src/table/elrail_data.h

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /**
   9  * @file elrail_data.h Stores all the data for overhead wire and pylon drawing.
  10  *  @see elrail.c
  11  */
  12
  13 #ifndef ELRAIL_DATA_H
  14 #define ELRAIL_DATA_H
  15
  16 /**
  17  * Tile Location group.
  18  * This defines whether the X and or Y coordinate of a tile is even
  19  */
  20 enum TLG {
  21         XEVEN_YEVEN = 0,
  22         XEVEN_YODD  = 1,
  23         XODD_YEVEN  = 2,
  24         XODD_YODD   = 3,
  25         TLG_END
  26 };
  27
  28 /**
  29  * When determining the pylon configuration on the edge, two tiles are taken
  30  * into account: the tile being drawn itself (the home tile, the one in
  31  * ti->tile), and the neighbouring tile
  32  */
  33 enum TileSource {
  34         TS_HOME      = 0,
  35         TS_NEIGHBOUR = 1,
  36
  37         TS_END
  38 };
  39
  40 static const uint NUM_TRACKS_AT_PCP = 6;
  41
  42 /** Which PPPs are possible at all on a given PCP */
  43 static const byte AllowedPPPonPCP[DIAGDIR_END] = {
  44         1 << DIR_N | 1 << DIR_E  | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W  | 1 << DIR_NW,
  45         1 << DIR_N | 1 << DIR_NE | 1 << DIR_E  | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
  46         1 << DIR_N | 1 << DIR_E  | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W  | 1 << DIR_NW,
  47         1 << DIR_N | 1 << DIR_NE | 1 << DIR_E  | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
  48 };
  49
  50 /**
  51  * Which of the PPPs are inside the tile. For the two PPPs on the tile border
  52  * the following system is used: if you rotate the PCP so that it is in the
  53  * north, the eastern PPP belongs to the tile.
  54  */
  55 static const byte OwnedPPPonPCP[DIAGDIR_END] = {
  56         1 << DIR_SE | 1 << DIR_S  | 1 << DIR_SW | 1 << DIR_W,
  57         1 << DIR_N  | 1 << DIR_SW | 1 << DIR_W  | 1 << DIR_NW,
  58         1 << DIR_N  | 1 << DIR_NE | 1 << DIR_E  | 1 << DIR_NW,
  59         1 << DIR_NE | 1 << DIR_E  | 1 << DIR_SE | 1 << DIR_S
  60 };
  61
  62 /** Maps a track bit onto two PCP positions */
  63 static const DiagDirection PCPpositions[TRACK_END][2] = {
  64         {DIAGDIR_NE, DIAGDIR_SW}, // X
  65         {DIAGDIR_SE, DIAGDIR_NW}, // Y
  66         {DIAGDIR_NW, DIAGDIR_NE}, // UPPER
  67         {DIAGDIR_SE, DIAGDIR_SW}, // LOWER
  68         {DIAGDIR_SW, DIAGDIR_NW}, // LEFT
  69         {DIAGDIR_NE, DIAGDIR_SE}, // RIGHT
  70 };
  71
  72 #define PCP_NOT_ON_TRACK 0xFF
  73 /**
  74  * Preferred points of each trackbit. Those are the ones perpendicular to the
  75  * track, plus the point in extension of the track (to mark end-of-track). PCPs
  76  * which are not on either end of the track are fully preferred.
