- added polyobject serializer.

- added sanity checks to prevent a savegame from being loaded with an incompatible map
- refactored a few things to simplify serialization.
- started work on main level serializer function.

src/zzz_old.cpp

@@ -599,3 +599,45 @@ void P_SerializeACSScriptNumber(FArchive &arc, int &scriptnum, bool was2byte)
 	}
 }
 
+//============================================================================
+//
+// Save a line portal for savegames.
+//
+//============================================================================
+
+FArchive &operator<< (FArchive &arc, FLinePortal &port)
+{
+	arc << port.mOrigin
+		<< port.mDestination
+		<< port.mDisplacement
+		<< port.mType
+		<< port.mFlags
+		<< port.mDefFlags
+		<< port.mAlign;
+	return arc;
+}
+
+//============================================================================
+//
+// Save a sector portal for savegames.
+//
+//============================================================================
+
+FArchive &operator<< (FArchive &arc, FSectorPortal &port)
+{
+	arc << port.mType
+		<< port.mFlags
+		<< port.mPartner
+		<< port.mPlane
+		<< port.mOrigin
+		<< port.mDestination
+		<< port.mDisplacement
+		<< port.mPlaneZ;
+	if (arc.IsLoading())
+	{
+		port.mSkybox = nullptr;
+	}
+	return arc;
+}
+
+