7959b517 |
1 | /* |
2 | * mines.c: Minesweeper clone with sophisticated grid generation. |
3 | * |
4 | * Still TODO: |
7959b517 |
5 | * |
a174a940 |
6 | * - think about configurably supporting question marks. Once, |
7 | * that is, we've thought about configurability in general! |
7959b517 |
8 | */ |
9 | |
10 | #include <stdio.h> |
11 | #include <stdlib.h> |
12 | #include <string.h> |
13 | #include <assert.h> |
14 | #include <ctype.h> |
15 | #include <math.h> |
16 | |
17 | #include "tree234.h" |
18 | #include "puzzles.h" |
19 | |
20 | enum { |
87871cf1 |
21 | COL_BACKGROUND, COL_BACKGROUND2, |
7959b517 |
22 | COL_1, COL_2, COL_3, COL_4, COL_5, COL_6, COL_7, COL_8, |
23 | COL_MINE, COL_BANG, COL_CROSS, COL_FLAG, COL_FLAGBASE, COL_QUERY, |
24 | COL_HIGHLIGHT, COL_LOWLIGHT, |
25 | NCOLOURS |
26 | }; |
27 | |
28 | #define TILE_SIZE 20 |
29 | #define BORDER (TILE_SIZE * 3 / 2) |
30 | #define HIGHLIGHT_WIDTH 2 |
31 | #define OUTER_HIGHLIGHT_WIDTH 3 |
32 | #define COORD(x) ( (x) * TILE_SIZE + BORDER ) |
33 | #define FROMCOORD(x) ( ((x) - BORDER + TILE_SIZE) / TILE_SIZE - 1 ) |
34 | |
35 | #define FLASH_FRAME 0.13F |
36 | |
37 | struct game_params { |
38 | int w, h, n; |
39 | int unique; |
40 | }; |
41 | |
c380832d |
42 | struct mine_layout { |
43 | /* |
44 | * This structure is shared between all the game_states for a |
45 | * given instance of the puzzle, so we reference-count it. |
46 | */ |
47 | int refcount; |
48 | char *mines; |
49 | /* |
50 | * If we haven't yet actually generated the mine layout, here's |
51 | * all the data we will need to do so. |
52 | */ |
53 | int n, unique; |
54 | random_state *rs; |
55 | midend_data *me; /* to give back the new game desc */ |
56 | }; |
57 | |
7959b517 |
58 | struct game_state { |
59 | int w, h, n, dead, won; |
dfc39b12 |
60 | int used_solve, just_used_solve; |
c380832d |
61 | struct mine_layout *layout; /* real mine positions */ |
27a79972 |
62 | signed char *grid; /* player knowledge */ |
7959b517 |
63 | /* |
64 | * Each item in the `grid' array is one of the following values: |
65 | * |
66 | * - 0 to 8 mean the square is open and has a surrounding mine |
67 | * count. |
68 | * |
69 | * - -1 means the square is marked as a mine. |
70 | * |
71 | * - -2 means the square is unknown. |
72 | * |
73 | * - -3 means the square is marked with a question mark |
74 | * (FIXME: do we even want to bother with this?). |
75 | * |
76 | * - 64 means the square has had a mine revealed when the game |
77 | * was lost. |
78 | * |
79 | * - 65 means the square had a mine revealed and this was the |
80 | * one the player hits. |
81 | * |
82 | * - 66 means the square has a crossed-out mine because the |
83 | * player had incorrectly marked it. |
84 | */ |
85 | }; |
86 | |
87 | static game_params *default_params(void) |
88 | { |
89 | game_params *ret = snew(game_params); |
90 | |
91 | ret->w = ret->h = 9; |
92 | ret->n = 10; |
93 | ret->unique = TRUE; |
94 | |
95 | return ret; |
96 | } |
97 | |
98 | static int game_fetch_preset(int i, char **name, game_params **params) |
99 | { |
100 | game_params *ret; |
101 | char str[80]; |
102 | static const struct { int w, h, n; } values[] = { |
103 | {9, 9, 10}, |
104 | {16, 16, 40}, |
105 | {30, 16, 99}, |
106 | }; |
107 | |
108 | if (i < 0 || i >= lenof(values)) |
109 | return FALSE; |
110 | |
111 | ret = snew(game_params); |
112 | ret->w = values[i].w; |
113 | ret->h = values[i].h; |
114 | ret->n = values[i].n; |
115 | ret->unique = TRUE; |
116 | |
117 | sprintf(str, "%dx%d, %d mines", ret->w, ret->h, ret->n); |
118 | |
119 | *name = dupstr(str); |
120 | *params = ret; |
121 | return TRUE; |
122 | } |
123 | |
124 | static void free_params(game_params *params) |
125 | { |
126 | sfree(params); |
127 | } |
128 | |
129 | static game_params *dup_params(game_params *params) |
130 | { |
131 | game_params *ret = snew(game_params); |
132 | *ret = *params; /* structure copy */ |
133 | return ret; |
134 | } |
135 | |
136 | static void decode_params(game_params *params, char const *string) |
137 | { |
138 | char const *p = string; |
139 | |
140 | params->w = atoi(p); |
141 | while (*p && isdigit((unsigned char)*p)) p++; |
142 | if (*p == 'x') { |
143 | p++; |
144 | params->h = atoi(p); |
145 | while (*p && isdigit((unsigned char)*p)) p++; |
146 | } else { |
147 | params->h = params->w; |
148 | } |
149 | if (*p == 'n') { |
150 | p++; |
151 | params->n = atoi(p); |
152 | while (*p && (*p == '.' || isdigit((unsigned char)*p))) p++; |
153 | } else { |
154 | params->n = params->w * params->h / 10; |
155 | } |
156 | |
157 | while (*p) { |
158 | if (*p == 'a') { |
159 | p++; |
160 | params->unique = FALSE; |
161 | } else |
162 | p++; /* skip any other gunk */ |
163 | } |
164 | } |
165 | |
166 | static char *encode_params(game_params *params, int full) |
167 | { |
168 | char ret[400]; |
169 | int len; |
170 | |
171 | len = sprintf(ret, "%dx%d", params->w, params->h); |
172 | /* |
173 | * Mine count is a generation-time parameter, since it can be |
174 | * deduced from the mine bitmap! |
175 | */ |
176 | if (full) |
177 | len += sprintf(ret+len, "n%d", params->n); |
178 | if (full && !params->unique) |
179 | ret[len++] = 'a'; |
180 | assert(len < lenof(ret)); |
181 | ret[len] = '\0'; |
182 | |
183 | return dupstr(ret); |
184 | } |
185 | |
186 | static config_item *game_configure(game_params *params) |
187 | { |
188 | config_item *ret; |
189 | char buf[80]; |
190 | |
191 | ret = snewn(5, config_item); |
192 | |
193 | ret[0].name = "Width"; |
194 | ret[0].type = C_STRING; |
195 | sprintf(buf, "%d", params->w); |
196 | ret[0].sval = dupstr(buf); |
197 | ret[0].ival = 0; |
198 | |
199 | ret[1].name = "Height"; |
200 | ret[1].type = C_STRING; |
201 | sprintf(buf, "%d", params->h); |
202 | ret[1].sval = dupstr(buf); |
203 | ret[1].ival = 0; |
204 | |
205 | ret[2].name = "Mines"; |
206 | ret[2].type = C_STRING; |
207 | sprintf(buf, "%d", params->n); |
208 | ret[2].sval = dupstr(buf); |
209 | ret[2].ival = 0; |
210 | |
211 | ret[3].name = "Ensure solubility"; |
212 | ret[3].type = C_BOOLEAN; |
213 | ret[3].sval = NULL; |
214 | ret[3].ival = params->unique; |
215 | |
216 | ret[4].name = NULL; |
217 | ret[4].type = C_END; |
218 | ret[4].sval = NULL; |
219 | ret[4].ival = 0; |
220 | |
221 | return ret; |
222 | } |
223 | |
224 | static game_params *custom_params(config_item *cfg) |
225 | { |
226 | game_params *ret = snew(game_params); |
227 | |
228 | ret->w = atoi(cfg[0].sval); |
229 | ret->h = atoi(cfg[1].sval); |
230 | ret->n = atoi(cfg[2].sval); |
08781119 |
231 | if (strchr(cfg[2].sval, '%')) |
232 | ret->n = ret->n * (ret->w * ret->h) / 100; |
7959b517 |
233 | ret->unique = cfg[3].ival; |
234 | |
235 | return ret; |
236 | } |
237 | |
238 | static char *validate_params(game_params *params) |
239 | { |
240 | if (params->w <= 0 && params->h <= 0) |
241 | return "Width and height must both be greater than zero"; |
242 | if (params->w <= 0) |
243 | return "Width must be greater than zero"; |
244 | if (params->h <= 0) |
245 | return "Height must be greater than zero"; |
5d3f9ea6 |
246 | if (params->n > params->w * params->h - 9) |
247 | return "Too many mines for grid size"; |
7959b517 |
248 | |
249 | /* |
250 | * FIXME: Need more constraints here. Not sure what the |
251 | * sensible limits for Minesweeper actually are. The limits |
252 | * probably ought to change, however, depending on uniqueness. |
253 | */ |
254 | |
255 | return NULL; |
256 | } |
257 | |
258 | /* ---------------------------------------------------------------------- |
259 | * Minesweeper solver, used to ensure the generated grids are |
260 | * solvable without having to take risks. |
261 | */ |
262 | |
263 | /* |
264 | * Count the bits in a word. Only needs to cope with 16 bits. |
265 | */ |
266 | static int bitcount16(int word) |
267 | { |
268 | word = ((word & 0xAAAA) >> 1) + (word & 0x5555); |
269 | word = ((word & 0xCCCC) >> 2) + (word & 0x3333); |
270 | word = ((word & 0xF0F0) >> 4) + (word & 0x0F0F); |
271 | word = ((word & 0xFF00) >> 8) + (word & 0x00FF); |
272 | |
273 | return word; |
274 | } |
275 | |
276 | /* |
277 | * We use a tree234 to store a large number of small localised |
278 | * sets, each with a mine count. We also keep some of those sets |
279 | * linked together into a to-do list. |
280 | */ |
281 | struct set { |
282 | short x, y, mask, mines; |
283 | int todo; |
284 | struct set *prev, *next; |
285 | }; |
286 | |
287 | static int setcmp(void *av, void *bv) |
288 | { |
289 | struct set *a = (struct set *)av; |
290 | struct set *b = (struct set *)bv; |
291 | |
292 | if (a->y < b->y) |
293 | return -1; |
294 | else if (a->y > b->y) |
295 | return +1; |
296 | else if (a->x < b->x) |
297 | return -1; |
298 | else if (a->x > b->x) |
299 | return +1; |
300 | else if (a->mask < b->mask) |
301 | return -1; |
302 | else if (a->mask > b->mask) |
303 | return +1; |
304 | else |
305 | return 0; |
306 | } |
307 | |
308 | struct setstore { |
309 | tree234 *sets; |
310 | struct set *todo_head, *todo_tail; |
311 | }; |
312 | |
313 | static struct setstore *ss_new(void) |
314 | { |
315 | struct setstore *ss = snew(struct setstore); |
316 | ss->sets = newtree234(setcmp); |
317 | ss->todo_head = ss->todo_tail = NULL; |
318 | return ss; |
319 | } |
320 | |
321 | /* |
322 | * Take two input sets, in the form (x,y,mask). Munge the first by |
323 | * taking either its intersection with the second or its difference |
324 | * with the second. Return the new mask part of the first set. |
325 | */ |
326 | static int setmunge(int x1, int y1, int mask1, int x2, int y2, int mask2, |
327 | int diff) |
328 | { |
329 | /* |
330 | * Adjust the second set so that it has the same x,y |
331 | * coordinates as the first. |
332 | */ |
333 | if (abs(x2-x1) >= 3 || abs(y2-y1) >= 3) { |
334 | mask2 = 0; |
335 | } else { |
336 | while (x2 > x1) { |
337 | mask2 &= ~(4|32|256); |
338 | mask2 <<= 1; |
339 | x2--; |
340 | } |
341 | while (x2 < x1) { |
342 | mask2 &= ~(1|8|64); |
343 | mask2 >>= 1; |
344 | x2++; |
345 | } |
346 | while (y2 > y1) { |
347 | mask2 &= ~(64|128|256); |
348 | mask2 <<= 3; |
349 | y2--; |
350 | } |
351 | while (y2 < y1) { |
352 | mask2 &= ~(1|2|4); |
353 | mask2 >>= 3; |
354 | y2++; |
355 | } |
356 | } |
357 | |
358 | /* |
359 | * Invert the second set if `diff' is set (we're after A &~ B |
360 | * rather than A & B). |
361 | */ |
362 | if (diff) |
363 | mask2 ^= 511; |
364 | |
365 | /* |
366 | * Now all that's left is a logical AND. |
367 | */ |
368 | return mask1 & mask2; |
369 | } |
370 | |
371 | static void ss_add_todo(struct setstore *ss, struct set *s) |
372 | { |
373 | if (s->todo) |
374 | return; /* already on it */ |
375 | |
376 | #ifdef SOLVER_DIAGNOSTICS |
377 | printf("adding set on todo list: %d,%d %03x %d\n", |
378 | s->x, s->y, s->mask, s->mines); |
379 | #endif |
380 | |
381 | s->prev = ss->todo_tail; |
382 | if (s->prev) |
383 | s->prev->next = s; |
384 | else |
385 | ss->todo_head = s; |
386 | ss->todo_tail = s; |
387 | s->next = NULL; |
388 | s->todo = TRUE; |
389 | } |
390 | |
391 | static void ss_add(struct setstore *ss, int x, int y, int mask, int mines) |
392 | { |
393 | struct set *s; |
394 | |
395 | assert(mask != 0); |
396 | |
397 | /* |
398 | * Normalise so that x and y are genuinely the bounding |
399 | * rectangle. |
400 | */ |
401 | while (!(mask & (1|8|64))) |
402 | mask >>= 1, x++; |
403 | while (!(mask & (1|2|4))) |
404 | mask >>= 3, y++; |
405 | |
406 | /* |
407 | * Create a set structure and add it to the tree. |
408 | */ |
409 | s = snew(struct set); |
410 | s->x = x; |
411 | s->y = y; |
412 | s->mask = mask; |
413 | s->mines = mines; |
414 | s->todo = FALSE; |
415 | if (add234(ss->sets, s) != s) { |
416 | /* |
417 | * This set already existed! Free it and return. |
418 | */ |
419 | sfree(s); |
420 | return; |
421 | } |
422 | |
423 | /* |
424 | * We've added a new set to the tree, so put it on the todo |
