OpenTTD: src/map.cpp Source File

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map.cpp
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1 /* $Id: map.cpp 26503 2014-04-24 18:49:24Z rubidium $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * 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.
6 * 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.
7 * 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/>.
8 */
9
12 #include "stdafx.h"
13 #include "debug.h"
14 #include "core/alloc_func.hpp"
15 #include "water_map.h"
16 #include "string_func.h"
17
18 #include "safeguards.h"
19
20 #if defined(_MSC_VER)
21 /* Why the hell is that not in all MSVC headers?? */
22 extern "C" _CRTIMP void __cdecl _assert(void *, void *, unsigned);
23 #endif
24
25 uint _map_log_x;
26 uint _map_log_y;
27 uint _map_size_x;
28 uint _map_size_y;
29 uint _map_size;
30 uint _map_tile_mask;
31
32 Tile *_m = NULL;
33 TileExtended *_me = NULL;
34
35
41 void AllocateMap(uint size_x, uint size_y)
42 {
43 /* Make sure that the map size is within the limits and that
44 * size of both axes is a power of 2. */
45 if (!IsInsideMM(size_x, MIN_MAP_SIZE, MAX_MAP_SIZE + 1) ||
46 !IsInsideMM(size_y, MIN_MAP_SIZE, MAX_MAP_SIZE + 1) ||
47 (size_x & (size_x - 1)) != 0 ||
48 (size_y & (size_y - 1)) != 0) {
49 error("Invalid map size");
50 }
51
52 DEBUG(map, 1, "Allocating map of size %dx%d", size_x, size_y);
53
54 _map_log_x = FindFirstBit(size_x);
55 _map_log_y = FindFirstBit(size_y);
56 _map_size_x = size_x;
57 _map_size_y = size_y;
58 _map_size = size_x * size_y;
59 _map_tile_mask = _map_size - 1;
60
61 free(_m);
62 free(_me);
63
64 _m = CallocT<Tile>(_map_size);
65 _me = CallocT<TileExtended>(_map_size);
66 }
67
68
69 #ifdef _DEBUG
70 TileIndex TileAdd(TileIndex tile, TileIndexDiff add,
71 const char *exp, const char *file, int line)
72 {
73 int dx;
74 int dy;
75 uint x;
76 uint y;
77
78 dx = add & MapMaxX();
79 if (dx >= (int)MapSizeX() / 2) dx -= MapSizeX();
80 dy = (add - dx) / (int)MapSizeX();
81
82 x = TileX(tile) + dx;
83 y = TileY(tile) + dy;
84
85 if (x >= MapSizeX() || y >= MapSizeY()) {
86 char buf[512];
87
88 seprintf(buf, lastof(buf), "TILE_ADD(%s) when adding 0x%.4X and 0x%.4X failed",
89 exp, tile, add);
90 #if !defined(_MSC_VER) || defined(WINCE)
91 fprintf(stderr, "%s:%d %s\n", file, line, buf);
92 #else
93 _assert(buf, (char*)file, line);
94 #endif
95 }
96
97 assert(TileXY(x, y) == TILE_MASK(tile + add));
98
99 return TileXY(x, y);
100 }
101 #endif
102
116 TileIndex TileAddWrap(TileIndex tile, int addx, int addy)
117 {
118 uint x = TileX(tile) + addx;
119 uint y = TileY(tile) + addy;
120
121 /* Disallow void tiles at the north border. */
122 if ((x == 0 || y == 0) && _settings_game.construction.freeform_edges) return INVALID_TILE;
123
124 /* Are we about to wrap? */
125 if (x >= MapMaxX() || y >= MapMaxY()) return INVALID_TILE;
126
127 return TileXY(x, y);
128 }
129
131 extern const TileIndexDiffC _tileoffs_by_diagdir[] = {
132 {-1, 0},
133 { 0, 1},
134 { 1, 0},
135 { 0, -1}
136 };
137
139 extern const TileIndexDiffC _tileoffs_by_dir[] = {
140 {-1, -1},
141 {-1, 0},
142 {-1, 1},
143 { 0, 1},
144 { 1, 1},
145 { 1, 0},
146 { 1, -1},
147 { 0, -1}
148 };
149
159 uint DistanceManhattan(TileIndex t0, TileIndex t1)
160 {
161 const uint dx = Delta(TileX(t0), TileX(t1));
162 const uint dy = Delta(TileY(t0), TileY(t1));
163 return dx + dy;
164 }
165
166
176 uint DistanceSquare(TileIndex t0, TileIndex t1)
177 {
178 const int dx = TileX(t0) - TileX(t1);
179 const int dy = TileY(t0) - TileY(t1);
180 return dx * dx + dy * dy;
181 }
182
183
191 uint DistanceMax(TileIndex t0, TileIndex t1)
192 {
193 const uint dx = Delta(TileX(t0), TileX(t1));
194 const uint dy = Delta(TileY(t0), TileY(t1));
195 return max(dx, dy);
196 }
197
198
207 uint DistanceMaxPlusManhattan(TileIndex t0, TileIndex t1)
208 {
209 const uint dx = Delta(TileX(t0), TileX(t1));
210 const uint dy = Delta(TileY(t0), TileY(t1));
211 return dx > dy ? 2 * dx + dy : 2 * dy + dx;
