| 1 | /* |
| 2 | * midend.c: general middle fragment sitting between the |
| 3 | * platform-specific front end and game-specific back end. |
| 4 | * Maintains a move list, takes care of Undo and Redo commands, and |
| 5 | * processes standard keystrokes for undo/redo/new/quit. |
| 6 | */ |
| 7 | |
| 8 | #include <stdio.h> |
| 9 | #include <string.h> |
| 10 | #include <assert.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <ctype.h> |
| 13 | |
| 14 | #include "puzzles.h" |
| 15 | |
| 16 | enum { DEF_PARAMS, DEF_SEED, DEF_DESC }; /* for midend_game_id_int */ |
| 17 | |
| 18 | struct midend_state_entry { |
| 19 | game_state *state; |
| 20 | int special; /* created by solve or restart */ |
| 21 | }; |
| 22 | |
| 23 | struct midend_data { |
| 24 | frontend *frontend; |
| 25 | random_state *random; |
| 26 | const game *ourgame; |
| 27 | |
| 28 | char *desc, *seedstr; |
| 29 | game_aux_info *aux_info; |
| 30 | enum { GOT_SEED, GOT_DESC, GOT_NOTHING } genmode; |
| 31 | int nstates, statesize, statepos; |
| 32 | |
| 33 | game_params **presets; |
| 34 | char **preset_names; |
| 35 | int npresets, presetsize; |
| 36 | |
| 37 | game_params *params, *curparams; |
| 38 | struct midend_state_entry *states; |
| 39 | game_drawstate *drawstate; |
| 40 | game_state *oldstate; |
| 41 | game_ui *ui; |
| 42 | float anim_time, anim_pos; |
| 43 | float flash_time, flash_pos; |
| 44 | int dir; |
| 45 | |
| 46 | int pressed_mouse_button; |
| 47 | }; |
| 48 | |
| 49 | #define ensure(me) do { \ |
| 50 | if ((me)->nstates >= (me)->statesize) { \ |
| 51 | (me)->statesize = (me)->nstates + 128; \ |
| 52 | (me)->states = sresize((me)->states, (me)->statesize, \ |
| 53 | struct midend_state_entry); \ |
| 54 | } \ |
| 55 | } while (0) |
| 56 | |
| 57 | midend_data *midend_new(frontend *fe, const game *ourgame) |
| 58 | { |
| 59 | midend_data *me = snew(midend_data); |
| 60 | void *randseed; |
| 61 | int randseedsize; |
| 62 | |
| 63 | get_random_seed(&randseed, &randseedsize); |
| 64 | |
| 65 | me->frontend = fe; |
| 66 | me->ourgame = ourgame; |
| 67 | me->random = random_init(randseed, randseedsize); |
| 68 | me->nstates = me->statesize = me->statepos = 0; |
| 69 | me->states = NULL; |
| 70 | me->params = ourgame->default_params(); |
| 71 | me->curparams = NULL; |
| 72 | me->desc = NULL; |
| 73 | me->seedstr = NULL; |
| 74 | me->aux_info = NULL; |
| 75 | me->genmode = GOT_NOTHING; |
| 76 | me->drawstate = NULL; |
| 77 | me->oldstate = NULL; |
| 78 | me->presets = NULL; |
| 79 | me->preset_names = NULL; |
| 80 | me->npresets = me->presetsize = 0; |
| 81 | me->anim_time = me->anim_pos = 0.0F; |
| 82 | me->flash_time = me->flash_pos = 0.0F; |
| 83 | me->dir = 0; |
| 84 | me->ui = NULL; |
| 85 | me->pressed_mouse_button = 0; |
| 86 | |
| 87 | sfree(randseed); |
| 88 | |
| 89 | return me; |
| 90 | } |
| 91 | |
| 92 | void midend_free(midend_data *me) |
| 93 | { |
| 94 | sfree(me->states); |
| 95 | sfree(me->desc); |
| 96 | sfree(me->seedstr); |
| 97 | random_free(me->random); |
| 98 | if (me->aux_info) |
| 99 | me->ourgame->free_aux_info(me->aux_info); |
| 100 | me->ourgame->free_params(me->params); |
| 101 | if (me->curparams) |
| 102 | me->ourgame->free_params(me->curparams); |
| 103 | sfree(me); |
| 104 | } |
| 105 | |
| 106 | void midend_size(midend_data *me, int *x, int *y) |
| 107 | { |
| 108 | me->ourgame->size(me->params, x, y); |
| 109 | } |
| 110 | |
| 111 | void midend_set_params(midend_data *me, game_params *params) |
| 112 | { |
| 113 | me->ourgame->free_params(me->params); |
| 114 | me->params = me->ourgame->dup_params(params); |
| 115 | } |
| 116 | |
| 117 | void midend_new_game(midend_data *me) |