  77  * @see PCPpositions
  78  */
  79 static const byte PreferredPPPofTrackAtPCP[TRACK_END][DIAGDIR_END] = {
  80         {    // X
  81                 1 << DIR_NE | 1 << DIR_SE | 1 << DIR_NW, // NE
  82                 PCP_NOT_ON_TRACK,                        // SE
  83                 1 << DIR_SE | 1 << DIR_SW | 1 << DIR_NW, // SW
  84                 PCP_NOT_ON_TRACK                         // NE
  85         }, { // Y
  86                 PCP_NOT_ON_TRACK,
  87                 1 << DIR_NE | 1 << DIR_SE | 1 << DIR_SW,
  88                 PCP_NOT_ON_TRACK,
  89                 1 << DIR_SW | 1 << DIR_NW | 1 << DIR_NE
  90         }, { // UPPER
  91                 1 << DIR_E | 1 << DIR_N | 1 << DIR_S,
  92                 PCP_NOT_ON_TRACK,
  93                 PCP_NOT_ON_TRACK,
  94                 1 << DIR_W | 1 << DIR_N | 1 << DIR_S
  95         }, { // LOWER
  96                 PCP_NOT_ON_TRACK,
  97                 1 << DIR_E | 1 << DIR_N | 1 << DIR_S,
  98                 1 << DIR_W | 1 << DIR_N | 1 << DIR_S,
  99                 PCP_NOT_ON_TRACK
 100         }, { // LEFT
 101                 PCP_NOT_ON_TRACK,
 102                 PCP_NOT_ON_TRACK,
 103                 1 << DIR_S | 1 << DIR_E | 1 << DIR_W,
 104                 1 << DIR_N | 1 << DIR_E | 1 << DIR_W
 105         }, { // RIGHT
 106                 1 << DIR_N | 1 << DIR_E | 1 << DIR_W,
 107                 1 << DIR_S | 1 << DIR_E | 1 << DIR_W,
 108                 PCP_NOT_ON_TRACK,
 109                 PCP_NOT_ON_TRACK
 110         }
 111 };
 112 #undef PCP_NOT_ON_TRACK
 113
 114
 115 #define NUM_IGNORE_GROUPS 3
 116 #define IGNORE_NONE 0xFF
 117 /**
 118  * In case we have a straight line, we place pylon only every two tiles,
 119  * so there are certain tiles which we ignore. A straight line is found if
 120  * we have exactly two PPPs.
 121  */
 122 static const byte IgnoredPCP[NUM_IGNORE_GROUPS][TLG_END][DIAGDIR_END] = {
 123         {   // Ignore group 1, X and Y tracks
 124                 {     // X even, Y even
 125                         IGNORE_NONE,
 126                         1 << DIR_NE | 1 << DIR_SW,
 127                         1 << DIR_NW | 1 << DIR_SE,
 128                         IGNORE_NONE
 129                 }, { // X even, Y odd
 130                         IGNORE_NONE,
 131                         IGNORE_NONE,
 132                         1 << DIR_NW | 1 << DIR_SE,
 133                         1 << DIR_NE | 1 << DIR_SW
 134                 }, { // X odd,  Y even
 135                         1 << DIR_NW | 1 << DIR_SE,
 136                         1 << DIR_NE | 1 << DIR_SW,
 137                         IGNORE_NONE,
 138                         IGNORE_NONE
 139                 }, { // X odd,  Y odd
 140                         1 << DIR_NW | 1 << DIR_SE,
 141                         IGNORE_NONE,
 142                         IGNORE_NONE,
 143                         1 << DIR_NE | 1 << DIR_SW
 144                 }
 145         },
 146         {   // Ignore group 2, LEFT and RIGHT tracks
 147                 {
 148                         1 << DIR_E | 1 << DIR_W,
 149                         IGNORE_NONE,
 150                         IGNORE_NONE,
 151                         1 << DIR_E | 1 << DIR_W
 152                 }, {
 153                         IGNORE_NONE,
 154                         1 << DIR_E | 1 << DIR_W,
 155                         1 << DIR_E | 1 << DIR_W,
 156                         IGNORE_NONE
 157                 }, {
 158                         IGNORE_NONE,
 159                         1 << DIR_E | 1 << DIR_W,
 160                         1 << DIR_E | 1 << DIR_W,
 161                         IGNORE_NONE
 162                 }, {
 163                         1 << DIR_E | 1 << DIR_W,
 164                         IGNORE_NONE,
 165                         IGNORE_NONE,
 166                         1 << DIR_E | 1 << DIR_W
 167                 }
 168         },
 169         {   // Ignore group 3, UPPER and LOWER tracks
 170                 {
 171                         1 << DIR_N | 1 << DIR_S,
 172                         1 << DIR_N | 1 << DIR_S,
 173                         IGNORE_NONE,
 174                         IGNORE_NONE
 175                 }, {
 176                         IGNORE_NONE,
 177                         IGNORE_NONE,
 178                         1 << DIR_N | 1 << DIR_S,
 179                         1 << DIR_N | 1 << DIR_S
 180                 }, {
 181                         IGNORE_NONE,
 182                         IGNORE_NONE,
 183                         1 << DIR_N | 1 << DIR_S ,
 184                         1 << DIR_N | 1 << DIR_S
 185                 }, {
 186                         1 << DIR_N | 1 << DIR_S,
 187                         1 << DIR_N | 1 << DIR_S,
 188                         IGNORE_NONE,
