richk@10242: /* $Id$ */
richk@10242: 
richk@10242: /** @file depot_func.h Functions related to depots. */
richk@10242: 
richk@10242: #ifndef DEPOT_FUNC_H
richk@10242: #define DEPOT_FUNC_H
richk@10242: 
richk@10242: #include "depot_type.h"
richk@10242: #include "tile_type.h"
richk@10242: #include "vehicle_type.h"
richk@10242: #include "direction_type.h"
richk@10242: #include "slope_type.h"
richk@10242: 
richk@10242: void ShowDepotWindow(TileIndex tile, VehicleType type);
richk@10242: void InitializeDepots();
richk@10242: 
richk@10242: void DeleteDepotHighlightOfVehicle(const Vehicle *v);
richk@10242: 
richk@10242: /**
richk@10242:  * Find out if the slope of the tile is suitable to build a depot of given direction
richk@10242:  * @param direction The direction in which the depot's exit points
richk@10242:  * @param tileh The slope of the tile in question
richk@10242:  * @return true if the construction is possible
richk@10242: 
richk@10242:  * This is checked by the ugly 0x4C >> direction magic, which does the following:
richk@10242:  * 0x4C is 0100 1100 and tileh has only bits 0..3 set (steep tiles are ruled out)
richk@10242:  * So: for direction (only the significant bits are shown)<p>
richk@10242:  * 00 (exit towards NE) we need either bit 2 or 3 set in tileh: 0x4C >> 0 = 1100<p>
richk@10242:  * 01 (exit towards SE) we need either bit 1 or 2 set in tileh: 0x4C >> 1 = 0110<p>
richk@10242:  * 02 (exit towards SW) we need either bit 0 or 1 set in tileh: 0x4C >> 2 = 0011<p>
richk@10242:  * 03 (exit towards NW) we need either bit 0 or 4 set in tileh: 0x4C >> 3 = 1001<p>
richk@10242:  * So ((0x4C >> direction) & tileh) determines whether the depot can be built on the current tileh
richk@10242:  */
richk@10242: static inline bool CanBuildDepotByTileh(DiagDirection direction, Slope tileh)
richk@10242: {
richk@10242: 	return ((0x4C >> direction) & tileh) != 0;
richk@10242: }
richk@10242: 
richk@10242: #endif /* DEPOT_FUNC_H */