summaryrefslogtreecommitdiff
path: root/src/roadstop.cpp
blob: 9547814b7a7affeca7bec0e2b3ef1fe653a4266d (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
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
/* $Id$ */

/*
 * 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 roadstop.cpp Implementation of the roadstop base class. */

#include "stdafx.h"
#include "roadveh.h"
#include "core/pool_func.hpp"
#include "roadstop_base.h"
#include "station_base.h"
#include "vehicle_func.h"
#include "landscape.h"

RoadStopPool _roadstop_pool("RoadStop");
INSTANTIATE_POOL_METHODS(RoadStop)

/**
 * De-Initializes RoadStops.
 */
RoadStop::~RoadStop()
{
	/* When we are the head we need to free the entries */
	if (HasBit(this->status, RSSFB_BASE_ENTRY)) {
		delete this->east;
		delete this->west;
	}

	if (CleaningPool()) return;
}

/**
 * Get the next road stop accessible by this vehicle.
 * @param v the vehicle to get the next road stop for.
 * @return the next road stop accessible.
 */
RoadStop *RoadStop::GetNextRoadStop(const RoadVehicle *v) const
{
	for (RoadStop *rs = this->next; rs != NULL; rs = rs->next) {
		/* The vehicle cannot go to this roadstop (different roadtype) */
		if ((GetRoadTypes(rs->xy) & v->compatible_roadtypes) == ROADTYPES_NONE) continue;
		/* The vehicle is articulated and can therefor not go the a standard road stop */
		if (IsStandardRoadStopTile(rs->xy) && v->HasArticulatedPart()) continue;

		/* The vehicle can actually go to this road stop. So, return it! */
		return rs;
	}

	return NULL;
}

/**
 * Join this road stop to another 'base' road stop if possible;
 * fill all necessary data to become an actual drive through road stop.
 * Also update the length etc.
 */
void RoadStop::MakeDriveThrough()
{
	assert(this->east == NULL && this->west == NULL);

	RoadStopType rst = GetRoadStopType(this->xy);
	DiagDirection dir = GetRoadStopDir(this->xy);
	/* Use absolute so we always go towards the nortern tile */
	TileIndexDiff offset = abs(TileOffsByDiagDir(dir));

	/* Information about the tile north of us */
	TileIndex north_tile = this->xy - offset;
	bool north = IsDriveThroughRoadStopContinuation(this->xy, north_tile);
	RoadStop *rs_north = north ? RoadStop::GetByTile(north_tile, rst) : NULL;

	/* Information about the tile south of us */
	TileIndex south_tile = this->xy + offset;
	bool south = IsDriveThroughRoadStopContinuation(this->xy, south_tile);
	RoadStop *rs_south = south ? RoadStop::GetByTile(south_tile, rst) : NULL;

	/* Amount of road stops that will be added to the 'northern' head */
	int added = 1;
	if (north && rs_north->east != NULL) { // (east != NULL) == (west != NULL)
		/* There is a more nothern one, so this can join them */
		this->east = rs_north->east;
		this->west = rs_north->west;

		if (south && rs_south->east != NULL) { // (east != NULL) == (west != NULL)
			/* There more southern tiles too, they must 'join' us too */
			ClrBit(rs_south->status, RSSFB_BASE_ENTRY);
			this->east->occupied += rs_south->east->occupied;
			this->west->occupied += rs_south->west->occupied;

			/* Free the now unneeded entry structs */
			delete rs_south->east;
			delete rs_south->west;

			/* Make all 'children' of the southern tile take the new master */
			for (; IsDriveThroughRoadStopContinuation(this->xy, south_tile); south_tile += offset) {
				rs_south = RoadStop::GetByTile(south_tile, rst);
				if (rs_south->east == NULL) break;
				rs_south->east = rs_north->east;
				rs_south->west = rs_north->west;
				added++;
			}
		}
	} else if (south && rs_south->east != NULL) { // (east != NULL) == (west != NULL)
		/* There is one to the south, but not to the north... so we become 'parent' */
		this->east = rs_south->east;
		this->west = rs_south->west;
		SetBit(this->status, RSSFB_BASE_ENTRY);
		ClrBit(rs_south->status, RSSFB_BASE_ENTRY);
	} else {
		/* We are the only... so we are automatically the master */
		this->east = new Entry();
		this->west = new Entry();
		SetBit(this->status, RSSFB_BASE_ENTRY);
	}

	/* Now update the lengths */
	added *= TILE_SIZE;
	this->east->length += added;
	this->west->length += added;
}

/**
 * Prepare for removal of this stop; update other neighbouring stops
 * if needed. Also update the length etc.
 */
void RoadStop::ClearDriveThrough()
{
	assert(this->east != NULL && this->west != NULL);

	RoadStopType rst = GetRoadStopType(this->xy);
	DiagDirection dir = GetRoadStopDir(this->xy);
	/* Use absolute so we always go towards the nortern tile */
	TileIndexDiff offset = abs(TileOffsByDiagDir(dir));

