reaction/reaction/action/g_utils.c

// g_utils.c -- misc utility functions for game module

#include "g_local.h"


void G_ProjectSource (vec3_t point, vec3_t distance, vec3_t forward, vec3_t right, vec3_t result)
{
        result[0] = point[0] + forward[0] * distance[0] + right[0] * distance[1];
        result[1] = point[1] + forward[1] * distance[0] + right[1] * distance[1];
        result[2] = point[2] + forward[2] * distance[0] + right[2] * distance[1] + distance[2];
}


/*
=============
G_Find

Searches all active entities for the next one that holds
the matching string at fieldofs (use the FOFS() macro) in the structure.

Searches beginning at the edict after from, or the beginning if NULL
NULL will be returned if the end of the list is reached.

=============
*/
edict_t *G_Find (edict_t *from, int fieldofs, char *match)
{
        char    *s;

        if (!from)
                from = g_edicts;
        else
                from++;

        for ( ; from < &g_edicts[globals.num_edicts] ; from++)
        {
                if (!from->inuse)
                        continue;
                s = *(char **) ((byte *)from + fieldofs);
                if (!s)
                        continue;
                if (!Q_stricmp (s, match))
                        return from;
        }

        return NULL;
}


/*
=================
findradius

Returns entities that have origins within a spherical area

findradius (origin, radius)
=================
*/
edict_t *findradius (edict_t *from, vec3_t org, float rad)
{
        vec3_t  eorg;
        int             j;

        if (!from)
                from = g_edicts;
        else
                from++;
        for ( ; from < &g_edicts[globals.num_edicts]; from++)
        {
                if (!from->inuse)
                        continue;
                if (from->solid == SOLID_NOT)
                        continue;
                for (j=0 ; j<3 ; j++)
                        eorg[j] = org[j] - (from->s.origin[j] + (from->mins[j] + from->maxs[j])*0.5);
                if (VectorLength(eorg) > rad)
                        continue;
                return from;
        }

        return NULL;
}


/*
=============
G_PickTarget

Searches all active entities for the next one that holds
the matching string at fieldofs (use the FOFS() macro) in the structure.

Searches beginning at the edict after from, or the beginning if NULL
NULL will be returned if the end of the list is reached.

=============
*/
#define MAXCHOICES      8

edict_t *G_PickTarget (char *targetname)
{
        edict_t *ent = NULL;
        int             num_choices = 0;
        edict_t *choice[MAXCHOICES];

        if (!targetname)
        {
                gi.dprintf("G_PickTarget called with NULL targetname\n");
                return NULL;
        }

        while(1)
        {
                ent = G_Find (ent, FOFS(targetname), targetname);
                if (!ent)
                        break;
                choice[num_choices++] = ent;
                if (num_choices == MAXCHOICES)
                        break;
        }

        if (!num_choices)
        {
                gi.dprintf("G_PickTarget: target %s not found\n", targetname);
                return NULL;
        }

        return choice[rand() % num_choices];
}



void Think_Delay (edict_t *ent)
{
        G_UseTargets (ent, ent->activator);
        G_FreeEdict (ent);
}

/*
==============================
G_UseTargets

the global "activator" should be set to the entity that initiated the firing.

If self.delay is set, a DelayedUse entity will be created that will actually
do the SUB_UseTargets after that many seconds have passed.

Centerprints any self.message to the activator.

Search for (string)targetname in all entities that
match (string)self.target and call their .use function

==============================
*/
void G_UseTargets (edict_t *ent, edict_t *activator)
{
        edict_t         *t;

//
// check for a delay
//
        if (ent->delay)
        {
        // create a temp object to fire at a later time
                t = G_Spawn();
                t->classname = "DelayedUse";
                t->nextthink = level.time + ent->delay;
                t->think = Think_Delay;
                t->activator = activator;
                if (!activator)
                        gi.dprintf ("Think_Delay with no activator\n");
                t->message = ent->message;
                t->target = ent->target;
                t->killtarget = ent->killtarget;
                return;
        }
        
        
//
// print the message
//
        if ((ent->message) && !(activator->svflags & SVF_MONSTER))
        {
                gi.centerprintf (activator, "%s", ent->message);
                if (ent->noise_index)
                        gi.sound (activator, CHAN_AUTO, ent->noise_index, 1, ATTN_NORM, 0);
                else
                        gi.sound (activator, CHAN_AUTO, gi.soundindex ("misc/talk1.wav"), 1, ATTN_NORM, 0);
        }

