summaryrefslogtreecommitdiff
path: root/src/table/elrail_data.h
blob: 5b006d07890505c75114df581430cdf493f9aab0 (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
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
/* $Id$ */

/** @file elrail_data.h Stores all the data for overhead wire and pylon drawing.
 *  @see elrail.c */

#ifndef ELRAIL_DATA_H
#define ELRAIL_DATA_H

/** Tile Location group.
 * This defines whether the X and or Y coordinate of a tile is even */
enum TLG {
	XEVEN_YEVEN = 0,
	XEVEN_YODD  = 1,
	XODD_YEVEN  = 2,
	XODD_YODD   = 3,
	TLG_END
};

/** When determining the pylon configuration on the edge, two tiles are taken
 * into account: the tile being drawn itself (the home tile, the one in
 * ti->tile), and the neighbouring tile */
enum TileSource {
	TS_HOME      = 0,
	TS_NEIGHBOUR = 1,

	TS_END
};

enum {
	NUM_TRACKS_AT_PCP = 6
};

/** Which PPPs are possible at all on a given PCP */
static byte AllowedPPPonPCP[DIAGDIR_END] = {
	1 << DIR_N | 1 << DIR_E  | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W  | 1 << DIR_NW,
	1 << DIR_N | 1 << DIR_NE | 1 << DIR_E  | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
	1 << DIR_N | 1 << DIR_E  | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W  | 1 << DIR_NW,
	1 << DIR_N | 1 << DIR_NE | 1 << DIR_E  | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
};

/** Which of the PPPs are inside the tile. For the two PPPs on the tile border
 * the following system is used: if you rotate the PCP so that it is in the
 * north, the eastern PPP belongs to the tile. */
static byte OwnedPPPonPCP[DIAGDIR_END] = {
	1 << DIR_SE | 1 << DIR_S  | 1 << DIR_SW | 1 << DIR_W,
	1 << DIR_N  | 1 << DIR_SW | 1 << DIR_W  | 1 << DIR_NW,
	1 << DIR_N  | 1 << DIR_NE | 1 << DIR_E  | 1 << DIR_NW,
	1 << DIR_NE | 1 << DIR_E  | 1 << DIR_SE | 1 << DIR_S
};

/** Maps a track bit onto two PCP positions */
static const DiagDirection PCPpositions[TRACK_END][2] = {
	{DIAGDIR_NE, DIAGDIR_SW}, // X
	{DIAGDIR_SE, DIAGDIR_NW}, // Y
	{DIAGDIR_NW, DIAGDIR_NE}, // UPPER
	{DIAGDIR_SE, DIAGDIR_SW}, // LOWER
	{DIAGDIR_SW, DIAGDIR_NW}, // LEFT
	{DIAGDIR_NE, DIAGDIR_SE}, // RIGHT
};

#define PCP_NOT_ON_TRACK 0xFF
/** Preferred points of each trackbit. Those are the ones perpendicular to the
 * track, plus the point in extension of the track (to mark end-of-track). PCPs
 * which are not on either end of the track are fully preferred.
 * @see PCPpositions */
static byte PreferredPPPofTrackAtPCP[TRACK_END][DIAGDIR_END] = {
	{    // X
		1 << DIR_NE | 1 << DIR_SE | 1 << DIR_NW, // NE
		PCP_NOT_ON_TRACK,                        // SE
		1 << DIR_SE | 1 << DIR_SW | 1 << DIR_NW, // SW
		PCP_NOT_ON_TRACK                         // NE
	}, { // Y
		PCP_NOT_ON_TRACK,
		1 << DIR_NE | 1 << DIR_SE | 1 << DIR_SW,
		PCP_NOT_ON_TRACK,
		1 << DIR_SW | 1 << DIR_NW | 1 << DIR_NE
	}, { // UPPER
		1 << DIR_E | 1 << DIR_N | 1 << DIR_S,
		PCP_NOT_ON_TRACK,
		PCP_NOT_ON_TRACK,
		1 << DIR_W | 1 << DIR_N | 1 << DIR_S
	}, { // LOWER
		PCP_NOT_ON_TRACK,
		1 << DIR_E | 1 << DIR_N | 1 << DIR_S,
		1 << DIR_W | 1 << DIR_N | 1 << DIR_S,
		PCP_NOT_ON_TRACK
	}, { // LEFT
		PCP_NOT_ON_TRACK,
		PCP_NOT_ON_TRACK,
		1 << DIR_S | 1 << DIR_E | 1 << DIR_W,
		1 << DIR_N | 1 << DIR_E | 1 << DIR_W
	}, { // RIGHT
		1 << DIR_N | 1 << DIR_E | 1 << DIR_W,
		1 << DIR_S | 1 << DIR_E | 1 << DIR_W,
		PCP_NOT_ON_TRACK,
		PCP_NOT_ON_TRACK
	}
};
#undef PCP_NOT_ON_TRACK


