1 files changed, 24 insertions, 37 deletions

diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index 560563292..1707bdf15 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -814,9 +814,9 @@ CommandCost CheckBuildableTile(TileIndex tile, uint invalid_dirs, int &allowed_z
 		cost.AddCost(_price[PR_BUILD_FOUNDATION]);
 	}
 
-	/* get corresponding flat level and make sure that all parts of the station have the same level. */
-	if (allowed_z == -1) {
-		/* first tile */
+	/* The level of this tile must be equal to allowed_z.	 */
+	if (allowed_z < 0) {
+		/* First tile. */
 		allowed_z = flat_z;
 	} else if (allowed_z != flat_z) {
 		return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
@@ -855,7 +855,6 @@ static CommandCost CheckFlatLandAirport(AirportTileTableIterator tile_iter, DoCo
  * @param flags Operation to perform.
  * @param axis Rail station axis.
  * @param station StationID to be queried and returned if available.
- * @param bool check_facing_slope to check which stations are allowed to build on slopes facing the slope
  * @param rt The rail type to check for (overbuilding rail stations over rail).
  * @param affected_vehicles List of trains with PBS reservations on the tiles
  * @param spec_class Station class.
@@ -864,7 +863,7 @@ static CommandCost CheckFlatLandAirport(AirportTileTableIterator tile_iter, DoCo
  * @param numtracks Number of platforms.
  * @return The cost in case of success, or an error code if it failed.
  */
-static CommandCost CheckFlatLandRailStation(TileArea tile_area, DoCommandFlag flags, Axis axis, StationID *station, bool check_facing_slope, RailType rt, std::vector<Train *> &affected_vehicles, StationClassID spec_class, byte spec_index, byte plat_len, byte numtracks)
+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;
@@ -2814,9 +2813,6 @@ bool SplitGroundSpriteForOverlay(const TileInfo *ti, SpriteID *ground, RailTrack
 	return true;
 }
 
-extern const byte _road_sloped_sprites[14];
-extern const byte _track_sloped_sprites[14];
-
 static void DrawTile_Station(TileInfo *ti)
 {
 	const NewGRFSpriteLayout *layout = nullptr;
@@ -2829,9 +2825,8 @@ static void DrawTile_Station(TileInfo *ti)
 	BaseStation *st = nullptr;
 	const StationSpec *statspec = nullptr;
 	uint tile_layout = 0;
-	RailtypeInfo *rti;
 
-	if (IsRailwayStation(ti->tile) || IsRailWaypoint(ti->tile)) {
+	if (HasStationRail(ti->tile)) {
 		rti = GetRailTypeInfo(GetRailType(ti->tile));
 		total_offset = rti->GetRailtypeSpriteOffset();
 
@@ -2908,7 +2903,7 @@ static void DrawTile_Station(TileInfo *ti)
 	if (ti->tileh != SLOPE_FLAT && (IsAirport(ti->tile) || IsStandardRoadStopTile(ti->tile)))
 		DrawFoundation(ti, FOUNDATION_LEVELED);
 
-	if (IsCustomStationSpecIndex(ti->tile)) {
+	if (HasStationTileRail(ti->tile) && IsCustomStationSpecIndex(ti->tile)) {
 		/* look for customization */
 		st = BaseStation::GetByTile(ti->tile);
 		statspec = st->speclist[GetCustomStationSpecIndex(ti->tile)].spec;
@@ -3057,31 +3052,24 @@ draw_default_foundation:
 			image += HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE) ? ground_relocation : total_offset;
 			if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) {
 				pal += ground_relocation;
-			} else if (ti->tileh != SLOPE_FLAT && (IsRailwayStation(ti->tile) || IsRoadStop(ti->tile))) {
-				/* It's a sloped rail/road station? */
+			} else if (ti->tileh != SLOPE_FLAT && IsRailStation(ti->tile)) {
+				/* It's a sloped rail station? */
 				Foundation rf = FOUNDATION_NONE;
-				if (IsRoadStop(ti->tile)) {
-					/* Roadstops without foundation on a slope
-					 * and on Slopes with one corner raised */
-					rf = GetRoadFoundation(ti->tileh, AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(ti->tile))));
-					DrawFoundation(ti, rf);
-					/* Draws the sloped road */
-					if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
+				/* sloped rail station */
+				TrackBits track = AxisToTrackBits(GetRailStationAxis(ti->tile));
+				rf = GetRailFoundation(ti->tileh, track);
+				DrawFoundation(ti, rf);
+				if (rf != FOUNDATION_LEVELED) {
+					image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
 				} else {
-					/* sloped rail station */
-					TrackBits track = AxisToTrackBits(GetRailStationAxis(ti->tile));
-					rf = GetRailFoundation(ti->tileh, track);
-					DrawFoundation(ti, rf);
-					if (rf != FOUNDATION_LEVELED) {
-						image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
-					} else {
-						(image = rti->base_sprites.track_y, track == TRACK_BIT_Y ) || (image++, track == TRACK_BIT_X);
-					}
+					(image = rti->base_sprites.track_y, track == TRACK_BIT_Y ) || (image++, track == TRACK_BIT_X);
 				}
+			}
 			DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, palette));
 
 			/* PBS debugging, draw reserved tracks darker */
 			if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasStationRail(ti->tile) && HasStationReservation(ti->tile)) {
+				const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
 				TrackBits pbs = AxisToTrackBits(GetRailStationAxis(ti->tile));
 				// TODO: possibly inverted in 7b136d1fddbb2d0840076dfe2ddbe666b29fee8d
 				if (pbs & TRACK_BIT_X) {
@@ -3195,15 +3183,14 @@ void StationPickerDrawSprite(int x, int y, StationType st, RailType railtype, Ro
 
 static int GetSlopePixelZ_Station(TileIndex tile, uint x, uint y)
 {
-	Axis axis;
-	uint z;
-	Slope tileh = GetTileSlope(tile, &z);
-
 	/* this code makes vehicles and trains follow the slope on sloped stations */
-	if (IsRailwayStation(tile) || IsRoadStopTile(tile) && !IsStandardRoadStopTile(tile)) {
-		axis = IsRailwayStation(tile)?GetRailStationAxis(tile):DiagDirToAxis(GetRoadStopDir(tile));	
-		z += ApplyFoundationToSlope(GetRailFoundation(tileh,AxisToTrackBits(axis)), &tileh);
-		return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
+	if (IsRailStation(tile)) {
+		int z;
+		Slope tileh = GetTilePixelSlope(tile, &z);
+		Axis axis = GetRailStationAxis(tile);
+
+		z += 8*ApplyFoundationToSlope(GetRailFoundation(tileh,AxisToTrackBits(axis)), &tileh);
+		return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
 	}
 
 	return GetTileMaxPixelZ(tile);