//
// kill killtargets
//
        if (ent->killtarget)
        {
                t = NULL;
                while ((t = G_Find (t, FOFS(targetname), ent->killtarget)))
                {
                        G_FreeEdict (t);
                        if (!ent->inuse)
                        {
                                gi.dprintf("entity was removed while using killtargets\n");
                                return;
                        }
                }
        }

//
// fire targets
//
        if (ent->target)
        {
                t = NULL;
                while ((t = G_Find (t, FOFS(targetname), ent->target)))
                {
                        // doors fire area portals in a specific way
                        if (!Q_stricmp(t->classname, "func_areaportal") &&
                                (!Q_stricmp(ent->classname, "func_door") || !Q_stricmp(ent->classname, "func_door_rotating")))
                                continue;

                        if (t == ent)
                        {
                                gi.dprintf ("WARNING: Entity used itself.\n");
                        }
                        else
                        {
                                if (t->use)
                                        t->use (t, ent, activator);
                        }
                        if (!ent->inuse)
                        {
                                gi.dprintf("entity was removed while using targets\n");
                                return;
                        }
                }
        }
}


/*
=============
TempVector

This is just a convenience function
for making temporary vectors for function calls
=============
*/
float   *tv (float x, float y, float z)
{
        static  int             index;
        static  vec3_t  vecs[8];
        float   *v;

        // use an array so that multiple tempvectors won't collide
        // for a while
        v = vecs[index];
        index = (index + 1)&7;

        v[0] = x;
        v[1] = y;
        v[2] = z;

        return v;
}


/*
=============
VectorToString

This is just a convenience function
for printing vectors
=============
*/
char    *vtos (vec3_t v)
{
        static  int             index;
        static  char    str[8][32];
        char    *s;

        // use an array so that multiple vtos won't collide
        s = str[index];
        index = (index + 1)&7;

        Com_sprintf (s, 32, "(%i %i %i)", (int)v[0], (int)v[1], (int)v[2]);

        return s;
}


vec3_t VEC_UP           = {0, -1, 0};
vec3_t MOVEDIR_UP       = {0, 0, 1};
vec3_t VEC_DOWN         = {0, -2, 0};
vec3_t MOVEDIR_DOWN     = {0, 0, -1};

void G_SetMovedir (vec3_t angles, vec3_t movedir)
{
        if (VectorCompare (angles, VEC_UP))
        {
                VectorCopy (MOVEDIR_UP, movedir);
        }
        else if (VectorCompare (angles, VEC_DOWN))
        {
                VectorCopy (MOVEDIR_DOWN, movedir);
        }
        else
        {
                AngleVectors (angles, movedir, NULL, NULL);
        }

        VectorClear (angles);
}


float vectoyaw (vec3_t vec)
{
        float   yaw;
        
// FIXES HERE FROM 3.20 -FB
        if (/*vec[YAW] == 0 &&*/ vec[PITCH] == 0)
        {
                yaw = 0;
                if (vec[YAW] > 0)
                        yaw = 90;
                        else if (vec[YAW] < 0)
                        yaw = -90;
        }
// ^^^
        else
        {
                yaw = (int) (atan2(vec[YAW], vec[PITCH]) * 180 / M_PI);
                if (yaw < 0)
                        yaw += 360;
        }

        return yaw;
}


void vectoangles (vec3_t value1, vec3_t angles)
{
        float   forward;
        float   yaw, pitch;
        
        if (value1[1] == 0 && value1[0] == 0)
        {
                yaw = 0;
                if (value1[2] > 0)
                        pitch = 90;
                else
                        pitch = 270;
        }
        else
        {
// FIXES HERE FROM 3.20  -FB
                        // zucc changing casts to floats
                if (value1[0])
                        yaw = (float) (atan2(value1[1], value1[0]) * 180 / M_PI);
                        else if (value1[1] > 0)
                        yaw = 90;
                        else
                        yaw = -90;
// ^^^
                if (yaw < 0)
                        yaw += 360;

                forward = sqrt (value1[0]*value1[0] + value1[1]*value1[1]);
                pitch = (float) (atan2(value1[2], forward) * 180 / M_PI);
                if (pitch < 0)
                        pitch += 360;
        }

        angles[PITCH] = -pitch;
        angles[YAW] = yaw;
        angles[ROLL] = 0;
}

char *G_CopyString (char *in)
{
        char    *out;
        
        out = gi.TagMalloc (strlen(in)+1, TAG_LEVEL);
        strcpy (out, in);
        return out;
}


void G_InitEdict (edict_t *e)
{
        e->inuse = true;
        e->classname = "noclass";
        e->gravity = 1.0;
        e->s.number = e - g_edicts;
}

