mdw@git.distorted.org.uk Git - sgt/puzzles/blob - midend.c

   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/restart/quit.
   6  */
   7
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <assert.h>
  11
  12 #include "puzzles.h"
  13
  14 struct midend_data {
  15     frontend *frontend;
  16     random_state *random;
  17
  18     char *seed;
  19     int fresh_seed;
  20     int nstates, statesize, statepos;
  21
  22     game_params **presets;
  23     char **preset_names;
  24     int npresets, presetsize;
  25
  26     game_params *params;
  27     game_state **states;
  28     game_drawstate *drawstate;
  29     game_state *oldstate;
  30     game_ui *ui;
  31     float anim_time, anim_pos;
  32     float flash_time, flash_pos;
  33     int dir;
  34 };
  35
  36 #define ensure(me) do { \
  37     if ((me)->nstates >= (me)->statesize) { \
  38         (me)->statesize = (me)->nstates + 128; \
  39         (me)->states = sresize((me)->states, (me)->statesize, game_state *); \
  40     } \
  41 } while (0)
  42
  43 midend_data *midend_new(frontend *fe, void *randseed, int randseedsize)
  44 {
  45     midend_data *me = snew(midend_data);
  46
  47     me->frontend = fe;
  48     me->random = random_init(randseed, randseedsize);
  49     me->nstates = me->statesize = me->statepos = 0;
  50     me->states = NULL;
  51     me->params = default_params();
  52     me->seed = NULL;
  53     me->fresh_seed = FALSE;
  54     me->drawstate = NULL;
  55     me->oldstate = NULL;
  56     me->presets = NULL;
  57     me->preset_names = NULL;
  58     me->npresets = me->presetsize = 0;
  59     me->anim_time = me->anim_pos = 0.0F;
  60     me->flash_time = me->flash_pos = 0.0F;
  61     me->dir = 0;
  62     me->ui = NULL;
  63
  64     return me;
  65 }
  66
  67 void midend_free(midend_data *me)
  68 {
  69     sfree(me->states);
  70     sfree(me->seed);
  71     free_params(me->params);
  72     sfree(me);
  73 }
  74
  75 void midend_size(midend_data *me, int *x, int *y)
  76 {
  77     game_size(me->params, x, y);
  78 }
  79
  80 void midend_set_params(midend_data *me, game_params *params)
  81 {
  82     free_params(me->params);
  83     me->params = dup_params(params);
  84 }
  85
  86 void midend_new_game(midend_data *me)
  87 {
  88     while (me->nstates > 0)
  89         free_game(me->states[--me->nstates]);
  90
  91     if (me->drawstate)
  92         game_free_drawstate(me->drawstate);
  93
  94     assert(me->nstates == 0);
  95
  96     if (!me->fresh_seed) {
  97         sfree(me->seed);
  98         me->seed = new_game_seed(me->params, me->random);
  99     } else
 100         me->fresh_seed = FALSE;
 101
 102     ensure(me);
 103     me->states[me->nstates++] = new_game(me->params, me->seed);
 104     me->statepos = 1;
 105     me->drawstate = game_new_drawstate(me->states[0]);
 106     if (me->ui)
 107         free_ui(me->ui);
 108     me->ui = new_ui(me->states[0]);
 109 }
 110
 111 void midend_restart_game(midend_data *me)
 112 {
 113     while (me->nstates > 1)
 114         free_game(me->states[--me->nstates]);
 115     me->statepos = me->nstates;
 116     free_ui(me->ui);
 117     me->ui = new_ui(me->states[0]);
 118 }
 119
 120 static int midend_undo(midend_data *me)
 121 {
 122     if (me->statepos > 1) {
 123         me->statepos--;
 124         me->dir = -1;
 125         return 1;
 126     } else
 127         return 0;
 128 }
 129
 130 static int midend_redo(midend_data *me)
