From 5db883fbe9b8ef6171bfafc145a80932c3920504 Mon Sep 17 00:00:00 2001
From: Peter Nelson <peter1138@openttd.org>
Date: Sun, 22 Jul 2018 23:47:15 +0100
Subject: Change: Move rail type bits from m3 to m8.

---
 src/bridge_map.h           |  3 ++-
 src/rail_map.h             | 10 ++++++----
 src/road_map.h             |  3 ++-
 src/saveload/afterload.cpp | 32 ++++++++++++++++++++++++++++++++
 src/saveload/saveload.cpp  |  3 ++-
 src/tunnel_map.h           |  4 +++-
 6 files changed, 47 insertions(+), 8 deletions(-)

(limited to 'src')

diff --git a/src/bridge_map.h b/src/bridge_map.h
index 74c6974db..75b20498d 100644
--- a/src/bridge_map.h
+++ b/src/bridge_map.h
@@ -131,11 +131,12 @@ static inline void MakeBridgeRamp(TileIndex t, Owner o, BridgeType bridgetype, D
 	SetTileType(t, MP_TUNNELBRIDGE);
 	SetTileOwner(t, o);
 	_m[t].m2 = 0;
-	_m[t].m3 = rt;
+	_m[t].m3 = 0;
 	_m[t].m4 = 0;
 	_m[t].m5 = 1 << 7 | tt << 2 | d;
 	SB(_me[t].m6, 2, 4, bridgetype);
 	_me[t].m7 = 0;
+	_me[t].m8 = rt;
 }
 
 /**
diff --git a/src/rail_map.h b/src/rail_map.h
index 2431a7920..bd580d32a 100644
--- a/src/rail_map.h
+++ b/src/rail_map.h
@@ -115,7 +115,7 @@ static inline bool IsRailDepotTile(TileIndex t)
  */
 static inline RailType GetRailType(TileIndex t)
 {
-	return (RailType)GB(_m[t].m3, 0, 4);
+	return (RailType)GB(_me[t].m8, 0, 4);
 }
 
 /**
@@ -125,7 +125,7 @@ static inline RailType GetRailType(TileIndex t)
  */
 static inline void SetRailType(TileIndex t, RailType r)
 {
-	SB(_m[t].m3, 0, 4, r);
+	SB(_me[t].m8, 0, 4, r);
 }
 
 
@@ -522,11 +522,12 @@ static inline void MakeRailNormal(TileIndex t, Owner o, TrackBits b, RailType r)
 	SetTileType(t, MP_RAILWAY);
 	SetTileOwner(t, o);
 	_m[t].m2 = 0;
-	_m[t].m3 = r;
+	_m[t].m3 = 0;
 	_m[t].m4 = 0;
 	_m[t].m5 = RAIL_TILE_NORMAL << 6 | b;
 	SB(_me[t].m6, 2, 4, 0);
 	_me[t].m7 = 0;
+	_me[t].m8 = r;
 }
 
 
@@ -535,11 +536,12 @@ static inline void MakeRailDepot(TileIndex t, Owner o, DepotID did, DiagDirectio
 	SetTileType(t, MP_RAILWAY);
 	SetTileOwner(t, o);
 	_m[t].m2 = did;
-	_m[t].m3 = r;
+	_m[t].m3 = 0;
 	_m[t].m4 = 0;
 	_m[t].m5 = RAIL_TILE_DEPOT << 6 | d;
 	SB(_me[t].m6, 2, 4, 0);
 	_me[t].m7 = 0;
+	_me[t].m8 = r;
 }
 