| 118 | { |
| 119 | while (me->nstates > 0) |
| 120 | me->ourgame->free_game(me->states[--me->nstates].state); |
| 121 | |
| 122 | if (me->drawstate) |
| 123 | me->ourgame->free_drawstate(me->drawstate); |
| 124 | |
| 125 | assert(me->nstates == 0); |
| 126 | |
| 127 | if (me->genmode == GOT_DESC) { |
| 128 | me->genmode = GOT_NOTHING; |
| 129 | } else { |
| 130 | random_state *rs; |
| 131 | |
| 132 | if (me->genmode == GOT_SEED) { |
| 133 | me->genmode = GOT_NOTHING; |
| 134 | } else { |
| 135 | /* |
| 136 | * Generate a new random seed. 15 digits comes to about |
| 137 | * 48 bits, which should be more than enough. |
| 138 | * |
| 139 | * I'll avoid putting a leading zero on the number, |
| 140 | * just in case it confuses anybody who thinks it's |
| 141 | * processed as an integer rather than a string. |
| 142 | */ |
| 143 | char newseed[16]; |
| 144 | int i; |
| 145 | newseed[15] = '\0'; |
| 146 | newseed[0] = '1' + random_upto(me->random, 9); |
| 147 | for (i = 1; i < 15; i++) |
| 148 | newseed[i] = '0' + random_upto(me->random, 10); |
| 149 | sfree(me->seedstr); |
| 150 | me->seedstr = dupstr(newseed); |
| 151 | |
| 152 | if (me->curparams) |
| 153 | me->ourgame->free_params(me->curparams); |
| 154 | me->curparams = me->ourgame->dup_params(me->params); |
| 155 | } |
| 156 | |
| 157 | sfree(me->desc); |
| 158 | if (me->aux_info) |
| 159 | me->ourgame->free_aux_info(me->aux_info); |
| 160 | me->aux_info = NULL; |
| 161 | |
| 162 | rs = random_init(me->seedstr, strlen(me->seedstr)); |
| 163 | me->desc = me->ourgame->new_desc(me->curparams, rs, &me->aux_info); |
| 164 | random_free(rs); |
| 165 | } |
| 166 | |
| 167 | ensure(me); |
| 168 | me->states[me->nstates].state = |
| 169 | me->ourgame->new_game(me, me->params, me->desc); |
| 170 | me->states[me->nstates].special = TRUE; |
| 171 | me->nstates++; |
| 172 | me->statepos = 1; |
| 173 | me->drawstate = me->ourgame->new_drawstate(me->states[0].state); |
| 174 | if (me->ui) |
| 175 | me->ourgame->free_ui(me->ui); |
| 176 | me->ui = me->ourgame->new_ui(me->states[0].state); |
| 177 | me->pressed_mouse_button = 0; |
| 178 | } |
| 179 | |
| 180 | static int midend_undo(midend_data *me) |
| 181 | { |
| 182 | if (me->statepos > 1) { |
| 183 | me->statepos--; |
| 184 | me->dir = -1; |
| 185 | return 1; |
| 186 | } else |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static int midend_redo(midend_data *me) |
| 191 | { |
| 192 | if (me->statepos < me->nstates) { |
| 193 | me->statepos++; |
| 194 | me->dir = +1; |
| 195 | return 1; |
| 196 | } else |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static void midend_finish_move(midend_data *me) |
| 201 | { |
| 202 | float flashtime; |
| 203 | |
| 204 | /* |
| 205 | * We do not flash if the later of the two states is special. |
| 206 | * This covers both forward Solve moves and backward (undone) |
| 207 | * Restart moves. |
| 208 | */ |
| 209 | if ((me->oldstate || me->statepos > 1) && |
| 210 | ((me->dir > 0 && !me->states[me->statepos-1].special) || |
| 211 | (me->dir < 0 && me->statepos < me->nstates && |
| 212 | !me->states[me->statepos].special))) { |
| 213 | flashtime = me->ourgame->flash_length(me->oldstate ? me->oldstate : |
| 214 | me->states[me->statepos-2].state, |
| 215 | me->states[me->statepos-1].state, |
| 216 | me->oldstate ? me->dir : +1, |
| 217 | me->ui); |
| 218 | if (flashtime > 0) { |
| 219 | me->flash_pos = 0.0F; |
| 220 | me->flash_time = flashtime; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | if (me->oldstate) |
| 225 | me->ourgame->free_game(me->oldstate); |
| 226 | me->oldstate = NULL; |
| 227 | me->anim_pos = me->anim_time = 0; |