 131 {
 132     if (me->statepos < me->nstates) {
 133         me->statepos++;
 134         me->dir = +1;
 135         return 1;
 136     } else
 137         return 0;
 138 }
 139
 140 static void midend_finish_move(midend_data *me)
 141 {
 142     float flashtime;
 143
 144     if (me->oldstate || me->statepos > 1) {
 145         flashtime = game_flash_length(me->oldstate ? me->oldstate :
 146                                       me->states[me->statepos-2],
 147                                       me->states[me->statepos-1],
 148                                       me->oldstate ? me->dir : +1);
 149         if (flashtime > 0) {
 150             me->flash_pos = 0.0F;
 151             me->flash_time = flashtime;
 152         }
 153     }
 154
 155     if (me->oldstate)
 156         free_game(me->oldstate);
 157     me->oldstate = NULL;
 158     me->anim_pos = me->anim_time = 0;
 159     me->dir = 0;
 160
 161     if (me->flash_time == 0 && me->anim_time == 0)
 162         deactivate_timer(me->frontend);
 163     else
 164         activate_timer(me->frontend);
 165 }
 166
 167 static void midend_stop_anim(midend_data *me)
 168 {
 169     if (me->oldstate || me->anim_time) {
 170         midend_finish_move(me);
 171         midend_redraw(me);
 172     }
 173 }
 174
 175 int midend_process_key(midend_data *me, int x, int y, int button)
 176 {
 177     game_state *oldstate = dup_game(me->states[me->statepos - 1]);
 178     float anim_time;
 179
 180     if (button == 'n' || button == 'N' || button == '\x0E') {
 181         midend_stop_anim(me);
 182         midend_new_game(me);
 183         midend_redraw(me);
 184         return 1;                      /* never animate */
 185     } else if (button == 'r' || button == 'R') {
 186         midend_stop_anim(me);
 187         midend_restart_game(me);
 188         midend_redraw(me);
 189         return 1;                      /* never animate */
 190     } else if (button == 'u' || button == 'u' ||
 191                button == '\x1A' || button == '\x1F') {
 192         midend_stop_anim(me);
 193         if (!midend_undo(me))
 194             return 1;
 195     } else if (button == '\x12') {
 196         midend_stop_anim(me);
 197         if (!midend_redo(me))
 198             return 1;
 199     } else if (button == 'q' || button == 'Q' || button == '\x11') {
 200         free_game(oldstate);
 201         return 0;
 202     } else {
 203         game_state *s = make_move(me->states[me->statepos-1], me->ui,
 204                                   x, y, button);
 205
 206         if (s == me->states[me->statepos-1]) {
 207             /*
 208              * make_move() is allowed to return its input state to
 209              * indicate that although no move has been made, the UI
 210              * state has been updated and a redraw is called for.
 211              */
 212             midend_redraw(me);
 213             return 1;
 214         } else if (s) {
 215             midend_stop_anim(me);
 216             while (me->nstates > me->statepos)
 217                 free_game(me->states[--me->nstates]);
 218             ensure(me);
 219             me->states[me->nstates] = s;
 220             me->statepos = ++me->nstates;
 221             me->dir = +1;
 222         } else {
 223             free_game(oldstate);
 224             return 1;
 225         }
 226     }
 227
 228     /*
 229      * See if this move requires an animation.
