RF_SHELL_BLUE);
 
    if (ent->monsterinfo.aiflags & AI_RESURRECTING)
    {
        ent->s.effects |= EF_COLOR_SHELL;
        ent->s.renderfx |= RF_SHELL_RED;
    }
 
    if (ent->health <= 0)
        return;
 
    if (ent->powerarmor_time > level.time)
    {
        if (ent->monsterinfo.power_armor_type == POWER_ARMOR_SCREEN)
        {
            ent->s.effects |= EF_POWERSCREEN;
        }
        else if (ent->monsterinfo.power_armor_type == POWER_ARMOR_SHIELD)
        {
            ent->s.effects |= EF_COLOR_SHELL;
            ent->s.renderfx |= RF_SHELL_GREEN;
        }
    }
}
 
 
void M_MoveFrame (edict_t *self)
{
    mmove_t *move;
    int     index;
 
    move = self->monsterinfo.currentmove;
    self->nextthink = level.time + FRAMETIME;
 
    if ((self->monsterinfo.nextframe) && (self->monsterinfo.nextframe >= move->firstframe) && (self->monsterinfo.nextframe <= move->lastframe))
    {
        self->s.frame = self->monsterinfo.nextframe;
        self->monsterinfo.nextframe = 0;
    }
    else
    {
        if (self->s.frame == move->lastframe)
        {
            if (move->endfunc)
            {
                move->endfunc (self);
 
                // regrab move, endfunc is very likely to change it
                move = self->monsterinfo.currentmove;
 
                // check for death
                if (self->svflags & SVF_DEADMONSTER)
                    return;
            }
        }
 
        if (self->s.frame < move->firstframe || self->s.frame > move->lastframe)
        {
            self->monsterinfo.aiflags &= ~AI_HOLD_FRAME;
            self->s.frame = move->firstframe;
        }
        else
        {
            if (!(self->monsterinfo.aiflags & AI_HOLD_FRAME))
            {
                self->s.frame++;
                if (self->s.frame > move->lastframe)
                    self->s.frame = move->firstframe;
            }
        }
    }
 
    index = self->s.frame - move->firstframe;
    if (move->frame[index].aifunc) {
        if (!(self->monsterinfo.aiflags & AI_HOLD_FRAME))
            move->frame[index].aifunc (self, move->frame[index].dist * self->monsterinfo.scale);
        else
            move->frame[index].aifunc (self, 0);
    }
    if (move->frame[index].thinkfunc)
        move->frame[index].thinkfunc (self);
}
 
 
void monster_think (edict_t *self)
{
    M_MoveFrame (self);
    if (self->linkcount != self->monsterinfo.linkcount)
    {
        self->monsterinfo.linkcount = self->linkcount;
        M_CheckGround (self);
    }
    M_CatagorizePosition (self);
    M_WorldEffects (self);
    M_SetEffects (self);
}
 
 
/*
================
monster_use
 
Using a monster makes it angry at the current activator
================
*/
void monster_use (edict_t *self, edict_t *other, edict_t *activator)
{
    if (self->enemy)
        return;
    if (self->health <= 0)
        return;
    if (activator->flags & FL_NOTARGET)
        return;
    if (!(activator->client) && !(activator->monsterinfo.aiflags & AI_GOOD_GUY))
        return;
    
// delay reaction so if the monster is teleported, its sound is still heard
    self->enemy = activator;
    FoundTarget (self);
}
 
 
void monster_start_go (edict_t *self);
 
 
void monster_triggered_spawn (edict_t *self)
{
    self->s.origin[2] += 1;
    KillBox (self);
 
    self->solid = SOLID_BBOX;
    self->movetype = MOVETYPE_STEP;
    self->svflags &= ~SVF_NOCLIENT;
    self->air_finished = level.time + 12;
    gi.linkentity (self);
 
    monster_start_go (self);
 
    if (self->enemy && !(self->spawnflags & 1) && !(self->enemy->flags & FL_NOTARGET))
    {
        FoundTarget (self);
    }
    else
    {
        self->enemy = NULL;
    }
}
 
void monster_triggered_spawn_use (edict_t *self, edict_t *other, edict_t *activator)
{
    // we have a one frame delay here so we don't telefrag the guy who activated us
    self->think = monster_triggered_spawn;
    self->nextthink = level.time + FRAMETIME;
    if (activator->client)
        self->enemy = activator;
    self->use = monster_use;
}
 
void monster_triggered_start (edict_t *self)
{
    self->solid = SOLID_NOT;
    self->movetype = MOVETYPE_NONE;
    self->svflags |= SVF_NOCLIENT;
    self->nextthink = 0;
    self->use = monster_triggered_spawn_use;
}
 
 
/*
================
monster_death_use
 
When a monster dies, it fires all of its targets with the current
enemy as activator.
================
*/
void monster_death_use (edict_t *self)
{
    self->flags &= ~(FL_FLY|FL_SWIM);
    self->monsterinfo.aiflags &= AI_GOOD_GUY;
 
    if (self->item)
    {
        Drop_Item (self, self->item);
        self->item = NULL;
    }
 
    if (self->deathtarget)
        self->target = self->deathtarget;
 
    if (!self->target)
        return;
 
