gravity.qc

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#include "gravity.qh"
#ifdef SVQC
.entity trigger_gravity_check;
void trigger_gravity_remove(entity own)
{
    if(own.trigger_gravity_check.owner == own)
    {
        UpdateCSQCProjectile(own);
        own.gravity = own.trigger_gravity_check.gravity;
        delete(own.trigger_gravity_check);
    }
    else
        backtrace("Removing a trigger_gravity_check with no valid owner");
    own.trigger_gravity_check = NULL;
}
void trigger_gravity_check_think(entity this)
{
    // This spawns when a player enters the gravity zone and checks if he left.
    // Each frame, this.count is set to 2 by trigger_gravity_touch() and decreased by 1 here.
    // It the player has left the gravity trigger, this will be allowed to reach 0 and indicate that.
    if(this.count <= 0)
    {
        if(this.owner.trigger_gravity_check == this)
            trigger_gravity_remove(this.owner);
        else
            delete(this);
        return;
    }
    else
    {
        this.count -= 1;
        this.nextthink = time;
    }
}

// legacy
void trigger_gravity_use(entity this, entity actor, entity trigger)
{
    this.setactive(this, ACTIVE_TOGGLE);
}

void trigger_gravity_touch(entity this, entity toucher)
{
    float g;

    if(this.active == ACTIVE_NOT)
        return;

    EXACTTRIGGER_TOUCH(this, toucher);

    g = this.gravity;

    if (!(this.spawnflags & GRAVITY_STICKY))
    {
        if(toucher.trigger_gravity_check)
        {
            if(this == toucher.trigger_gravity_check.enemy)
            {
                // same?
                // NOTE: see explanation in trigger_gravity_check_think
                toucher.trigger_gravity_check.count = 2; // gravity one more frame...
                return;
            }

            // compare prio
            if(this.cnt > toucher.trigger_gravity_check.enemy.cnt)
                trigger_gravity_remove(toucher);
            else
                return;
        }
        toucher.trigger_gravity_check = new_pure(trigger_gravity_checker);
        toucher.trigger_gravity_check.enemy = this;
        toucher.trigger_gravity_check.owner = toucher;
        toucher.trigger_gravity_check.gravity = toucher.gravity;
        setthink(toucher.trigger_gravity_check, trigger_gravity_check_think);
        toucher.trigger_gravity_check.nextthink = time;
        toucher.trigger_gravity_check.count = 2;
        if(toucher.gravity)
            g *= toucher.gravity;
    }

    if (toucher.gravity != g)
    {
        toucher.gravity = g;
        if(this.noise != "")
            _sound (toucher, CH_TRIGGER, this.noise, VOL_BASE, ATTEN_NORM);
        UpdateCSQCProjectile(this.owner);
    }
}

spawnfunc(trigger_gravity)
{
    if(this.gravity == 1)
        return;

    EXACTTRIGGER_INIT;
    settouch(this, trigger_gravity_touch);
    if(this.noise != "")
        precache_sound(this.noise);

    this.active = ACTIVE_ACTIVE;
    this.setactive = generic_setactive;
    if(this.targetname && this.targetname != "")
    {
        // legacy use
        this.use = trigger_gravity_use;
        if(this.spawnflags & GRAVITY_START_DISABLED)
            this.active = ACTIVE_NOT;
    }
}
#endif