| 228 | me->dir = 0; |
| 229 | |
| 230 | if (me->flash_time == 0 && me->anim_time == 0) |
| 231 | deactivate_timer(me->frontend); |
| 232 | else |
| 233 | activate_timer(me->frontend); |
| 234 | } |
| 235 | |
| 236 | static void midend_stop_anim(midend_data *me) |
| 237 | { |
| 238 | if (me->oldstate || me->anim_time) { |
| 239 | midend_finish_move(me); |
| 240 | midend_redraw(me); |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | void midend_restart_game(midend_data *me) |
| 245 | { |
| 246 | game_state *s; |
| 247 | |
| 248 | midend_stop_anim(me); |
| 249 | |
| 250 | assert(me->statepos >= 1); |
| 251 | if (me->statepos == 1) |
| 252 | return; /* no point doing anything at all! */ |
| 253 | |
| 254 | s = me->ourgame->dup_game(me->states[0].state); |
| 255 | |
| 256 | /* |
| 257 | * Now enter the restarted state as the next move. |
| 258 | */ |
| 259 | midend_stop_anim(me); |
| 260 | while (me->nstates > me->statepos) |
| 261 | me->ourgame->free_game(me->states[--me->nstates].state); |
| 262 | ensure(me); |
| 263 | me->states[me->nstates].state = s; |
| 264 | me->states[me->nstates].special = TRUE; /* we just restarted */ |
| 265 | me->statepos = ++me->nstates; |
| 266 | me->anim_time = 0.0; |
| 267 | midend_finish_move(me); |
| 268 | midend_redraw(me); |
| 269 | activate_timer(me->frontend); |
| 270 | } |
| 271 | |
| 272 | static int midend_really_process_key(midend_data *me, int x, int y, int button) |
| 273 | { |
| 274 | game_state *oldstate = |
| 275 | me->ourgame->dup_game(me->states[me->statepos - 1].state); |
| 276 | int special = FALSE, gotspecial = FALSE; |
| 277 | float anim_time; |
| 278 | |
| 279 | if (button == 'n' || button == 'N' || button == '\x0E') { |
| 280 | midend_stop_anim(me); |
| 281 | midend_new_game(me); |
| 282 | midend_redraw(me); |
| 283 | return 1; /* never animate */ |
| 284 | } else if (button == 'u' || button == 'u' || |
| 285 | button == '\x1A' || button == '\x1F') { |
| 286 | midend_stop_anim(me); |
| 287 | special = me->states[me->statepos-1].special; |
| 288 | gotspecial = TRUE; |
| 289 | if (!midend_undo(me)) |
| 290 | return 1; |
| 291 | } else if (button == 'r' || button == 'R' || |
| 292 | button == '\x12') { |
| 293 | midend_stop_anim(me); |
| 294 | if (!midend_redo(me)) |
| 295 | return 1; |
| 296 | } else if (button == 'q' || button == 'Q' || button == '\x11') { |
| 297 | me->ourgame->free_game(oldstate); |
| 298 | return 0; |
| 299 | } else { |
| 300 | game_state *s = |
| 301 | me->ourgame->make_move(me->states[me->statepos-1].state, |
| 302 | me->ui, x, y, button); |
| 303 | |
| 304 | if (s == me->states[me->statepos-1].state) { |
| 305 | /* |
| 306 | * make_move() is allowed to return its input state to |
| 307 | * indicate that although no move has been made, the UI |
| 308 | * state has been updated and a redraw is called for. |
| 309 | */ |
| 310 | midend_redraw(me); |
| 311 | return 1; |
| 312 | } else if (s) { |
| 313 | midend_stop_anim(me); |
| 314 | while (me->nstates > me->statepos) |
| 315 | me->ourgame->free_game(me->states[--me->nstates].state); |
| 316 | ensure(me); |
| 317 | me->states[me->nstates].state = s; |
| 318 | me->states[me->nstates].special = FALSE; /* normal move */ |
| 319 | me->statepos = ++me->nstates; |
| 320 | me->dir = +1; |
| 321 | } else { |
| 322 | me->ourgame->free_game(oldstate); |
| 323 | return 1; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | if (!gotspecial) |
| 328 | special = me->states[me->statepos-1].special; |
| 329 | |
| 330 | /* |
| 331 | * See if this move requires an animation. |
| 332 | */ |
| 333 | if (special) { |
| 334 | anim_time = 0; |