#define NUM_IGNORE_GROUPS 3
#define IGNORE_NONE 0xFF
/** In case we have a staight line, we place pylon only every two tiles,
 * so there are certain tiles which we ignore. A straight line is found if
 * we have exactly two PPPs. */
static byte IgnoredPCP[NUM_IGNORE_GROUPS][TLG_END][DIAGDIR_END] = {
	{   // Ignore group 1, X and Y tracks
		{     // X even, Y even
			IGNORE_NONE,
			1 << DIR_NE | 1 << DIR_SW,
			1 << DIR_NW | 1 << DIR_SE,
			IGNORE_NONE
		}, { // X even, Y odd
			IGNORE_NONE,
			IGNORE_NONE,
			1 << DIR_NW | 1 << DIR_SE,
			1 << DIR_NE | 1 << DIR_SW
		}, { // X odd,  Y even
			1 << DIR_NW | 1 << DIR_SE,
			1 << DIR_NE | 1 << DIR_SW,
			IGNORE_NONE,
			IGNORE_NONE
		}, { // X odd,  Y odd
			1 << DIR_NW | 1 << DIR_SE,
			IGNORE_NONE,
			IGNORE_NONE,
			1 << DIR_NE | 1 << DIR_SW
		}
	},
	{   // Ignore group 2, LEFT and RIGHT tracks
		{
			1 << DIR_E | 1 << DIR_W,
			IGNORE_NONE,
			IGNORE_NONE,
			1 << DIR_E | 1 << DIR_W
		}, {
			IGNORE_NONE,
			1 << DIR_E | 1 << DIR_W,
			1 << DIR_E | 1 << DIR_W,
			IGNORE_NONE
		}, {
			IGNORE_NONE,
			1 << DIR_E | 1 << DIR_W,
			1 << DIR_E | 1 << DIR_W,
			IGNORE_NONE
		}, {
			1 << DIR_E | 1 << DIR_W,
			IGNORE_NONE,
			IGNORE_NONE,
			1 << DIR_E | 1 << DIR_W
		}
	},
	{   // Ignore group 3, UPPER and LOWER tracks
		{
			1 << DIR_N | 1 << DIR_S,
			1 << DIR_N | 1 << DIR_S,
			IGNORE_NONE,
			IGNORE_NONE
		}, {
			IGNORE_NONE,
			IGNORE_NONE,
			1 << DIR_N | 1 << DIR_S,
			1 << DIR_N | 1 << DIR_S
		}, {
			IGNORE_NONE,
			IGNORE_NONE,
			1 << DIR_N | 1 << DIR_S ,
			1 << DIR_N | 1 << DIR_S
		}, {
			1 << DIR_N | 1 << DIR_S,
			1 << DIR_N | 1 << DIR_S,
			IGNORE_NONE,
			IGNORE_NONE
		}
	}
};

#undef NO_IGNORE

/** Which pylons can definately NOT be built */
static byte DisallowedPPPofTrackAtPCP[TRACK_END][DIAGDIR_END] = {
	{1 << DIR_SW | 1 << DIR_NE, 0,           1 << DIR_SW | 1 << DIR_NE, 0          }, // X
	{0,           1 << DIR_NW | 1 << DIR_SE, 0,           1 << DIR_NW | 1 << DIR_SE}, // Y
	{1 << DIR_W | 1 << DIR_E,  0,           0,           1 << DIR_W | 1 << DIR_E }, // UPPER
	{0,           1 << DIR_W | 1 << DIR_E,  1 << DIR_W | 1 << DIR_E,  0          }, // LOWER
	{0,           0,           1 << DIR_S | 1 << DIR_N,  1 << DIR_N | 1 << DIR_S }, // LEFT
	{1 << DIR_S | 1 << DIR_N,  1 << DIR_S | 1 << DIR_N,  0,           0,         }, // RIGHT
};

/* This array stores which track bits can meet at a tile edge */
static const Track TracksAtPCP[DIAGDIR_END][NUM_TRACKS_AT_PCP] = {
	{TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
	{TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
	{TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
	{TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
};

/* takes each of the 6 track bits from the array above and
 * assigns it to the home tile or neighbour tile */
static const TileSource TrackSourceTile[DIAGDIR_END][NUM_TRACKS_AT_PCP] = {
	{TS_HOME, TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME     },
	{TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR, TS_HOME     },
	{TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME     , TS_HOME     , TS_NEIGHBOUR},
	{TS_HOME, TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR},
};

