summaryrefslogtreecommitdiff
path: root/src/airport.cpp
blob: d0b810a1dcb8621c24c23ebcb4c93f782feba2c7 (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
395
396
397
398
399
400
401
402
403
404
405
406
/* $Id$ */

/*
 * 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 airport.cpp Functions related to airports. */

#include "stdafx.h"
#include "debug.h"
#include "airport.h"
#include "map_type.h"
#include "table/airport_movement.h"
#include "core/alloc_func.hpp"
#include "date_func.h"
#include "settings_type.h"
#include "newgrf_airport.h"
#include "station_base.h"
#include "table/strings.h"
#include "table/airporttile_ids.h"

/* Uncomment this to print out a full report of the airport-structure
 * You should either use
 * - true: full-report, print out every state and choice with string-names
 * OR
 * - false: give a summarized report which only shows current and next position */
//#define DEBUG_AIRPORT false

static AirportFTAClass _airportfta_dummy(
		_airport_moving_data_dummy,
		NULL,
		NULL,
		_airport_entries_dummy,
		AirportFTAClass::ALL,
		_airport_fta_dummy,
		0
	);

static AirportFTAClass _airportfta_country(
		_airport_moving_data_country,
		_airport_terminal_country,
		NULL,
		_airport_entries_country,
		AirportFTAClass::ALL | AirportFTAClass::SHORT_STRIP,
		_airport_fta_country,
		0
	);

static AirportFTAClass _airportfta_city(
		_airport_moving_data_town,
		_airport_terminal_city,
		NULL,
		_airport_entries_city,
		AirportFTAClass::ALL,
		_airport_fta_city,
		0
	);

static AirportFTAClass _airportfta_oilrig(
		_airport_moving_data_oilrig,
		NULL,
		_airport_helipad_heliport_oilrig,
		_airport_entries_heliport_oilrig,
		AirportFTAClass::HELICOPTERS,
		_airport_fta_heliport_oilrig,
		54
	);

static AirportFTAClass _airportfta_heliport(
		_airport_moving_data_heliport,
		NULL,
		_airport_helipad_heliport_oilrig,
		_airport_entries_heliport_oilrig,
		AirportFTAClass::HELICOPTERS,
		_airport_fta_heliport_oilrig,
		60
	);

static AirportFTAClass _airportfta_metropolitan(
		_airport_moving_data_metropolitan,
		_airport_terminal_metropolitan,
		NULL,
		_airport_entries_metropolitan,
		AirportFTAClass::ALL,
		_airport_fta_metropolitan,
		0
	);

static AirportFTAClass _airportfta_international(
		_airport_moving_data_international,
		_airport_terminal_international,
		_airport_helipad_international,
		_airport_entries_international,
		AirportFTAClass::ALL,
		_airport_fta_international,
		0
	);

static AirportFTAClass _airportfta_commuter(
		_airport_moving_data_commuter,
		_airport_terminal_commuter,
		_airport_helipad_commuter,
		_airport_entries_commuter,
		AirportFTAClass::ALL | AirportFTAClass::SHORT_STRIP,
		_airport_fta_commuter,
		0
	);

static AirportFTAClass _airportfta_helidepot(
		_airport_moving_data_helidepot,
		NULL,
		_airport_helipad_helidepot,
		_airport_entries_helidepot,
		AirportFTAClass::HELICOPTERS,
		_airport_fta_helidepot,
		0
	);

static AirportFTAClass _airportfta_intercontinental(
		_airport_moving_data_intercontinental,
		_airport_terminal_intercontinental,
		_airport_helipad_intercontinental,
		_airport_entries_intercontinental,
		AirportFTAClass::ALL,
		_airport_fta_intercontinental,
		0
	);

static AirportFTAClass _airportfta_helistation(
		_airport_moving_data_helistation,
		NULL,
		_airport_helipad_helistation,
		_airport_entries_helistation,
		AirportFTAClass::HELICOPTERS,
		_airport_fta_helistation,
		0
	);

#include "table/airport_defaults.h"


static uint16 AirportGetNofElements(const AirportFTAbuildup *apFA);
static AirportFTA *AirportBuildAutomata(uint nofelements, const AirportFTAbuildup *apFA);
static byte AirportGetTerminalCount(const byte *terminals, byte *groups);
static byte AirportTestFTA(uint nofelements, const AirportFTA *layout, const byte *terminals);

#ifdef DEBUG_AIRPORT
static void AirportPrintOut(uint nofelements, const AirportFTA *layout, bool full_report);
#endif