| 335 | } else { |
| 336 | anim_time = me->ourgame->anim_length(oldstate, |
| 337 | me->states[me->statepos-1].state, |
| 338 | me->dir, me->ui); |
| 339 | } |
| 340 | |
| 341 | me->oldstate = oldstate; |
| 342 | if (anim_time > 0) { |
| 343 | me->anim_time = anim_time; |
| 344 | } else { |
| 345 | me->anim_time = 0.0; |
| 346 | midend_finish_move(me); |
| 347 | } |
| 348 | me->anim_pos = 0.0; |
| 349 | |
| 350 | midend_redraw(me); |
| 351 | |
| 352 | activate_timer(me->frontend); |
| 353 | |
| 354 | return 1; |
| 355 | } |
| 356 | |
| 357 | int midend_process_key(midend_data *me, int x, int y, int button) |
| 358 | { |
| 359 | int ret = 1; |
| 360 | |
| 361 | /* |
| 362 | * Harmonise mouse drag and release messages. |
| 363 | * |
| 364 | * Some front ends might accidentally switch from sending, say, |
| 365 | * RIGHT_DRAG messages to sending LEFT_DRAG, half way through a |
| 366 | * drag. (This can happen on the Mac, for example, since |
| 367 | * RIGHT_DRAG is usually done using Command+drag, and if the |
| 368 | * user accidentally releases Command half way through the drag |
| 369 | * then there will be trouble.) |
| 370 | * |
| 371 | * It would be an O(number of front ends) annoyance to fix this |
| 372 | * in the front ends, but an O(number of back ends) annoyance |
| 373 | * to have each game capable of dealing with it. Therefore, we |
| 374 | * fix it _here_ in the common midend code so that it only has |
| 375 | * to be done once. |
| 376 | * |
| 377 | * The possible ways in which things can go screwy in the front |
| 378 | * end are: |
| 379 | * |
| 380 | * - in a system containing multiple physical buttons button |
| 381 | * presses can inadvertently overlap. We can see ABab (caps |
| 382 | * meaning button-down and lowercase meaning button-up) when |
| 383 | * the user had semantically intended AaBb. |
| 384 | * |
| 385 | * - in a system where one button is simulated by means of a |
| 386 | * modifier key and another button, buttons can mutate |
| 387 | * between press and release (possibly during drag). So we |
| 388 | * can see Ab instead of Aa. |
| 389 | * |
| 390 | * Definite requirements are: |
| 391 | * |
| 392 | * - button _presses_ must never be invented or destroyed. If |
| 393 | * the user presses two buttons in succession, the button |
| 394 | * presses must be transferred to the backend unchanged. So |
| 395 | * if we see AaBb , that's fine; if we see ABab (the button |
| 396 | * presses inadvertently overlapped) we must somehow |
| 397 | * `correct' it to AaBb. |
| 398 | * |
| 399 | * - every mouse action must end up looking like a press, zero |
| 400 | * or more drags, then a release. This allows back ends to |
| 401 | * make the _assumption_ that incoming mouse data will be |
| 402 | * sane in this regard, and not worry about the details. |
| 403 | * |
| 404 | * So my policy will be: |
| 405 | * |
| 406 | * - treat any button-up as a button-up for the currently |
| 407 | * pressed button, or ignore it if there is no currently |
| 408 | * pressed button. |
| 409 | * |
| 410 | * - treat any drag as a drag for the currently pressed |
| 411 | * button, or ignore it if there is no currently pressed |
| 412 | * button. |
| 413 | * |
| 414 | * - if we see a button-down while another button is currently |
| 415 | * pressed, invent a button-up for the first one and then |
| 416 | * pass the button-down through as before. |
| 417 | * |
| 418 | */ |
| 419 | if (IS_MOUSE_DRAG(button) || IS_MOUSE_RELEASE(button)) { |
| 420 | if (me->pressed_mouse_button) { |
| 421 | if (IS_MOUSE_DRAG(button)) { |
| 422 | button = me->pressed_mouse_button + |
| 423 | (LEFT_DRAG - LEFT_BUTTON); |
