diff options
| -rw-r--r-- | src/town_cmd.cpp | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp index 91dbb9d68..df0813ff2 100644 --- a/src/town_cmd.cpp +++ b/src/town_cmd.cpp @@ -1984,18 +1984,19 @@ static inline bool TownLayoutAllows2x2HouseHere(Town *t, TileIndex tile) /* Allow towns everywhere when we don't build roads */ if (!_settings_game.economy.allow_town_roads && !_generating_world) return true; - /* MapSize() is sure dividable by both MapSizeX() and MapSizeY(), - * so to do only one memory access, use MapSize() */ - uint dx = MapSize() + TileX(t->xy) - TileX(tile); - uint dy = MapSize() + TileY(t->xy) - TileY(tile); + /* Compute relative position of tile. (Positive offsets are towards north) */ + TileIndexDiffC grid_pos = TileIndexToTileIndexDiffC(t->xy, tile); switch (t->layout) { case TL_2X2_GRID: - if ((dx % 3) != 0 || (dy % 3) != 0) return false; + grid_pos.x %= 3; + grid_pos.y %= 3; + if ((grid_pos.x != 2 && grid_pos.x != -1) || + (grid_pos.y != 2 && grid_pos.y != -1)) return false; break; case TL_3X3_GRID: - if ((dx % 4) < 2 || (dy % 4) < 2) return false; + if ((grid_pos.x & 3) < 2 || (grid_pos.y & 3) < 2) return false; break; default: |