/* Several PPPs maybe exist, here they are sorted in order of preference. */
static const Direction PPPorder[DIAGDIR_END][TLG_END][DIR_END] = {    //  X  -  Y
	{   // PCP 0
		{DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_E, DIR_S, DIR_W}, // evn - evn
		{DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, // evn - odd
		{DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_W, DIR_N, DIR_E}, // odd - evn
		{DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, // odd - odd
	}, {// PCP 1
		{DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_E, DIR_N, DIR_W}, // evn - evn
		{DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, // evn - odd
		{DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_W, DIR_S, DIR_E}, // odd - evn
		{DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, // odd - odd
	}, {// PCP 2
		{DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_W, DIR_N, DIR_E}, // evn - evn
		{DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, // evn - odd
		{DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_E, DIR_S, DIR_W}, // odd - evn
		{DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, // odd - odd
	}, {// PCP 3
		{DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_W, DIR_S, DIR_E}, // evn - evn
		{DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, // evn - odd
		{DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_E, DIR_N, DIR_W}, // odd - evn
		{DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, // odd - odd
	}
};
/* Geometric placement of the PCP relative to the tile origin */
static const int8 x_pcp_offsets[DIAGDIR_END] = {0,  8, 16, 8};
static const int8 y_pcp_offsets[DIAGDIR_END] = {8, 16,  8, 0};
/* Geometric placement of the PPP relative to the PCP*/
static const int8 x_ppp_offsets[DIR_END] = {-2, -4, -2,  0,  2,  4,  2,  0};
static const int8 y_ppp_offsets[DIR_END] = {-2,  0,  2,  4,  2,  0, -2, -4};

/**
 * Offset for pylon sprites from the base pylon sprite.
 */
enum PylonSpriteOffset {
	PSO_Y_NE,
	PSO_Y_SW,
	PSO_X_NW,
	PSO_X_SE,
	PSO_EW_N,
	PSO_EW_S,
	PSO_NS_W,
	PSO_NS_E,
};

/* The type of pylon to draw at each PPP */
static const uint8 pylon_sprites[] = {
	PSO_EW_N,
	PSO_Y_NE,
	PSO_NS_E,
	PSO_X_SE,
	PSO_EW_S,
	PSO_Y_SW,
	PSO_NS_W,
	PSO_X_NW,
};

/**
 * Offset for wire sprites from the base wire sprite.
 */
enum WireSpriteOffset {
	WSO_X_SHORT,
	WSO_Y_SHORT,
	WSO_EW_SHORT,
	WSO_NS_SHORT,
	WSO_X_SHORT_DOWN,
	WSO_Y_SHORT_UP,
	WSO_X_SHORT_UP,
	WSO_Y_SHORT_DOWN,

	WSO_X_SW,
	WSO_Y_SE,
	WSO_EW_E,
	WSO_NS_S,
	WSO_X_SW_DOWN,
	WSO_Y_SE_UP,
	WSO_X_SW_UP,
	WSO_Y_SE_DOWN,

	WSO_X_NE,
	WSO_Y_NW,
	WSO_EW_W,
	WSO_NS_N,
	WSO_X_NE_DOWN,
	WSO_Y_NW_UP,
	WSO_X_NE_UP,
	WSO_Y_NW_DOWN,

	WSO_ENTRANCE_NE,
	WSO_ENTRANCE_SE,
	WSO_ENTRANCE_SW,
	WSO_ENTRANCE_NW,
};

struct SortableSpriteStruct {
	uint8 image_offset;
	int8 x_offset;
	int8 y_offset;
	int8 x_size;
	int8 y_size;
	int8 z_size;
	int8 z_offset;
};

enum {
	/** Distance between wire and rail */
	ELRAIL_ELEVATION = 10,
	/** Wires that a draw one level higher than the north corner. */
	ELRAIL_ELEVRAISE = ELRAIL_ELEVATION + TILE_HEIGHT
};

static const SortableSpriteStruct CatenarySpriteData[] = {
/* X direction
	 * Flat tiles:
		 * Wires */
	{ WSO_X_SW,          0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! 0: Wire in X direction, pylon on the SW end only
	{ WSO_X_NE,          0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! 1: Wire in X direction, pylon on the NE end
	{ WSO_X_SHORT,       0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! 2: Wire in X direction, pylon on both ends