 189                         IGNORE_NONE
 190                 }
 191         }
 192 };
 193
 194 #undef NO_IGNORE
 195
 196 /** Which pylons can definitely NOT be built */
 197 static const byte DisallowedPPPofTrackAtPCP[TRACK_END][DIAGDIR_END] = {
 198         {1 << DIR_SW | 1 << DIR_NE, 0,           1 << DIR_SW | 1 << DIR_NE, 0          }, // X
 199         {0,           1 << DIR_NW | 1 << DIR_SE, 0,           1 << DIR_NW | 1 << DIR_SE}, // Y
 200         {1 << DIR_W | 1 << DIR_E,  0,           0,           1 << DIR_W | 1 << DIR_E }, // UPPER
 201         {0,           1 << DIR_W | 1 << DIR_E,  1 << DIR_W | 1 << DIR_E,  0          }, // LOWER
 202         {0,           0,           1 << DIR_S | 1 << DIR_N,  1 << DIR_N | 1 << DIR_S }, // LEFT
 203         {1 << DIR_S | 1 << DIR_N,  1 << DIR_S | 1 << DIR_N,  0,           0,         }, // RIGHT
 204 };
 205
 206 /* This array stores which track bits can meet at a tile edge */
 207 static const Track TracksAtPCP[DIAGDIR_END][NUM_TRACKS_AT_PCP] = {
 208         {TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
 209         {TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
 210         {TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
 211         {TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
 212 };
 213
 214 /* takes each of the 6 track bits from the array above and
 215  * assigns it to the home tile or neighbour tile */
 216 static const TileSource TrackSourceTile[DIAGDIR_END][NUM_TRACKS_AT_PCP] = {
 217         {TS_HOME, TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME     },
 218         {TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR, TS_HOME     },
 219         {TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME     , TS_HOME     , TS_NEIGHBOUR},
 220         {TS_HOME, TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR},
 221 };
 222
 223 /* Several PPPs maybe exist, here they are sorted in order of preference. */
 224 static const Direction PPPorder[DIAGDIR_END][TLG_END][DIR_END] = {    //  X  -  Y
 225         {   // PCP 0
 226                 {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_E, DIR_S, DIR_W}, // evn - evn
 227                 {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, // evn - odd
 228                 {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_W, DIR_N, DIR_E}, // odd - evn
 229                 {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, // odd - odd
 230         }, {// PCP 1
 231                 {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_E, DIR_N, DIR_W}, // evn - evn
 232                 {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, // evn - odd
 233                 {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_W, DIR_S, DIR_E}, // odd - evn
 234                 {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, // odd - odd
 235         }, {// PCP 2
 236                 {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_W, DIR_N, DIR_E}, // evn - evn
 237                 {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, // evn - odd
 238                 {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_E, DIR_S, DIR_W}, // odd - evn
 239                 {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, // odd - odd
 240         }, {// PCP 3
 241                 {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_W, DIR_S, DIR_E}, // evn - evn
 242                 {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, // evn - odd
 243                 {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_E, DIR_N, DIR_W}, // odd - evn
 244                 {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, // odd - odd
 245         }
 246 };
 247 /* Geometric placement of the PCP relative to the tile origin */
 248 static const int8 x_pcp_offsets[DIAGDIR_END] = {0,  8, 16, 8};
 249 static const int8 y_pcp_offsets[DIAGDIR_END] = {8, 16,  8, 0};
 250 /* Geometric placement of the PPP relative to the PCP*/
 251 static const int8 x_ppp_offsets[DIR_END] = {-2, -4, -2,  0,  2,  4,  2,  0};
 252 static const int8 y_ppp_offsets[DIR_END] = {-2,  0,  2,  4,  2,  0, -2, -4};
 253
 254 /**
 255  * Offset for pylon sprites from the base pylon sprite.
 256  */
 257 enum PylonSpriteOffset {
 258         PSO_Y_NE,
 259         PSO_Y_SW,
 260         PSO_X_NW,
 261         PSO_X_SE,
 262         PSO_EW_N,
 263         PSO_EW_S,
 264         PSO_NS_W,
 265         PSO_NS_E,
 266 };
 267
 268 /* The type of pylon to draw at each PPP */
 269 static const uint8 pylon_sprites[] = {
 270         PSO_EW_N,
 271         PSO_Y_NE,
 272         PSO_NS_E,
 273         PSO_X_SE,
 274         PSO_EW_S,
 275         PSO_Y_SW,
 276         PSO_NS_W,
 277         PSO_X_NW,
 278 };
 279
 280 /**
 281  * Offset for wire sprites from the base wire sprite.
