summaryrefslogtreecommitdiff
path: root/src/base_station_base.h
blob: f4c26fa7eacf8d779c960dad51c491a2f09a92e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/* $Id$ */

/*
 * 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 base_station_base.h Base classes/functions for base stations. */

#ifndef BASE_STATION_BASE_H
#define BASE_STATION_BASE_H

#include "station_type.h"
#include "core/pool_type.hpp"
#include "town_type.h"
#include "strings_type.h"
#include "date_type.h"
#include "company_type.h"
#include "viewport_type.h"
#include "station_map.h"

typedef Pool<BaseStation, StationID, 32, 64000> StationPool;
extern StationPool _station_pool;

struct StationSpecList {
	const StationSpec *spec;
	uint32 grfid;      ///< GRF ID of this custom station
	uint8  localidx;   ///< Station ID within GRF of station
};


/** StationRect - used to track station spread out rectangle - cheaper than scanning whole map */
struct StationRect : public Rect {
	enum StationRectMode
	{
		ADD_TEST = 0,
		ADD_TRY,
		ADD_FORCE
	};

	StationRect();
	void MakeEmpty();
	bool PtInExtendedRect(int x, int y, int distance = 0) const;
	bool IsEmpty() const;
	bool BeforeAddTile(TileIndex tile, StationRectMode mode);
	bool BeforeAddRect(TileIndex tile, int w, int h, StationRectMode mode);
	bool AfterRemoveTile(BaseStation *st, TileIndex tile);
	bool AfterRemoveRect(BaseStation *st, TileIndex tile, int w, int h);

	static bool ScanForStationTiles(StationID st_id, int left_a, int top_a, int right_a, int bottom_a);

	StationRect& operator = (Rect src);
};

/** Base class for all station-ish types */
struct BaseStation : StationPool::PoolItem<&_station_pool> {
	TileIndex xy;                   ///< Base tile of the station
	ViewportSign sign;              ///< NOSAVE: Dimensions of sign
	byte delete_ctr;                ///< Delete counter. If greater than 0 then it is decremented until it reaches 0; the waypoint is then is deleted.

	char *name;                     ///< Custom name
	StringID string_id;             ///< Default name (town area) of station

	Town *town;                     ///< The town this station is associated with
	OwnerByte owner;                ///< The owner of this station
	StationFacilityByte facilities; ///< The facilities that this station has

	uint8 num_specs;                ///< Number of specs in the speclist
	StationSpecList *speclist;      ///< List of station specs of this station

	Date build_date;                ///< Date of construction

	uint16 random_bits;             ///< Random bits assigned to this station
	byte waiting_triggers;          ///< Waiting triggers (NewGRF) for this station
	uint8 cached_anim_triggers;     ///< NOSAVE: Combined animation trigger bitmask, used to determine if trigger processing should happen.

	TileArea train_station;         ///< Tile area the train 'station' part covers
	StationRect rect;               ///< NOSAVE: Station spread out rectangle maintained by StationRect::xxx() functions

	/**
	 * Initialize the base station.
	 * @param tile The location of the station sign
	 */
	BaseStation(TileIndex tile) :
		xy(tile),
		train_station(INVALID_TILE, 0, 0)
	{
	}

	virtual ~BaseStation();

	/**
	 * Check whether a specific tile belongs to this station.
	 * @param tile the tile to check
	 * @return true if the tile belongs to this station
	 */
	virtual bool TileBelongsToRailStation(TileIndex tile) const = 0;

	/**
	 * Helper function to get a NewGRF variable that isn't implemented by the base class.
	 * @param object the resolver object related to this query
	 * @param variable that is queried
	 * @param parameter parameter for that variable
	 * @param available will return false if ever the variable asked for does not exist
	 * @return the value stored in the corresponding variable
	 */
	virtual uint32 GetNewGRFVariable(const struct ResolverObject *object, byte variable, byte parameter, bool *available) const = 0;

	/**
	 * Update the coordinated of the sign (as shown in the viewport).
	 */
	virtual void UpdateVirtCoord() = 0;

	/**
	 * Get the tile area for a given station type.
	 * @param ta tile area to fill.
	 * @param type the type of the area
	 */
	virtual void GetTileArea(TileArea *ta, StationType type) const = 0;