212 }
213
219 uint DistanceFromEdge(TileIndex tile)
220 {
221 const uint xl = TileX(tile);
222 const uint yl = TileY(tile);
223 const uint xh = MapSizeX() - 1 - xl;
224 const uint yh = MapSizeY() - 1 - yl;
225 const uint minl = min(xl, yl);
226 const uint minh = min(xh, yh);
227 return min(minl, minh);
228 }
229
236 uint DistanceFromEdgeDir(TileIndex tile, DiagDirection dir)
237 {
238 switch (dir) {
239 case DIAGDIR_NE: return TileX(tile) - (_settings_game.construction.freeform_edges ? 1 : 0);
240 case DIAGDIR_NW: return TileY(tile) - (_settings_game.construction.freeform_edges ? 1 : 0);
241 case DIAGDIR_SW: return MapMaxX() - TileX(tile) - 1;
242 case DIAGDIR_SE: return MapMaxY() - TileY(tile) - 1;
243 default: NOT_REACHED();
244 }
245 }
246
260 bool CircularTileSearch(TileIndex *tile, uint size, TestTileOnSearchProc proc, void *user_data)
261 {
262 assert(proc != NULL);
263 assert(size > 0);
264
265 if (size % 2 == 1) {
266 /* If the length of the side is uneven, the center has to be checked
267 * separately, as the pattern of uneven sides requires to go around the center */
268 if (proc(*tile, user_data)) return true;
269
270 /* If tile test is not successful, get one tile up,
271 * ready for a test in first circle around center tile */
272 *tile = TILE_ADD(*tile, TileOffsByDir(DIR_N));
273 return CircularTileSearch(tile, size / 2, 1, 1, proc, user_data);
274 } else {
275 return CircularTileSearch(tile, size / 2, 0, 0, proc, user_data);
276 }
277 }
278
298 bool CircularTileSearch(TileIndex *tile, uint radius, uint w, uint h, TestTileOnSearchProc proc, void *user_data)
299 {
300 assert(proc != NULL);
301 assert(radius > 0);
302
303 uint x = TileX(*tile) + w + 1;
304 uint y = TileY(*tile);
305
306 const uint extent[DIAGDIR_END] = { w, h, w, h };
307
308 for (uint n = 0; n < radius; n++) {
309 for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
310 /* Is the tile within the map? */
311 for (uint j = extent[dir] + n * 2 + 1; j != 0; j--) {
312 if (x < MapSizeX() && y < MapSizeY()) {
313 TileIndex t = TileXY(x, y);
314 /* Is the callback successful? */
315 if (proc(t, user_data)) {
316 /* Stop the search */
317 *tile = t;
318 return true;
319 }
320 }
321
322 /* Step to the next 'neighbour' in the circular line */
323 x += _tileoffs_by_diagdir[dir].x;
324 y += _tileoffs_by_diagdir[dir].y;
325 }
326 }
327 /* Jump to next circle to test */
328 x += _tileoffs_by_dir[DIR_W].x;
329 y += _tileoffs_by_dir[DIR_W].y;
330 }
331
332 *tile = INVALID_TILE;
333 return false;
334 }
335
342 uint GetClosestWaterDistance(TileIndex tile, bool water)
343 {
344 if (HasTileWaterGround(tile) == water) return 0;
345
346 uint max_dist = water ? 0x7F : 0x200;
347
348 int x = TileX(tile);
349 int y = TileY(tile);
350
351 uint max_x = MapMaxX();
352 uint max_y = MapMaxY();
353 uint min_xy = _settings_game.construction.freeform_edges ? 1 : 0;
354
355 /* go in a 'spiral' with increasing manhattan distance in each iteration */
356 for (uint dist = 1; dist < max_dist; dist++) {
357 /* next 'diameter' */
358 y--;
359
360 /* going counter-clockwise around this square */
361 for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
362 static const int8 ddx[DIAGDIR_END] = { -1, 1, 1, -1};
363 static const int8 ddy[DIAGDIR_END] = { 1, 1, -1, -1};
364
365 int dx = ddx[dir];
366 int dy = ddy[dir];
367
368 /* each side of this square has length 'dist' */
369 for (uint a = 0; a < dist; a++) {
370 /* MP_VOID tiles are not checked (interval is [min; max) for IsInsideMM())*/
371 if (IsInsideMM(x, min_xy, max_x) && IsInsideMM(y, min_xy, max_y)) {
372 TileIndex t = TileXY(x, y);
373 if (HasTileWaterGround(t) == water) return dist;
374 }
375 x += dx;
376 y += dy;
377 }
378 }
379 }
380
381 if (!water) {
382 /* no land found - is this a water-only map? */
383 for (TileIndex t = 0; t < MapSize(); t++) {
384 if (!IsTileType(t, MP_VOID) && !IsTileType(t, MP_WATER)) return 0x1FF;
385 }
386 }
387
388 return max_dist;
389 }