	/* Information about the tile north of us */
	TileIndex north_tile = this->xy - offset;
	bool north = IsDriveThroughRoadStopContinuation(this->xy, north_tile);
	RoadStop *rs_north = north ? RoadStop::GetByTile(north_tile, rst) : NULL;

	/* Information about the tile south of us */
	TileIndex south_tile = this->xy + offset;
	bool south = IsDriveThroughRoadStopContinuation(this->xy, south_tile);
	RoadStop *rs_south = south ? RoadStop::GetByTile(south_tile, rst) : NULL;

	/* Must only be cleared after we determined which neighbours are
	 * part of our little entry 'queue' */
	DoClearSquare(this->xy);

	if (north) {
		/* There is a tile to the north, so we can't clear ourselves. */
		if (south) {
			/* There are more southern tiles too, they must be split;
			 * first make the new southern 'base' */
			SetBit(rs_south->status, RSSFB_BASE_ENTRY);
			rs_south->east = new Entry();
			rs_south->west = new Entry();

			/* Keep track of the base because we need it later on */
			RoadStop *rs_south_base = rs_south;
			TileIndex base_tile = south_tile;

			/* Make all (even more) southern stops part of the new entry queue */
			for (south_tile += offset; IsDriveThroughRoadStopContinuation(base_tile, south_tile); south_tile += offset) {
				rs_south = RoadStop::GetByTile(south_tile, rst);
				rs_south->east = rs_south_base->east;
				rs_south->west = rs_south_base->west;
			}

			/* Find the other end; the northern most tile */
			for (; IsDriveThroughRoadStopContinuation(base_tile, north_tile); north_tile -= offset) {
				rs_north = RoadStop::GetByTile(north_tile, rst);
			}

			/* We have to rebuild the entries because we cannot easily determine
			 * how full each part is. So instead of keeping and maintaining a list
			 * of vehicles and using that to 'rebuild' the occupied state we just
			 * rebuild it from scratch as that removes lots of maintainance code
			 * for the vehicle list and it's faster in real games as long as you
			 * do not keep split and merge road stop every tick by the millions. */
			rs_south_base->east->Rebuild(rs_south_base);
			rs_south_base->west->Rebuild(rs_south_base);

			assert(HasBit(rs_north->status, RSSFB_BASE_ENTRY));
			rs_north->east->Rebuild(rs_north);
			rs_north->west->Rebuild(rs_north);
		} else {
			/* Only we left, so simple update the length. */
			rs_north->east->length -= TILE_SIZE;
			rs_north->west->length -= TILE_SIZE;
		}
	} else if (south) {
		/* There is only something to the south. Hand over the base entry */
		SetBit(rs_south->status, RSSFB_BASE_ENTRY);
		rs_south->east->length -= TILE_SIZE;
		rs_south->west->length -= TILE_SIZE;
	} else {
		/* We were the last */
		delete this->east;
		delete this->west;
	}

	/* Make sure we don't get used for something 'incorrect' */
	ClrBit(this->status, RSSFB_BASE_ENTRY);
	this->east = NULL;
	this->west = NULL;
}

/**
 * Leave the road stop
 * @param rv the vehicle that leaves the stop
 */
void RoadStop::Leave(RoadVehicle *rv)
{
	if (IsStandardRoadStopTile(rv->tile)) {
		/* Vehicle is leaving a road stop tile, mark bay as free */
		this->FreeBay(HasBit(rv->state, RVS_USING_SECOND_BAY));
		this->SetEntranceBusy(false);
	} else {
		/* Otherwise just leave the drive through's entry cache. */
		this->GetEntry(DirToDiagDir(rv->direction))->Leave(rv);
	}
}

/**
 * Enter the road stop
 * @param rv   the vehicle that enters the stop
 * @return whether the road stop could actually be entered
 */
bool RoadStop::Enter(RoadVehicle *rv)
{
	if (IsStandardRoadStopTile(this->xy)) {
		/* For normal (non drive-through) road stops
		 * Check if station is busy or if there are no free bays or whether it is a articulated vehicle. */
		if (this->IsEntranceBusy() || !this->HasFreeBay() || rv->HasArticulatedPart()) return false;

		SetBit(rv->state, RVS_IN_ROAD_STOP);

		/* Allocate a bay and update the road state */
		uint bay_nr = this->AllocateBay();
		SB(rv->state, RVS_USING_SECOND_BAY, 1, bay_nr);

		/* Mark the station entrace as busy */
		this->SetEntranceBusy(true);
		return true;
	}

	/* Vehicles entering a drive-through stop from the 'normal' side use first bay (bay 0). */
	this->GetEntry(DirToDiagDir(rv->direction))->Enter(rv);

	/* Indicate a drive-through stop */
	SetBit(rv->state, RVS_IN_DT_ROAD_STOP);
	return true;
}