	/**
	 * Obtain the length of a platform
	 * @pre tile must be a rail station tile
	 * @param tile A tile that contains the platform in question
	 * @return The length of the platform
	 */
	virtual uint GetPlatformLength(TileIndex tile) const = 0;

	/**
	 * Determines the REMAINING length of a platform, starting at (and including)
	 * the given tile.
	 * @param tile the tile from which to start searching. Must be a rail station tile
	 * @param dir The direction in which to search.
	 * @return The platform length
	 */
	virtual uint GetPlatformLength(TileIndex tile, DiagDirection dir) const = 0;

	/**
	 * Get the base station belonging to a specific tile.
	 * @param tile The tile to get the base station from.
	 * @return the station associated with that tile.
	 */
	static FORCEINLINE BaseStation *GetByTile(TileIndex tile)
	{
		return BaseStation::Get(GetStationIndex(tile));
	}

	/**
	 * Check whether the base station currently is in use; in use means
	 * that it is not scheduled for deletion and that it still has some
	 * facilities left.
	 * @return true if still in use
	 */
	FORCEINLINE bool IsInUse() const
	{
		return (this->facilities & ~FACIL_WAYPOINT) != 0;
	}

	static void PostDestructor(size_t index);
};

#define FOR_ALL_BASE_STATIONS(var) FOR_ALL_ITEMS_FROM(BaseStation, station_index, var, 0)

/**
 * Class defining several overloaded accessors so we don't
 * have to cast base stations that often
 */
template <class T, bool Tis_waypoint>
struct SpecializedStation : public BaseStation {
	static const StationFacility EXPECTED_FACIL = Tis_waypoint ? FACIL_WAYPOINT : FACIL_NONE; ///< Specialized type

	/**
	 * Set station type correctly
	 * @param tile The base tile of the station.
	 */
	FORCEINLINE SpecializedStation<T, Tis_waypoint>(TileIndex tile) :
			BaseStation(tile)
	{
		this->facilities = EXPECTED_FACIL;
	}

	/**
	 * Helper for checking whether the given station is of this type.
	 * @param st the station to check.
	 * @return true if the station is the type we expect it to be.
	 */
	static FORCEINLINE bool IsExpected(const BaseStation *st)
	{
		return (st->facilities & FACIL_WAYPOINT) == EXPECTED_FACIL;
	}

	/**
	 * Tests whether given index is a valid index for station of this type
	 * @param index tested index
	 * @return is this index valid index of T?
	 */
	static FORCEINLINE bool IsValidID(size_t index)
	{
		return BaseStation::IsValidID(index) && IsExpected(BaseStation::Get(index));
	}

	/**
	 * Gets station with given index
	 * @return pointer to station with given index casted to T *
	 */
	static FORCEINLINE T *Get(size_t index)
	{
		return (T *)BaseStation::Get(index);
	}

	/**
	 * Returns station if the index is a valid index for this station type
	 * @return pointer to station with given index if it's a station of this type
	 */
	static FORCEINLINE T *GetIfValid(size_t index)
	{
		return IsValidID(index) ? Get(index) : NULL;
	}

	/**
	 * Get the station belonging to a specific tile.
	 * @param tile The tile to get the station from.
	 * @return the station associated with that tile.
	 */
	static FORCEINLINE T *GetByTile(TileIndex tile)
	{
		return GetIfValid(GetStationIndex(tile));
	}

	/**
	 * Converts a BaseStation to SpecializedStation with type checking.
	 * @param st BaseStation pointer
	 * @return pointer to SpecializedStation
	 */
	static FORCEINLINE T *From(BaseStation *st)
	{
		assert(IsExpected(st));
		return (T *)st;
	}

	/**
	 * Converts a const BaseStation to const SpecializedStation with type checking.
	 * @param st BaseStation pointer
	 * @return pointer to SpecializedStation
	 */
	static FORCEINLINE const T *From(const BaseStation *st)
	{
		assert(IsExpected(st));
		return (const T *)st;
	}
};

#define FOR_ALL_BASE_STATIONS_OF_TYPE(name, var) FOR_ALL_ITEMS_FROM(name, station_index, var, 0) if (name::IsExpected(var))

#endif /* STATION_BASE_H */