	/* "up" tiles
		 * Wires */
	{ WSO_X_SW_UP,       0,  7, 15,  8,  1, ELRAIL_ELEVRAISE }, //! 3: Wire in X pitch up, pylon on the SW end only
	{ WSO_X_NE_UP,       0,  7, 15,  8,  1, ELRAIL_ELEVRAISE }, //! 4: Wire in X pitch up, pylon on the NE end
	{ WSO_X_SHORT_UP,    0,  7, 15,  8,  1, ELRAIL_ELEVRAISE }, //! 5: Wire in X pitch up, pylon on both ends

	/* "down" tiles
		 * Wires */
	{ WSO_X_SW_DOWN,     0,  7, 15,  8,  1, ELRAIL_ELEVATION }, //! 6: Wire in X pitch down, pylon on the SW end
	{ WSO_X_NE_DOWN,     0,  7, 15,  8,  1, ELRAIL_ELEVATION }, //! 7: Wire in X pitch down, pylon on the NE end
	{ WSO_X_SHORT_DOWN,  0,  7, 15,  8,  1, ELRAIL_ELEVATION }, //! 8: Wire in X pitch down, pylon on both ends


/* Y direction
	 * Flat tiles:
		 * Wires */
	{ WSO_Y_SE,          7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //! 9: Wire in Y direction, pylon on the SE end only
	{ WSO_Y_NW,          7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //!10: Wire in Y direction, pylon on the NW end
	{ WSO_Y_SHORT,       7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //!11: Wire in Y direction, pylon on both ends

	/* "up" tiles
		 * Wires */
	{ WSO_Y_SE_UP,       7,  0,  8, 15,  1, ELRAIL_ELEVRAISE }, //!12: Wire in Y pitch up, pylon on the SE end only
	{ WSO_Y_NW_UP,       7,  0,  8, 15,  1, ELRAIL_ELEVRAISE }, //!13: Wire in Y pitch up, pylon on the NW end
	{ WSO_Y_SHORT_UP,    7,  0,  8, 15,  1, ELRAIL_ELEVRAISE }, //!14: Wire in Y pitch up, pylon on both ends

	/* "down" tiles
		 * Wires */
	{ WSO_Y_SE_DOWN,     7,  0,  8, 15,  1, ELRAIL_ELEVATION }, //!15: Wire in Y pitch down, pylon on the SE end
	{ WSO_Y_NW_DOWN,     7,  0,  8, 15,  1, ELRAIL_ELEVATION }, //!16: Wire in Y pitch down, pylon on the NW end
	{ WSO_Y_SHORT_DOWN,  7,  0,  8, 15,  1, ELRAIL_ELEVATION }, //!17: Wire in Y pitch down, pylon on both ends

/* NS Direction */
	{ WSO_NS_SHORT,      8,  0,  8,  8,  1, ELRAIL_ELEVATION }, //!18: LEFT  trackbit wire, pylon on both ends
	{ WSO_NS_SHORT,      0,  8,  8,  8,  1, ELRAIL_ELEVATION }, //!19: RIGHT trackbit wire, pylon on both ends

	{ WSO_NS_N,          8,  0,  8,  8,  1, ELRAIL_ELEVATION }, //!20: LEFT  trackbit wire, pylon on N end
	{ WSO_NS_N,          0,  8,  8,  8,  1, ELRAIL_ELEVATION }, //!21: RIGHT trackbit wire, pylon on N end

	{ WSO_NS_S,          8,  0,  8,  8,  1, ELRAIL_ELEVATION }, //!22: LEFT  trackbit wire, pylon on S end
	{ WSO_NS_S,          0,  8,  8,  8,  1, ELRAIL_ELEVATION }, //!23: RIGHT trackbit wire, pylon on S end

/* EW Direction */
	{ WSO_EW_SHORT,      7,  0,  1,  1,  1, ELRAIL_ELEVATION }, //!24: UPPER trackbit wire, pylon on both ends
	{ WSO_EW_SHORT,     15,  8,  3,  3,  1, ELRAIL_ELEVATION }, //!25: LOWER trackbit wire, pylon on both ends

	{ WSO_EW_W,          7,  0,  1,  1,  1, ELRAIL_ELEVATION }, //!28: UPPER trackbit wire, pylon on both ends
	{ WSO_EW_W,         15,  8,  3,  3,  1, ELRAIL_ELEVATION }, //!29: LOWER trackbit wire, pylon on both ends

