1 /* $Id$ */

     2 

     3 #ifndef  YAPF_COSTBASE_HPP

     4 #define  YAPF_COSTBASE_HPP

     5 

     6 struct CYapfCostBase {

     7 	static const TrackdirBits   c_upwards_slopes[16];

     8 

     9 	FORCEINLINE static bool stSlopeCost(TileIndex tile, Trackdir td)

    10 	{

    11 		if (IsDiagonalTrackdir(td)) {

    12 			if (IsBridgeTile(tile)) {

    13 				// it is bridge ramp, check if we are entering the bridge

    14 				if (GetBridgeRampDirection(tile) != TrackdirToExitdir(td)) return false; // no, we are living it, no penalty

    15 				// we are entering the bridge

    16 				// if the tile slope is downwards, then bridge ramp has not upward slope

    17 				uint tile_slope = GetTileSlope(tile, NULL) & 0x0F;

    18 				if ((c_upwards_slopes[tile_slope] & TrackdirToTrackdirBits(ReverseTrackdir(td))) != 0) return false; // tile under ramp goes down, no penalty

    19 				// tile under ramp isn't going down, so ramp must go up

    20 				return true;

    21 			} else {

    22 				// not bridge ramp

    23 				if (IsTunnelTile(tile)) return false; // tunnel entry/exit doesn't slope

    24 				uint tile_slope = GetTileSlope(tile, NULL) & 0x0F;

    25 				if ((c_upwards_slopes[tile_slope] & TrackdirToTrackdirBits(td)) != 0) return true; // slopes uphill => apply penalty

    26 			}

    27 		}

    28 		return false;

    29 	}

    30 };

    31 

    32 struct CostRailSettings {

    33 	// look-ahead signal penalty

    34 };

    35 

    36 

    37 #endif /* YAPF_COSTBASE_HPP */