    G_UseTargets (self, self->enemy);
}
 
 
//============================================================================
 
qboolean monster_start (edict_t *self)
{
    if (deathmatch->value)
    {
        G_FreeEdict (self);
        return false;
    }
 
    if ((self->spawnflags & 4) && !(self->monsterinfo.aiflags & AI_GOOD_GUY))
    {
        self->spawnflags &= ~4;
        self->spawnflags |= 1;
//      gi.dprintf("fixed spawnflags on %s at %s\n", self->classname, vtos(self->s.origin));
    }
 
    if (!(self->monsterinfo.aiflags & AI_GOOD_GUY))
        level.total_monsters++;
 
    self->nextthink = level.time + FRAMETIME;
    self->svflags |= SVF_MONSTER;
    self->s.renderfx |= RF_FRAMELERP;
    self->takedamage = DAMAGE_AIM;
    self->air_finished = level.time + 12;
    self->use = monster_use;
    self->max_health = self->health;
    self->clipmask = MASK_MONSTERSOLID;
 
    self->s.skinnum = 0;
    self->deadflag = DEAD_NO;
    self->svflags &= ~SVF_DEADMONSTER;
 
    if (!self->monsterinfo.checkattack)
        self->monsterinfo.checkattack = M_CheckAttack;
    VectorCopy (self->s.origin, self->s.old_origin);
 
    if (st.item)
    {
        self->item = FindItemByClassname (st.item);
        if (!self->item)
            gi.dprintf("%s at %s has bad item: %s\n", self->classname, vtos(self->s.origin), st.item);
    }
 
    // randomize what frame they start on
    if (self->monsterinfo.currentmove)
        self->s.frame = self->monsterinfo.currentmove->firstframe + (rand() % (self->monsterinfo.currentmove->lastframe - self->monsterinfo.currentmove->firstframe + 1));
 
    return true;
}
 
void monster_start_go (edict_t *self)
{
    vec3_t  v;
 
    if (self->health <= 0)
        return;
 
    // check for target to combat_point and change to combattarget
    if (self->target)
    {
        qboolean    notcombat;
        qboolean    fixup;
        edict_t     *target;
 
        target = NULL;
        notcombat = false;
        fixup = false;
        while ((target = G_Find (target, FOFS(targetname), self->target)) != NULL)
        {
            if (strcmp(target->classname, "point_combat") == 0)
            {
                self->combattarget = self->target;
                fixup = true;
            }
            else
            {
                notcombat = true;
            }
        }
        if (notcombat && self->combattarget)
            gi.dprintf("%s at %s has target with mixed types\n", self->classname, vtos(self->s.origin));
        if (fixup)
            self->target = NULL;
    }
 
    // validate combattarget
    if (self->combattarget)
    {
        edict_t     *target;
 
        target = NULL;
        while ((target = G_Find (target, FOFS(targetname), self->combattarget)) != NULL)
        {
            if (strcmp(target->classname, "point_combat") != 0)
            {
                gi.dprintf("%s at (%i %i %i) has a bad combattarget %s : %s at (%i %i %i)\n",
                    self->classname, (int)self->s.origin[0], (int)self->s.origin[1], (int)self->s.origin[2],
                    self->combattarget, target->classname, (int)target->s.origin[0], (int)target->s.origin[1],
                    (int)target->s.origin[2]);
            }
        }
    }
 
    if (self->target)
    {
        self->goalentity = self->movetarget = G_PickTarget(self->target);
        if (!self->movetarget)
        {
            gi.dprintf ("%s can't find target %s at %s\n", self->classname, self->target, vtos(self->s.origin));
            self->target = NULL;
            self->monsterinfo.pausetime = 100000000;
            self->monsterinfo.stand (self);
        }
        else if (strcmp (self->movetarget->classname, "path_corner") == 0)
        {
            VectorSubtract (self->goalentity->s.origin, self->s.origin, v);
            self->ideal_yaw = self->s.angles[YAW] = vectoyaw(v);
            self->monsterinfo.walk (self);
            self->target = NULL;
        }
        else
        {
            self->goalentity = self->movetarget = NULL;
            self->monsterinfo.pausetime = 100000000;
            self->monsterinfo.stand (self);
        }
    }
    else
    {
        self->monsterinfo.pausetime = 100000000;
        self->monsterinfo.stand (self);
    }
 
    self->think = monster_think;
    self->nextthink = level.time + FRAMETIME;
}
 
 
void walkmonster_start_go (edict_t *self)
{
    if (!(self->spawnflags & 2) && level.time < 1)
    {
        M_droptofloor (self);
 
        if (self->groundentity)
            if (!M_walkmove (self, 0, 0))
                gi.dprintf ("%s in solid at %s\n", self->classname, vtos(self->s.origin));
    }
    
    if (!self->yaw_speed)
        self->yaw_speed = 20;
    self->viewheight = 25;
 
    monster_start_go (self);
 
    if (self->spawnflags & 2)
        monster_triggered_start (self);
}
 
void walkmonster_start (edict_t *self)
{
    self->think = walkmonster_start_go;
    monster_start (self);
}
 
 
void flymonster_start_go (edict_t *self)
{
    if (!M_walkmove (self, 0, 0))
        gi.dprintf ("%s in solid at %s\n", self->classname, vtos(self->s.origin));
 
    if (!self->yaw_speed)
        self->yaw_speed = 10;
    self->viewheight = 25;
 
    monster_start_go (self);
 
    if (self->spawnflags & 2)
        monster_triggered_start (self);
}
 
 
void flymonster_start (edict_t *self)
{
    self->flags |= FL_FLY;
    self->think = flymonster_start_go;
    monster_start (self);
}
 
 
void swimmonster_start_go (edict_t *self)
{
    if (!self->yaw_speed)
        self->yaw_speed = 10;
    self->viewheight = 10;
 
    monster_start_go (self);
 
    if (self->spawnflags & 2)
        monster_triggered_start (self);
}
 
void swimmonster_start (edict_t *self)
{
    self->flags |= FL_SWIM;
    self->think = swimmonster_start_go;
    monster_start (self);
}