425 | * list. |
426 | */ |
427 | ss_add_todo(ss, s); |
428 | } |
429 | |
430 | static void ss_remove(struct setstore *ss, struct set *s) |
431 | { |
432 | struct set *next = s->next, *prev = s->prev; |
433 | |
434 | #ifdef SOLVER_DIAGNOSTICS |
435 | printf("removing set %d,%d %03x\n", s->x, s->y, s->mask); |
436 | #endif |
437 | /* |
438 | * Remove s from the todo list. |
439 | */ |
440 | if (prev) |
441 | prev->next = next; |
442 | else if (s == ss->todo_head) |
443 | ss->todo_head = next; |
444 | |
445 | if (next) |
446 | next->prev = prev; |
447 | else if (s == ss->todo_tail) |
448 | ss->todo_tail = prev; |
449 | |
450 | s->todo = FALSE; |
451 | |
452 | /* |
453 | * Remove s from the tree. |
454 | */ |
455 | del234(ss->sets, s); |
456 | |
457 | /* |
458 | * Destroy the actual set structure. |
459 | */ |
460 | sfree(s); |
461 | } |
462 | |
463 | /* |
464 | * Return a dynamically allocated list of all the sets which |
465 | * overlap a provided input set. |
466 | */ |
467 | static struct set **ss_overlap(struct setstore *ss, int x, int y, int mask) |
468 | { |
469 | struct set **ret = NULL; |
470 | int nret = 0, retsize = 0; |
471 | int xx, yy; |
472 | |
473 | for (xx = x-3; xx < x+3; xx++) |
474 | for (yy = y-3; yy < y+3; yy++) { |
475 | struct set stmp, *s; |
476 | int pos; |
477 | |
478 | /* |
479 | * Find the first set with these top left coordinates. |
480 | */ |
481 | stmp.x = xx; |
482 | stmp.y = yy; |
483 | stmp.mask = 0; |
484 | |
485 | if (findrelpos234(ss->sets, &stmp, NULL, REL234_GE, &pos)) { |
486 | while ((s = index234(ss->sets, pos)) != NULL && |
487 | s->x == xx && s->y == yy) { |
488 | /* |
489 | * This set potentially overlaps the input one. |
490 | * Compute the intersection to see if they |
491 | * really overlap, and add it to the list if |
492 | * so. |
493 | */ |
494 | if (setmunge(x, y, mask, s->x, s->y, s->mask, FALSE)) { |
495 | /* |
496 | * There's an overlap. |
497 | */ |
498 | if (nret >= retsize) { |
499 | retsize = nret + 32; |
500 | ret = sresize(ret, retsize, struct set *); |
501 | } |
502 | ret[nret++] = s; |
503 | } |
504 | |
505 | pos++; |
506 | } |
507 | } |
508 | } |
509 | |
510 | ret = sresize(ret, nret+1, struct set *); |
511 | ret[nret] = NULL; |
512 | |
513 | return ret; |
514 | } |
515 | |
516 | /* |
517 | * Get an element from the head of the set todo list. |
518 | */ |
519 | static struct set *ss_todo(struct setstore *ss) |
520 | { |
521 | if (ss->todo_head) { |
522 | struct set *ret = ss->todo_head; |
523 | ss->todo_head = ret->next; |
524 | if (ss->todo_head) |
525 | ss->todo_head->prev = NULL; |
526 | else |
527 | ss->todo_tail = NULL; |
528 | ret->next = ret->prev = NULL; |
529 | ret->todo = FALSE; |
530 | return ret; |
531 | } else { |
532 | return NULL; |
533 | } |
534 | } |
535 | |
536 | struct squaretodo { |
537 | int *next; |
538 | int head, tail; |
539 | }; |
540 | |
541 | static void std_add(struct squaretodo *std, int i) |
542 | { |
543 | if (std->tail >= 0) |
544 | std->next[std->tail] = i; |
545 | else |
546 | std->head = i; |
547 | std->tail = i; |
548 | std->next[i] = -1; |
549 | } |
550 | |
27a79972 |
551 | static void known_squares(int w, int h, struct squaretodo *std, |
552 | signed char *grid, |
7959b517 |
553 | int (*open)(void *ctx, int x, int y), void *openctx, |
554 | int x, int y, int mask, int mine) |
555 | { |
556 | int xx, yy, bit; |
557 | |
558 | bit = 1; |
559 | |
560 | for (yy = 0; yy < 3; yy++) |
561 | for (xx = 0; xx < 3; xx++) { |
562 | if (mask & bit) { |
563 | int i = (y + yy) * w + (x + xx); |
564 | |
565 | /* |
566 | * It's possible that this square is _already_ |
567 | * known, in which case we don't try to add it to |
568 | * the list twice. |
569 | */ |
570 | if (grid[i] == -2) { |
571 | |
572 | if (mine) { |
573 | grid[i] = -1; /* and don't open it! */ |
574 | } else { |
575 | grid[i] = open(openctx, x + xx, y + yy); |
576 | assert(grid[i] != -1); /* *bang* */ |
577 | } |
578 | std_add(std, i); |
579 | |
580 | } |
581 | } |
582 | bit <<= 1; |
583 | } |
584 | } |
585 | |
586 | /* |
587 | * This is data returned from the `perturb' function. It details |
588 | * which squares have become mines and which have become clear. The |
589 | * solver is (of course) expected to honourably not use that |
590 | * knowledge directly, but to efficently adjust its internal data |
591 | * structures and proceed based on only the information it |
592 | * legitimately has. |
593 | */ |
594 | struct perturbation { |
595 | int x, y; |
596 | int delta; /* +1 == become a mine; -1 == cleared */ |
597 | }; |
598 | struct perturbations { |
599 | int n; |
600 | struct perturbation *changes; |
601 | }; |
602 | |
603 | /* |
604 | * Main solver entry point. You give it a grid of existing |
605 | * knowledge (-1 for a square known to be a mine, 0-8 for empty |
606 | * squares with a given number of neighbours, -2 for completely |
607 | * unknown), plus a function which you can call to open new squares |
608 | * once you're confident of them. It fills in as much more of the |
609 | * grid as it can. |
610 | * |
611 | * Return value is: |
612 | * |
613 | * - -1 means deduction stalled and nothing could be done |
614 | * - 0 means deduction succeeded fully |
615 | * - >0 means deduction succeeded but some number of perturbation |
616 | * steps were required; the exact return value is the number of |
617 | * perturb calls. |
618 | */ |
27a79972 |
619 | static int minesolve(int w, int h, int n, signed char *grid, |
7959b517 |
620 | int (*open)(void *ctx, int x, int y), |
27a79972 |
621 | struct perturbations *(*perturb)(void *ctx, |
622 | signed char *grid, |
7959b517 |
623 | int x, int y, int mask), |
624 | void *ctx, random_state *rs) |
625 | { |
626 | struct setstore *ss = ss_new(); |
627 | struct set **list; |
628 | struct squaretodo astd, *std = &astd; |
629 | int x, y, i, j; |
630 | int nperturbs = 0; |
631 | |
632 | /* |
633 | * Set up a linked list of squares with known contents, so that |
634 | * we can process them one by one. |
635 | */ |
636 | std->next = snewn(w*h, int); |
637 | std->head = std->tail = -1; |
638 | |
639 | /* |
640 | * Initialise that list with all known squares in the input |
641 | * grid. |
642 | */ |
643 | for (y = 0; y < h; y++) { |
644 | for (x = 0; x < w; x++) { |
645 | i = y*w+x; |
646 | if (grid[i] != -2) |
647 | std_add(std, i); |
648 | } |
649 | } |
650 | |
651 | /* |
652 | * Main deductive loop. |
653 | */ |
654 | while (1) { |
655 | int done_something = FALSE; |
656 | struct set *s; |
657 | |
658 | /* |
659 | * If there are any known squares on the todo list, process |
660 | * them and construct a set for each. |
661 | */ |
662 | while (std->head != -1) { |
663 | i = std->head; |
664 | #ifdef SOLVER_DIAGNOSTICS |
665 | printf("known square at %d,%d [%d]\n", i%w, i/w, grid[i]); |
666 | #endif |
667 | std->head = std->next[i]; |
668 | if (std->head == -1) |
669 | std->tail = -1; |
670 | |
671 | x = i % w; |
672 | y = i / w; |
673 | |
674 | if (grid[i] >= 0) { |
675 | int dx, dy, mines, bit, val; |
676 | #ifdef SOLVER_DIAGNOSTICS |
677 | printf("creating set around this square\n"); |
678 | #endif |
679 | /* |
680 | * Empty square. Construct the set of non-known squares |
681 | * around this one, and determine its mine count. |
682 | */ |
683 | mines = grid[i]; |
684 | bit = 1; |
685 | val = 0; |
686 | for (dy = -1; dy <= +1; dy++) { |
687 | for (dx = -1; dx <= +1; dx++) { |
688 | #ifdef SOLVER_DIAGNOSTICS |
689 | printf("grid %d,%d = %d\n", x+dx, y+dy, grid[i+dy*w+dx]); |
690 | #endif |
691 | if (x+dx < 0 || x+dx >= w || y+dy < 0 || y+dy >= h) |
692 | /* ignore this one */; |
693 | else if (grid[i+dy*w+dx] == -1) |
694 | mines--; |
695 | else if (grid[i+dy*w+dx] == -2) |
696 | val |= bit; |
697 | bit <<= 1; |
698 | } |
699 | } |
700 | if (val) |
701 | ss_add(ss, x-1, y-1, val, mines); |
702 | } |
703 | |
704 | /* |
705 | * Now, whether the square is empty or full, we must |
706 | * find any set which contains it and replace it with |
707 | * one which does not. |
708 | */ |
709 | { |
710 | #ifdef SOLVER_DIAGNOSTICS |
711 | printf("finding sets containing known square %d,%d\n", x, y); |
712 | #endif |
713 | list = ss_overlap(ss, x, y, 1); |
714 | |
715 | for (j = 0; list[j]; j++) { |
716 | int newmask, newmines; |
717 | |
718 | s = list[j]; |
719 | |
720 | /* |
721 | * Compute the mask for this set minus the |
722 | * newly known square. |
723 | */ |
724 | newmask = setmunge(s->x, s->y, s->mask, x, y, 1, TRUE); |
725 | |
726 | /* |
727 | * Compute the new mine count. |
728 | */ |
729 | newmines = s->mines - (grid[i] == -1); |
730 | |
731 | /* |
732 | * Insert the new set into the collection, |
733 | * unless it's been whittled right down to |
734 | * nothing. |
735 | */ |
736 | if (newmask) |
737 | ss_add(ss, s->x, s->y, newmask, newmines); |
738 | |
739 | /* |
740 | * Destroy the old one; it is actually obsolete. |
741 | */ |
742 | ss_remove(ss, s); |
743 | } |
744 | |
745 | sfree(list); |
746 | } |
747 | |
748 | /* |
749 | * Marking a fresh square as known certainly counts as |
750 | * doing something. |
751 | */ |
752 | done_something = TRUE; |
753 | } |
754 | |
755 | /* |
756 | * Now pick a set off the to-do list and attempt deductions |
757 | * based on it. |
758 | */ |
759 | if ((s = ss_todo(ss)) != NULL) { |
760 | |
761 | #ifdef SOLVER_DIAGNOSTICS |
762 | printf("set to do: %d,%d %03x %d\n", s->x, s->y, s->mask, s->mines); |
763 | #endif |
764 | /* |
765 | * Firstly, see if this set has a mine count of zero or |
766 | * of its own cardinality. |
767 | */ |
768 | if (s->mines == 0 || s->mines == bitcount16(s->mask)) { |
769 | /* |
770 | * If so, we can immediately mark all the squares |
771 | * in the set as known. |
772 | */ |
773 | #ifdef SOLVER_DIAGNOSTICS |
774 | printf("easy\n"); |
775 | #endif |
776 | known_squares(w, h, std, grid, open, ctx, |
777 | s->x, s->y, s->mask, (s->mines != 0)); |
778 | |
779 | /* |
780 | * Having done that, we need do nothing further |
781 | * with this set; marking all the squares in it as |
782 | * known will eventually eliminate it, and will |
783 | * also permit further deductions about anything |
784 | * that overlaps it. |
785 | */ |
786 | continue; |
787 | } |
788 | |
789 | /* |
790 | * Failing that, we now search through all the sets |
791 | * which overlap this one. |
792 | */ |
793 | list = ss_overlap(ss, s->x, s->y, s->mask); |
794 | |
795 | for (j = 0; list[j]; j++) { |
796 | struct set *s2 = list[j]; |
797 | int swing, s2wing, swc, s2wc; |
798 | |
799 | /* |
800 | * Find the non-overlapping parts s2-s and s-s2, |
801 | * and their cardinalities. |
802 | * |
803 | * I'm going to refer to these parts as `wings' |
804 | * surrounding the central part common to both |
805 | * sets. The `s wing' is s-s2; the `s2 wing' is |
806 | * s2-s. |
807 | */ |
808 | swing = setmunge(s->x, s->y, s->mask, s2->x, s2->y, s2->mask, |
809 | TRUE); |
810 | s2wing = setmunge(s2->x, s2->y, s2->mask, s->x, s->y, s->mask, |
811 | TRUE); |
812 | swc = bitcount16(swing); |
813 | s2wc = bitcount16(s2wing); |
814 | |
815 | /* |
816 | * If one set has more mines than the other, and |
817 | * the number of extra mines is equal to the |
818 | * cardinality of that set's wing, then we can mark |
819 | * every square in the wing as a known mine, and |
820 | * every square in the other wing as known clear. |
821 | */ |
822 | if (swc == s->mines - s2->mines || |
823 | s2wc == s2->mines - s->mines) { |
824 | known_squares(w, h, std, grid, open, ctx, |
825 | s->x, s->y, swing, |
826 | (swc == s->mines - s2->mines)); |
827 | known_squares(w, h, std, grid, open, ctx, |
828 | s2->x, s2->y, s2wing, |
829 | (s2wc == s2->mines - s->mines)); |
830 | continue; |
831 | } |
832 | |
833 | /* |
834 | * Failing that, see if one set is a subset of the |
835 | * other. If so, we can divide up the mine count of |
836 | * the larger set between the smaller set and its |
