cleanup mappack integration

git-svn-id: svn://svn.code.sf.net/p/actiongame/code/trunk/ac@4248 e016b1c5-ed68-44aa-a2f7-31cac88cffde

source/src/worldio.cpp

@@ -424,6 +424,8 @@ bool load_world(char *mname)        // still supports all map formats that have
     execfile("config/default_map_settings.cfg");
     execfile(pcfname);
     execfile(mcfname);
+    const char *pack = getalias("required_mappack");
+    int reqpack = pack ? atoi(pack) : 0;
     persistidents = true;
     popscontext();
 
@@ -437,6 +439,9 @@ bool load_world(char *mname)        // still supports all map formats that have
 
     startmap(mname);
 
+    pack = getalias("mappack_version");
+    if(pack && atoi(pack) < reqpack) conoutf("\f3this map needs mappack version %d or newer", reqpack);
+
     return true;
 }