 282  */
 283 enum WireSpriteOffset {
 284         WSO_X_SHORT,
 285         WSO_Y_SHORT,
 286         WSO_EW_SHORT,
 287         WSO_NS_SHORT,
 288         WSO_X_SHORT_DOWN,
 289         WSO_Y_SHORT_UP,
 290         WSO_X_SHORT_UP,
 291         WSO_Y_SHORT_DOWN,
 292
 293         WSO_X_SW,
 294         WSO_Y_SE,
 295         WSO_EW_E,
 296         WSO_NS_S,
 297         WSO_X_SW_DOWN,
 298         WSO_Y_SE_UP,
 299         WSO_X_SW_UP,
 300         WSO_Y_SE_DOWN,
 301
 302         WSO_X_NE,
 303         WSO_Y_NW,
 304         WSO_EW_W,
 305         WSO_NS_N,
 306         WSO_X_NE_DOWN,
 307         WSO_Y_NW_UP,
 308         WSO_X_NE_UP,
 309         WSO_Y_NW_DOWN,
 310
 311         WSO_ENTRANCE_SW,
 312         WSO_ENTRANCE_NW,
 313         WSO_ENTRANCE_NE,
 314         WSO_ENTRANCE_SE,
 315 };
 316
 317 struct SortableSpriteStruct {
 318         uint8 image_offset;
 319         int8 x_offset;
 320         int8 y_offset;
 321         int8 x_size;
 322         int8 y_size;
 323         int8 z_size;
 324         int8 z_offset;
 325 };
 326
 327 /** Distance between wire and rail */
 328 static const uint ELRAIL_ELEVATION = 10;
 329 /** Wires that a draw one level higher than the north corner. */
 330 static const uint ELRAIL_ELEVRAISE = ELRAIL_ELEVATION + TILE_HEIGHT;
 331
 332 static const SortableSpriteStruct RailCatenarySpriteData[] = {
 333 /* X direction
 334          * Flat tiles:
 335                  * Wires */
 336         { WSO_X_SW,          0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! 0: Wire in X direction, pylon on the SW end only
 337         { WSO_X_NE,          0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! 1: Wire in X direction, pylon on the NE end
 338         { WSO_X_SHORT,       0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! 2: Wire in X direction, pylon on both ends
 339
 340         /* "up" tiles
 341                  * Wires */
 342         { WSO_X_SW_UP,       0,  7, 15,  8,  1, ELRAIL_ELEVRAISE }, //! 3: Wire in X pitch up, pylon on the SW end only
 343         { WSO_X_NE_UP,       0,  7, 15,  8,  1, ELRAIL_ELEVRAISE }, //! 4: Wire in X pitch up, pylon on the NE end
 344         { WSO_X_SHORT_UP,    0,  7, 15,  8,  1, ELRAIL_ELEVRAISE }, //! 5: Wire in X pitch up, pylon on both ends
 345
 346         /* "down" tiles
 347                  * Wires */
 348         { WSO_X_SW_DOWN,     0,  7, 15,  8,  1, ELRAIL_ELEVATION }, //! 6: Wire in X pitch down, pylon on the SW end
 349         { WSO_X_NE_DOWN,     0,  7, 15,  8,  1, ELRAIL_ELEVATION }, //! 7: Wire in X pitch down, pylon on the NE end
 350         { WSO_X_SHORT_DOWN,  0,  7, 15,  8,  1, ELRAIL_ELEVATION }, //! 8: Wire in X pitch down, pylon on both ends
 351
 352
 353 /* Y direction
 354          * Flat tiles:
 355                  * Wires */
 356         { WSO_Y_SE,          7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //! 9: Wire in Y direction, pylon on the SE end only
 357         { WSO_Y_NW,          7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //!10: Wire in Y direction, pylon on the NW end
 358         { WSO_Y_SHORT,       7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //!11: Wire in Y direction, pylon on both ends
 359
 360         /* "up" tiles
 361                  * Wires */
 362         { WSO_Y_SE_UP,       7,  0,  8, 15,  1, ELRAIL_ELEVRAISE }, //!12: Wire in Y pitch up, pylon on the SE end only