 #endif /* RAIL_MAP_H */
diff --git a/src/road_map.h b/src/road_map.h
index 693730294..5b3e6b090 100644
--- a/src/road_map.h
+++ b/src/road_map.h
@@ -579,11 +579,12 @@ static inline void MakeRoadCrossing(TileIndex t, Owner road, Owner tram, Owner r
 	SetTileType(t, MP_ROAD);
 	SetTileOwner(t, rail);
 	_m[t].m2 = town;
-	_m[t].m3 = rat;
+	_m[t].m3 = 0;
 	_m[t].m4 = 0;
 	_m[t].m5 = ROAD_TILE_CROSSING << 6 | roaddir;
 	SB(_me[t].m6, 2, 4, 0);
 	_me[t].m7 = rot << 6 | road;
+	_me[t].m8 = rat;
 	SetRoadOwner(t, ROADTYPE_TRAM, tram);
 }
 
diff --git a/src/saveload/afterload.cpp b/src/saveload/afterload.cpp
index 33c49fb61..cca9ad328 100644
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -1214,6 +1214,38 @@ bool AfterLoadGame()
 		}
 	}
 
+	/* Railtype moved from m3 to m8 in version 200. */
+	if (IsSavegameVersionBefore(200)) {
+		for (TileIndex t = 0; t < map_size; t++) {
+			switch (GetTileType(t)) {
+				case MP_RAILWAY:
+					SetRailType(t, (RailType)GB(_m[t].m3, 0, 4));
+					break;
+
+				case MP_ROAD:
+					if (IsLevelCrossing(t)) {
+						SetRailType(t, (RailType)GB(_m[t].m3, 0, 4));
+					}
+					break;
+
+				case MP_STATION:
+					if (HasStationRail(t)) {
+						SetRailType(t, (RailType)GB(_m[t].m3, 0, 4));
+					}
+					break;
+
+				case MP_TUNNELBRIDGE:
+					if (GetTunnelBridgeTransportType(t) == TRANSPORT_RAIL) {
+						SetRailType(t, (RailType)GB(_m[t].m3, 0, 4));
+					}
+					break;
+
+				default:
+					break;
+			}
+		}
+	}
+
 	/* Elrails got added in rev 24 */
 	if (IsSavegameVersionBefore(24)) {
 		RailType min_rail = RAILTYPE_ELECTRIC;
diff --git a/src/saveload/saveload.cpp b/src/saveload/saveload.cpp
index 692f73cf2..d02dfcbc6 100644
--- a/src/saveload/saveload.cpp
+++ b/src/saveload/saveload.cpp
@@ -267,8 +267,9 @@
  *  197   27978   1.8.x
  *  198
  *  199
+ *  200
  */
-extern const uint16 SAVEGAME_VERSION = 199; ///< Current savegame version of OpenTTD.
+extern const uint16 SAVEGAME_VERSION = 200; ///< Current savegame version of OpenTTD.
 
 SavegameType _savegame_type; ///< type of savegame we are loading
 FileToSaveLoad _file_to_saveload; ///< File to save or load in the openttd loop.
diff --git a/src/tunnel_map.h b/src/tunnel_map.h
index e200a1275..d6f475d05 100644
--- a/src/tunnel_map.h
+++ b/src/tunnel_map.h
@@ -58,6 +58,7 @@ static inline void MakeRoadTunnel(TileIndex t, Owner o, DiagDirection d, RoadTyp
 	_m[t].m5 = TRANSPORT_ROAD << 2 | d;
 	SB(_me[t].m6, 2, 4, 0);
 	_me[t].m7 = 0;
+	_me[t].m8 = 0;
 	SetRoadOwner(t, ROADTYPE_ROAD, o);
 	if (o != OWNER_TOWN) SetRoadOwner(t, ROADTYPE_TRAM, o);
 	SetRoadTypes(t, r);
@@ -75,11 +76,12 @@ static inline void MakeRailTunnel(TileIndex t, Owner o, DiagDirection d, RailTyp
 	SetTileType(t, MP_TUNNELBRIDGE);
 	SetTileOwner(t, o);
 	_m[t].m2 = 0;
-	_m[t].m3 = r;
+	_m[t].m3 = 0;
 	_m[t].m4 = 0;
 	_m[t].m5 = TRANSPORT_RAIL << 2 | d;
 	SB(_me[t].m6, 2, 4, 0);
 	_me[t].m7 = 0;
+	_me[t].m8 = r;
 }
 
 #endif /* TUNNEL_MAP_H */
-- 
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