mirror of https://github.com/OpenTTD/OpenTTD.git
46 lines
2.0 KiB
C
46 lines
2.0 KiB
C
/* $Id$ */
|
|
|
|
/*
|
|
* 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 depot_func.h Functions related to depots. */
|
|
|
|
#ifndef DEPOT_FUNC_H
|
|
#define DEPOT_FUNC_H
|
|
|
|
#include "tile_type.h"
|
|
#include "vehicle_type.h"
|
|
#include "direction_type.h"
|
|
#include "slope_type.h"
|
|
|
|
void ShowDepotWindow(TileIndex tile, VehicleType type);
|
|
void InitializeDepots();
|
|
|
|
void DeleteDepotHighlightOfVehicle(const Vehicle *v);
|
|
|
|
/**
|
|
* Find out if the slope of the tile is suitable to build a depot of given direction
|
|
* @param direction The direction in which the depot's exit points
|
|
* @param tileh The slope of the tile in question
|
|
* @return true if the construction is possible
|
|
|
|
* This is checked by the ugly 0x4C >> direction magic, which does the following:
|
|
* 0x4C is 0100 1100 and tileh has only bits 0..3 set (steep tiles are ruled out)
|
|
* So: for direction (only the significant bits are shown)<p>
|
|
* 00 (exit towards NE) we need either bit 2 or 3 set in tileh: 0x4C >> 0 = 1100<p>
|
|
* 01 (exit towards SE) we need either bit 1 or 2 set in tileh: 0x4C >> 1 = 0110<p>
|
|
* 02 (exit towards SW) we need either bit 0 or 1 set in tileh: 0x4C >> 2 = 0011<p>
|
|
* 03 (exit towards NW) we need either bit 0 or 4 set in tileh: 0x4C >> 3 = 1001<p>
|
|
* So ((0x4C >> direction) & tileh) determines whether the depot can be built on the current tileh
|
|
*/
|
|
static inline bool CanBuildDepotByTileh(DiagDirection direction, Slope tileh)
|
|
{
|
|
return ((0x4C >> direction) & tileh) != 0;
|
|
}
|
|
|
|
#endif /* DEPOT_FUNC_H */
|