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/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file autoslope.h Functions related to autoslope. */
#ifndef AUTOSLOPE_H
#define AUTOSLOPE_H
#include "company_func.h"
#include "depot_func.h"
#include "slope_func.h"
#include "tile_map.h"
#include "openttd.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_company.
*
* Autoslope is disabled for town/industry construction.
*
* @return true iff autoslope is enabled.
*/
static inline bool AutoslopeEnabled()
{
return (_settings_game.construction.autoslope &&
(_current_company < MAX_COMPANIES ||
(_current_company == OWNER_NONE && _game_mode == GM_EDITOR)));
}
#endif /* AUTOSLOPE_H */
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