837 | * complement, even if neither smaller set ends up |
838 | * being immediately clearable. |
839 | */ |
840 | if (swc == 0 && s2wc != 0) { |
841 | /* s is a subset of s2. */ |
842 | assert(s2->mines > s->mines); |
843 | ss_add(ss, s2->x, s2->y, s2wing, s2->mines - s->mines); |
844 | } else if (s2wc == 0 && swc != 0) { |
845 | /* s2 is a subset of s. */ |
846 | assert(s->mines > s2->mines); |
847 | ss_add(ss, s->x, s->y, swing, s->mines - s2->mines); |
848 | } |
849 | } |
850 | |
851 | sfree(list); |
852 | |
853 | /* |
854 | * In this situation we have definitely done |
855 | * _something_, even if it's only reducing the size of |
856 | * our to-do list. |
857 | */ |
858 | done_something = TRUE; |
859 | } else if (n >= 0) { |
860 | /* |
861 | * We have nothing left on our todo list, which means |
862 | * all localised deductions have failed. Our next step |
863 | * is to resort to global deduction based on the total |
864 | * mine count. This is computationally expensive |
865 | * compared to any of the above deductions, which is |
866 | * why we only ever do it when all else fails, so that |
867 | * hopefully it won't have to happen too often. |
868 | * |
869 | * If you pass n<0 into this solver, that informs it |
870 | * that you do not know the total mine count, so it |
871 | * won't even attempt these deductions. |
872 | */ |
873 | |
874 | int minesleft, squaresleft; |
875 | int nsets, setused[10], cursor; |
876 | |
877 | /* |
878 | * Start by scanning the current grid state to work out |
879 | * how many unknown squares we still have, and how many |
880 | * mines are to be placed in them. |
881 | */ |
882 | squaresleft = 0; |
883 | minesleft = n; |
884 | for (i = 0; i < w*h; i++) { |
885 | if (grid[i] == -1) |
886 | minesleft--; |
887 | else if (grid[i] == -2) |
888 | squaresleft++; |
889 | } |
890 | |
891 | #ifdef SOLVER_DIAGNOSTICS |
892 | printf("global deduction time: squaresleft=%d minesleft=%d\n", |
893 | squaresleft, minesleft); |
894 | for (y = 0; y < h; y++) { |
895 | for (x = 0; x < w; x++) { |
896 | int v = grid[y*w+x]; |
897 | if (v == -1) |
898 | putchar('*'); |
899 | else if (v == -2) |
900 | putchar('?'); |
901 | else if (v == 0) |
902 | putchar('-'); |
903 | else |
904 | putchar('0' + v); |
905 | } |
906 | putchar('\n'); |
907 | } |
908 | #endif |
909 | |
910 | /* |
911 | * If there _are_ no unknown squares, we have actually |
912 | * finished. |
913 | */ |
914 | if (squaresleft == 0) { |
915 | assert(minesleft == 0); |
916 | break; |
917 | } |
918 | |
919 | /* |
920 | * First really simple case: if there are no more mines |
921 | * left, or if there are exactly as many mines left as |
922 | * squares to play them in, then it's all easy. |
923 | */ |
924 | if (minesleft == 0 || minesleft == squaresleft) { |
925 | for (i = 0; i < w*h; i++) |
926 | if (grid[i] == -2) |
927 | known_squares(w, h, std, grid, open, ctx, |
928 | i % w, i / w, 1, minesleft != 0); |
929 | continue; /* now go back to main deductive loop */ |
930 | } |
931 | |
932 | /* |
933 | * Failing that, we have to do some _real_ work. |
934 | * Ideally what we do here is to try every single |
935 | * combination of the currently available sets, in an |
936 | * attempt to find a disjoint union (i.e. a set of |
937 | * squares with a known mine count between them) such |
938 | * that the remaining unknown squares _not_ contained |
939 | * in that union either contain no mines or are all |
940 | * mines. |
941 | * |
942 | * Actually enumerating all 2^n possibilities will get |
943 | * a bit slow for large n, so I artificially cap this |
944 | * recursion at n=10 to avoid too much pain. |
945 | */ |
946 | nsets = count234(ss->sets); |
947 | if (nsets <= lenof(setused)) { |
948 | /* |
949 | * Doing this with actual recursive function calls |
950 | * would get fiddly because a load of local |
951 | * variables from this function would have to be |
952 | * passed down through the recursion. So instead |
953 | * I'm going to use a virtual recursion within this |
954 | * function. The way this works is: |
955 | * |
956 | * - we have an array `setused', such that |
957 | * setused[n] is 0 or 1 depending on whether set |
958 | * n is currently in the union we are |
959 | * considering. |
960 | * |
961 | * - we have a value `cursor' which indicates how |
962 | * much of `setused' we have so far filled in. |
963 | * It's conceptually the recursion depth. |
964 | * |
965 | * We begin by setting `cursor' to zero. Then: |
966 | * |
967 | * - if cursor can advance, we advance it by one. |
968 | * We set the value in `setused' that it went |
969 | * past to 1 if that set is disjoint from |
970 | * anything else currently in `setused', or to 0 |
971 | * otherwise. |
972 | * |
973 | * - If cursor cannot advance because it has |
974 | * reached the end of the setused list, then we |
975 | * have a maximal disjoint union. Check to see |
976 | * whether its mine count has any useful |
977 | * properties. If so, mark all the squares not |
978 | * in the union as known and terminate. |
979 | * |
980 | * - If cursor has reached the end of setused and |
981 | * the algorithm _hasn't_ terminated, back |
982 | * cursor up to the nearest 1, turn it into a 0 |
983 | * and advance cursor just past it. |
984 | * |
985 | * - If we attempt to back up to the nearest 1 and |
986 | * there isn't one at all, then we have gone |
987 | * through all disjoint unions of sets in the |
988 | * list and none of them has been helpful, so we |
989 | * give up. |
990 | */ |
991 | struct set *sets[lenof(setused)]; |
992 | for (i = 0; i < nsets; i++) |
993 | sets[i] = index234(ss->sets, i); |
994 | |
995 | cursor = 0; |
996 | while (1) { |
997 | |
998 | if (cursor < nsets) { |
999 | int ok = TRUE; |
1000 | |
1001 | /* See if any existing set overlaps this one. */ |
1002 | for (i = 0; i < cursor; i++) |
1003 | if (setused[i] && |
1004 | setmunge(sets[cursor]->x, |
1005 | sets[cursor]->y, |
1006 | sets[cursor]->mask, |
1007 | sets[i]->x, sets[i]->y, sets[i]->mask, |
1008 | FALSE)) { |
1009 | ok = FALSE; |
1010 | break; |
1011 | } |
1012 | |
1013 | if (ok) { |
1014 | /* |
1015 | * We're adding this set to our union, |
1016 | * so adjust minesleft and squaresleft |
1017 | * appropriately. |
1018 | */ |
1019 | minesleft -= sets[cursor]->mines; |
1020 | squaresleft -= bitcount16(sets[cursor]->mask); |
1021 | } |
1022 | |
1023 | setused[cursor++] = ok; |
1024 | } else { |
1025 | #ifdef SOLVER_DIAGNOSTICS |
1026 | printf("trying a set combination with %d %d\n", |
1027 | squaresleft, minesleft); |
b498c539 |
1028 | #endif /* SOLVER_DIAGNOSTICS */ |
7959b517 |
1029 | |
1030 | /* |
1031 | * We've reached the end. See if we've got |
1032 | * anything interesting. |
1033 | */ |
1034 | if (squaresleft > 0 && |
1035 | (minesleft == 0 || minesleft == squaresleft)) { |
1036 | /* |
1037 | * We have! There is at least one |
1038 | * square not contained within the set |
1039 | * union we've just found, and we can |
1040 | * deduce that either all such squares |
1041 | * are mines or all are not (depending |
1042 | * on whether minesleft==0). So now all |
1043 | * we have to do is actually go through |
1044 | * the grid, find those squares, and |
1045 | * mark them. |
1046 | */ |
1047 | for (i = 0; i < w*h; i++) |
1048 | if (grid[i] == -2) { |
1049 | int outside = TRUE; |
1050 | y = i / w; |
1051 | x = i % w; |
1052 | for (j = 0; j < nsets; j++) |
1053 | if (setused[j] && |
1054 | setmunge(sets[j]->x, sets[j]->y, |
1055 | sets[j]->mask, x, y, 1, |
1056 | FALSE)) { |
1057 | outside = FALSE; |
1058 | break; |
1059 | } |
1060 | if (outside) |
1061 | known_squares(w, h, std, grid, |
1062 | open, ctx, |
1063 | x, y, 1, minesleft != 0); |
1064 | } |
1065 | |
1066 | done_something = TRUE; |
1067 | break; /* return to main deductive loop */ |
1068 | } |
1069 | |
1070 | /* |
1071 | * If we reach here, then this union hasn't |
1072 | * done us any good, so move on to the |
1073 | * next. Backtrack cursor to the nearest 1, |
1074 | * change it to a 0 and continue. |
1075 | */ |
8586183c |
1076 | while (--cursor >= 0 && !setused[cursor]); |
7959b517 |
1077 | if (cursor >= 0) { |
1078 | assert(setused[cursor]); |
1079 | |
1080 | /* |
1081 | * We're removing this set from our |
1082 | * union, so re-increment minesleft and |
1083 | * squaresleft. |
1084 | */ |
1085 | minesleft += sets[cursor]->mines; |
1086 | squaresleft += bitcount16(sets[cursor]->mask); |
1087 | |
1088 | setused[cursor++] = 0; |
1089 | } else { |
1090 | /* |
1091 | * We've backtracked all the way to the |
1092 | * start without finding a single 1, |
1093 | * which means that our virtual |
1094 | * recursion is complete and nothing |
1095 | * helped. |
1096 | */ |
1097 | break; |
1098 | } |
1099 | } |
1100 | |
1101 | } |
1102 | |
1103 | } |
1104 | } |
1105 | |
1106 | if (done_something) |
1107 | continue; |
1108 | |
1109 | #ifdef SOLVER_DIAGNOSTICS |
1110 | /* |
1111 | * Dump the current known state of the grid. |
1112 | */ |
1113 | printf("solver ran out of steam, ret=%d, grid:\n", nperturbs); |
1114 | for (y = 0; y < h; y++) { |
1115 | for (x = 0; x < w; x++) { |
1116 | int v = grid[y*w+x]; |
1117 | if (v == -1) |
1118 | putchar('*'); |
1119 | else if (v == -2) |
1120 | putchar('?'); |
1121 | else if (v == 0) |
1122 | putchar('-'); |
1123 | else |
1124 | putchar('0' + v); |
1125 | } |
1126 | putchar('\n'); |
1127 | } |
1128 | |
1129 | { |
1130 | struct set *s; |
1131 | |
1132 | for (i = 0; (s = index234(ss->sets, i)) != NULL; i++) |
1133 | printf("remaining set: %d,%d %03x %d\n", s->x, s->y, s->mask, s->mines); |
1134 | } |
1135 | #endif |
1136 | |
1137 | /* |
1138 | * Now we really are at our wits' end as far as solving |
1139 | * this grid goes. Our only remaining option is to call |
1140 | * a perturb function and ask it to modify the grid to |
1141 | * make it easier. |
1142 | */ |
1143 | if (perturb) { |
1144 | struct perturbations *ret; |
1145 | struct set *s; |
1146 | |
1147 | nperturbs++; |
1148 | |
1149 | /* |
1150 | * Choose a set at random from the current selection, |
1151 | * and ask the perturb function to either fill or empty |
1152 | * it. |
1153 | * |
1154 | * If we have no sets at all, we must give up. |
1155 | */ |
a174a940 |
1156 | if (count234(ss->sets) == 0) { |
1157 | #ifdef SOLVER_DIAGNOSTICS |
1158 | printf("perturbing on entire unknown set\n"); |
1159 | #endif |
1160 | ret = perturb(ctx, grid, 0, 0, 0); |
1161 | } else { |
1162 | s = index234(ss->sets, random_upto(rs, count234(ss->sets))); |
7959b517 |
1163 | #ifdef SOLVER_DIAGNOSTICS |
a174a940 |
1164 | printf("perturbing on set %d,%d %03x\n", s->x, s->y, s->mask); |
7959b517 |
1165 | #endif |
a174a940 |
1166 | ret = perturb(ctx, grid, s->x, s->y, s->mask); |
1167 | } |
7959b517 |
1168 | |
1169 | if (ret) { |
1170 | assert(ret->n > 0); /* otherwise should have been NULL */ |
1171 | |
1172 | /* |
1173 | * A number of squares have been fiddled with, and |
1174 | * the returned structure tells us which. Adjust |
1175 | * the mine count in any set which overlaps one of |
1176 | * those squares, and put them back on the to-do |
a174a940 |
1177 | * list. Also, if the square itself is marked as a |
1178 | * known non-mine, put it back on the squares-to-do |
7959b517 |
1179 | * list. |
1180 | */ |
1181 | for (i = 0; i < ret->n; i++) { |
1182 | #ifdef SOLVER_DIAGNOSTICS |
1183 | printf("perturbation %s mine at %d,%d\n", |
1184 | ret->changes[i].delta > 0 ? "added" : "removed", |
1185 | ret->changes[i].x, ret->changes[i].y); |
1186 | #endif |
1187 | |
a174a940 |
1188 | if (ret->changes[i].delta < 0 && |
1189 | grid[ret->changes[i].y*w+ret->changes[i].x] != -2) { |
1190 | std_add(std, ret->changes[i].y*w+ret->changes[i].x); |
1191 | } |
1192 | |
7959b517 |
1193 | list = ss_overlap(ss, |
1194 | ret->changes[i].x, ret->changes[i].y, 1); |
1195 | |
1196 | for (j = 0; list[j]; j++) { |