| 424 | } else { |
| 425 | button = me->pressed_mouse_button + |
| 426 | (LEFT_RELEASE - LEFT_BUTTON); |
| 427 | } |
| 428 | } else |
| 429 | return ret; /* ignore it */ |
| 430 | } else if (IS_MOUSE_DOWN(button) && me->pressed_mouse_button) { |
| 431 | /* |
| 432 | * Fabricate a button-up for the previously pressed button. |
| 433 | */ |
| 434 | ret = ret && midend_really_process_key |
| 435 | (me, x, y, (me->pressed_mouse_button + |
| 436 | (LEFT_RELEASE - LEFT_BUTTON))); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Now send on the event we originally received. |
| 441 | */ |
| 442 | ret = ret && midend_really_process_key(me, x, y, button); |
| 443 | |
| 444 | /* |
| 445 | * And update the currently pressed button. |
| 446 | */ |
| 447 | if (IS_MOUSE_RELEASE(button)) |
| 448 | me->pressed_mouse_button = 0; |
| 449 | else if (IS_MOUSE_DOWN(button)) |
| 450 | me->pressed_mouse_button = button; |
| 451 | |
| 452 | return ret; |
| 453 | } |
| 454 | |
| 455 | void midend_redraw(midend_data *me) |
| 456 | { |
| 457 | if (me->statepos > 0 && me->drawstate) { |
| 458 | start_draw(me->frontend); |
| 459 | if (me->oldstate && me->anim_time > 0 && |
| 460 | me->anim_pos < me->anim_time) { |
| 461 | assert(me->dir != 0); |
| 462 | me->ourgame->redraw(me->frontend, me->drawstate, me->oldstate, |
| 463 | me->states[me->statepos-1].state, me->dir, |
| 464 | me->ui, me->anim_pos, me->flash_pos); |
| 465 | } else { |
| 466 | me->ourgame->redraw(me->frontend, me->drawstate, NULL, |
| 467 | me->states[me->statepos-1].state, +1 /*shrug*/, |
| 468 | me->ui, 0.0, me->flash_pos); |
| 469 | } |
| 470 | end_draw(me->frontend); |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | void midend_timer(midend_data *me, float tplus) |
| 475 | { |
| 476 | me->anim_pos += tplus; |
| 477 | if (me->anim_pos >= me->anim_time || |
| 478 | me->anim_time == 0 || !me->oldstate) { |
| 479 | if (me->anim_time > 0) |
| 480 | midend_finish_move(me); |
| 481 | } |
| 482 | me->flash_pos += tplus; |
| 483 | if (me->flash_pos >= me->flash_time || me->flash_time == 0) { |
| 484 | me->flash_pos = me->flash_time = 0; |
| 485 | } |
| 486 | if (me->flash_time == 0 && me->anim_time == 0) |
| 487 | deactivate_timer(me->frontend); |
| 488 | midend_redraw(me); |
| 489 | } |
| 490 | |
| 491 | float *midend_colours(midend_data *me, int *ncolours) |
| 492 | { |
| 493 | game_state *state = NULL; |
| 494 | float *ret; |
| 495 | |
| 496 | if (me->nstates == 0) { |
| 497 | game_aux_info *aux = NULL; |
| 498 | char *desc = me->ourgame->new_desc(me->params, me->random, &aux); |
| 499 | state = me->ourgame->new_game(me, me->params, desc); |
| 500 | sfree(desc); |
| 501 | if (aux) |
| 502 | me->ourgame->free_aux_info(aux); |
| 503 | } else |
| 504 | state = me->states[0].state; |
| 505 | |
| 506 | ret = me->ourgame->colours(me->frontend, state, ncolours); |
| 507 | |
| 508 | { |
| 509 | int i; |
| 510 | |
| 511 | /* |
| 512 | * Allow environment-based overrides for the standard |
| 513 | * colours by defining variables along the lines of |
| 514 | * `NET_COLOUR_4=6000c0'. |
| 515 | */ |
| 516 | |
| 517 | for (i = 0; i < *ncolours; i++) { |
| 518 | char buf[80], *e; |
| 519 | unsigned int r, g, b; |
| 520 | int j; |
| 521 | |
| 522 | sprintf(buf, "%s_COLOUR_%d", me->ourgame->name, i); |
| 523 | for (j = 0; buf[j]; j++) |
| 524 | buf[j] = toupper((unsigned char)buf[j]); |
| 525 | if ((e = getenv(buf)) != NULL && |
| 526 | sscanf(e, "%2x%2x%2x", &r, &g, &b) == 3) { |
| 527 | ret[i*3 + 0] = r / 255.0; |
| 528 | ret[i*3 + 1] = g / 255.0; |
| 529 | ret[i*3 + 2] = b / 255.0; |
