src/pathfinder/yapf/yapf_costbase.hpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file yapf_costbase.hpp Handling of cost determination. */
   9
  10 #ifndef YAPF_COSTBASE_HPP
  11 #define YAPF_COSTBASE_HPP
  12
  13 /** Base implementation for cost accounting. */
  14 struct CYapfCostBase {
  15         /**
  16          * Does the given track direction on the given tile yield an uphill penalty?
  17          * @param tile The tile to check.
  18          * @param td   The track direction to check.
  19          * @return True if there's a slope, otherwise false.
  20          */
  21         inline static bool stSlopeCost(TileIndex tile, Trackdir td)
  22         {
  23                 if (IsDiagonalTrackdir(td)) {
  24                         if (IsBridgeTile(tile)) {
  25                                 /* it is bridge ramp, check if we are entering the bridge */
  26                                 if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(td)) return false; // no, we are leaving it, no penalty
  27                                 /* we are entering the bridge */
  28                                 Slope tile_slope = GetTileSlope(tile);
  29                                 Axis axis = DiagDirToAxis(GetTunnelBridgeDirection(tile));
  30                                 return !HasBridgeFlatRamp(tile_slope, axis);
  31                         } else {
  32                                 /* not bridge ramp */
  33                                 if (IsTunnelTile(tile)) return false; // tunnel entry/exit doesn't slope
  34                                 Slope tile_slope = GetTileSlope(tile);
  35                                 return IsUphillTrackdir(tile_slope, td); // slopes uphill => apply penalty
  36                         }
  37                 }
  38                 return false;
  39         }
  40 };
  41
  42 #endif /* YAPF_COSTBASE_HPP */