(svn r5070) Merged the bridge branch
-Feature: Bridges can now be placed above:
Any railway track combination (excluding depots and waypoints)
Any road combination (excluding depots)
Clear tiles (duh), including fields
Tunnel entrances
Bridge heads

Thanks to Tron for idea and implementation, KUDr for the yapf synchronization and many others for hours of testing

There are still a number of visual problems remaining, especially when electric railways are on or under the bridge.
DO NOT REPORT THOSE BUGS FOR THE TIME BEING please.

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/* $Id$ */

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#ifndef  YAPF_COSTBASE_HPP

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#define  YAPF_COSTBASE_HPP

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struct CYapfCostBase {

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	static const TrackdirBits   c_upwards_slopes[16];

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	FORCEINLINE static bool stSlopeCost(TileIndex tile, Trackdir td)

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	{

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		if (IsDiagonalTrackdir(td)) {

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

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			if ((c_upwards_slopes[tile_slope] & TrackdirToTrackdirBits(td)) != 0) {

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				return true;

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			}

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		}

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		return false;

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	}

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};

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struct CostRailSettings {

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	// look-ahead signal penalty

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};

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#endif /* YAPF_COSTBASE_HPP */