 363         { WSO_Y_NW_UP,       7,  0,  8, 15,  1, ELRAIL_ELEVRAISE }, //!13: Wire in Y pitch up, pylon on the NW end
 364         { WSO_Y_SHORT_UP,    7,  0,  8, 15,  1, ELRAIL_ELEVRAISE }, //!14: Wire in Y pitch up, pylon on both ends
 365
 366         /* "down" tiles
 367                  * Wires */
 368         { WSO_Y_SE_DOWN,     7,  0,  8, 15,  1, ELRAIL_ELEVATION }, //!15: Wire in Y pitch down, pylon on the SE end
 369         { WSO_Y_NW_DOWN,     7,  0,  8, 15,  1, ELRAIL_ELEVATION }, //!16: Wire in Y pitch down, pylon on the NW end
 370         { WSO_Y_SHORT_DOWN,  7,  0,  8, 15,  1, ELRAIL_ELEVATION }, //!17: Wire in Y pitch down, pylon on both ends
 371
 372 /* NS Direction */
 373         { WSO_NS_SHORT,      8,  0,  8,  8,  1, ELRAIL_ELEVATION }, //!18: LEFT  trackbit wire, pylon on both ends
 374         { WSO_NS_SHORT,      0,  8,  8,  8,  1, ELRAIL_ELEVATION }, //!19: RIGHT trackbit wire, pylon on both ends
 375
 376         { WSO_NS_N,          8,  0,  8,  8,  1, ELRAIL_ELEVATION }, //!20: LEFT  trackbit wire, pylon on N end
 377         { WSO_NS_N,          0,  8,  8,  8,  1, ELRAIL_ELEVATION }, //!21: RIGHT trackbit wire, pylon on N end
 378
 379         { WSO_NS_S,          8,  0,  8,  8,  1, ELRAIL_ELEVATION }, //!22: LEFT  trackbit wire, pylon on S end
 380         { WSO_NS_S,          0,  8,  8,  8,  1, ELRAIL_ELEVATION }, //!23: RIGHT trackbit wire, pylon on S end
 381
 382 /* EW Direction */
 383         { WSO_EW_SHORT,      7,  0,  1,  1,  1, ELRAIL_ELEVATION }, //!24: UPPER trackbit wire, pylon on both ends
 384         { WSO_EW_SHORT,     15,  8,  3,  3,  1, ELRAIL_ELEVATION }, //!25: LOWER trackbit wire, pylon on both ends
 385
 386         { WSO_EW_W,          7,  0,  1,  1,  1, ELRAIL_ELEVATION }, //!28: UPPER trackbit wire, pylon on both ends
 387         { WSO_EW_W,         15,  8,  3,  3,  1, ELRAIL_ELEVATION }, //!29: LOWER trackbit wire, pylon on both ends
 388
 389         { WSO_EW_E,          7,  0,  1,  1,  1, ELRAIL_ELEVATION }, //!32: UPPER trackbit wire, pylon on both ends
 390         { WSO_EW_E,         15,  8,  3,  3,  1, ELRAIL_ELEVATION }  //!33: LOWER trackbit wire, pylon on both ends
 391 };
 392
 393 static const SortableSpriteStruct RailCatenarySpriteData_Depot[] = {
 394         { WSO_ENTRANCE_NE,   0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! Wire for NE depot exit
 395         { WSO_ENTRANCE_SE,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //! Wire for SE depot exit
 396         { WSO_ENTRANCE_SW,   0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! Wire for SW depot exit
 397         { WSO_ENTRANCE_NW,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }  //! Wire for NW depot exit
 398 };
 399
 400 static const SortableSpriteStruct RailCatenarySpriteData_Tunnel[] = {
 401         { WSO_ENTRANCE_SW,   0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! Wire for NE tunnel (SW facing exit)
 402         { WSO_ENTRANCE_NW,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }, //! Wire for SE tunnel (NW facing exit)
 403         { WSO_ENTRANCE_NE,   0,  7, 15,  1,  1, ELRAIL_ELEVATION }, //! Wire for SW tunnel (NE facing exit)
 404         { WSO_ENTRANCE_SE,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }  //! Wire for NW tunnel (SE facing exit)
 405 };
 406
 407
 408 /**
 409  * Refers to a certain element of the catenary.
