impulse.qc

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#include "impulse.qh"
// targeted (directional) mode
void trigger_impulse_touch_directional(entity this, entity toucher)
{
    entity targ;
    float pushdeltatime;
    float str;

    if (this.active != ACTIVE_ACTIVE)
        return;

    if (!isPushable(toucher))
        return;

    EXACTTRIGGER_TOUCH(this, toucher);

    targ = find(NULL, targetname, this.target);
    if(!targ)
    {
        objerror(this, "trigger_force without a (valid) .target!\n");
        delete(this);
        return;
    }

    // falloff is not supported because radius is always 0 in directional mode
    str = this.strength;

    pushdeltatime = time - toucher.lastpushtime;
    if (pushdeltatime > IMPULSE_MAX_PUSHDELTATIME)
    {
        pushdeltatime = 0;
    }
    toucher.lastpushtime = time;
    if(!pushdeltatime)
    {
        return;
    }

    if(this.spawnflags & IMPULSE_DIRECTIONAL_SPEEDTARGET)
    {
        float addspeed = str - toucher.velocity * normalize(targ.origin - this.origin);
        if (addspeed > 0)
        {
            float accelspeed = min(IMPULSE_DIRECTIONAL_MAX_ACCEL_FACTOR * pushdeltatime * str, addspeed);
            toucher.velocity += accelspeed * normalize(targ.origin - this.origin);
        }
    }
    else
        toucher.velocity = toucher.velocity + normalize(targ.origin - this.origin) * str * pushdeltatime;

    UNSET_ONGROUND(toucher);

#ifdef SVQC
    UpdateCSQCProjectile(toucher);
#endif
}

// Directionless (accelerator/decelerator) mode
void trigger_impulse_touch_accel(entity this, entity toucher)
{
    float pushdeltatime;

    if (this.active != ACTIVE_ACTIVE)
        return;

    if (!isPushable(toucher))
        return;

    EXACTTRIGGER_TOUCH(this, toucher);

    pushdeltatime = time - toucher.lastpushtime;
    if (pushdeltatime > IMPULSE_MAX_PUSHDELTATIME)
    {
        pushdeltatime = 0;
    }
    toucher.lastpushtime = time;
    if(!pushdeltatime)
    {
        return;
    }

    // div0: ticrate independent, 1 = identity (not 20)
    toucher.velocity = toucher.velocity * (this.strength ** pushdeltatime);

#ifdef SVQC
    UpdateCSQCProjectile(toucher);
#endif
}

// Spherical (gravity/repulsor) mode
void trigger_impulse_touch_radial(entity this, entity toucher)
{
    float pushdeltatime;
    float str;

    if (this.active != ACTIVE_ACTIVE)
        return;

    if (!isPushable(toucher))
        return;

    EXACTTRIGGER_TOUCH(this, toucher);

    pushdeltatime = time - toucher.lastpushtime;
    if (pushdeltatime > IMPULSE_MAX_PUSHDELTATIME)
    {
        pushdeltatime = 0;
    }
    toucher.lastpushtime = time;
    if(!pushdeltatime)
    {
        return;
    }

    setsize(this, '-1 -1 -1' * this.radius,'1 1 1' * this.radius);

    str = min(this.radius, vlen(this.origin - toucher.origin));

    if(this.falloff == FALLOFF_LINEAR)
        str = (1 - str / this.radius) * this.strength; // 1 in the inside
    else if(this.falloff == FALLOFF_LINEAR_INV)
        str = (str / this.radius) * this.strength; // 0 in the inside
    else
        str = this.strength;

    toucher.velocity = toucher.velocity + normalize(toucher.origin - this.origin) * str * pushdeltatime;

#ifdef SVQC
    UpdateCSQCProjectile(toucher);
#endif
}

REGISTER_NET_LINKED(ENT_CLIENT_TRIGGER_IMPULSE)

/*QUAKED spawnfunc_trigger_impulse (.5 .5 .5) ?
Force field
-------- KEYS --------
target : If this is set, this points to the spawnfunc_target_position to which the player will get pushed.
         If not, this trigger acts like a damper/accelerator field.

strength : This is how much force to add in the direction of .target each second
           when .target is set. If not, this is how much to slow down/accelerate
           something cought inside this trigger. (1=no change, 0,5 half speed rougthly each tic, 2 = doubble)

radius   : If set, act as a spherical device rather then a linear one.

falloff : 0 = none, 1 = liniar, 2 = inverted liniar

-------- NOTES --------
Use a brush textured with common/origin in the trigger entity to determine the origin of the force
in directional and sperical mode. For damper/accelerator mode this is not nessesary (and has no effect).
*/
#ifdef SVQC
bool trigger_impulse_send(entity this, entity to, int sf)
{
    WriteHeader(MSG_ENTITY, ENT_CLIENT_TRIGGER_IMPULSE);

    WriteByte(MSG_ENTITY, this.spawnflags);
    WriteCoord(MSG_ENTITY, this.radius);
    WriteCoord(MSG_ENTITY, this.strength);
    WriteByte(MSG_ENTITY, this.falloff);
    WriteByte(MSG_ENTITY, this.active);

    trigger_common_write(this, true);

    return true;
}

void trigger_impulse_link(entity this)
{
    trigger_link(this, trigger_impulse_send);
}

spawnfunc(trigger_impulse)
{
    this.active = ACTIVE_ACTIVE;

    trigger_init(this);

    if(this.radius)
    {
        if(!this.strength)
        {
            this.strength = IMPULSE_DEFAULT_RADIAL_STRENGTH * autocvar_g_triggerimpulse_radial_multiplier;
        }
        setorigin(this, this.origin);
        setsize(this, '-1 -1 -1' * this.radius,'1 1 1' * this.radius);
        settouch(this, trigger_impulse_touch_radial);
    }
    else
    {
        if(this.target)
        {
            if(!this.strength)
            {
                this.strength = IMPULSE_DEFAULT_DIRECTIONAL_STRENGTH * autocvar_g_triggerimpulse_directional_multiplier;
            }
            settouch(this, trigger_impulse_touch_directional);
        }
        else
        {
            if(!this.strength)
            {
                this.strength = IMPULSE_DEFAULT_ACCEL_STRENGTH;
            }
            this.strength = (this.strength ** autocvar_g_triggerimpulse_accel_power) * autocvar_g_triggerimpulse_accel_multiplier;
            settouch(this, trigger_impulse_touch_accel);
        }
    }

    trigger_impulse_link(this);
}
#elif defined(CSQC)
NET_HANDLE(ENT_CLIENT_TRIGGER_IMPULSE, bool isnew)
{
    this.spawnflags = ReadByte();
    this.radius = ReadCoord();
    this.strength = ReadCoord();
    this.falloff = ReadByte();
    this.active = ReadByte();

    trigger_common_read(this, true);
    return = true;

    this.solid = SOLID_TRIGGER;
    this.entremove = trigger_remove_generic;
    this.move_time = time;

    if (this.radius)
    {
        settouch(this, trigger_impulse_touch_radial);
    }
    else if (this.target)
    {
        settouch(this, trigger_impulse_touch_directional);
    }
    else
    {
        settouch(this, trigger_impulse_touch_accel);
    }
}
#endif