Add CanRaiseActor ACS function.

src/p_acs.cpp

@@ -4369,6 +4369,7 @@ enum EACSFunctions
 	ACSF_GetArmorInfo,
 	ACSF_DropInventory,
 	ACSF_PickActor,
+	ACSF_CanRaiseActor,
 
 	/* Zandronum's - these must be skipped when we reach 99!
 	-100:ResetMap(0),
@@ -5626,6 +5627,26 @@ doplaysound:			if (funcIndex == ACSF_PlayActorSound)
 			}
 			break;
 
+		case ACSF_CanRaiseActor:
+			if (argCount >= 1) {
+				if (args[0] == 0) {
+					actor = SingleActorFromTID(args[0], activator);
+					if (actor != NULL) {
+						return P_Thing_CanRaise(actor);
+					}
+				}
+
+				FActorIterator iterator(args[0]);
+				bool canraiseall = false;
+				while ((actor = iterator.Next()))
+				{
+					canraiseall = !P_Thing_CanRaise(actor) | canraiseall;
+				}
+				
+				return !canraiseall;
+			}
+			break;
+
 		default:
 			break;
 	}

src/p_local.h

@@ -171,6 +171,7 @@ int		P_Thing_Damage (int tid, AActor *whofor0, int amount, FName type);
 void	P_Thing_SetVelocity(AActor *actor, fixed_t vx, fixed_t vy, fixed_t vz, bool add, bool setbob);
 void P_RemoveThing(AActor * actor);
 bool P_Thing_Raise(AActor *thing);
+bool P_Thing_CanRaise(AActor *thing);
 const PClass *P_GetSpawnableType(int spawnnum);
 
 //

src/p_things.cpp

@@ -445,6 +445,40 @@ bool P_Thing_Raise(AActor *thing)
 	return true;
 }
 
+bool P_Thing_CanRaise(AActor *thing)
+{
+	FState * RaiseState = thing->GetRaiseState();
+	if (RaiseState == NULL)
+	{
+		return false;
+	}
+	
+	AActor *info = thing->GetDefault();
+
+	// Check against real height and radius
+	int oldflags = thing->flags;
+	fixed_t oldheight = thing->height;
+	fixed_t oldradius = thing->radius;
+
+	thing->flags |= MF_SOLID;
+	thing->height = info->height;
+	thing->radius = info->radius;
+
+	bool check = P_CheckPosition (thing, thing->x, thing->y);
+
+	// Restore checked properties
+	thing->flags = oldflags;
+	thing->radius = oldradius;
+	thing->height = oldheight;
+
+	if (!check)
+	{
+		return false;
+	}
+
+	return true;
+}
+
 void P_Thing_SetVelocity(AActor *actor, fixed_t vx, fixed_t vy, fixed_t vz, bool add, bool setbob)
 {
 	if (actor != NULL)