- changed handling of DF_NO_COOP_WEAPON_SPAWN dmflag so that weapons are not determined by class type but by a newly added flag WEAPONSPAWN, to allow CustomInventory replacements to act like weapons when being spawned.

src/actor.h

@@ -340,6 +340,7 @@ enum
 	MF7_NOTELESTOMP		= 0x00000002,	// cannot telefrag under any circumstances (even when set by MAPINFO)
 	MF7_ALWAYSTELEFRAG	= 0x00000004,	// will unconditionally be telefragged when in the way. Overrides all other settings.
 	MF7_HANDLENODELAY	= 0x00000008,	// respect NoDelay state flag
+	MF7_WEAPONSPAWN		= 0x00000010,	// subject to DF_NO_COOP_WEAPON_SPAWN dmflag
 
 // --- mobj.renderflags ---
 

src/p_mobj.cpp

@@ -4724,7 +4724,7 @@ AActor *P_SpawnMapThing (FMapThing *mthing, int position)
 	// [RH] don't spawn extra weapons in coop if so desired
 	if (multiplayer && !deathmatch && (dmflags & DF_NO_COOP_WEAPON_SPAWN))
 	{
-		if (i->IsDescendantOf (RUNTIME_CLASS(AWeapon)))
+		if (GetDefaultByType(i)->flags7 & MF7_WEAPONSPAWN)
 		{
 			if ((mthing->flags & (MTF_DEATHMATCH|MTF_SINGLE)) == MTF_DEATHMATCH)
 				return NULL;

src/thingdef/thingdef_data.cpp

@@ -240,6 +240,7 @@ static FFlagDef ActorFlags[]=
 	DEFINE_FLAG(MF7, NEVERTARGET, AActor, flags7),
 	DEFINE_FLAG(MF7, NOTELESTOMP, AActor, flags7),
 	DEFINE_FLAG(MF7, ALWAYSTELEFRAG, AActor, flags7),
+	DEFINE_FLAG(MF7, WEAPONSPAWN, AActor, flags7),
 
 	// Effect flags
 	DEFINE_FLAG(FX, VISIBILITYPULSE, AActor, effects),

wadsrc/static/actors/shared/inventory.txt

@@ -335,6 +335,7 @@ Actor Weapon : Inventory native
 	Weapon.BobSpeed 1.0
 	Weapon.BobRangeX 1.0
 	Weapon.BobRangeY 1.0
+	+WEAPONSPAWN
 	States
 	{
 	LightDone:
@@ -362,4 +363,7 @@ Actor WeaponHolder : Inventory native
 	+INVENTORY.UNDROPPABLE
 }
 
-Actor WeaponPiece : Inventory native {}
+Actor WeaponPiece : Inventory native 
+{
+	+WEAPONSPAWN
+}