1197 | list[j]->mines += ret->changes[i].delta; |
1198 | ss_add_todo(ss, list[j]); |
1199 | } |
1200 | |
1201 | sfree(list); |
1202 | } |
1203 | |
1204 | /* |
1205 | * Now free the returned data. |
1206 | */ |
1207 | sfree(ret->changes); |
1208 | sfree(ret); |
1209 | |
1210 | #ifdef SOLVER_DIAGNOSTICS |
1211 | /* |
1212 | * Dump the current known state of the grid. |
1213 | */ |
a174a940 |
1214 | printf("state after perturbation:\n"); |
7959b517 |
1215 | for (y = 0; y < h; y++) { |
1216 | for (x = 0; x < w; x++) { |
1217 | int v = grid[y*w+x]; |
1218 | if (v == -1) |
1219 | putchar('*'); |
1220 | else if (v == -2) |
1221 | putchar('?'); |
1222 | else if (v == 0) |
1223 | putchar('-'); |
1224 | else |
1225 | putchar('0' + v); |
1226 | } |
1227 | putchar('\n'); |
1228 | } |
1229 | |
1230 | { |
1231 | struct set *s; |
1232 | |
1233 | for (i = 0; (s = index234(ss->sets, i)) != NULL; i++) |
1234 | printf("remaining set: %d,%d %03x %d\n", s->x, s->y, s->mask, s->mines); |
1235 | } |
1236 | #endif |
1237 | |
1238 | /* |
1239 | * And now we can go back round the deductive loop. |
1240 | */ |
1241 | continue; |
1242 | } |
1243 | } |
1244 | |
1245 | /* |
1246 | * If we get here, even that didn't work (either we didn't |
1247 | * have a perturb function or it returned failure), so we |
1248 | * give up entirely. |
1249 | */ |
1250 | break; |
1251 | } |
1252 | |
1253 | /* |
1254 | * See if we've got any unknown squares left. |
1255 | */ |
1256 | for (y = 0; y < h; y++) |
1257 | for (x = 0; x < w; x++) |
1258 | if (grid[y*w+x] == -2) { |
1259 | nperturbs = -1; /* failed to complete */ |
1260 | break; |
1261 | } |
1262 | |
1263 | /* |
1264 | * Free the set list and square-todo list. |
1265 | */ |
1266 | { |
1267 | struct set *s; |
1268 | while ((s = delpos234(ss->sets, 0)) != NULL) |
1269 | sfree(s); |
1270 | freetree234(ss->sets); |
1271 | sfree(ss); |
1272 | sfree(std->next); |
1273 | } |
1274 | |
1275 | return nperturbs; |
1276 | } |
1277 | |
1278 | /* ---------------------------------------------------------------------- |
1279 | * Grid generator which uses the above solver. |
1280 | */ |
1281 | |
1282 | struct minectx { |
27a79972 |
1283 | signed char *grid; |
7959b517 |
1284 | int w, h; |
1285 | int sx, sy; |
a174a940 |
1286 | int allow_big_perturbs; |
7959b517 |
1287 | random_state *rs; |
1288 | }; |
1289 | |
1290 | static int mineopen(void *vctx, int x, int y) |
1291 | { |
1292 | struct minectx *ctx = (struct minectx *)vctx; |
1293 | int i, j, n; |
1294 | |
1295 | assert(x >= 0 && x < ctx->w && y >= 0 && y < ctx->h); |
1296 | if (ctx->grid[y * ctx->w + x]) |
1297 | return -1; /* *bang* */ |
1298 | |
1299 | n = 0; |
1300 | for (i = -1; i <= +1; i++) { |
1301 | if (x + i < 0 || x + i >= ctx->w) |
1302 | continue; |
1303 | for (j = -1; j <= +1; j++) { |
1304 | if (y + j < 0 || y + j >= ctx->h) |
1305 | continue; |
1306 | if (i == 0 && j == 0) |
1307 | continue; |
1308 | if (ctx->grid[(y+j) * ctx->w + (x+i)]) |
1309 | n++; |
1310 | } |
1311 | } |
1312 | |
1313 | return n; |
1314 | } |
1315 | |
1316 | /* Structure used internally to mineperturb(). */ |
1317 | struct square { |
1318 | int x, y, type, random; |
1319 | }; |
1320 | static int squarecmp(const void *av, const void *bv) |
1321 | { |
1322 | const struct square *a = (const struct square *)av; |
1323 | const struct square *b = (const struct square *)bv; |
1324 | if (a->type < b->type) |
1325 | return -1; |
1326 | else if (a->type > b->type) |
1327 | return +1; |
1328 | else if (a->random < b->random) |
1329 | return -1; |
1330 | else if (a->random > b->random) |
1331 | return +1; |
1332 | else if (a->y < b->y) |
1333 | return -1; |
1334 | else if (a->y > b->y) |
1335 | return +1; |
1336 | else if (a->x < b->x) |
1337 | return -1; |
1338 | else if (a->x > b->x) |
1339 | return +1; |
1340 | return 0; |
1341 | } |
1342 | |
a174a940 |
1343 | /* |
1344 | * Normally this function is passed an (x,y,mask) set description. |
1345 | * On occasions, though, there is no _localised_ set being used, |
1346 | * and the set being perturbed is supposed to be the entirety of |
1347 | * the unreachable area. This is signified by the special case |
1348 | * mask==0: in this case, anything labelled -2 in the grid is part |
1349 | * of the set. |
1350 | * |
1351 | * Allowing perturbation in this special case appears to make it |
1352 | * guaranteeably possible to generate a workable grid for any mine |
1353 | * density, but they tend to be a bit boring, with mines packed |
1354 | * densely into far corners of the grid and the remainder being |
1355 | * less dense than one might like. Therefore, to improve overall |
1356 | * grid quality I disable this feature for the first few attempts, |
1357 | * and fall back to it after no useful grid has been generated. |
1358 | */ |
27a79972 |
1359 | static struct perturbations *mineperturb(void *vctx, signed char *grid, |
7959b517 |
1360 | int setx, int sety, int mask) |
1361 | { |
1362 | struct minectx *ctx = (struct minectx *)vctx; |
1363 | struct square *sqlist; |
1364 | int x, y, dx, dy, i, n, nfull, nempty; |
a174a940 |
1365 | struct square **tofill, **toempty, **todo; |
7959b517 |
1366 | int ntofill, ntoempty, ntodo, dtodo, dset; |
1367 | struct perturbations *ret; |
a174a940 |
1368 | int *setlist; |
1369 | |
1370 | if (!mask && !ctx->allow_big_perturbs) |
1371 | return NULL; |
7959b517 |
1372 | |
1373 | /* |
1374 | * Make a list of all the squares in the grid which we can |
1375 | * possibly use. This list should be in preference order, which |
1376 | * means |
1377 | * |
1378 | * - first, unknown squares on the boundary of known space |
1379 | * - next, unknown squares beyond that boundary |
1380 | * - as a very last resort, known squares, but not within one |
1381 | * square of the starting position. |
1382 | * |
1383 | * Each of these sections needs to be shuffled independently. |
1384 | * We do this by preparing list of all squares and then sorting |
1385 | * it with a random secondary key. |
1386 | */ |
1387 | sqlist = snewn(ctx->w * ctx->h, struct square); |
1388 | n = 0; |
1389 | for (y = 0; y < ctx->h; y++) |
1390 | for (x = 0; x < ctx->w; x++) { |
1391 | /* |
1392 | * If this square is too near the starting position, |
1393 | * don't put it on the list at all. |
1394 | */ |
1395 | if (abs(y - ctx->sy) <= 1 && abs(x - ctx->sx) <= 1) |
1396 | continue; |
1397 | |
1398 | /* |
1399 | * If this square is in the input set, also don't put |
1400 | * it on the list! |
1401 | */ |
a174a940 |
1402 | if ((mask == 0 && grid[y*ctx->w+x] == -2) || |
1403 | (x >= setx && x < setx + 3 && |
1404 | y >= sety && y < sety + 3 && |
1405 | mask & (1 << ((y-sety)*3+(x-setx))))) |
7959b517 |
1406 | continue; |
1407 | |
1408 | sqlist[n].x = x; |
1409 | sqlist[n].y = y; |
1410 | |
1411 | if (grid[y*ctx->w+x] != -2) { |
1412 | sqlist[n].type = 3; /* known square */ |
1413 | } else { |
1414 | /* |
1415 | * Unknown square. Examine everything around it and |
1416 | * see if it borders on any known squares. If it |
1417 | * does, it's class 1, otherwise it's 2. |
1418 | */ |
1419 | |
1420 | sqlist[n].type = 2; |
1421 | |
1422 | for (dy = -1; dy <= +1; dy++) |
1423 | for (dx = -1; dx <= +1; dx++) |
1424 | if (x+dx >= 0 && x+dx < ctx->w && |
1425 | y+dy >= 0 && y+dy < ctx->h && |
1426 | grid[(y+dy)*ctx->w+(x+dx)] != -2) { |
1427 | sqlist[n].type = 1; |
1428 | break; |
1429 | } |
1430 | } |
1431 | |
1432 | /* |
1433 | * Finally, a random number to cause qsort to |
1434 | * shuffle within each group. |
1435 | */ |
1436 | sqlist[n].random = random_bits(ctx->rs, 31); |
1437 | |
1438 | n++; |
1439 | } |
1440 | |
1441 | qsort(sqlist, n, sizeof(struct square), squarecmp); |
1442 | |
1443 | /* |
1444 | * Now count up the number of full and empty squares in the set |
1445 | * we've been provided. |
1446 | */ |
1447 | nfull = nempty = 0; |
a174a940 |
1448 | if (mask) { |
1449 | for (dy = 0; dy < 3; dy++) |
1450 | for (dx = 0; dx < 3; dx++) |
1451 | if (mask & (1 << (dy*3+dx))) { |
1452 | assert(setx+dx <= ctx->w); |
1453 | assert(sety+dy <= ctx->h); |
1454 | if (ctx->grid[(sety+dy)*ctx->w+(setx+dx)]) |
1455 | nfull++; |
1456 | else |
1457 | nempty++; |
1458 | } |
1459 | } else { |
1460 | for (y = 0; y < ctx->h; y++) |
1461 | for (x = 0; x < ctx->w; x++) |
1462 | if (grid[y*ctx->w+x] == -2) { |
1463 | if (ctx->grid[y*ctx->w+x]) |
1464 | nfull++; |
1465 | else |
1466 | nempty++; |
1467 | } |
1468 | } |
7959b517 |
1469 | |
1470 | /* |
1471 | * Now go through our sorted list until we find either `nfull' |
1472 | * empty squares, or `nempty' full squares; these will be |
1473 | * swapped with the appropriate squares in the set to either |
1474 | * fill or empty the set while keeping the same number of mines |
1475 | * overall. |
1476 | */ |
1477 | ntofill = ntoempty = 0; |
a174a940 |
1478 | if (mask) { |
1479 | tofill = snewn(9, struct square *); |
1480 | toempty = snewn(9, struct square *); |
1481 | } else { |
1482 | tofill = snewn(ctx->w * ctx->h, struct square *); |
1483 | toempty = snewn(ctx->w * ctx->h, struct square *); |
1484 | } |
7959b517 |
1485 | for (i = 0; i < n; i++) { |
1486 | struct square *sq = &sqlist[i]; |
1487 | if (ctx->grid[sq->y * ctx->w + sq->x]) |
1488 | toempty[ntoempty++] = sq; |
1489 | else |
1490 | tofill[ntofill++] = sq; |
1491 | if (ntofill == nfull || ntoempty == nempty) |
1492 | break; |
1493 | } |
1494 | |
1495 | /* |
a174a940 |
1496 | * If we haven't found enough empty squares outside the set to |
1497 | * empty it into _or_ enough full squares outside it to fill it |
1498 | * up with, we'll have to settle for doing only a partial job. |
1499 | * In this case we choose to always _fill_ the set (because |
1500 | * this case will tend to crop up when we're working with very |
1501 | * high mine densities and the only way to get a solvable grid |
1502 | * is going to be to pack most of the mines solidly around the |
1503 | * edges). So now our job is to make a list of the empty |
1504 | * squares in the set, and shuffle that list so that we fill a |
1505 | * random selection of them. |
7959b517 |
1506 | */ |
1507 | if (ntofill != nfull && ntoempty != nempty) { |
a174a940 |
1508 | int k; |
1509 | |
1510 | assert(ntoempty != 0); |
1511 | |
1512 | setlist = snewn(ctx->w * ctx->h, int); |
1513 | i = 0; |
1514 | if (mask) { |
1515 | for (dy = 0; dy < 3; dy++) |
1516 | for (dx = 0; dx < 3; dx++) |
1517 | if (mask & (1 << (dy*3+dx))) { |
1518 | assert(setx+dx <= ctx->w); |
1519 | assert(sety+dy <= ctx->h); |
1520 | if (!ctx->grid[(sety+dy)*ctx->w+(setx+dx)]) |
1521 | setlist[i++] = (sety+dy)*ctx->w+(setx+dx); |
1522 | } |
1523 | } else { |
1524 | for (y = 0; y < ctx->h; y++) |
1525 | for (x = 0; x < ctx->w; x++) |
1526 | if (grid[y*ctx->w+x] == -2) { |
1527 | if (!ctx->grid[y*ctx->w+x]) |
1528 | setlist[i++] = y*ctx->w+x; |
1529 | } |
1530 | } |
1531 | assert(i > ntoempty); |
1532 | /* |
1533 | * Now pick `ntoempty' items at random from the list. |
1534 | */ |
1535 | for (k = 0; k < ntoempty; k++) { |
1536 | int index = k + random_upto(ctx->rs, i - k); |
1537 | int tmp; |
1538 | |
1539 | tmp = setlist[k]; |
1540 | setlist[k] = setlist[index]; |
1541 | setlist[index] = tmp; |
1542 | } |
1543 | } else |
1544 | setlist = NULL; |
7959b517 |
1545 | |
1546 | /* |
1547 | * Now we're pretty much there. We need to either |
1548 | * (a) put a mine in each of the empty squares in the set, and |
1549 | * take one out of each square in `toempty' |
1550 | * (b) take a mine out of each of the full squares in the set, |
1551 | * and put one in each square in `tofill' |
1552 | * depending on which one we've found enough squares to do. |
1553 | * |
1554 | * So we start by constructing our list of changes to return to |
1555 | * the solver, so that it can update its data structures |
1556 | * efficiently rather than having to rescan the whole grid. |
1557 | */ |
1558 | ret = snew(struct perturbations); |
