src/pathfinder/yapf/yapf_costbase.hpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file yapf_costbase.hpp Handling of cost determination. */
  11
  12 #ifndef YAPF_COSTBASE_HPP
  13 #define YAPF_COSTBASE_HPP
  14
  15 /** Base implementation for cost accounting. */
  16 struct CYapfCostBase {
  17         /**
  18          * Does the given track direction on the given tile yield an uphill penalty?
  19          * @param tile The tile to check.
  20          * @param td   The track direction to check.
  21          * @return True if there's a slope, otherwise false.
  22          */
  23         inline static bool stSlopeCost(TileIndex tile, Trackdir td)
  24         {
  25                 if (IsDiagonalTrackdir(td)) {
  26                         if (IsBridgeTile(tile)) {
  27                                 /* it is bridge ramp, check if we are entering the bridge */
  28                                 if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(td)) return false; // no, we are leaving it, no penalty
  29                                 /* we are entering the bridge */
  30                                 Slope tile_slope = GetTileSlope(tile);
  31                                 Axis axis = DiagDirToAxis(GetTunnelBridgeDirection(tile));
  32                                 return !HasBridgeFlatRamp(tile_slope, axis);
  33                         } else {
  34                                 /* not bridge ramp */
  35                                 if (IsTunnelTile(tile)) return false; // tunnel entry/exit doesn't slope
  36                                 Slope tile_slope = GetTileSlope(tile);
  37                                 return IsUphillTrackdir(tile_slope, td); // slopes uphill => apply penalty
  38                         }
  39                 }
  40                 return false;
  41         }
  42 };
  43
  44 #endif /* YAPF_COSTBASE_HPP */