	{ WSO_EW_E,          7,  0,  1,  1,  1, ELRAIL_ELEVATION }, //!32: UPPER trackbit wire, pylon on both ends
	{ WSO_EW_E,         15,  8,  3,  3,  1, ELRAIL_ELEVATION }  //!33: LOWER trackbit wire, pylon on both ends
};

static const SortableSpriteStruct CatenarySpriteData_Depot[] = {
	{ WSO_ENTRANCE_NE,   0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! Wire for NE depot exit
	{ WSO_ENTRANCE_SE,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //! Wire for SE depot exit
	{ WSO_ENTRANCE_SW,   0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! Wire for SW depot exit
	{ WSO_ENTRANCE_NW,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }  //! Wire for NW depot exit
};

static const SortableSpriteStruct CatenarySpriteData_Tunnel[] = {
	{ WSO_ENTRANCE_NE,   0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! Wire for NE tunnel exit
	{ WSO_ENTRANCE_SE,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //! Wire for SE tunnel exit
	{ WSO_ENTRANCE_SW,   0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! Wire for SW tunnel exit
	{ WSO_ENTRANCE_NW,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }  //! Wire for NW tunnel exit
};


/** Refers to a certain element of the catenary.
 * Identifiers for Wires:
 * <ol><li>Direction of the wire</li>
 * <li>Slope of the tile for diagonals, placement inside the track for horiz/vertical pieces</li>
 * <li>Place where a pylon shoule be</li></ol>
 * Identifiers for Pylons:
 * <ol><li>Direction of the wire</li>
 * <li>Slope of the tile</li>
 * <li>Position of the Pylon relative to the track</li>
 * <li>Position of the Pylon inside the tile</li></ol>
 */
enum CatenarySprite {
	WIRE_X_FLAT_SW,
	WIRE_X_FLAT_NE,
	WIRE_X_FLAT_BOTH,

	WIRE_X_UP_SW,
	WIRE_X_UP_NE,
	WIRE_X_UP_BOTH,

	WIRE_X_DOWN_SW,
	WIRE_X_DOWN_NE,
	WIRE_X_DOWN_BOTH,

	WIRE_Y_FLAT_SE,
	WIRE_Y_FLAT_NW,
	WIRE_Y_FLAT_BOTH,

	WIRE_Y_UP_SE,
	WIRE_Y_UP_NW,
	WIRE_Y_UP_BOTH,

	WIRE_Y_DOWN_SE,
	WIRE_Y_DOWN_NW,
	WIRE_Y_DOWN_BOTH,

	WIRE_NS_W_BOTH,
	WIRE_NS_E_BOTH,

	WIRE_NS_W_N,
	WIRE_NS_E_N,

	WIRE_NS_W_S,
	WIRE_NS_E_S,

	WIRE_EW_N_BOTH,
	WIRE_EW_S_BOTH,

	WIRE_EW_N_W,
	WIRE_EW_S_W,

	WIRE_EW_N_E,
	WIRE_EW_S_E,

	INVALID_CATENARY = 0xFF
};

/* Selects a Wire (with white and grey ends) depending on whether:
 * a) none (should never happen)
 * b) the first
 * c) the second
 * d) both
 * PCP exists.*/
static const CatenarySprite Wires[5][TRACK_END][4] = {
	{ // Tileh == 0
		{INVALID_CATENARY, WIRE_X_FLAT_NE,   WIRE_X_FLAT_SW,   WIRE_X_FLAT_BOTH},
		{INVALID_CATENARY, WIRE_Y_FLAT_SE,   WIRE_Y_FLAT_NW,   WIRE_Y_FLAT_BOTH},
		{INVALID_CATENARY, WIRE_EW_N_W,      WIRE_EW_N_E,      WIRE_EW_N_BOTH},
		{INVALID_CATENARY, WIRE_EW_S_E,      WIRE_EW_S_W,      WIRE_EW_S_BOTH},
		{INVALID_CATENARY, WIRE_NS_W_S,      WIRE_NS_W_N,      WIRE_NS_W_BOTH},
		{INVALID_CATENARY, WIRE_NS_E_N,      WIRE_NS_E_S,      WIRE_NS_E_BOTH},
	}, { // Tileh == 3
		{INVALID_CATENARY, WIRE_X_UP_NE,     WIRE_X_UP_SW,     WIRE_X_UP_BOTH},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
	}, { // Tileh == 6
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, WIRE_Y_UP_SE,     WIRE_Y_UP_NW,     WIRE_Y_UP_BOTH},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
	}, { // Tileh == 9
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, WIRE_Y_DOWN_SE,   WIRE_Y_DOWN_NW,   WIRE_Y_DOWN_BOTH},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
	}, { // Tileh == 12
		{INVALID_CATENARY, WIRE_X_DOWN_NE,   WIRE_X_DOWN_SW,   WIRE_X_DOWN_BOTH},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
		{INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
	}
};

#endif /* ELRAIL_DATA_H */