AirportFTAClass::AirportFTAClass(
	const AirportMovingData *moving_data_,
	const byte *terminals_,
	const byte *helipads_,
	const byte *entry_points_,
	Flags flags_,
	const AirportFTAbuildup *apFA,
	byte delta_z_
) :
	moving_data(moving_data_),
	terminals(terminals_),
	helipads(helipads_),
	flags(flags_),
	nofelements(AirportGetNofElements(apFA)),
	entry_points(entry_points_),
	delta_z(delta_z_)
{
	byte nofterminalgroups, nofhelipadgroups;

	/* Set up the terminal and helipad count for an airport.
	 * TODO: If there are more than 10 terminals or 4 helipads, internal variables
	 * need to be changed, so don't allow that for now */
	uint nofterminals = AirportGetTerminalCount(terminals, &nofterminalgroups);
	if (nofterminals > MAX_TERMINALS) {
		DEBUG(misc, 0, "[Ap] only a maximum of %d terminals are supported (requested %d)", MAX_TERMINALS, nofterminals);
		assert(nofterminals <= MAX_TERMINALS);
	}

	uint nofhelipads = AirportGetTerminalCount(helipads, &nofhelipadgroups);
	if (nofhelipads > MAX_HELIPADS) {
		DEBUG(misc, 0, "[Ap] only a maximum of %d helipads are supported (requested %d)", MAX_HELIPADS, nofhelipads);
		assert(nofhelipads <= MAX_HELIPADS);
	}

	/* Get the number of elements from the source table. We also double check this
	 * with the entry point which must be within bounds and use this information
	 * later on to build and validate the state machine */
	for (DiagDirection i = DIAGDIR_BEGIN; i < DIAGDIR_END; i++) {
		if (entry_points[i] >= nofelements) {
			DEBUG(misc, 0, "[Ap] entry (%d) must be within the airport (maximum %d)", entry_points[i], nofelements);
			assert(entry_points[i] < nofelements);
		}
	}

	/* Build the state machine itself */
	layout = AirportBuildAutomata(nofelements, apFA);
	DEBUG(misc, 6, "[Ap] #count %3d; #term %2d (%dgrp); #helipad %2d (%dgrp); entries %3d, %3d, %3d, %3d",
		nofelements, nofterminals, nofterminalgroups, nofhelipads, nofhelipadgroups,
		entry_points[DIAGDIR_NE], entry_points[DIAGDIR_SE], entry_points[DIAGDIR_SW], entry_points[DIAGDIR_NW]);

	/* Test if everything went allright. This is only a rude static test checking
	 * the symantic correctness. By no means does passing the test mean that the
	 * airport is working correctly or will not deadlock for example */
	uint ret = AirportTestFTA(nofelements, layout, terminals);
	if (ret != MAX_ELEMENTS) DEBUG(misc, 0, "[Ap] problem with element: %d", ret - 1);
	assert(ret == MAX_ELEMENTS);

#ifdef DEBUG_AIRPORT
	AirportPrintOut(nofelements, layout, DEBUG_AIRPORT);
#endif
}

AirportFTAClass::~AirportFTAClass()
{
	for (uint i = 0; i < nofelements; i++) {
		AirportFTA *current = layout[i].next;
		while (current != NULL) {
			AirportFTA *next = current->next;
			free(current);
			current = next;
		};
	}
	free(layout);
}

/** Get the number of elements of a source Airport state automata
 * Since it is actually just a big array of AirportFTA types, we only
 * know one element from the other by differing 'position' identifiers */
static uint16 AirportGetNofElements(const AirportFTAbuildup *apFA)
{
	uint16 nofelements = 0;
	int temp = apFA[0].position;

	for (uint i = 0; i < MAX_ELEMENTS; i++) {
		if (temp != apFA[i].position) {
			nofelements++;
			temp = apFA[i].position;
		}
		if (apFA[i].position == MAX_ELEMENTS) break;
	}
	return nofelements;
}

/** We calculate the terminal/helipod count based on the data passed to us
 * This data (terminals) contains an index as a first element as to how many
 * groups there are, and then the number of terminals for each group */
static byte AirportGetTerminalCount(const byte *terminals, byte *groups)
{
	byte nof_terminals = 0;
	*groups = 0;

	if (terminals != NULL) {
		uint i = terminals[0];
		*groups = i;
		while (i-- > 0) {
			terminals++;
			assert(*terminals != 0); // no empty groups please
			nof_terminals += *terminals;
		}
	}
	return nof_terminals;
}


static AirportFTA *AirportBuildAutomata(uint nofelements, const AirportFTAbuildup *apFA)
{
	AirportFTA *FAutomata = MallocT<AirportFTA>(nofelements);
	uint16 internalcounter = 0;

	for (uint i = 0; i < nofelements; i++) {
		AirportFTA *current = &FAutomata[i];
		current->position      = apFA[internalcounter].position;
		current->heading       = apFA[internalcounter].heading;
		current->block         = apFA[internalcounter].block;
		current->next_position = apFA[internalcounter].next;

