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/* $Id$ */

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/** @file autoslope.h Functions related to autoslope. */

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#ifndef AUTOSLOPE_H

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#define AUTOSLOPE_H

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#include "settings_type.h"

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#include "player_func.h"

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#include "depot_func.h"

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/**

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

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

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 *

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

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 *

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

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 *

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 * @param tile The tile.

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 * @param z_new New TileZ.

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 * @param tileh_new New TileSlope.

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 * @param entrance Entrance edge.

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 * @return true iff terraforming is allowed.

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 */

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

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{

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

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

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}

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/**

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 * Tests if autoslope is enabled for _current_player.

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 *

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

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 *

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 * @return true iff autoslope is enabled.

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 */

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static inline bool AutoslopeEnabled()

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{

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	return (_patches.autoslope &&

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	        ((IsValidPlayer(_current_player) && !_is_old_ai_player) ||

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	         (_current_player == OWNER_NONE && _game_mode == GM_EDITOR)));

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}

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#endif /* AUTOSLOPE_H */