1559 | if (ntofill == nfull) { |
1560 | todo = tofill; |
1561 | ntodo = ntofill; |
1562 | dtodo = +1; |
1563 | dset = -1; |
a174a940 |
1564 | sfree(toempty); |
7959b517 |
1565 | } else { |
a174a940 |
1566 | /* |
1567 | * (We also fall into this case if we've constructed a |
1568 | * setlist.) |
1569 | */ |
7959b517 |
1570 | todo = toempty; |
1571 | ntodo = ntoempty; |
1572 | dtodo = -1; |
1573 | dset = +1; |
a174a940 |
1574 | sfree(tofill); |
7959b517 |
1575 | } |
1576 | ret->n = 2 * ntodo; |
1577 | ret->changes = snewn(ret->n, struct perturbation); |
1578 | for (i = 0; i < ntodo; i++) { |
1579 | ret->changes[i].x = todo[i]->x; |
1580 | ret->changes[i].y = todo[i]->y; |
1581 | ret->changes[i].delta = dtodo; |
1582 | } |
1583 | /* now i == ntodo */ |
a174a940 |
1584 | if (setlist) { |
1585 | int j; |
1586 | assert(todo == toempty); |
1587 | for (j = 0; j < ntoempty; j++) { |
1588 | ret->changes[i].x = setlist[j] % ctx->w; |
1589 | ret->changes[i].y = setlist[j] / ctx->w; |
1590 | ret->changes[i].delta = dset; |
1591 | i++; |
1592 | } |
1593 | sfree(setlist); |
1594 | } else if (mask) { |
1595 | for (dy = 0; dy < 3; dy++) |
1596 | for (dx = 0; dx < 3; dx++) |
1597 | if (mask & (1 << (dy*3+dx))) { |
1598 | int currval = (ctx->grid[(sety+dy)*ctx->w+(setx+dx)] ? +1 : -1); |
1599 | if (dset == -currval) { |
1600 | ret->changes[i].x = setx + dx; |
1601 | ret->changes[i].y = sety + dy; |
1602 | ret->changes[i].delta = dset; |
1603 | i++; |
1604 | } |
7959b517 |
1605 | } |
a174a940 |
1606 | } else { |
1607 | for (y = 0; y < ctx->h; y++) |
1608 | for (x = 0; x < ctx->w; x++) |
1609 | if (grid[y*ctx->w+x] == -2) { |
1610 | int currval = (ctx->grid[y*ctx->w+x] ? +1 : -1); |
1611 | if (dset == -currval) { |
1612 | ret->changes[i].x = x; |
1613 | ret->changes[i].y = y; |
1614 | ret->changes[i].delta = dset; |
1615 | i++; |
1616 | } |
1617 | } |
1618 | } |
7959b517 |
1619 | assert(i == ret->n); |
1620 | |
1621 | sfree(sqlist); |
a174a940 |
1622 | sfree(todo); |
7959b517 |
1623 | |
1624 | /* |
1625 | * Having set up the precise list of changes we're going to |
1626 | * make, we now simply make them and return. |
1627 | */ |
1628 | for (i = 0; i < ret->n; i++) { |
1629 | int delta; |
1630 | |
1631 | x = ret->changes[i].x; |
1632 | y = ret->changes[i].y; |
1633 | delta = ret->changes[i].delta; |
1634 | |
1635 | /* |
1636 | * Check we're not trying to add an existing mine or remove |
1637 | * an absent one. |
1638 | */ |
1639 | assert((delta < 0) ^ (ctx->grid[y*ctx->w+x] == 0)); |
1640 | |
1641 | /* |
1642 | * Actually make the change. |
1643 | */ |
1644 | ctx->grid[y*ctx->w+x] = (delta > 0); |
1645 | |
1646 | /* |
1647 | * Update any numbers already present in the grid. |
1648 | */ |
1649 | for (dy = -1; dy <= +1; dy++) |
1650 | for (dx = -1; dx <= +1; dx++) |
1651 | if (x+dx >= 0 && x+dx < ctx->w && |
1652 | y+dy >= 0 && y+dy < ctx->h && |
1653 | grid[(y+dy)*ctx->w+(x+dx)] != -2) { |
1654 | if (dx == 0 && dy == 0) { |
1655 | /* |
1656 | * The square itself is marked as known in |
1657 | * the grid. Mark it as a mine if it's a |
1658 | * mine, or else work out its number. |
1659 | */ |
1660 | if (delta > 0) { |
1661 | grid[y*ctx->w+x] = -1; |
1662 | } else { |
1663 | int dx2, dy2, minecount = 0; |
1664 | for (dy2 = -1; dy2 <= +1; dy2++) |
1665 | for (dx2 = -1; dx2 <= +1; dx2++) |
1666 | if (x+dx2 >= 0 && x+dx2 < ctx->w && |
1667 | y+dy2 >= 0 && y+dy2 < ctx->h && |
1668 | ctx->grid[(y+dy2)*ctx->w+(x+dx2)]) |
1669 | minecount++; |
1670 | grid[y*ctx->w+x] = minecount; |
1671 | } |
1672 | } else { |
1673 | if (grid[(y+dy)*ctx->w+(x+dx)] >= 0) |
1674 | grid[(y+dy)*ctx->w+(x+dx)] += delta; |
1675 | } |
1676 | } |
1677 | } |
1678 | |
1679 | #ifdef GENERATION_DIAGNOSTICS |
1680 | { |
1681 | int yy, xx; |
1682 | printf("grid after perturbing:\n"); |
1683 | for (yy = 0; yy < ctx->h; yy++) { |
1684 | for (xx = 0; xx < ctx->w; xx++) { |
1685 | int v = ctx->grid[yy*ctx->w+xx]; |
1686 | if (yy == ctx->sy && xx == ctx->sx) { |
1687 | assert(!v); |
1688 | putchar('S'); |
1689 | } else if (v) { |
1690 | putchar('*'); |
1691 | } else { |
1692 | putchar('-'); |
1693 | } |
1694 | } |
1695 | putchar('\n'); |
1696 | } |
1697 | printf("\n"); |
1698 | } |
1699 | #endif |
1700 | |
1701 | return ret; |
1702 | } |
1703 | |
1704 | static char *minegen(int w, int h, int n, int x, int y, int unique, |
1705 | random_state *rs) |
1706 | { |
1707 | char *ret = snewn(w*h, char); |
1708 | int success; |
a174a940 |
1709 | int ntries = 0; |
7959b517 |
1710 | |
1711 | do { |
1712 | success = FALSE; |
a174a940 |
1713 | ntries++; |
7959b517 |
1714 | |
1715 | memset(ret, 0, w*h); |
1716 | |
1717 | /* |
1718 | * Start by placing n mines, none of which is at x,y or within |
1719 | * one square of it. |
1720 | */ |
1721 | { |
1722 | int *tmp = snewn(w*h, int); |
1723 | int i, j, k, nn; |
1724 | |
1725 | /* |
1726 | * Write down the list of possible mine locations. |
1727 | */ |
1728 | k = 0; |
1729 | for (i = 0; i < h; i++) |
1730 | for (j = 0; j < w; j++) |
1731 | if (abs(i - y) > 1 || abs(j - x) > 1) |
1732 | tmp[k++] = i*w+j; |
1733 | |
1734 | /* |
1735 | * Now pick n off the list at random. |
1736 | */ |
1737 | nn = n; |
1738 | while (nn-- > 0) { |
1739 | i = random_upto(rs, k); |
1740 | ret[tmp[i]] = 1; |
1741 | tmp[i] = tmp[--k]; |
1742 | } |
1743 | |
1744 | sfree(tmp); |
1745 | } |
1746 | |
1747 | #ifdef GENERATION_DIAGNOSTICS |
1748 | { |
1749 | int yy, xx; |
1750 | printf("grid after initial generation:\n"); |
1751 | for (yy = 0; yy < h; yy++) { |
1752 | for (xx = 0; xx < w; xx++) { |
1753 | int v = ret[yy*w+xx]; |
1754 | if (yy == y && xx == x) { |
1755 | assert(!v); |
1756 | putchar('S'); |
1757 | } else if (v) { |
1758 | putchar('*'); |
1759 | } else { |
1760 | putchar('-'); |
1761 | } |
1762 | } |
1763 | putchar('\n'); |
1764 | } |
1765 | printf("\n"); |
1766 | } |
1767 | #endif |
1768 | |
1769 | /* |
1770 | * Now set up a results grid to run the solver in, and a |
1771 | * context for the solver to open squares. Then run the solver |
1772 | * repeatedly; if the number of perturb steps ever goes up or |
1773 | * it ever returns -1, give up completely. |
1774 | * |
1775 | * We bypass this bit if we're not after a unique grid. |
1776 | */ |
1777 | if (unique) { |
27a79972 |
1778 | signed char *solvegrid = snewn(w*h, char); |
7959b517 |
1779 | struct minectx actx, *ctx = &actx; |
1780 | int solveret, prevret = -2; |
1781 | |
1782 | ctx->grid = ret; |
1783 | ctx->w = w; |
1784 | ctx->h = h; |
1785 | ctx->sx = x; |
1786 | ctx->sy = y; |
1787 | ctx->rs = rs; |
a174a940 |
1788 | ctx->allow_big_perturbs = (ntries > 100); |
7959b517 |
1789 | |
1790 | while (1) { |
1791 | memset(solvegrid, -2, w*h); |
1792 | solvegrid[y*w+x] = mineopen(ctx, x, y); |
1793 | assert(solvegrid[y*w+x] == 0); /* by deliberate arrangement */ |
1794 | |
1795 | solveret = |
1796 | minesolve(w, h, n, solvegrid, mineopen, mineperturb, ctx, rs); |
1797 | if (solveret < 0 || (prevret >= 0 && solveret >= prevret)) { |
1798 | success = FALSE; |
1799 | break; |
1800 | } else if (solveret == 0) { |
1801 | success = TRUE; |
1802 | break; |
1803 | } |
1804 | } |
1805 | |
1806 | sfree(solvegrid); |
1807 | } else { |
1808 | success = TRUE; |
1809 | } |
1810 | |
1811 | } while (!success); |
1812 | |
1813 | return ret; |
1814 | } |
1815 | |
1816 | /* |
1817 | * The Mines game descriptions contain the location of every mine, |
1818 | * and can therefore be used to cheat. |
1819 | * |
1820 | * It would be pointless to attempt to _prevent_ this form of |
1821 | * cheating by encrypting the description, since Mines is |
1822 | * open-source so anyone can find out the encryption key. However, |
1823 | * I think it is worth doing a bit of gentle obfuscation to prevent |
1824 | * _accidental_ spoilers: if you happened to note that the game ID |
1825 | * starts with an F, for example, you might be unable to put the |
1826 | * knowledge of those mines out of your mind while playing. So, |
1827 | * just as discussions of film endings are rot13ed to avoid |
1828 | * spoiling it for people who don't want to be told, we apply a |
1829 | * keyless, reversible, but visually completely obfuscatory masking |
1830 | * function to the mine bitmap. |
1831 | */ |
1832 | static void obfuscate_bitmap(unsigned char *bmp, int bits, int decode) |
1833 | { |
1834 | int bytes, firsthalf, secondhalf; |
1835 | struct step { |
1836 | unsigned char *seedstart; |
1837 | int seedlen; |
1838 | unsigned char *targetstart; |
1839 | int targetlen; |
1840 | } steps[2]; |
1841 | int i, j; |
1842 | |
1843 | /* |
1844 | * My obfuscation algorithm is similar in concept to the OAEP |
1845 | * encoding used in some forms of RSA. Here's a specification |
1846 | * of it: |
1847 | * |
1848 | * + We have a `masking function' which constructs a stream of |
1849 | * pseudorandom bytes from a seed of some number of input |
1850 | * bytes. |
1851 | * |
1852 | * + We pad out our input bit stream to a whole number of |
1853 | * bytes by adding up to 7 zero bits on the end. (In fact |
1854 | * the bitmap passed as input to this function will already |
1855 | * have had this done in practice.) |
1856 | * |
1857 | * + We divide the _byte_ stream exactly in half, rounding the |
1858 | * half-way position _down_. So an 81-bit input string, for |
1859 | * example, rounds up to 88 bits or 11 bytes, and then |
1860 | * dividing by two gives 5 bytes in the first half and 6 in |
1861 | * the second half. |
1862 | * |
1863 | * + We generate a mask from the second half of the bytes, and |
1864 | * XOR it over the first half. |
1865 | * |
1866 | * + We generate a mask from the (encoded) first half of the |
1867 | * bytes, and XOR it over the second half. Any null bits at |
1868 | * the end which were added as padding are cleared back to |
1869 | * zero even if this operation would have made them nonzero. |
1870 | * |
1871 | * To de-obfuscate, the steps are precisely the same except |
1872 | * that the final two are reversed. |
1873 | * |
1874 | * Finally, our masking function. Given an input seed string of |
1875 | * bytes, the output mask consists of concatenating the SHA-1 |
1876 | * hashes of the seed string and successive decimal integers, |
1877 | * starting from 0. |
1878 | */ |
1879 | |
1880 | bytes = (bits + 7) / 8; |
1881 | firsthalf = bytes / 2; |
1882 | secondhalf = bytes - firsthalf; |
1883 | |
1884 | steps[decode ? 1 : 0].seedstart = bmp + firsthalf; |
1885 | steps[decode ? 1 : 0].seedlen = secondhalf; |
1886 | steps[decode ? 1 : 0].targetstart = bmp; |
1887 | steps[decode ? 1 : 0].targetlen = firsthalf; |
1888 | |
1889 | steps[decode ? 0 : 1].seedstart = bmp; |
1890 | steps[decode ? 0 : 1].seedlen = firsthalf; |
1891 | steps[decode ? 0 : 1].targetstart = bmp + firsthalf; |
1892 | steps[decode ? 0 : 1].targetlen = secondhalf; |
1893 | |
1894 | for (i = 0; i < 2; i++) { |
1895 | SHA_State base, final; |
1896 | unsigned char digest[20]; |
1897 | char numberbuf[80]; |
1898 | int digestpos = 20, counter = 0; |
1899 | |
1900 | SHA_Init(&base); |
1901 | SHA_Bytes(&base, steps[i].seedstart, steps[i].seedlen); |
1902 | |
1903 | for (j = 0; j < steps[i].targetlen; j++) { |
1904 | if (digestpos >= 20) { |
1905 | sprintf(numberbuf, "%d", counter++); |
1906 | final = base; |
1907 | SHA_Bytes(&final, numberbuf, strlen(numberbuf)); |
1908 | SHA_Final(&final, digest); |
1909 | digestpos = 0; |
1910 | } |
9914f9b6 |
1911 | steps[i].targetstart[j] ^= digest[digestpos++]; |
7959b517 |
1912 | } |
1913 | |
1914 | /* |
1915 | * Mask off the pad bits in the final byte after both steps. |
1916 | */ |
1917 | if (bits % 8) |
1918 | bmp[bits / 8] &= 0xFF & (0xFF00 >> (bits % 8)); |
1919 | } |
1920 | } |
1921 | |
c380832d |
1922 | static char *new_mine_layout(int w, int h, int n, int x, int y, int unique, |
1923 | random_state *rs, char **game_desc) |
7959b517 |
1924 | { |
27a79972 |
1925 | signed char *grid, *ret, *p; |