/**
 * Find a roadstop at given tile
 * @param tile tile with roadstop
 * @param type roadstop type
 * @return pointer to RoadStop
 * @pre there has to be roadstop of given type there!
 */
/* static */ RoadStop *RoadStop::GetByTile(TileIndex tile, RoadStopType type)
{
	const Station *st = Station::GetByTile(tile);

	for (RoadStop *rs = st->GetPrimaryRoadStop(type);; rs = rs->next) {
		if (rs->xy == tile) return rs;
		assert(rs->next != NULL);
	}
}

/**
 * Leave the road stop
 * @param rv the vehicle that leaves the stop
 */
void RoadStop::Entry::Leave(const RoadVehicle *rv)
{
	this->occupied -= rv->rcache.cached_veh_length;
	assert(this->occupied >= 0);
}

/**
 * Enter the road stop
 * @param rv the vehicle that enters the stop
 */
void RoadStop::Entry::Enter(const RoadVehicle *rv)
{
	assert(this->occupied < this->length);
	this->occupied += rv->rcache.cached_veh_length;
}

/**
 * Checks whether the 'next' tile is still part of the road same drive through
 * stop 'rs' in the same direction for the same vehicle.
 * @param rs   the road stop tile to check against
 * @param next the 'next' tile to check
 * @return true if the 'next' tile is part of the road stop at 'next'.
 */
/* static */ bool RoadStop::IsDriveThroughRoadStopContinuation(TileIndex rs, TileIndex next)
{
	return IsTileType(next, MP_STATION) &&
			GetStationIndex(next) == GetStationIndex(rs) &&
			GetStationType(next) == GetStationType(rs) &&
			GetRoadStopDir(next) == GetRoadStopDir(rs) &&
			IsDriveThroughStopTile(next);
}

typedef std::list<const RoadVehicle *> RVList; ///< A list of road vehicles

/** Helper for finding RVs in a road stop. */
struct RoadStopEntryRebuilderHelper {
	RVList vehicles;   ///< The list of vehicles to possibly add to.
	DiagDirection dir; ///< The direction the vehicle has to face to be added.
};

/**
 * Add road vehicles to the station's list if needed.
 * @param v the found vehicle
 * @param data the extra data used to make our decision
 * @return always NULL
 */
Vehicle *FindVehiclesInRoadStop(Vehicle *v, void *data)
{
	RoadStopEntryRebuilderHelper *rserh = (RoadStopEntryRebuilderHelper*)data;
	/* Not a RV or not in the right direction or crashed :( */
	if (v->type != VEH_ROAD || DirToDiagDir(v->direction) != rserh->dir || !v->IsPrimaryVehicle() || (v->vehstatus & VS_CRASHED) != 0) return NULL;

	RoadVehicle *rv = RoadVehicle::From(v);
	/* Don't add ones not in a road stop */
	if (rv->state < RVSB_IN_ROAD_STOP) return NULL;

	/* Do not add duplicates! */
	for (RVList::iterator it = rserh->vehicles.begin(); it != rserh->vehicles.end(); it++) {
		if (rv == *it) return NULL;
	}

	rserh->vehicles.push_back(rv);
	return NULL;
}

/**
 * Rebuild, from scratch, the vehicles and other metadata on this stop.
 * @param rs   the roadstop this entry is part of
 * @param side the side of the road stop to look at
 */
void RoadStop::Entry::Rebuild(const RoadStop *rs, int side)
{
	assert(HasBit(rs->status, RSSFB_BASE_ENTRY));

	DiagDirection dir = GetRoadStopDir(rs->xy);
	if (side == -1) side = (rs->east == this);

	RoadStopEntryRebuilderHelper rserh;
	rserh.dir = side ? dir : ReverseDiagDir(dir);

	this->length = 0;
	TileIndexDiff offset = abs(TileOffsByDiagDir(dir));
	for (TileIndex tile = rs->xy; IsDriveThroughRoadStopContinuation(rs->xy, tile); tile += offset) {
		this->length += TILE_SIZE;
		FindVehicleOnPos(tile, &rserh, FindVehiclesInRoadStop);
	}

	this->occupied = 0;
	for (RVList::iterator it = rserh.vehicles.begin(); it != rserh.vehicles.end(); it++) {
		this->occupied += (*it)->rcache.cached_veh_length;
	}
}


/**
 * Check the integrity of the data in this struct.
 * @param rs the roadstop this entry is part of
 */
void RoadStop::Entry::CheckIntegrity(const RoadStop *rs) const
{
	if (!HasBit(rs->status, RSSFB_BASE_ENTRY)) return;

	/* The tile 'before' the road stop must not be part of this 'line' */
	assert(!IsDriveThroughRoadStopContinuation(rs->xy, rs->xy - abs(TileOffsByDiagDir(GetRoadStopDir(rs->xy)))));

	Entry temp;
	temp.Rebuild(rs, rs->east == this);
	if (temp.length != this->length || temp.occupied != this->occupied) NOT_REACHED();
}


void InitializeRoadStops()
{
	_roadstop_pool.CleanPool();
}