		/* outgoing nodes from the same position, create linked list */
		while (current->position == apFA[internalcounter + 1].position) {
			AirportFTA *newNode = MallocT<AirportFTA>(1);

			newNode->position      = apFA[internalcounter + 1].position;
			newNode->heading       = apFA[internalcounter + 1].heading;
			newNode->block         = apFA[internalcounter + 1].block;
			newNode->next_position = apFA[internalcounter + 1].next;
			/* create link */
			current->next = newNode;
			current = current->next;
			internalcounter++;
		}
		current->next = NULL;
		internalcounter++;
	}
	return FAutomata;
}


static byte AirportTestFTA(uint nofelements, const AirportFTA *layout, const byte *terminals)
{
	uint next_position = 0;

	for (uint i = 0; i < nofelements; i++) {
		uint position = layout[i].position;
		if (position != next_position) return i;
		const AirportFTA *first = &layout[i];

		for (const AirportFTA *current = first; current != NULL; current = current->next) {
			/* A heading must always be valid. The only exceptions are
			 * - multiple choices as start, identified by a special value of 255
			 * - terminal group which is identified by a special value of 255 */
			if (current->heading > MAX_HEADINGS) {
				if (current->heading != 255) return i;
				if (current == first && current->next == NULL) return i;
				if (current != first && current->next_position > terminals[0]) return i;
			}

			/* If there is only one choice, it must be at the end */
			if (current->heading == 0 && current->next != NULL) return i;
			/* Obviously the elements of the linked list must have the same identifier */
			if (position != current->position) return i;
			/* A next position must be within bounds */
			if (current->next_position >= nofelements) return i;
		}
		next_position++;
	}
	return MAX_ELEMENTS;
}

#ifdef DEBUG_AIRPORT
static const char * const _airport_heading_strings[] = {
	"TO_ALL",
	"HANGAR",
	"TERM1",
	"TERM2",
	"TERM3",
	"TERM4",
	"TERM5",
	"TERM6",
	"HELIPAD1",
	"HELIPAD2",
	"TAKEOFF",
	"STARTTAKEOFF",
	"ENDTAKEOFF",
	"HELITAKEOFF",
	"FLYING",
	"LANDING",
	"ENDLANDING",
	"HELILANDING",
	"HELIENDLANDING",
	"TERM7",
	"TERM8",
	"HELIPAD3",
	"HELIPAD4",
	"DUMMY" // extra heading for 255
};

static void AirportPrintOut(uint nofelements, const AirportFTA *layout, bool full_report)
{
	if (!full_report) printf("(P = Current Position; NP = Next Position)\n");

	for (uint i = 0; i < nofelements; i++) {
		for (const AirportFTA *current = &layout[i]; current != NULL; current = current->next) {
			if (full_report) {
				byte heading = (current->heading == 255) ? MAX_HEADINGS + 1 : current->heading;
				printf("\tPos:%2d NPos:%2d Heading:%15s Block:%2d\n", current->position,
					    current->next_position, _airport_heading_strings[heading],
							FindLastBit(current->block));
			} else {
				printf("P:%2d NP:%2d", current->position, current->next_position);
			}
		}
		printf("\n");
	}
}
#endif

const AirportFTAClass *GetAirport(const byte airport_type)
{
	if (airport_type == AT_DUMMY) return &_airportfta_dummy;
	return AirportSpec::Get(airport_type)->fsm;
}

/**
 * Get the vehicle position when an aircraft is build at the given tile
 * @param hangar_tile The tile on which the vehicle is build
 * @return The position (index in airport node array) where the aircraft ends up
 */
byte GetVehiclePosOnBuild(TileIndex hangar_tile)
{
	const Station *st = Station::GetByTile(hangar_tile);
	const AirportFTAClass *apc = st->airport.GetFTA();
	/* When we click on hangar we know the tile it is on. By that we know
	 * its position in the array of depots the airport has.....we can search
	 * layout for #th position of depot. Since layout must start with a listing
	 * of all depots, it is simple */
	for (uint i = 0;; i++) {
		if (st->GetHangarTile(i) == hangar_tile) {
			assert(apc->layout[i].heading == HANGAR);
			return apc->layout[i].position;
		}
	}
	NOT_REACHED();
}