7959b517 |
1926 | unsigned char *bmp; |
c380832d |
1927 | int i, area; |
7959b517 |
1928 | |
9914f9b6 |
1929 | #ifdef TEST_OBFUSCATION |
1930 | static int tested_obfuscation = FALSE; |
1931 | if (!tested_obfuscation) { |
1932 | /* |
1933 | * A few simple test vectors for the obfuscator. |
1934 | * |
1935 | * First test: the 28-bit stream 1234567. This divides up |
1936 | * into 1234 and 567[0]. The SHA of 56 70 30 (appending |
1937 | * "0") is 15ce8ab946640340bbb99f3f48fd2c45d1a31d30. Thus, |
1938 | * we XOR the 16-bit string 15CE into the input 1234 to get |
1939 | * 07FA. Next, we SHA that with "0": the SHA of 07 FA 30 is |
1940 | * 3370135c5e3da4fed937adc004a79533962b6391. So we XOR the |
1941 | * 12-bit string 337 into the input 567 to get 650. Thus |
1942 | * our output is 07FA650. |
1943 | */ |
1944 | { |
1945 | unsigned char bmp1[] = "\x12\x34\x56\x70"; |
1946 | obfuscate_bitmap(bmp1, 28, FALSE); |
1947 | printf("test 1 encode: %s\n", |
1948 | memcmp(bmp1, "\x07\xfa\x65\x00", 4) ? "failed" : "passed"); |
1949 | obfuscate_bitmap(bmp1, 28, TRUE); |
1950 | printf("test 1 decode: %s\n", |
1951 | memcmp(bmp1, "\x12\x34\x56\x70", 4) ? "failed" : "passed"); |
1952 | } |
1953 | /* |
1954 | * Second test: a long string to make sure we switch from |
1955 | * one SHA to the next correctly. My input string this time |
1956 | * is simply fifty bytes of zeroes. |
1957 | */ |
1958 | { |
1959 | unsigned char bmp2[50]; |
1960 | unsigned char bmp2a[50]; |
1961 | memset(bmp2, 0, 50); |
1962 | memset(bmp2a, 0, 50); |
1963 | obfuscate_bitmap(bmp2, 50 * 8, FALSE); |
1964 | /* |
1965 | * SHA of twenty-five zero bytes plus "0" is |
1966 | * b202c07b990c01f6ff2d544707f60e506019b671. SHA of |
1967 | * twenty-five zero bytes plus "1" is |
1968 | * fcb1d8b5a2f6b592fe6780b36aa9d65dd7aa6db9. Thus our |
1969 | * first half becomes |
1970 | * b202c07b990c01f6ff2d544707f60e506019b671fcb1d8b5a2. |
1971 | * |
1972 | * SHA of that lot plus "0" is |
1973 | * 10b0af913db85d37ca27f52a9f78bba3a80030db. SHA of the |
1974 | * same string plus "1" is |
1975 | * 3d01d8df78e76d382b8106f480135a1bc751d725. So the |
1976 | * second half becomes |
1977 | * 10b0af913db85d37ca27f52a9f78bba3a80030db3d01d8df78. |
1978 | */ |
1979 | printf("test 2 encode: %s\n", |
1980 | memcmp(bmp2, "\xb2\x02\xc0\x7b\x99\x0c\x01\xf6\xff\x2d\x54" |
1981 | "\x47\x07\xf6\x0e\x50\x60\x19\xb6\x71\xfc\xb1\xd8" |
1982 | "\xb5\xa2\x10\xb0\xaf\x91\x3d\xb8\x5d\x37\xca\x27" |
1983 | "\xf5\x2a\x9f\x78\xbb\xa3\xa8\x00\x30\xdb\x3d\x01" |
1984 | "\xd8\xdf\x78", 50) ? "failed" : "passed"); |
1985 | obfuscate_bitmap(bmp2, 50 * 8, TRUE); |
1986 | printf("test 2 decode: %s\n", |
1987 | memcmp(bmp2, bmp2a, 50) ? "failed" : "passed"); |
1988 | } |
1989 | } |
1990 | #endif |
1991 | |
c380832d |
1992 | grid = minegen(w, h, n, x, y, unique, rs); |
7959b517 |
1993 | |
c380832d |
1994 | if (game_desc) { |
1995 | /* |
1996 | * Set up the mine bitmap and obfuscate it. |
1997 | */ |
1998 | area = w * h; |
1999 | bmp = snewn((area + 7) / 8, unsigned char); |
2000 | memset(bmp, 0, (area + 7) / 8); |
2001 | for (i = 0; i < area; i++) { |
2002 | if (grid[i]) |
2003 | bmp[i / 8] |= 0x80 >> (i % 8); |
2004 | } |
2005 | obfuscate_bitmap(bmp, area, FALSE); |
7959b517 |
2006 | |
c380832d |
2007 | /* |
2008 | * Now encode the resulting bitmap in hex. We can work to |
2009 | * nibble rather than byte granularity, since the obfuscation |
2010 | * function guarantees to return a bit string of the same |
2011 | * length as its input. |
2012 | */ |
2013 | ret = snewn((area+3)/4 + 100, char); |
2014 | p = ret + sprintf(ret, "%d,%d,m", x, y); /* 'm' == masked */ |
2015 | for (i = 0; i < (area+3)/4; i++) { |
2016 | int v = bmp[i/2]; |
2017 | if (i % 2 == 0) |
2018 | v >>= 4; |
2019 | *p++ = "0123456789abcdef"[v & 0xF]; |
2020 | } |
2021 | *p = '\0'; |
7959b517 |
2022 | |
c380832d |
2023 | sfree(bmp); |
7959b517 |
2024 | |
c380832d |
2025 | *game_desc = ret; |
2026 | } |
7959b517 |
2027 | |
c380832d |
2028 | return grid; |
2029 | } |
2030 | |
2031 | static char *new_game_desc(game_params *params, random_state *rs, |
6aa6af4c |
2032 | game_aux_info **aux, int interactive) |
c380832d |
2033 | { |
6aa6af4c |
2034 | if (!interactive) { |
2035 | /* |
2036 | * For batch-generated grids, pre-open one square. |
2037 | */ |
2038 | int x = random_upto(rs, params->w); |
2039 | int y = random_upto(rs, params->h); |
27a79972 |
2040 | signed char *grid; |
2041 | char *desc; |
6aa6af4c |
2042 | |
2043 | grid = new_mine_layout(params->w, params->h, params->n, |
2044 | x, y, params->unique, rs, &desc); |
2045 | sfree(grid); |
2046 | return desc; |
2047 | } else { |
2048 | char *rsdesc, *desc; |
2049 | |
2050 | rsdesc = random_state_encode(rs); |
2051 | desc = snewn(strlen(rsdesc) + 100, char); |
2052 | sprintf(desc, "r%d,%c,%s", params->n, params->unique ? 'u' : 'a', rsdesc); |
2053 | sfree(rsdesc); |
2054 | return desc; |
2055 | } |
7959b517 |
2056 | } |
2057 | |
2058 | static void game_free_aux_info(game_aux_info *aux) |
2059 | { |
2060 | assert(!"Shouldn't happen"); |
2061 | } |
2062 | |
2063 | static char *validate_desc(game_params *params, char *desc) |
2064 | { |
2065 | int wh = params->w * params->h; |
2066 | int x, y; |
2067 | |
c380832d |
2068 | if (*desc == 'r') { |
2069 | if (!*desc || !isdigit((unsigned char)*desc)) |
2070 | return "No initial mine count in game description"; |
2071 | while (*desc && isdigit((unsigned char)*desc)) |
2072 | desc++; /* skip over mine count */ |
2073 | if (*desc != ',') |
2074 | return "No ',' after initial x-coordinate in game description"; |
7959b517 |
2075 | desc++; |
c380832d |
2076 | if (*desc != 'u' && *desc != 'a') |
2077 | return "No uniqueness specifier in game description"; |
2078 | desc++; |
2079 | if (*desc != ',') |
2080 | return "No ',' after uniqueness specifier in game description"; |
2081 | /* now ignore the rest */ |
2082 | } else { |
2083 | if (!*desc || !isdigit((unsigned char)*desc)) |
2084 | return "No initial x-coordinate in game description"; |
2085 | x = atoi(desc); |
2086 | if (x < 0 || x >= params->w) |
2087 | return "Initial x-coordinate was out of range"; |
2088 | while (*desc && isdigit((unsigned char)*desc)) |
2089 | desc++; /* skip over x coordinate */ |
2090 | if (*desc != ',') |
2091 | return "No ',' after initial x-coordinate in game description"; |
2092 | desc++; /* eat comma */ |
2093 | if (!*desc || !isdigit((unsigned char)*desc)) |
2094 | return "No initial y-coordinate in game description"; |
2095 | y = atoi(desc); |
2096 | if (y < 0 || y >= params->h) |
2097 | return "Initial y-coordinate was out of range"; |
2098 | while (*desc && isdigit((unsigned char)*desc)) |
2099 | desc++; /* skip over y coordinate */ |
2100 | if (*desc != ',') |
2101 | return "No ',' after initial y-coordinate in game description"; |
2102 | desc++; /* eat comma */ |
2103 | /* eat `m', meaning `masked', if present */ |
2104 | if (*desc == 'm') |
2105 | desc++; |
2106 | /* now just check length of remainder */ |
2107 | if (strlen(desc) != (wh+3)/4) |
2108 | return "Game description is wrong length"; |
2109 | } |
7959b517 |
2110 | |
2111 | return NULL; |
2112 | } |
2113 | |
2114 | static int open_square(game_state *state, int x, int y) |
2115 | { |
2116 | int w = state->w, h = state->h; |
2117 | int xx, yy, nmines, ncovered; |
2118 | |
c380832d |
2119 | if (!state->layout->mines) { |
2120 | /* |
2121 | * We have a preliminary game in which the mine layout |
2122 | * hasn't been generated yet. Generate it based on the |
2123 | * initial click location. |
2124 | */ |
2125 | char *desc; |
2126 | state->layout->mines = new_mine_layout(w, h, state->layout->n, |
2127 | x, y, state->layout->unique, |
2128 | state->layout->rs, |
2129 | &desc); |
2130 | midend_supersede_game_desc(state->layout->me, desc); |
2131 | sfree(desc); |
2132 | random_free(state->layout->rs); |
2133 | state->layout->rs = NULL; |
2134 | } |
2135 | |
2136 | if (state->layout->mines[y*w+x]) { |
7959b517 |
2137 | /* |
11d31eb9 |
2138 | * The player has landed on a mine. Bad luck. Expose the |
2139 | * mine that killed them, but not the rest (in case they |
2140 | * want to Undo and carry on playing). |
7959b517 |
2141 | */ |
2142 | state->dead = TRUE; |
7959b517 |
2143 | state->grid[y*w+x] = 65; |
2144 | return -1; |
2145 | } |
2146 | |
2147 | /* |
2148 | * Otherwise, the player has opened a safe square. Mark it to-do. |
2149 | */ |
2150 | state->grid[y*w+x] = -10; /* `todo' value internal to this func */ |
2151 | |
2152 | /* |
2153 | * Now go through the grid finding all `todo' values and |
2154 | * opening them. Every time one of them turns out to have no |
2155 | * neighbouring mines, we add all its unopened neighbours to |
2156 | * the list as well. |
2157 | * |
2158 | * FIXME: We really ought to be able to do this better than |
2159 | * using repeated N^2 scans of the grid. |
2160 | */ |
2161 | while (1) { |
2162 | int done_something = FALSE; |
2163 | |
2164 | for (yy = 0; yy < h; yy++) |
2165 | for (xx = 0; xx < w; xx++) |
2166 | if (state->grid[yy*w+xx] == -10) { |
2167 | int dx, dy, v; |
2168 | |
c380832d |
2169 | assert(!state->layout->mines[yy*w+xx]); |
7959b517 |
2170 | |
2171 | v = 0; |
2172 | |
2173 | for (dx = -1; dx <= +1; dx++) |
2174 | for (dy = -1; dy <= +1; dy++) |
2175 | if (xx+dx >= 0 && xx+dx < state->w && |
2176 | yy+dy >= 0 && yy+dy < state->h && |
c380832d |
2177 | state->layout->mines[(yy+dy)*w+(xx+dx)]) |
7959b517 |
2178 | v++; |
2179 | |
2180 | state->grid[yy*w+xx] = v; |
2181 | |
2182 | if (v == 0) { |
2183 | for (dx = -1; dx <= +1; dx++) |
2184 | for (dy = -1; dy <= +1; dy++) |
2185 | if (xx+dx >= 0 && xx+dx < state->w && |
2186 | yy+dy >= 0 && yy+dy < state->h && |
2187 | state->grid[(yy+dy)*w+(xx+dx)] == -2) |
2188 | state->grid[(yy+dy)*w+(xx+dx)] = -10; |
2189 | } |
2190 | |
2191 | done_something = TRUE; |
2192 | } |
2193 | |
2194 | if (!done_something) |
2195 | break; |
2196 | } |
2197 | |
2198 | /* |
2199 | * Finally, scan the grid and see if exactly as many squares |
2200 | * are still covered as there are mines. If so, set the `won' |
2201 | * flag and fill in mine markers on all covered squares. |
2202 | */ |
2203 | nmines = ncovered = 0; |
2204 | for (yy = 0; yy < h; yy++) |
2205 | for (xx = 0; xx < w; xx++) { |
2206 | if (state->grid[yy*w+xx] < 0) |
2207 | ncovered++; |
c380832d |
2208 | if (state->layout->mines[yy*w+xx]) |
7959b517 |
2209 | nmines++; |
2210 | } |
2211 | assert(ncovered >= nmines); |
2212 | if (ncovered == nmines) { |
2213 | for (yy = 0; yy < h; yy++) |
2214 | for (xx = 0; xx < w; xx++) { |
2215 | if (state->grid[yy*w+xx] < 0) |
2216 | state->grid[yy*w+xx] = -1; |
2217 | } |
2218 | state->won = TRUE; |
2219 | } |
2220 | |
2221 | return 0; |
2222 | } |
2223 | |
c380832d |
2224 | static game_state *new_game(midend_data *me, game_params *params, char *desc) |
7959b517 |
2225 | { |
2226 | game_state *state = snew(game_state); |
2227 | int i, wh, x, y, ret, masked; |
2228 | unsigned char *bmp; |
2229 | |
2230 | state->w = params->w; |
2231 | state->h = params->h; |
2232 | state->n = params->n; |
2233 | state->dead = state->won = FALSE; |
dfc39b12 |
2234 | state->used_solve = state->just_used_solve = FALSE; |
7959b517 |
2235 | |
2236 | wh = state->w * state->h; |
7959b517 |
2237 | |
c380832d |
2238 | state->layout = snew(struct mine_layout); |
2239 | state->layout->refcount = 1; |
2240 | |
2241 | state->grid = snewn(wh, char); |
2242 | memset(state->grid, -2, wh); |
2243 | |
2244 | if (*desc == 'r') { |
2245 | desc++; |
2246 | state->layout->n = atoi(desc); |
2247 | while (*desc && isdigit((unsigned char)*desc)) |
2248 | desc++; /* skip over mine count */ |
2249 | if (*desc) desc++; /* eat comma */ |
2250 | if (*desc == 'a') |
2251 | state->layout->unique = FALSE; |
7959b517 |
2252 | else |
c380832d |
2253 | state->layout->unique = TRUE; |
2254 | desc++; |
2255 | if (*desc) desc++; /* eat comma */ |