/*
=================
G_Spawn

Either finds a free edict, or allocates a new one.
Try to avoid reusing an entity that was recently freed, because it
can cause the client to think the entity morphed into something else
instead of being removed and recreated, which can cause interpolated
angles and bad trails.
=================
*/
edict_t *G_Spawn (void)
{
        int                     i;
        edict_t         *e;

        e = &g_edicts[(int)maxclients->value+1];
        for ( i=maxclients->value+1 ; i<globals.num_edicts ; i++, e++)
        {
                // the first couple seconds of server time can involve a lot of
                // freeing and allocating, so relax the replacement policy
                if (!e->inuse && ( e->freetime < 2 || level.time - e->freetime > 0.5 ) )
                {
                        G_InitEdict (e);
                        return e;
                }
        }
        
        if (i == game.maxentities)
                gi.error ("ED_Alloc: no free edicts");
                
        globals.num_edicts++;
        G_InitEdict (e);
        return e;
}

/*
=================
G_FreeEdict

arks the edict as free
=================
*/
void G_FreeEdict (edict_t *ed)
{
        gi.unlinkentity (ed);           // unlink from world

        if ((ed - g_edicts) <= (maxclients->value + BODY_QUEUE_SIZE))
        {
//              gi.dprintf("tried to free special edict\n");
                return;
        }

        memset (ed, 0, sizeof(*ed));
        ed->classname = "freed";
        ed->freetime = level.time;
        ed->inuse = false;
}


/*
============
G_TouchTriggers

============
*/
void    G_TouchTriggers (edict_t *ent)
{
        int                     i, num;
        edict_t         *touch[MAX_EDICTS], *hit;

        // dead things don't activate triggers!
        if ((ent->client || (ent->svflags & SVF_MONSTER)) && (ent->health <= 0))
                return;

        num = gi.BoxEdicts (ent->absmin, ent->absmax, touch
                , MAX_EDICTS, AREA_TRIGGERS);

        // be careful, it is possible to have an entity in this
        // list removed before we get to it (killtriggered)
        for (i=0 ; i<num ; i++)
        {
                hit = touch[i];
                if (!hit->inuse)
                        continue;
                if (!hit->touch)
                        continue;
                hit->touch (hit, ent, NULL, NULL);
        }
}

/*
============
G_TouchSolids

Call after linking a new trigger in during gameplay
to force all entities it covers to immediately touch it
============
*/
void    G_TouchSolids (edict_t *ent)
{
        int                     i, num;
        edict_t         *touch[MAX_EDICTS], *hit;

        num = gi.BoxEdicts (ent->absmin, ent->absmax, touch
                , MAX_EDICTS, AREA_SOLID);

        // be careful, it is possible to have an entity in this
        // list removed before we get to it (killtriggered)
        for (i=0 ; i<num ; i++)
        {
                hit = touch[i];
                if (!hit->inuse)
                        continue;
                if (ent->touch)
                        ent->touch (hit, ent, NULL, NULL);
                if (!ent->inuse)
                        break;
        }
}




/*
==============================================================================

Kill box

==============================================================================
*/

/*
=================
KillBox

Kills all entities that would touch the proposed new positioning
of ent.  Ent should be unlinked before calling this!
=================
*/
qboolean KillBox (edict_t *ent)
{
        trace_t         tr;

        while (1)
        {
                tr = gi.trace (ent->s.origin, ent->mins, ent->maxs, ent->s.origin, NULL, MASK_PLAYERSOLID);
                if (!tr.ent)
                        break;

                // nail it
                T_Damage (tr.ent, ent, ent, vec3_origin, ent->s.origin, vec3_origin, 100000, 0, DAMAGE_NO_PROTECTION, MOD_TELEFRAG);

                // if we didn't kill it, fail
                if (tr.ent->solid)
                        return false;
        }

        return true;            // all clear
}