removed some slope checks

1 files changed, 10 insertions, 11 deletions

diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index 1707bdf15..60396da7a 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -776,7 +776,7 @@ CommandCost ClearTile_Station(TileIndex tile, DoCommandFlag flags);
  * Checks if the given tile is buildable, flat and has a certain height.
  * @param tile TileIndex to check.
  * @param invalid_dirs Prohibited directions for slopes (set of #DiagDirection).
- * @param allowed_z Height allowed for the tile. If allowed_z is negative, it will be set to the height of this tile.
+ * @param allowed_z Height allowed for the tile. If allowed_z is -1, it will be set to the height of this tile.
  * @param allow_steep Whether steep slopes are allowed.
  * @param check_bridge Check for the existence of a bridge.
  * @return The cost in case of success, or an error code if it failed.
@@ -814,11 +814,11 @@ CommandCost CheckBuildableTile(TileIndex tile, uint invalid_dirs, int &allowed_z
 		cost.AddCost(_price[PR_BUILD_FOUNDATION]);
 	}
 
-	/* The level of this tile must be equal to allowed_z.	 */
-	if (allowed_z < 0) {
+	/* The level of this tile must be equal to allowed_z. */
+	if (allowed_z == -1) {
 		/* First tile. */
 		allowed_z = flat_z;
-	} else if (allowed_z != flat_z) {
+	} else if (allowed_z != flat_z && allowed_z >= 0) {
 		return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
 	}
 
@@ -866,14 +866,14 @@ static CommandCost CheckFlatLandAirport(AirportTileTableIterator tile_iter, DoCo
 static CommandCost CheckFlatLandRailStation(TileArea tile_area, DoCommandFlag flags, Axis axis, StationID *station, RailType rt, std::vector<Train *> &affected_vehicles, StationClassID spec_class, byte spec_index, byte plat_len, byte numtracks)
 {
 	CommandCost cost(EXPENSES_CONSTRUCTION);
-	int allowed_z = -1;
+	int allowed_z = -2;
 	uint invalid_dirs = 5 << axis;
 
 	const StationSpec *statspec = StationClass::Get(spec_class)->GetSpec(spec_index);
 	bool slope_cb = statspec != nullptr && HasBit(statspec->callback_mask, CBM_STATION_SLOPE_CHECK);
 
 	for (TileIndex tile_cur : tile_area) {
-		CommandCost ret = CheckBuildableTile(tile_cur, invalid_dirs, allowed_z, false);
+		CommandCost ret = CheckBuildableTile(tile_cur, 0, allowed_z, true);
 		if (ret.Failed()) return ret;
 		cost.AddCost(ret);
 
@@ -949,14 +949,13 @@ static CommandCost CheckFlatLandRailStation(TileArea tile_area, DoCommandFlag fl
  * @param rt Road type to build.
  * @return The cost in case of success, or an error code if it failed.
  */
-static CommandCost CheckFlatLandRoadStop(TileArea tile_area, DoCommandFlag flags, uint invalid_dirs, bool is_drive_through, bool is_truck_stop, Axis axis, StationID *station, RoadType rt)
+static CommandCost CheckFlatLandRoadStop(TileArea tile_area, DoCommandFlag flags, bool is_drive_through, bool is_truck_stop, Axis axis, StationID *station, RoadType rt)
 {
 	CommandCost cost(EXPENSES_CONSTRUCTION);
-	int allowed_z = -1;
-// TODO: possibly needs some checks for slope, too?
+	int allowed_z = -2;
 
 	for (TileIndex cur_tile : tile_area) {
-		CommandCost ret = CheckBuildableTile(cur_tile, invalid_dirs, allowed_z, !is_drive_through);
+		CommandCost ret = CheckBuildableTile(cur_tile, 0, allowed_z, true);
 		if (ret.Failed()) return ret;
 		cost.AddCost(ret);
 
@@ -1879,7 +1878,7 @@ CommandCost CmdBuildRoadStop(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
 	/* Total road stop cost. */
 	CommandCost cost(EXPENSES_CONSTRUCTION, roadstop_area.w * roadstop_area.h * _price[type ? PR_BUILD_STATION_TRUCK : PR_BUILD_STATION_BUS]);
 	StationID est = INVALID_STATION;
-	ret = CheckFlatLandRoadStop(roadstop_area, flags, is_drive_through ? 5 << axis : 1 << ddir, is_drive_through, type, axis, &est, rt);
+	ret = CheckFlatLandRoadStop(roadstop_area, flags, is_drive_through, type, axis, &est, rt);
 	if (ret.Failed()) return ret;
 	cost.AddCost(ret);