7959b517 |
2256 | |
c380832d |
2257 | state->layout->mines = NULL; |
2258 | state->layout->rs = random_state_decode(desc); |
2259 | state->layout->me = me; |
7959b517 |
2260 | |
c380832d |
2261 | } else { |
171fbdaa |
2262 | state->layout->rs = NULL; |
2263 | state->layout->me = NULL; |
7959b517 |
2264 | |
c380832d |
2265 | state->layout->mines = snewn(wh, char); |
2266 | x = atoi(desc); |
2267 | while (*desc && isdigit((unsigned char)*desc)) |
2268 | desc++; /* skip over x coordinate */ |
2269 | if (*desc) desc++; /* eat comma */ |
2270 | y = atoi(desc); |
2271 | while (*desc && isdigit((unsigned char)*desc)) |
2272 | desc++; /* skip over y coordinate */ |
2273 | if (*desc) desc++; /* eat comma */ |
2274 | |
2275 | if (*desc == 'm') { |
2276 | masked = TRUE; |
2277 | desc++; |
2278 | } else { |
2279 | /* |
2280 | * We permit game IDs to be entered by hand without the |
2281 | * masking transformation. |
2282 | */ |
2283 | masked = FALSE; |
2284 | } |
7959b517 |
2285 | |
c380832d |
2286 | bmp = snewn((wh + 7) / 8, unsigned char); |
2287 | memset(bmp, 0, (wh + 7) / 8); |
2288 | for (i = 0; i < (wh+3)/4; i++) { |
2289 | int c = desc[i]; |
2290 | int v; |
2291 | |
2292 | assert(c != 0); /* validate_desc should have caught */ |
2293 | if (c >= '0' && c <= '9') |
2294 | v = c - '0'; |
2295 | else if (c >= 'a' && c <= 'f') |
2296 | v = c - 'a' + 10; |
2297 | else if (c >= 'A' && c <= 'F') |
2298 | v = c - 'A' + 10; |
2299 | else |
2300 | v = 0; |
2301 | |
2302 | bmp[i / 2] |= v << (4 * (1 - (i % 2))); |
2303 | } |
7959b517 |
2304 | |
c380832d |
2305 | if (masked) |
2306 | obfuscate_bitmap(bmp, wh, TRUE); |
2307 | |
2308 | memset(state->layout->mines, 0, wh); |
2309 | for (i = 0; i < wh; i++) { |
2310 | if (bmp[i / 8] & (0x80 >> (i % 8))) |
2311 | state->layout->mines[i] = 1; |
2312 | } |
2313 | |
2314 | ret = open_square(state, x, y); |
2315 | } |
7959b517 |
2316 | |
2317 | return state; |
2318 | } |
2319 | |
2320 | static game_state *dup_game(game_state *state) |
2321 | { |
2322 | game_state *ret = snew(game_state); |
2323 | |
2324 | ret->w = state->w; |
2325 | ret->h = state->h; |
2326 | ret->n = state->n; |
2327 | ret->dead = state->dead; |
2328 | ret->won = state->won; |
dfc39b12 |
2329 | ret->used_solve = state->used_solve; |
2330 | ret->just_used_solve = state->just_used_solve; |
c380832d |
2331 | ret->layout = state->layout; |
2332 | ret->layout->refcount++; |
7959b517 |
2333 | ret->grid = snewn(ret->w * ret->h, char); |
2334 | memcpy(ret->grid, state->grid, ret->w * ret->h); |
2335 | |
2336 | return ret; |
2337 | } |
2338 | |
2339 | static void free_game(game_state *state) |
2340 | { |
c380832d |
2341 | if (--state->layout->refcount <= 0) { |
2342 | sfree(state->layout->mines); |
2343 | if (state->layout->rs) |
2344 | random_free(state->layout->rs); |
2345 | sfree(state->layout); |
2346 | } |
7959b517 |
2347 | sfree(state->grid); |
2348 | sfree(state); |
2349 | } |
2350 | |
2351 | static game_state *solve_game(game_state *state, game_aux_info *aux, |
2352 | char **error) |
2353 | { |
dfc39b12 |
2354 | /* |
2355 | * Simply expose the entire grid as if it were a completed |
2356 | * solution. |
2357 | */ |
2358 | game_state *ret; |
2359 | int yy, xx; |
2360 | |
2361 | if (!state->layout->mines) { |
2362 | *error = "Game has not been started yet"; |
2363 | return NULL; |
2364 | } |
2365 | |
2366 | ret = dup_game(state); |
2367 | for (yy = 0; yy < ret->h; yy++) |
2368 | for (xx = 0; xx < ret->w; xx++) { |
2369 | |
2370 | if (ret->layout->mines[yy*ret->w+xx]) { |
2371 | ret->grid[yy*ret->w+xx] = -1; |
2372 | } else { |
2373 | int dx, dy, v; |
2374 | |
2375 | v = 0; |
2376 | |
2377 | for (dx = -1; dx <= +1; dx++) |
2378 | for (dy = -1; dy <= +1; dy++) |
2379 | if (xx+dx >= 0 && xx+dx < ret->w && |
2380 | yy+dy >= 0 && yy+dy < ret->h && |
2381 | ret->layout->mines[(yy+dy)*ret->w+(xx+dx)]) |
2382 | v++; |
2383 | |
2384 | ret->grid[yy*ret->w+xx] = v; |
2385 | } |
2386 | } |
2387 | ret->used_solve = ret->just_used_solve = TRUE; |
2388 | ret->won = TRUE; |
2389 | |
2390 | return ret; |
7959b517 |
2391 | } |
2392 | |
2393 | static char *game_text_format(game_state *state) |
2394 | { |
01be48b0 |
2395 | char *ret; |
2396 | int x, y; |
2397 | |
2398 | ret = snewn((state->w + 1) * state->h + 1, char); |
2399 | for (y = 0; y < state->h; y++) { |
2400 | for (x = 0; x < state->w; x++) { |
2401 | int v = state->grid[y*state->w+x]; |
2402 | if (v == 0) |
2403 | v = '-'; |
2404 | else if (v >= 1 && v <= 8) |
2405 | v = '0' + v; |
2406 | else if (v == -1) |
2407 | v = '*'; |
2408 | else if (v == -2 || v == -3) |
2409 | v = '?'; |
2410 | else if (v >= 64) |
2411 | v = '!'; |
2412 | ret[y * (state->w+1) + x] = v; |
2413 | } |
2414 | ret[y * (state->w+1) + state->w] = '\n'; |
2415 | } |
2416 | ret[(state->w + 1) * state->h] = '\0'; |
2417 | |
2418 | return ret; |
7959b517 |
2419 | } |
2420 | |
2421 | struct game_ui { |
2422 | int hx, hy, hradius; /* for mouse-down highlights */ |
2423 | int flash_is_death; |
11d31eb9 |
2424 | int deaths; |
7959b517 |
2425 | }; |
2426 | |
2427 | static game_ui *new_ui(game_state *state) |
2428 | { |
2429 | game_ui *ui = snew(game_ui); |
2430 | ui->hx = ui->hy = -1; |
2431 | ui->hradius = 0; |
11d31eb9 |
2432 | ui->deaths = 0; |
7959b517 |
2433 | ui->flash_is_death = FALSE; /* *shrug* */ |
2434 | return ui; |
2435 | } |
2436 | |
2437 | static void free_ui(game_ui *ui) |
2438 | { |
2439 | sfree(ui); |
2440 | } |
2441 | |
c0361acd |
2442 | static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds, |
2443 | int x, int y, int button) |
7959b517 |
2444 | { |
2445 | game_state *ret; |
2446 | int cx, cy; |
2447 | |
2448 | if (from->dead || from->won) |
2449 | return NULL; /* no further moves permitted */ |
2450 | |
2451 | if (!IS_MOUSE_DOWN(button) && !IS_MOUSE_DRAG(button) && |
2452 | !IS_MOUSE_RELEASE(button)) |
2453 | return NULL; |
2454 | |
2455 | cx = FROMCOORD(x); |
2456 | cy = FROMCOORD(y); |
2457 | if (cx < 0 || cx >= from->w || cy < 0 || cy > from->h) |
2458 | return NULL; |
2459 | |
2460 | if (button == LEFT_BUTTON || button == LEFT_DRAG) { |
2461 | /* |
2462 | * Mouse-downs and mouse-drags just cause highlighting |
2463 | * updates. |
2464 | */ |
2465 | ui->hx = cx; |
2466 | ui->hy = cy; |
2467 | ui->hradius = (from->grid[cy*from->w+cx] >= 0 ? 1 : 0); |
2468 | return from; |
2469 | } |
2470 | |
2471 | if (button == RIGHT_BUTTON) { |
2472 | /* |
2473 | * Right-clicking only works on a covered square, and it |
2474 | * toggles between -1 (marked as mine) and -2 (not marked |
2475 | * as mine). |
2476 | * |
2477 | * FIXME: question marks. |
2478 | */ |
2479 | if (from->grid[cy * from->w + cx] != -2 && |
2480 | from->grid[cy * from->w + cx] != -1) |
2481 | return NULL; |
2482 | |
2483 | ret = dup_game(from); |
dfc39b12 |
2484 | ret->just_used_solve = FALSE; |
7959b517 |
2485 | ret->grid[cy * from->w + cx] ^= (-2 ^ -1); |
2486 | |
2487 | return ret; |
2488 | } |
2489 | |
2490 | if (button == LEFT_RELEASE) { |
2491 | ui->hx = ui->hy = -1; |
2492 | ui->hradius = 0; |
2493 | |
2494 | /* |
2495 | * At this stage we must never return NULL: we have adjusted |
2496 | * the ui, so at worst we return `from'. |
2497 | */ |
2498 | |
2499 | /* |
2500 | * Left-clicking on a covered square opens a tile. Not |
2501 | * permitted if the tile is marked as a mine, for safety. |
2502 | * (Unmark it and _then_ open it.) |
2503 | */ |
2504 | if (from->grid[cy * from->w + cx] == -2 || |
2505 | from->grid[cy * from->w + cx] == -3) { |
2506 | ret = dup_game(from); |
dfc39b12 |
2507 | ret->just_used_solve = FALSE; |
7959b517 |
2508 | open_square(ret, cx, cy); |
11d31eb9 |
2509 | if (ret->dead) |
2510 | ui->deaths++; |
7959b517 |
2511 | return ret; |
2512 | } |
2513 | |
2514 | /* |
2515 | * Left-clicking on an uncovered tile: first we check to see if |
2516 | * the number of mine markers surrounding the tile is equal to |
2517 | * its mine count, and if so then we open all other surrounding |
2518 | * squares. |
2519 | */ |
2520 | if (from->grid[cy * from->w + cx] > 0) { |
2521 | int dy, dx, n; |
2522 | |
2523 | /* Count mine markers. */ |
2524 | n = 0; |
2525 | for (dy = -1; dy <= +1; dy++) |
2526 | for (dx = -1; dx <= +1; dx++) |
2527 | if (cx+dx >= 0 && cx+dx < from->w && |
2528 | cy+dy >= 0 && cy+dy < from->h) { |
2529 | if (from->grid[(cy+dy)*from->w+(cx+dx)] == -1) |
2530 | n++; |
2531 | } |
2532 | |
2533 | if (n == from->grid[cy * from->w + cx]) { |
2534 | ret = dup_game(from); |
dfc39b12 |
2535 | ret->just_used_solve = FALSE; |
7959b517 |
2536 | for (dy = -1; dy <= +1; dy++) |
2537 | for (dx = -1; dx <= +1; dx++) |
2538 | if (cx+dx >= 0 && cx+dx < ret->w && |
2539 | cy+dy >= 0 && cy+dy < ret->h && |
2540 | (ret->grid[(cy+dy)*ret->w+(cx+dx)] == -2 || |
2541 | ret->grid[(cy+dy)*ret->w+(cx+dx)] == -3)) |
2542 | open_square(ret, cx+dx, cy+dy); |
11d31eb9 |
2543 | if (ret->dead) |
2544 | ui->deaths++; |
7959b517 |
2545 | return ret; |
2546 | } |
2547 | } |
2548 | |
2549 | return from; |
2550 | } |
2551 | |
2552 | return NULL; |
2553 | } |
2554 | |
2555 | /* ---------------------------------------------------------------------- |
2556 | * Drawing routines. |
2557 | */ |
2558 | |
2559 | struct game_drawstate { |
2560 | int w, h, started; |
27a79972 |
2561 | signed char *grid; |
7959b517 |
2562 | /* |
2563 | * Items in this `grid' array have all the same values as in |
2564 | * the game_state grid, and in addition: |
2565 | * |
2566 | * - -10 means the tile was drawn `specially' as a result of a |
2567 | * flash, so it will always need redrawing. |
2568 | * |
2569 | * - -22 and -23 mean the tile is highlighted for a possible |
2570 | * click. |
2571 | */ |
2572 | }; |
2573 | |
2574 | static void game_size(game_params *params, int *x, int *y) |
2575 | { |
2576 | *x = BORDER * 2 + TILE_SIZE * params->w; |
2577 | *y = BORDER * 2 + TILE_SIZE * params->h; |
2578 | } |
2579 | |
2580 | static float *game_colours(frontend *fe, game_state *state, int *ncolours) |
2581 | { |
2582 | float *ret = snewn(3 * NCOLOURS, float); |
2583 | |
2584 | frontend_default_colour(fe, &ret[COL_BACKGROUND * 3]); |
2585 | |
87871cf1 |
2586 | ret[COL_BACKGROUND2 * 3 + 0] = ret[COL_BACKGROUND * 3 + 0] * 19.0 / 20.0; |
2587 | ret[COL_BACKGROUND2 * 3 + 1] = ret[COL_BACKGROUND * 3 + 1] * 19.0 / 20.0; |
2588 | ret[COL_BACKGROUND2 * 3 + 2] = ret[COL_BACKGROUND * 3 + 2] * 19.0 / 20.0; |
2589 | |
7959b517 |
2590 | ret[COL_1 * 3 + 0] = 0.0F; |
2591 | ret[COL_1 * 3 + 1] = 0.0F; |
2592 | ret[COL_1 * 3 + 2] = 1.0F; |
2593 | |
2594 | ret[COL_2 * 3 + 0] = 0.0F; |
2595 | ret[COL_2 * 3 + 1] = 0.5F; |
2596 | ret[COL_2 * 3 + 2] = 0.0F; |
2597 | |
2598 | ret[COL_3 * 3 + 0] = 1.0F; |
2599 | ret[COL_3 * 3 + 1] = 0.0F; |
2600 | ret[COL_3 * 3 + 2] = 0.0F; |
2601 | |
2602 | ret[COL_4 * 3 + 0] = 0.0F; |
2603 | ret[COL_4 * 3 + 1] = 0.0F; |
2604 | ret[COL_4 * 3 + 2] = 0.5F; |
2605 | |
2606 | ret[COL_5 * 3 + 0] = 0.5F; |
2607 | ret[COL_5 * 3 + 1] = 0.0F; |
2608 | ret[COL_5 * 3 + 2] = 0.0F; |
2609 | |
2610 | ret[COL_6 * 3 + 0] = 0.0F; |
2611 | ret[COL_6 * 3 + 1] = 0.5F; |
2612 | ret[COL_6 * 3 + 2] = 0.5F; |
2613 | |
2614 | ret[COL_7 * 3 + 0] = 0.0F; |
2615 | ret[COL_7 * 3 + 1] = 0.0F; |
2616 | ret[COL_7 * 3 + 2] = 0.0F; |
2617 | |
2618 | ret[COL_8 * 3 + 0] = 0.5F; |
2619 | ret[COL_8 * 3 + 1] = 0.5F; |
2620 | ret[COL_8 * 3 + 2] = 0.5F; |
2621 | |
2622 | ret[COL_MINE * 3 + 0] = 0.0F; |
2623 | ret[COL_MINE * 3 + 1] = 0.0F; |
2624 | ret[COL_MINE * 3 + 2] = 0.0F; |
2625 | |
2626 | ret[COL_BANG * 3 + 0] = 1.0F; |
2627 | ret[COL_BANG * 3 + 1] = 0.0F; |
2628 | ret[COL_BANG * 3 + 2] = 0.0F; |
2629 | |
2630 | ret[COL_CROSS * 3 + 0] = 1.0F; |
2631 | ret[COL_CROSS * 3 + 1] = 0.0F; |
2632 | ret[COL_CROSS * 3 + 2] = 0.0F; |
2633 | |
2634 | ret[COL_FLAG * 3 + 0] = 1.0F; |
2635 | ret[COL_FLAG * 3 + 1] = 0.0F; |
2636 | ret[COL_FLAG * 3 + 2] = 0.0F; |
2637 | |
2638 | ret[COL_FLAGBASE * 3 + 0] = 0.0F; |