 410  * Identifiers for Wires:
 411  * <ol><li>Direction of the wire</li>
 412  * <li>Slope of the tile for diagonals, placement inside the track for horiz/vertical pieces</li>
 413  * <li>Place where a pylon should be</li></ol>
 414  * Identifiers for Pylons:
 415  * <ol><li>Direction of the wire</li>
 416  * <li>Slope of the tile</li>
 417  * <li>Position of the Pylon relative to the track</li>
 418  * <li>Position of the Pylon inside the tile</li></ol>
 419  */
 420 enum RailCatenarySprite {
 421         WIRE_X_FLAT_SW,
 422         WIRE_X_FLAT_NE,
 423         WIRE_X_FLAT_BOTH,
 424
 425         WIRE_X_UP_SW,
 426         WIRE_X_UP_NE,
 427         WIRE_X_UP_BOTH,
 428
 429         WIRE_X_DOWN_SW,
 430         WIRE_X_DOWN_NE,
 431         WIRE_X_DOWN_BOTH,
 432
 433         WIRE_Y_FLAT_SE,
 434         WIRE_Y_FLAT_NW,
 435         WIRE_Y_FLAT_BOTH,
 436
 437         WIRE_Y_UP_SE,
 438         WIRE_Y_UP_NW,
 439         WIRE_Y_UP_BOTH,
 440
 441         WIRE_Y_DOWN_SE,
 442         WIRE_Y_DOWN_NW,
 443         WIRE_Y_DOWN_BOTH,
 444
 445         WIRE_NS_W_BOTH,
 446         WIRE_NS_E_BOTH,
 447
 448         WIRE_NS_W_N,
 449         WIRE_NS_E_N,
 450
 451         WIRE_NS_W_S,
 452         WIRE_NS_E_S,
 453
 454         WIRE_EW_N_BOTH,
 455         WIRE_EW_S_BOTH,
 456
 457         WIRE_EW_N_W,
 458         WIRE_EW_S_W,
 459
 460         WIRE_EW_N_E,
 461         WIRE_EW_S_E,
 462
 463         INVALID_CATENARY = 0xFF
 464 };
 465
 466 /* Selects a Wire (with white and grey ends) depending on whether:
 467  * a) none (should never happen)
 468  * b) the first
 469  * c) the second
 470  * d) both
 471  * PCP exists.*/
 472 static const RailCatenarySprite Wires[5][TRACK_END][4] = {
 473         { // Tileh == 0
 474                 {INVALID_CATENARY, WIRE_X_FLAT_NE,   WIRE_X_FLAT_SW,   WIRE_X_FLAT_BOTH},
 475                 {INVALID_CATENARY, WIRE_Y_FLAT_SE,   WIRE_Y_FLAT_NW,   WIRE_Y_FLAT_BOTH},
 476                 {INVALID_CATENARY, WIRE_EW_N_W,      WIRE_EW_N_E,      WIRE_EW_N_BOTH},
 477                 {INVALID_CATENARY, WIRE_EW_S_E,      WIRE_EW_S_W,      WIRE_EW_S_BOTH},
 478                 {INVALID_CATENARY, WIRE_NS_W_S,      WIRE_NS_W_N,      WIRE_NS_W_BOTH},
 479                 {INVALID_CATENARY, WIRE_NS_E_N,      WIRE_NS_E_S,      WIRE_NS_E_BOTH},
 480         }, { // Tileh == 3
 481                 {INVALID_CATENARY, WIRE_X_UP_NE,     WIRE_X_UP_SW,     WIRE_X_UP_BOTH},
 482                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 483                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 484                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 485                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 486                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 487         }, { // Tileh == 6
 488                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 489                 {INVALID_CATENARY, WIRE_Y_UP_SE,     WIRE_Y_UP_NW,     WIRE_Y_UP_BOTH},
 490                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 491                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 492                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 493                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 494         }, { // Tileh == 9
 495                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 496                 {INVALID_CATENARY, WIRE_Y_DOWN_SE,   WIRE_Y_DOWN_NW,   WIRE_Y_DOWN_BOTH},
 497                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 498                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 499                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 500                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 501         }, { // Tileh == 12
 502                 {INVALID_CATENARY, WIRE_X_DOWN_NE,   WIRE_X_DOWN_SW,   WIRE_X_DOWN_BOTH},
 503                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 504                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 505                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 506                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 507                 {INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY, INVALID_CATENARY},
 508         }
 509 };
 510
 511 #endif /* ELRAIL_DATA_H */