| 530 | } |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | if (me->nstates == 0) |
| 535 | me->ourgame->free_game(state); |
| 536 | |
| 537 | return ret; |
| 538 | } |
| 539 | |
| 540 | int midend_num_presets(midend_data *me) |
| 541 | { |
| 542 | if (!me->npresets) { |
| 543 | char *name; |
| 544 | game_params *preset; |
| 545 | |
| 546 | while (me->ourgame->fetch_preset(me->npresets, &name, &preset)) { |
| 547 | if (me->presetsize <= me->npresets) { |
| 548 | me->presetsize = me->npresets + 10; |
| 549 | me->presets = sresize(me->presets, me->presetsize, |
| 550 | game_params *); |
| 551 | me->preset_names = sresize(me->preset_names, me->presetsize, |
| 552 | char *); |
| 553 | } |
| 554 | |
| 555 | me->presets[me->npresets] = preset; |
| 556 | me->preset_names[me->npresets] = name; |
| 557 | me->npresets++; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | { |
| 562 | /* |
| 563 | * Allow environment-based extensions to the preset list by |
| 564 | * defining a variable along the lines of `SOLO_PRESETS=2x3 |
| 565 | * Advanced:2x3da'. Colon-separated list of items, |
| 566 | * alternating between textual titles in the menu and |
| 567 | * encoded parameter strings. |
| 568 | */ |
| 569 | char buf[80], *e, *p; |
| 570 | int j; |
| 571 | |
| 572 | sprintf(buf, "%s_PRESETS", me->ourgame->name); |
| 573 | for (j = 0; buf[j]; j++) |
| 574 | buf[j] = toupper((unsigned char)buf[j]); |
| 575 | |
| 576 | if ((e = getenv(buf)) != NULL) { |
| 577 | p = e = dupstr(e); |
| 578 | |
| 579 | while (*p) { |
| 580 | char *name, *val; |
| 581 | game_params *preset; |
| 582 | |
| 583 | name = p; |
| 584 | while (*p && *p != ':') p++; |
| 585 | if (*p) *p++ = '\0'; |
| 586 | val = p; |
| 587 | while (*p && *p != ':') p++; |
| 588 | if (*p) *p++ = '\0'; |
| 589 | |
| 590 | preset = me->ourgame->default_params(); |
| 591 | me->ourgame->decode_params(preset, val); |
| 592 | |
| 593 | if (me->ourgame->validate_params(preset)) { |
| 594 | /* Drop this one from the list. */ |
| 595 | me->ourgame->free_params(preset); |
| 596 | continue; |
| 597 | } |
| 598 | |
| 599 | if (me->presetsize <= me->npresets) { |
| 600 | me->presetsize = me->npresets + 10; |
| 601 | me->presets = sresize(me->presets, me->presetsize, |
| 602 | game_params *); |
| 603 | me->preset_names = sresize(me->preset_names, |
| 604 | me->presetsize, char *); |
| 605 | } |
| 606 | |
| 607 | me->presets[me->npresets] = preset; |
| 608 | me->preset_names[me->npresets] = name; |
| 609 | me->npresets++; |
| 610 | } |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | return me->npresets; |
| 615 | } |
| 616 | |
| 617 | void midend_fetch_preset(midend_data *me, int n, |
| 618 | char **name, game_params **params) |
| 619 | { |
| 620 | assert(n >= 0 && n < me->npresets); |
| 621 | *name = me->preset_names[n]; |
| 622 | *params = me->presets[n]; |
| 623 | } |
| 624 | |
| 625 | int midend_wants_statusbar(midend_data *me) |
| 626 | { |
| 627 | return me->ourgame->wants_statusbar(); |
| 628 | } |
| 629 | |
| 630 | void midend_supersede_game_desc(midend_data *me, char *desc) |
| 631 | { |
| 632 | sfree(me->desc); |
| 633 | me->desc = dupstr(desc); |
| 634 | } |
| 635 | |
| 636 | config_item *midend_get_config(midend_data *me, int which, char **wintitle) |
| 637 | { |
| 638 | char *titlebuf, *parstr; |
| 639 | config_item *ret; |
| 640 | |
| 641 | titlebuf = snewn(40 + strlen(me->ourgame->name), char); |
| 642 | |
| 643 | switch (which) { |
| 644 | case CFG_SETTINGS: |
| 645 | sprintf(titlebuf, "%s configuration", me->ourgame->name); |
| 646 | *wintitle = dupstr(titlebuf); |
| 647 | return me->ourgame->configure(me->params); |
| 648 | case CFG_SEED: |
| 649 | case CFG_DESC: |