2639 | ret[COL_FLAGBASE * 3 + 1] = 0.0F; |
2640 | ret[COL_FLAGBASE * 3 + 2] = 0.0F; |
2641 | |
2642 | ret[COL_QUERY * 3 + 0] = 0.0F; |
2643 | ret[COL_QUERY * 3 + 1] = 0.0F; |
2644 | ret[COL_QUERY * 3 + 2] = 0.0F; |
2645 | |
2646 | ret[COL_HIGHLIGHT * 3 + 0] = 1.0F; |
2647 | ret[COL_HIGHLIGHT * 3 + 1] = 1.0F; |
2648 | ret[COL_HIGHLIGHT * 3 + 2] = 1.0F; |
2649 | |
2650 | ret[COL_LOWLIGHT * 3 + 0] = ret[COL_BACKGROUND * 3 + 0] * 2.0 / 3.0; |
2651 | ret[COL_LOWLIGHT * 3 + 1] = ret[COL_BACKGROUND * 3 + 1] * 2.0 / 3.0; |
2652 | ret[COL_LOWLIGHT * 3 + 2] = ret[COL_BACKGROUND * 3 + 2] * 2.0 / 3.0; |
2653 | |
2654 | *ncolours = NCOLOURS; |
2655 | return ret; |
2656 | } |
2657 | |
2658 | static game_drawstate *game_new_drawstate(game_state *state) |
2659 | { |
2660 | struct game_drawstate *ds = snew(struct game_drawstate); |
2661 | |
2662 | ds->w = state->w; |
2663 | ds->h = state->h; |
2664 | ds->started = FALSE; |
2665 | ds->grid = snewn(ds->w * ds->h, char); |
2666 | |
2667 | memset(ds->grid, -99, ds->w * ds->h); |
2668 | |
2669 | return ds; |
2670 | } |
2671 | |
2672 | static void game_free_drawstate(game_drawstate *ds) |
2673 | { |
2674 | sfree(ds->grid); |
2675 | sfree(ds); |
2676 | } |
2677 | |
2678 | static void draw_tile(frontend *fe, int x, int y, int v, int bg) |
2679 | { |
2680 | if (v < 0) { |
2681 | int coords[12]; |
2682 | int hl = 0; |
2683 | |
2684 | if (v == -22 || v == -23) { |
2685 | v += 20; |
2686 | |
2687 | /* |
2688 | * Omit the highlights in this case. |
2689 | */ |
87871cf1 |
2690 | draw_rect(fe, x, y, TILE_SIZE, TILE_SIZE, |
2691 | bg == COL_BACKGROUND ? COL_BACKGROUND2 : bg); |
7959b517 |
2692 | draw_line(fe, x, y, x + TILE_SIZE - 1, y, COL_LOWLIGHT); |
2693 | draw_line(fe, x, y, x, y + TILE_SIZE - 1, COL_LOWLIGHT); |
2694 | } else { |
2695 | /* |
2696 | * Draw highlights to indicate the square is covered. |
2697 | */ |
2698 | coords[0] = x + TILE_SIZE - 1; |
2699 | coords[1] = y + TILE_SIZE - 1; |
2700 | coords[2] = x + TILE_SIZE - 1; |
2701 | coords[3] = y; |
2702 | coords[4] = x; |
2703 | coords[5] = y + TILE_SIZE - 1; |
2704 | draw_polygon(fe, coords, 3, TRUE, COL_LOWLIGHT ^ hl); |
2705 | draw_polygon(fe, coords, 3, FALSE, COL_LOWLIGHT ^ hl); |
2706 | |
2707 | coords[0] = x; |
2708 | coords[1] = y; |
2709 | draw_polygon(fe, coords, 3, TRUE, COL_HIGHLIGHT ^ hl); |
2710 | draw_polygon(fe, coords, 3, FALSE, COL_HIGHLIGHT ^ hl); |
2711 | |
2712 | draw_rect(fe, x + HIGHLIGHT_WIDTH, y + HIGHLIGHT_WIDTH, |
2713 | TILE_SIZE - 2*HIGHLIGHT_WIDTH, TILE_SIZE - 2*HIGHLIGHT_WIDTH, |
2714 | bg); |
2715 | } |
2716 | |
2717 | if (v == -1) { |
2718 | /* |
2719 | * Draw a flag. |
2720 | */ |
2721 | #define SETCOORD(n, dx, dy) do { \ |
2722 | coords[(n)*2+0] = x + TILE_SIZE * (dx); \ |
2723 | coords[(n)*2+1] = y + TILE_SIZE * (dy); \ |
2724 | } while (0) |
2725 | SETCOORD(0, 0.6, 0.35); |
2726 | SETCOORD(1, 0.6, 0.7); |
2727 | SETCOORD(2, 0.8, 0.8); |
2728 | SETCOORD(3, 0.25, 0.8); |
2729 | SETCOORD(4, 0.55, 0.7); |
2730 | SETCOORD(5, 0.55, 0.35); |
2731 | draw_polygon(fe, coords, 6, TRUE, COL_FLAGBASE); |
2732 | draw_polygon(fe, coords, 6, FALSE, COL_FLAGBASE); |
2733 | |
2734 | SETCOORD(0, 0.6, 0.2); |
2735 | SETCOORD(1, 0.6, 0.5); |
2736 | SETCOORD(2, 0.2, 0.35); |
2737 | draw_polygon(fe, coords, 3, TRUE, COL_FLAG); |
2738 | draw_polygon(fe, coords, 3, FALSE, COL_FLAG); |
2739 | #undef SETCOORD |
2740 | |
2741 | } else if (v == -3) { |
2742 | /* |
2743 | * Draw a question mark. |
2744 | */ |
2745 | draw_text(fe, x + TILE_SIZE / 2, y + TILE_SIZE / 2, |
2746 | FONT_VARIABLE, TILE_SIZE * 6 / 8, |
2747 | ALIGN_VCENTRE | ALIGN_HCENTRE, |
2748 | COL_QUERY, "?"); |
2749 | } |
2750 | } else { |
2751 | /* |
2752 | * Clear the square to the background colour, and draw thin |
2753 | * grid lines along the top and left. |
2754 | * |
2755 | * Exception is that for value 65 (mine we've just trodden |
2756 | * on), we clear the square to COL_BANG. |
2757 | */ |
2758 | draw_rect(fe, x, y, TILE_SIZE, TILE_SIZE, |
87871cf1 |
2759 | (v == 65 ? COL_BANG : |
2760 | bg == COL_BACKGROUND ? COL_BACKGROUND2 : bg)); |
7959b517 |
2761 | draw_line(fe, x, y, x + TILE_SIZE - 1, y, COL_LOWLIGHT); |
2762 | draw_line(fe, x, y, x, y + TILE_SIZE - 1, COL_LOWLIGHT); |
2763 | |
2764 | if (v > 0 && v <= 8) { |
2765 | /* |
2766 | * Mark a number. |
2767 | */ |
2768 | char str[2]; |
2769 | str[0] = v + '0'; |
2770 | str[1] = '\0'; |
2771 | draw_text(fe, x + TILE_SIZE / 2, y + TILE_SIZE / 2, |
2772 | FONT_VARIABLE, TILE_SIZE * 7 / 8, |
2773 | ALIGN_VCENTRE | ALIGN_HCENTRE, |
2774 | (COL_1 - 1) + v, str); |
2775 | |
2776 | } else if (v >= 64) { |
2777 | /* |
2778 | * Mark a mine. |
2779 | * |
2780 | * FIXME: this could be done better! |
2781 | */ |
2782 | #if 0 |
2783 | draw_text(fe, x + TILE_SIZE / 2, y + TILE_SIZE / 2, |
2784 | FONT_VARIABLE, TILE_SIZE * 7 / 8, |
2785 | ALIGN_VCENTRE | ALIGN_HCENTRE, |
2786 | COL_MINE, "*"); |
2787 | #else |
2788 | { |
2789 | int cx = x + TILE_SIZE / 2; |
2790 | int cy = y + TILE_SIZE / 2; |
2791 | int r = TILE_SIZE / 2 - 3; |
2792 | int coords[4*5*2]; |
2793 | int xdx = 1, xdy = 0, ydx = 0, ydy = 1; |
2794 | int tdx, tdy, i; |
2795 | |
2796 | for (i = 0; i < 4*5*2; i += 5*2) { |
2797 | coords[i+2*0+0] = cx - r/6*xdx + r*4/5*ydx; |
2798 | coords[i+2*0+1] = cy - r/6*xdy + r*4/5*ydy; |
2799 | coords[i+2*1+0] = cx - r/6*xdx + r*ydx; |
2800 | coords[i+2*1+1] = cy - r/6*xdy + r*ydy; |
2801 | coords[i+2*2+0] = cx + r/6*xdx + r*ydx; |
2802 | coords[i+2*2+1] = cy + r/6*xdy + r*ydy; |
2803 | coords[i+2*3+0] = cx + r/6*xdx + r*4/5*ydx; |
2804 | coords[i+2*3+1] = cy + r/6*xdy + r*4/5*ydy; |
2805 | coords[i+2*4+0] = cx + r*3/5*xdx + r*3/5*ydx; |
2806 | coords[i+2*4+1] = cy + r*3/5*xdy + r*3/5*ydy; |
2807 | |
2808 | tdx = ydx; |
2809 | tdy = ydy; |
2810 | ydx = xdx; |
2811 | ydy = xdy; |
2812 | xdx = -tdx; |
2813 | xdy = -tdy; |
2814 | } |
2815 | |
2816 | draw_polygon(fe, coords, 5*4, TRUE, COL_MINE); |
2817 | draw_polygon(fe, coords, 5*4, FALSE, COL_MINE); |
2818 | |
2819 | draw_rect(fe, cx-r/3, cy-r/3, r/3, r/4, COL_HIGHLIGHT); |
2820 | } |
2821 | #endif |
2822 | |
2823 | if (v == 66) { |
2824 | /* |
2825 | * Cross through the mine. |
2826 | */ |
2827 | int dx; |
2828 | for (dx = -1; dx <= +1; dx++) { |
2829 | draw_line(fe, x + 3 + dx, y + 2, |
2830 | x + TILE_SIZE - 3 + dx, |
2831 | y + TILE_SIZE - 2, COL_CROSS); |
2832 | draw_line(fe, x + TILE_SIZE - 3 + dx, y + 2, |
2833 | x + 3 + dx, y + TILE_SIZE - 2, |
2834 | COL_CROSS); |
2835 | } |
2836 | } |
2837 | } |
2838 | } |
2839 | |
2840 | draw_update(fe, x, y, TILE_SIZE, TILE_SIZE); |
2841 | } |
2842 | |
2843 | static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate, |
2844 | game_state *state, int dir, game_ui *ui, |
2845 | float animtime, float flashtime) |
2846 | { |
2847 | int x, y; |
2848 | int mines, markers, bg; |
2849 | |
2850 | if (flashtime) { |
2851 | int frame = (flashtime / FLASH_FRAME); |
2852 | if (frame % 2) |
2853 | bg = (ui->flash_is_death ? COL_BACKGROUND : COL_LOWLIGHT); |
2854 | else |
2855 | bg = (ui->flash_is_death ? COL_BANG : COL_HIGHLIGHT); |
2856 | } else |
2857 | bg = COL_BACKGROUND; |
2858 | |
2859 | if (!ds->started) { |
2860 | int coords[6]; |
2861 | |
2862 | draw_rect(fe, 0, 0, |
2863 | TILE_SIZE * state->w + 2 * BORDER, |
2864 | TILE_SIZE * state->h + 2 * BORDER, COL_BACKGROUND); |
2865 | draw_update(fe, 0, 0, |
2866 | TILE_SIZE * state->w + 2 * BORDER, |
2867 | TILE_SIZE * state->h + 2 * BORDER); |
2868 | |
2869 | /* |
2870 | * Recessed area containing the whole puzzle. |
2871 | */ |
2872 | coords[0] = COORD(state->w) + OUTER_HIGHLIGHT_WIDTH - 1; |
2873 | coords[1] = COORD(state->h) + OUTER_HIGHLIGHT_WIDTH - 1; |
2874 | coords[2] = COORD(state->w) + OUTER_HIGHLIGHT_WIDTH - 1; |
2875 | coords[3] = COORD(0) - OUTER_HIGHLIGHT_WIDTH; |
2876 | coords[4] = COORD(0) - OUTER_HIGHLIGHT_WIDTH; |
2877 | coords[5] = COORD(state->h) + OUTER_HIGHLIGHT_WIDTH - 1; |
2878 | draw_polygon(fe, coords, 3, TRUE, COL_HIGHLIGHT); |
2879 | draw_polygon(fe, coords, 3, FALSE, COL_HIGHLIGHT); |
2880 | |
2881 | coords[1] = COORD(0) - OUTER_HIGHLIGHT_WIDTH; |
2882 | coords[0] = COORD(0) - OUTER_HIGHLIGHT_WIDTH; |
2883 | draw_polygon(fe, coords, 3, TRUE, COL_LOWLIGHT); |
2884 | draw_polygon(fe, coords, 3, FALSE, COL_LOWLIGHT); |
2885 | |
2886 | ds->started = TRUE; |
2887 | } |
2888 | |
2889 | /* |
2890 | * Now draw the tiles. Also in this loop, count up the number |
2891 | * of mines and mine markers. |
2892 | */ |
2893 | mines = markers = 0; |
2894 | for (y = 0; y < ds->h; y++) |
2895 | for (x = 0; x < ds->w; x++) { |
2896 | int v = state->grid[y*ds->w+x]; |
2897 | |
2898 | if (v == -1) |
2899 | markers++; |
c380832d |
2900 | if (state->layout->mines && state->layout->mines[y*ds->w+x]) |
7959b517 |
2901 | mines++; |
2902 | |
2903 | if ((v == -2 || v == -3) && |
2904 | (abs(x-ui->hx) <= ui->hradius && abs(y-ui->hy) <= ui->hradius)) |
2905 | v -= 20; |
2906 | |
2907 | if (ds->grid[y*ds->w+x] != v || bg != COL_BACKGROUND) { |
2908 | draw_tile(fe, COORD(x), COORD(y), v, bg); |
2909 | ds->grid[y*ds->w+x] = (bg == COL_BACKGROUND ? v : -10); |
2910 | } |
2911 | } |
2912 | |
c380832d |
2913 | if (!state->layout->mines) |
2914 | mines = state->layout->n; |
2915 | |
7959b517 |
2916 | /* |
2917 | * Update the status bar. |
2918 | */ |
2919 | { |
2920 | char statusbar[512]; |
2921 | if (state->dead) { |
11d31eb9 |
2922 | sprintf(statusbar, "DEAD!"); |
7959b517 |
2923 | } else if (state->won) { |
dfc39b12 |
2924 | if (state->used_solve) |
2925 | sprintf(statusbar, "Auto-solved."); |
2926 | else |
2927 | sprintf(statusbar, "COMPLETED!"); |
7959b517 |
2928 | } else { |
11d31eb9 |
2929 | sprintf(statusbar, "Marked: %d / %d", markers, mines); |
7959b517 |
2930 | } |
11d31eb9 |
2931 | if (ui->deaths) |
2932 | sprintf(statusbar + strlen(statusbar), |
2933 | " Deaths: %d", ui->deaths); |
7959b517 |
2934 | status_bar(fe, statusbar); |
2935 | } |
2936 | } |
2937 | |
2938 | static float game_anim_length(game_state *oldstate, game_state *newstate, |
2939 | int dir, game_ui *ui) |
2940 | { |
2941 | return 0.0F; |
2942 | } |
2943 | |
2944 | static float game_flash_length(game_state *oldstate, game_state *newstate, |
2945 | int dir, game_ui *ui) |
2946 | { |
dfc39b12 |
2947 | if (oldstate->used_solve || newstate->used_solve) |
2948 | return 0.0F; |
2949 | |
7959b517 |
2950 | if (dir > 0 && !oldstate->dead && !oldstate->won) { |
2951 | if (newstate->dead) { |
2952 | ui->flash_is_death = TRUE; |
2953 | return 3 * FLASH_FRAME; |
2954 | } |
2955 | if (newstate->won) { |
2956 | ui->flash_is_death = FALSE; |
2957 | return 2 * FLASH_FRAME; |
2958 | } |
2959 | } |
2960 | return 0.0F; |
2961 | } |
2962 | |
2963 | static int game_wants_statusbar(void) |
2964 | { |
2965 | return TRUE; |
2966 | } |
2967 | |
48dcdd62 |
2968 | static int game_timing_state(game_state *state) |
2969 | { |
2970 | if (state->dead || state->won || !state->layout->mines) |
2971 | return FALSE; |
2972 | return TRUE; |
2973 | } |
2974 | |
7959b517 |
2975 | #ifdef COMBINED |
2976 | #define thegame mines |
2977 | #endif |
2978 | |
2979 | const struct game thegame = { |
2980 | "Mines", "games.mines", |
2981 | default_params, |
2982 | game_fetch_preset, |
2983 | decode_params, |
2984 | encode_params, |
2985 | free_params, |
2986 | dup_params, |
2987 | TRUE, game_configure, custom_params, |
2988 | validate_params, |
2989 | new_game_desc, |
2990 | game_free_aux_info, |
2991 | validate_desc, |
2992 | new_game, |
2993 | dup_game, |
2994 | free_game, |
dfc39b12 |
2995 | TRUE, solve_game, |
01be48b0 |
2996 | TRUE, game_text_format, |
7959b517 |
2997 | new_ui, |
2998 | free_ui, |
2999 | make_move, |
3000 | game_size, |
3001 | game_colours, |
3002 | game_new_drawstate, |
3003 | game_free_drawstate, |
3004 | game_redraw, |
3005 | game_anim_length, |
3006 | game_flash_length, |
3007 | game_wants_statusbar, |
48dcdd62 |
3008 | TRUE, game_timing_state, |
7959b517 |
3009 | }; |