/* $Id$ */

/** @file autoslope.h */

#ifndef AUTOSLOPE_H

#define AUTOSLOPE_H

#include "depot.h"

/**

 * Autoslope check for tiles with an entrance on an edge.

 * E.g. depots and non-drive-through-road-stops.

 *

 * The test succeeds if the slope is not steep and at least one corner of the entrance edge is on the TileMaxZ() level.

 *

 * @note The test does not check if autoslope is enabled at all.

 *

 * @param tile The tile.

 * @param z_new New TileZ.

 * @param tileh_new New TileSlope.

 * @param entrance Entrance edge.

 * @return true iff terraforming is allowed.

 */

static inline bool AutoslopeCheckForEntranceEdge(TileIndex tile, uint z_new, Slope tileh_new, DiagDirection entrance)

{

	if (IsSteepSlope(tileh_new) || (GetTileMaxZ(tile) != z_new + GetSlopeMaxZ(tileh_new))) return false;

	return ((tileh_new == SLOPE_FLAT) || CanBuildDepotByTileh(entrance, tileh_new));

}

/**

 * Tests if autoslope is enabled for _current_player.

 *

 * Autoslope is disabled for town/industry construction and old ai players.

 *

 * @return true iff autoslope is enabled.

 */

static inline bool AutoslopeEnabled()

{

	return (_patches.autoslope && IsValidPlayer(_current_player) && !_is_old_ai_player);

}

#endif /* AUTOSLOPE_H */