| 650 | sprintf(titlebuf, "%s %s selection", me->ourgame->name, |
| 651 | which == CFG_SEED ? "random" : "game"); |
| 652 | *wintitle = dupstr(titlebuf); |
| 653 | |
| 654 | ret = snewn(2, config_item); |
| 655 | |
| 656 | ret[0].type = C_STRING; |
| 657 | if (which == CFG_SEED) |
| 658 | ret[0].name = "Game random seed"; |
| 659 | else |
| 660 | ret[0].name = "Game ID"; |
| 661 | ret[0].ival = 0; |
| 662 | /* |
| 663 | * For CFG_DESC the text going in here will be a string |
| 664 | * encoding of the restricted parameters, plus a colon, |
| 665 | * plus the game description. For CFG_SEED it will be the |
| 666 | * full parameters, plus a hash, plus the random seed data. |
| 667 | * Either of these is a valid full game ID (although only |
| 668 | * the former is likely to persist across many code |
| 669 | * changes). |
| 670 | */ |
| 671 | parstr = me->ourgame->encode_params(me->curparams, which == CFG_SEED); |
| 672 | if (which == CFG_DESC) { |
| 673 | ret[0].sval = snewn(strlen(parstr) + strlen(me->desc) + 2, char); |
| 674 | sprintf(ret[0].sval, "%s:%s", parstr, me->desc); |
| 675 | } else if (me->seedstr) { |
| 676 | ret[0].sval = snewn(strlen(parstr) + strlen(me->seedstr) + 2, char); |
| 677 | sprintf(ret[0].sval, "%s#%s", parstr, me->seedstr); |
| 678 | } else { |
| 679 | /* |
| 680 | * If the current game was not randomly generated, the |
| 681 | * best we can do is to give a template for typing a |
| 682 | * new seed in. |
| 683 | */ |
| 684 | ret[0].sval = snewn(strlen(parstr) + 2, char); |
| 685 | sprintf(ret[0].sval, "%s#", parstr); |
| 686 | } |
| 687 | sfree(parstr); |
| 688 | |
| 689 | ret[1].type = C_END; |
| 690 | ret[1].name = ret[1].sval = NULL; |
| 691 | ret[1].ival = 0; |
| 692 | |
| 693 | return ret; |
| 694 | } |
| 695 | |
| 696 | assert(!"We shouldn't be here"); |
| 697 | return NULL; |
| 698 | } |
| 699 | |
| 700 | static char *midend_game_id_int(midend_data *me, char *id, int defmode) |
| 701 | { |
| 702 | char *error, *par, *desc, *seed; |
| 703 | |
| 704 | seed = strchr(id, '#'); |
| 705 | desc = strchr(id, ':'); |
| 706 | |
| 707 | if (desc && (!seed || desc < seed)) { |
| 708 | /* |
| 709 | * We have a colon separating parameters from game |
| 710 | * description. So `par' now points to the parameters |
| 711 | * string, and `desc' to the description string. |
| 712 | */ |
| 713 | *desc++ = '\0'; |
| 714 | par = id; |
| 715 | seed = NULL; |
| 716 | } else if (seed && (!desc || seed < desc)) { |
| 717 | /* |
| 718 | * We have a hash separating parameters from random seed. |
| 719 | * So `par' now points to the parameters string, and `seed' |
| 720 | * to the seed string. |
| 721 | */ |
| 722 | *seed++ = '\0'; |
| 723 | par = id; |
| 724 | desc = NULL; |
| 725 | } else { |
| 726 | /* |
| 727 | * We only have one string. Depending on `defmode', we take |
| 728 | * it to be either parameters, seed or description. |
| 729 | */ |
| 730 | if (defmode == DEF_SEED) { |
| 731 | seed = id; |
| 732 | par = desc = NULL; |
| 733 | } else if (defmode == DEF_DESC) { |
| 734 | desc = id; |
| 735 | par = seed = NULL; |
| 736 | } else { |
| 737 | par = id; |
| 738 | seed = desc = NULL; |
| 739 | } |
| 740 | } |
| 741 | |
| 742 | if (par) { |
| 743 | game_params *tmpparams; |
| 744 | tmpparams = me->ourgame->dup_params(me->params); |
| 745 | me->ourgame->decode_params(tmpparams, par); |
| 746 | error = me->ourgame->validate_params(tmpparams); |
| 747 | if (error) { |
| 748 | me->ourgame->free_params(tmpparams); |
| 749 | return error; |
| 750 | } |
| 751 | if (me->curparams) |
| 752 | me->ourgame->free_params(me->curparams); |
| 753 | me->curparams = tmpparams; |
