feat(Core/Config): Add parameter to load all grids of all non-instanced maps on server start (#2283)

src/server/game/Maps/Map.cpp

@@ -469,6 +469,13 @@ void Map::LoadGrid(float x, float y)
     EnsureGridLoaded(Cell(x, y));
 }
 
+void Map::LoadAllCells()
+{
+    for (uint32 cellX = 0; cellX < TOTAL_NUMBER_OF_CELLS_PER_MAP; cellX++)
+        for (uint32 cellY = 0; cellY < TOTAL_NUMBER_OF_CELLS_PER_MAP; cellY++)
+            LoadGrid((cellX + 0.5f - CENTER_GRID_CELL_ID) * SIZE_OF_GRID_CELL, (cellY + 0.5f - CENTER_GRID_CELL_ID) * SIZE_OF_GRID_CELL);
+}
+
 bool Map::AddPlayerToMap(Player* player)
 { 
     CellCoord cellCoord = Trinity::ComputeCellCoord(player->GetPositionX(), player->GetPositionY());

src/server/game/Maps/Map.h

@@ -319,6 +319,7 @@ class Map : public GridRefManager<NGridType>
         }
 
         void LoadGrid(float x, float y);
+        void LoadAllCells();
         bool UnloadGrid(NGridType& ngrid);
         virtual void UnloadAll();
 

src/server/game/World/World.cpp

@@ -1326,6 +1326,9 @@ void World::LoadConfigSettings(bool reload)
     // Prevent players AFK from being logged out
     m_int_configs[CONFIG_AFK_PREVENT_LOGOUT] = sConfigMgr->GetIntDefault("PreventAFKLogout", 0);
 
+    // Preload all grids of all non-instanced maps
+    m_bool_configs[CONFIG_PRELOAD_ALL_NON_INSTANCED_MAP_GRIDS] = sConfigMgr->GetIntDefault("PreloadAllNonInstancedMapGrids", false);
+
     // call ScriptMgr if we're reloading the configuration
     sScriptMgr->OnAfterConfigLoad(reload);
 }
@@ -1958,6 +1961,27 @@ void World::SetInitialWorldSettings()
     sEluna->RunScripts();
     sEluna->OnConfigLoad(false,false); // Must be done after Eluna is initialized and scripts have run.
 #endif
+
+    if (sWorld->getBoolConfig(CONFIG_PRELOAD_ALL_NON_INSTANCED_MAP_GRIDS))
+    {
+        sLog->outString("Loading all grids for all non-instanced maps...");
+
+        for (uint32 i = 0; i < sMapStore.GetNumRows(); ++i)
+        {
+            MapEntry const* mapEntry = sMapStore.LookupEntry(i);
+
+            if (mapEntry && !mapEntry->Instanceable())
+            {
+                Map* map = sMapMgr->CreateBaseMap(mapEntry->MapID);
+
+                if (map)
+                {
+                    sLog->outString(">> Loading all grids for map %u", map->GetId());
+                    map->LoadAllCells();
+                }
+            }
+        }
+    }
     
     uint32 startupDuration = GetMSTimeDiffToNow(startupBegin);
     sLog->outString();

src/server/game/World/World.h

@@ -169,6 +169,7 @@ enum WorldBoolConfigs
     CONFIG_CHECK_GOBJECT_LOS,
     CONFIG_CLOSE_IDLE_CONNECTIONS,
     CONFIG_LFG_LOCATION_ALL, // Player can join LFG anywhere
+    CONFIG_PRELOAD_ALL_NON_INSTANCED_MAP_GRIDS,
     BOOL_CONFIG_VALUE_COUNT
 };