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