| 754 | |
| 755 | /* |
| 756 | * Now filter only the persistent parts of this state into |
| 757 | * the long-term params structure, unless we've _only_ |
| 758 | * received a params string in which case the whole lot is |
| 759 | * persistent. |
| 760 | */ |
| 761 | if (seed || desc) { |
| 762 | char *tmpstr = me->ourgame->encode_params(tmpparams, FALSE); |
| 763 | me->ourgame->decode_params(me->params, tmpstr); |
| 764 | sfree(tmpstr); |
| 765 | } else { |
| 766 | me->ourgame->free_params(me->params); |
| 767 | me->params = me->ourgame->dup_params(tmpparams); |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | sfree(me->desc); |
| 772 | me->desc = NULL; |
| 773 | sfree(me->seedstr); |
| 774 | me->seedstr = NULL; |
| 775 | |
| 776 | if (desc) { |
| 777 | error = me->ourgame->validate_desc(me->params, desc); |
| 778 | if (error) |
| 779 | return error; |
| 780 | |
| 781 | me->desc = dupstr(desc); |
| 782 | me->genmode = GOT_DESC; |
| 783 | if (me->aux_info) |
| 784 | me->ourgame->free_aux_info(me->aux_info); |
| 785 | me->aux_info = NULL; |
| 786 | } |
| 787 | |
| 788 | if (seed) { |
| 789 | me->seedstr = dupstr(seed); |
| 790 | me->genmode = GOT_SEED; |
| 791 | } |
| 792 | |
| 793 | return NULL; |
| 794 | } |
| 795 | |
| 796 | char *midend_game_id(midend_data *me, char *id) |
| 797 | { |
| 798 | return midend_game_id_int(me, id, DEF_PARAMS); |
| 799 | } |
| 800 | |
| 801 | char *midend_set_config(midend_data *me, int which, config_item *cfg) |
| 802 | { |
| 803 | char *error; |
| 804 | game_params *params; |
| 805 | |
| 806 | switch (which) { |
| 807 | case CFG_SETTINGS: |
| 808 | params = me->ourgame->custom_params(cfg); |
| 809 | error = me->ourgame->validate_params(params); |
| 810 | |
| 811 | if (error) { |
| 812 | me->ourgame->free_params(params); |
| 813 | return error; |
| 814 | } |
| 815 | |
| 816 | me->ourgame->free_params(me->params); |
| 817 | me->params = params; |
| 818 | break; |
| 819 | |
| 820 | case CFG_SEED: |
| 821 | case CFG_DESC: |
| 822 | error = midend_game_id_int(me, cfg[0].sval, |
| 823 | (which == CFG_SEED ? DEF_SEED : DEF_DESC)); |
| 824 | if (error) |
| 825 | return error; |
| 826 | break; |
| 827 | } |
| 828 | |
| 829 | return NULL; |
| 830 | } |
| 831 | |
| 832 | char *midend_text_format(midend_data *me) |
| 833 | { |
| 834 | if (me->ourgame->can_format_as_text && me->statepos > 0) |
| 835 | return me->ourgame->text_format(me->states[me->statepos-1].state); |
| 836 | else |
| 837 | return NULL; |
| 838 | } |
| 839 | |
| 840 | char *midend_solve(midend_data *me) |
| 841 | { |
| 842 | game_state *s; |
| 843 | char *msg; |
| 844 | |
| 845 | if (!me->ourgame->can_solve) |
| 846 | return "This game does not support the Solve operation"; |
| 847 | |
| 848 | if (me->statepos < 1) |
| 849 | return "No game set up to solve"; /* _shouldn't_ happen! */ |
| 850 | |
| 851 | msg = "Solve operation failed"; /* game _should_ overwrite on error */ |
| 852 | s = me->ourgame->solve(me->states[0].state, me->aux_info, &msg); |
| 853 | if (!s) |
| 854 | return msg; |
| 855 | |
| 856 | /* |
| 857 | * Now enter the solved state as the next move. |
| 858 | */ |
| 859 | midend_stop_anim(me); |
| 860 | while (me->nstates > me->statepos) |
| 861 | me->ourgame->free_game(me->states[--me->nstates].state); |
| 862 | ensure(me); |
| 863 | me->states[me->nstates].state = s; |
| 864 | me->states[me->nstates].special = TRUE; /* created using solve */ |
| 865 | me->statepos = ++me->nstates; |
| 866 | me->anim_time = 0.0; |
| 867 | midend_finish_move(me); |
| 868 | midend_redraw(me); |
| 869 | activate_timer(me->frontend); |
| 870 | return NULL; |
| 871 | } |