First part of Subterranean Gates rework. Fixes #http://bugs.vcmi.eu/view.php?id=2450

lib/rmg/CMapGenerator.cpp

@@ -272,19 +272,20 @@ void CMapGenerator::fillZones()
 
 	//initialize possible tiles before any object is actually placed
 	for (auto it : zones)
-	{
 		it.second->initFreeTiles(this);
-	}
 
 	findZonesForQuestArts();
-	createConnections();
+	createDirectConnections(); //direct
 	//make sure all connections are passable before creating borders
 	for (auto it : zones)
-	{
+		it.second->createBorder(this); //once direct connections are done
-		it.second->createBorder(this);
+
+	createConnections2(); //subterranean gates and monoliths
+
 	//we need info about all town types to evaluate dwellings and pandoras with creatures properly
+	for (auto it : zones)
 		it.second->initTownType(this);
-	}
+
 	std::vector<CRmgTemplateZone*> treasureZones;
 	for (auto it : zones)
 	{
@@ -462,7 +463,7 @@ void CMapGenerator::findZonesForQuestArts()
 	}
 }
 
-void CMapGenerator::createConnections()
+void CMapGenerator::createDirectConnections()
 {
 	for (auto connection : mapGenOptions->getMapTemplate()->getConnections())
 	{
@@ -531,15 +532,38 @@ void CMapGenerator::createConnections()
 				}
 			}
 		}
-		else //create subterranean gates between two zones
+
+		if (!guardPos.valid())
+			connectionsLeft.push_back(connection);
+	}
+}
+
+void CMapGenerator::createConnections2()
+{
+	for (auto & connection : connectionsLeft)
+	{
+		auto zoneA = connection.getZoneA();
+		auto zoneB = connection.getZoneB();
+
+		auto tileSetA = zoneA->getPossibleTiles(),
+			tileSetB = zoneB->getPossibleTiles();
+
+		std::vector<int3> tilesA(tileSetA.begin(), tileSetA.end()),
+			tilesB(tileSetB.begin(), tileSetB.end());
+
+		int3 guardPos(-1, -1, -1);
+
+		int3 posA = zoneA->getPos();
+		int3 posB = zoneB->getPos();
+		auto zoneAid = zoneA->getId();
+		auto zoneBid = zoneB->getId();
+
+		if (posA.z != posB.z) //try to place subterranean gates
 		{
 			//find common tiles for both zones
 
 			std::vector<int3> commonTiles;
-			auto tileSetA = zoneA->getTileInfo(),
+
-				tileSetB = zoneB->getTileInfo();
-			std::vector<int3> tilesA (tileSetA.begin(), tileSetA.end()),
-				tilesB (tileSetB.begin(), tileSetB.end());
 			boost::sort(tilesA),
 				boost::sort(tilesB);
 
@@ -576,21 +600,20 @@ void CMapGenerator::createConnections()
 					{
 						bool withinZone = true;
 
-						foreach_neighbour (tile, [&withinZone, &tiles, zoneAid, this](int3 &pos)
+						foreach_neighbour(tile, [&withinZone, zoneAid, this](int3 &pos)
 						{
 							if (getZoneID(pos) != zoneAid)
 								withinZone = false;
 						});
-						foreach_neighbour (otherTile, [&withinZone, &otherZoneTiles, zoneBid, this](int3 &pos)
+						foreach_neighbour(otherTile, [&withinZone, zoneBid, this](int3 &pos)
 						{
 							if (getZoneID(pos) != zoneBid)
 								withinZone = false;
 						});
-
+						if (withinZone)
+						{
 							//make sure both gates has some free tiles below them
 							if (zoneA->getAccessibleOffset(this, sgt, tile).valid() && zoneB->getAccessibleOffset(this, sgt, otherTile).valid())
-						{
-							if (withinZone)
 							{
 								zoneA->placeSubterraneanGate(this, tile, connection.getGuardStrength());
 								zoneB->placeSubterraneanGate(this, otherTile, connection.getGuardStrength());

lib/rmg/CMapGenerator.h

@@ -16,6 +16,7 @@
 #include "CMapGenOptions.h"
 #include "CRmgTemplateZone.h"
 #include "../int3.h"
+#include "CRmgTemplate.h" //for CRmgTemplateZoneConnection
 
 class CMap;
 class CRmgTemplate;
@@ -63,7 +64,8 @@ public:
 	CMapEditManager * editManager;
 
 	std::map<TRmgTemplateZoneId, CRmgTemplateZone*> getZones() const;
-	void createConnections();
+	void createDirectConnections();
+	void createConnections2();
 	void findZonesForQuestArts();
 	void foreach_neighbour(const int3 &pos, std::function<void(int3& pos)> foo);
 	void foreachDirectNeighbour(const int3 &pos, std::function<void(int3& pos)> foo);
@@ -98,6 +100,7 @@ public:
 	void setZoneID(const int3& tile, TRmgTemplateZoneId zid);
 
 private:
+	std::list<CRmgTemplateZoneConnection> connectionsLeft;
 	std::map<TRmgTemplateZoneId, CRmgTemplateZone*> zones;
 	std::map<TFaction, ui32> zonesPerFaction;
 	ui32 zonesTotal; //zones that have their main town only

lib/rmg/CRmgTemplateZone.cpp

@@ -392,6 +392,10 @@ std::set<int3> CRmgTemplateZone::getTileInfo () const
 {
 	return tileinfo;
 }
+std::set<int3> CRmgTemplateZone::getPossibleTiles() const
+{
+	return possibleTiles;
+}
 
 void CRmgTemplateZone::discardDistantTiles (CMapGenerator* gen, float distance)
 {

lib/rmg/CRmgTemplateZone.h

@@ -23,6 +23,7 @@ class CTileInfo;
 class int3;
 class CGObjectInstance;
 class ObjectTemplate;
+class CRmgTemplateZoneConnection;
 
 namespace ETemplateZoneType
 {
@@ -162,6 +163,7 @@ public:
 	void addTile (const int3 &pos);
 	void initFreeTiles (CMapGenerator* gen);
 	std::set<int3> getTileInfo() const;
+	std::set<int3> getPossibleTiles() const;
 	void discardDistantTiles (CMapGenerator* gen, float distance);
 	void clearTiles();