Set up the subfunction.

src/thingdef/thingdef_codeptr.cpp

@@ -4975,6 +4975,127 @@ enum RadiusGiveFlags
 	RGF_EITHER		=	1 << 17,
 };
 
+static bool DoRadiusGive(AActor *self, AActor *thing, const PClass *item, int amount, fixed_t distance, int flags, const PClass *filter, FName species, fixed_t mindist)
+{
+	//[MC] Check for a filter, species, and the related exfilter/expecies/either flag(s).
+	bool filterpass = DoCheckClass(thing, filter, !!(flags & RGF_EXFILTER)),
+		speciespass = DoCheckSpecies(thing, species, !!(flags & RGF_EXSPECIES));
+
+	if ((flags & RGF_EITHER) ? (!(filterpass || speciespass)) : (!(filterpass && speciespass)))
+	{
+		if (thing != self)	//Don't let filter and species obstruct RGF_GIVESELF.
+			return false;
+	}
+
+	if (thing == self)
+	{
+		if (!(flags & RGF_GIVESELF))
+			return false;
+	}
+
+	//Check for target, master, and tracer flagging.
+	bool targetPass = true;
+	bool masterPass = true;
+	bool tracerPass = true;
+	bool ptrPass = false;
+	if ((thing != self) && (flags & (RGF_NOTARGET | RGF_NOMASTER | RGF_NOTRACER)))
+	{
+		if ((thing == self->target) && (flags & RGF_NOTARGET))
+			targetPass = false;
+		if ((thing == self->master) && (flags & RGF_NOMASTER))
+			masterPass = false;
+		if ((thing == self->tracer) && (flags & RGF_NOTRACER))
+			tracerPass = false;
+
+		ptrPass = (flags & RGF_INCLUSIVE) ? (targetPass || masterPass || tracerPass) : (targetPass && masterPass && tracerPass);
+
+		//We should not care about what the actor is here. It's safe to abort this actor.
+		if (!ptrPass)
+			return false;
+	}
+
+	//Next, actor flag checking. 
+	bool selfPass = !!((flags & RGF_GIVESELF) && thing == self);
+	bool corpsePass = !!((flags & RGF_CORPSES) && thing->flags & MF_CORPSE);
+	bool killedPass = !!((flags & RGF_KILLED) && thing->flags6 & MF6_KILLED);
+	bool monsterPass = !!((flags & RGF_MONSTERS) && thing->flags3 & MF3_ISMONSTER);
+	bool objectPass = !!((flags & RGF_OBJECTS) && (thing->player == NULL) && (!(thing->flags3 & MF3_ISMONSTER))
+		&& ((thing->flags & MF_SHOOTABLE) || (thing->flags6 & MF6_VULNERABLE)));
+	bool playerPass = !!((flags & RGF_PLAYERS) && (thing->player != NULL) && (thing->player->mo == thing));
+	bool voodooPass = !!((flags & RGF_VOODOO) && (thing->player != NULL) && (thing->player->mo != thing));
+	//Self calls priority over the rest of this.
+	if (!selfPass)
+	{
+		//If it's specifically a monster/object/player/voodoo... Can be either or...
+		if (monsterPass || objectPass || playerPass || voodooPass)
+		{
+			//...and is dead, without desire to give to the dead...
+			if (((thing->health <= 0) && !(corpsePass || killedPass)))
+			{
+				//Skip!
+				return false;
+			}
+		}
+	}
+
+	bool itemPass = !!((flags & RGF_ITEMS) && thing->IsKindOf(RUNTIME_CLASS(AInventory)));
+	bool missilePass = !!((flags & RGF_MISSILES) && thing->flags & MF_MISSILE);
+
+	if (selfPass || monsterPass || corpsePass || killedPass || itemPass || objectPass || missilePass || playerPass || voodooPass)
+	{
+
+		fixedvec3 diff = self->Vec3To(thing);
+		diff.z += (thing->height - self->height) / 2;
+		if (flags & RGF_CUBE)
+		{ // check if inside a cube
+			double dx = fabs((double)(diff.x));
+			double dy = fabs((double)(diff.y));
+			double dz = fabs((double)(diff.z));
+			double dist = (double)distance;
+			double min = (double)mindist;
+			if ((dx > dist || dy > dist || dz > dist) || (min && (dx < min && dy < min && dz < min)))
+			{
+				return false;
+			}
+		}
+		else
+		{ // check if inside a sphere
+			double distsquared = double(distance) * double(distance);
+			double minsquared = double(mindist) * double(mindist);
+			double lengthsquared = TVector3<double>(diff.x, diff.y, diff.z).LengthSquared();
+			if (lengthsquared > distsquared || (minsquared && (lengthsquared < minsquared)))
+			{
+				return false;
+			}
+		}
+
+		if ((flags & RGF_NOSIGHT) || P_CheckSight(thing, self, SF_IGNOREVISIBILITY | SF_IGNOREWATERBOUNDARY))
+		{ // OK to give; target is in direct path, or the monster doesn't care about it being in line of sight.
+			AInventory *gift = static_cast<AInventory *>(Spawn(item, 0, 0, 0, NO_REPLACE));
+			if (gift->IsKindOf(RUNTIME_CLASS(AHealth)))
+			{
+				gift->Amount *= amount;
+			}
+			else
+			{
+				gift->Amount = amount;
+			}
+			gift->flags |= MF_DROPPED;
+			gift->ClearCounters();
+			if (!gift->CallTryPickup(thing))
+			{
+				gift->Destroy();
+				return false;
+			}
+			else
+			{
+				return true;
+			}
+		}
+	}
+	return false;
+}
+
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_RadiusGive)
 {
 	ACTION_PARAM_START(7);