Add: Station variable 6B to get extended station id of nearby tiles (#10953)

src/newgrf_roadstop.cpp

@@ -171,6 +171,23 @@ uint32_t RoadStopScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint
 			return ssl.grfid;
 		}
 
+		/* 16 bit road stop ID of nearby tiles */
+		case 0x6B: {
+			TileIndex nearby_tile = GetNearbyTile(parameter, this->tile);
+
+			if (!IsRoadStopTile(nearby_tile)) return 0xFFFFFFFF;
+			if (!IsCustomRoadStopSpecIndex(nearby_tile)) return 0xFFFE;
+
+			uint32_t grfid = this->st->roadstop_speclist[GetCustomRoadStopSpecIndex(this->tile)].grfid;
+
+			const RoadStopSpecList ssl = BaseStation::GetByTile(nearby_tile)->roadstop_speclist[GetCustomRoadStopSpecIndex(nearby_tile)];
+			if (ssl.grfid == grfid) {
+				return ssl.localidx;
+			}
+
+			return 0xFFFE;
+		}
+
 		case 0xF0: return this->st == nullptr ? 0 : this->st->facilities; // facilities
 
 		case 0xFA: return ClampTo<uint16_t>((this->st == nullptr ? TimerGameCalendar::date : this->st->build_date) - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); // build date

src/newgrf_station.cpp

@@ -376,6 +376,22 @@ TownScopeResolver *StationResolverObject::GetTown()
 			return ssl.grfid;
 		}
 
+		case 0x6B: { // 16 bit Station ID of nearby tiles
+			TileIndex nearby_tile = GetNearbyTile(parameter, this->tile);
+
+			if (!HasStationTileRail(nearby_tile)) return 0xFFFFFFFF;
+			if (!IsCustomStationSpecIndex(nearby_tile)) return 0xFFFE;
+
+			uint32_t grfid = this->st->speclist[GetCustomStationSpecIndex(this->tile)].grfid;
+
+			const StationSpecList ssl = BaseStation::GetByTile(nearby_tile)->speclist[GetCustomStationSpecIndex(nearby_tile)];
+			if (ssl.grfid == grfid) {
+				return ssl.localidx;
+			}
+
+			return 0xFFFE;
+		}
+
 		/* General station variables */
 		case 0x82: return 50;
 		case 0x84: return this->st->string_id;

src/table/newgrf_debug_data.h

@@ -131,6 +131,7 @@ static const NIVariable _niv_stations[] = {
 	NIV(0x68, "station info of nearby tiles"),
 	NIV(0x69, "information about cargo accepted in the past"),
 	NIV(0x6A, "GRFID of nearby station tiles"),
+	NIV(0x6B, "station ID of nearby tiles"),
 	NIV_END()
 };
 
@@ -689,6 +690,7 @@ static const NIVariable _nif_roadstops[] = {
 	NIV(0x68, "road stop info of nearby tiles"),
 	NIV(0x69, "information about cargo accepted in the past"),
 	NIV(0x6A, "GRFID of nearby road stop tiles"),
+	NIV(0x6B, "road stop ID of nearby tiles"),
 	NIV_END(),
 };