sv_physical_items.qc

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#include "sv_physical_items.qh"

int autocvar_g_physical_items;
float autocvar_g_physical_items_damageforcescale;
float autocvar_g_physical_items_reset;

REGISTER_MUTATOR(physical_items, autocvar_g_physical_items)
{
    // check if we have a physics engine
    MUTATOR_ONADD
    {
        if (!(autocvar_physics_ode && checkextension("DP_PHYSICS_ODE")))
        {
            LOG_TRACE("Warning: Physical items are enabled but no physics engine can be used. Reverting to old items.");
            return -1;
        }
    }

    MUTATOR_ONROLLBACK_OR_REMOVE
    {
        // nothing to roll back
    }

    MUTATOR_ONREMOVE
    {
        LOG_INFO("This cannot be removed at runtime");
        return -1;
    }

    return 0;
}

.vector spawn_origin, spawn_angles;

void physical_item_think(entity this)
{
    this.nextthink = time;

    this.alpha = this.owner.alpha; // apply fading and ghosting

    if(!this.cnt) // map item, not dropped
    {
        // copy ghost item properties
        this.colormap = this.owner.colormap;
        this.colormod = this.owner.colormod;
        this.glowmod = this.owner.glowmod;

        // if the item is not spawned, make sure the invisible / ghost item returns to its origin and stays there
        if(autocvar_g_physical_items_reset)
        {
            if(this.owner.wait > time) // awaiting respawn
            {
                setorigin(this, this.spawn_origin);
                this.angles = this.spawn_angles;
                this.solid = SOLID_NOT;
                this.alpha = -1;
                set_movetype(this, MOVETYPE_NONE);
            }
            else
            {
                this.alpha = 1;
                this.solid = SOLID_CORPSE;
                set_movetype(this, MOVETYPE_PHYSICS);
            }
        }
    }

    if(!this.owner.modelindex)
        delete(this); // the real item is gone, remove this
}

void physical_item_touch(entity this, entity toucher)
{
    if(!this.cnt) // not for dropped items
    if (ITEM_TOUCH_NEEDKILL())
    {
        setorigin(this, this.spawn_origin);
        this.angles = this.spawn_angles;
    }
}

void physical_item_damage(entity this, entity inflictor, entity attacker, float damage, int deathtype, .entity weaponentity, vector hitloc, vector force)
{
    if(!this.cnt) // not for dropped items
    if(ITEM_DAMAGE_NEEDKILL(deathtype))
    {
        setorigin(this, this.spawn_origin);
        this.angles = this.spawn_angles;
    }
}

MUTATOR_HOOKFUNCTION(physical_items, Item_Spawn)
{
    entity item = M_ARGV(0, entity);

    if(item.owner == NULL && autocvar_g_physical_items <= 1)
        return;
    if (item.spawnflags & 1) // floating item
        return;

    // The actual item can't be physical and trigger at the same time, so make it invisible and use a second entity for physics.
    // Ugly hack, but unless SOLID_TRIGGER is gotten to work with MOVETYPE_PHYSICS in the engine it can't be fixed.
    entity wep = spawn();
    _setmodel(wep, item.model);
    setsize(wep, item.mins, item.maxs);
    setorigin(wep, item.origin);
    wep.angles = item.angles;
    wep.velocity = item.velocity;

    wep.owner = item;
    wep.solid = SOLID_CORPSE;
    set_movetype(wep, MOVETYPE_PHYSICS);
    wep.takedamage = DAMAGE_AIM;
    wep.effects |= EF_NOMODELFLAGS; // disable the spinning
    wep.colormap = item.owner.colormap;
    wep.glowmod = item.owner.glowmod;
    wep.damageforcescale = autocvar_g_physical_items_damageforcescale;
    wep.dphitcontentsmask = item.dphitcontentsmask;
    wep.cnt = (item.owner != NULL);

    setthink(wep, physical_item_think);
    wep.nextthink = time;
    settouch(wep, physical_item_touch);
    wep.event_damage = physical_item_damage;

    if(!wep.cnt)
    {
        // fix the spawn origin
        setorigin(wep, wep.origin + '0 0 1');
        droptofloor(wep);
    }

    wep.spawn_origin = wep.origin;
    wep.spawn_angles = item.angles;

    item.effects |= EF_NODRAW; // hide the original weapon
    set_movetype(item, MOVETYPE_FOLLOW);
    item.aiment = wep; // attach the original weapon
    setSendEntity(item, func_null);
}