 230      */
 231     anim_time = game_anim_length(oldstate, me->states[me->statepos-1], me->dir);
 232
 233     me->oldstate = oldstate;
 234     if (anim_time > 0) {
 235         me->anim_time = anim_time;
 236     } else {
 237         me->anim_time = 0.0;
 238         midend_finish_move(me);
 239     }
 240     me->anim_pos = 0.0;
 241
 242     midend_redraw(me);
 243
 244     activate_timer(me->frontend);
 245
 246     return 1;
 247 }
 248
 249 void midend_redraw(midend_data *me)
 250 {
 251     if (me->statepos > 0 && me->drawstate) {
 252         start_draw(me->frontend);
 253         if (me->oldstate && me->anim_time > 0 &&
 254             me->anim_pos < me->anim_time) {
 255             assert(me->dir != 0);
 256             game_redraw(me->frontend, me->drawstate, me->oldstate,
 257                         me->states[me->statepos-1], me->dir,
 258                         me->ui, me->anim_pos, me->flash_pos);
 259         } else {
 260             game_redraw(me->frontend, me->drawstate, NULL,
 261                         me->states[me->statepos-1], +1 /*shrug*/,
 262                         me->ui, 0.0, me->flash_pos);
 263         }
 264         end_draw(me->frontend);
 265     }
 266 }
 267
 268 void midend_timer(midend_data *me, float tplus)
 269 {
 270     me->anim_pos += tplus;
 271     if (me->anim_pos >= me->anim_time ||
 272         me->anim_time == 0 || !me->oldstate) {
 273         if (me->anim_time > 0)
 274             midend_finish_move(me);
 275     }
 276     me->flash_pos += tplus;
 277     if (me->flash_pos >= me->flash_time || me->flash_time == 0) {
 278         me->flash_pos = me->flash_time = 0;
 279     }
 280     if (me->flash_time == 0 && me->anim_time == 0)
 281         deactivate_timer(me->frontend);
 282     midend_redraw(me);
 283 }
 284
 285 float *midend_colours(midend_data *me, int *ncolours)
 286 {
 287     game_state *state = NULL;
 288     float *ret;
 289
 290     if (me->nstates == 0) {
 291         char *seed = new_game_seed(me->params, me->random);
 292         state = new_game(me->params, seed);
 293         sfree(seed);
 294     } else
 295         state = me->states[0];
 296
 297     ret = game_colours(me->frontend, state, ncolours);
 298
 299     if (me->nstates == 0)
 300         free_game(state);
 301
 302     return ret;
 303 }
 304
 305 int midend_num_presets(midend_data *me)
 306 {
 307     if (!me->npresets) {
 308         char *name;
 309         game_params *preset;
 310
 311         while (game_fetch_preset(me->npresets, &name, &preset)) {
 312             if (me->presetsize <= me->npresets) {
 313                 me->presetsize = me->npresets + 10;
 314                 me->presets = sresize(me->presets, me->presetsize,
 315                                       game_params *);
 316                 me->preset_names = sresize(me->preset_names, me->presetsize,
 317                                            char *);
 318             }
 319
 320             me->presets[me->npresets] = preset;
 321             me->preset_names[me->npresets] = name;
 322             me->npresets++;
 323         }
 324     }
 325
 326     return me->npresets;
 327 }
 328
 329 void midend_fetch_preset(midend_data *me, int n,
 330                          char **name, game_params **params)
 331 {
 332     assert(n >= 0 && n < me->npresets);
 333     *name = me->preset_names[n];
 334     *params = me->presets[n];
 335 }
 336
 337 int midend_wants_statusbar(midend_data *me)
 338 {
 339     return game_wants_statusbar();
 340 }
 341
 342 config_item *midend_get_config(midend_data *me, int which, char **wintitle)
 343 {
 344     char *titlebuf, *parstr;
 345     config_item *ret;
 346
 347     titlebuf = snewn(40 + strlen(game_name), char);
 348
 349     switch (which) {
 350       case CFG_SETTINGS:
 351         sprintf(titlebuf, "%s configuration", game_name);
 352         *wintitle = dupstr(titlebuf);
 353         return game_configure(me->params);
 354       case CFG_SEED:
 355         sprintf(titlebuf, "%s game selection", game_name);
 356         *wintitle = dupstr(titlebuf);
 357
 358         ret = snewn(2, config_item);
 359
 360         ret[0].type = C_STRING;
 361         ret[0].name = "Game ID";
 362         ret[0].ival = 0;
 363         /*
 364          * The text going in here will be a string encoding of the
 365          * parameters, plus a colon, plus the game seed. This is a
 366          * full game ID.
 367          */
 368         parstr = encode_params(me->params);
 369         ret[0].sval = snewn(strlen(parstr) + strlen(me->seed) + 2, char);
 370         sprintf(ret[0].sval, "%s:%s", parstr, me->seed);
 371         sfree(parstr);
 372
 373         ret[1].type = C_END;
 374         ret[1].name = ret[1].sval = NULL;
 375         ret[1].ival = 0;
 376
 377         return ret;
 378     }
 379
 380     assert(!"We shouldn't be here");
 381     return NULL;
 382 }
 383
 384 char *midend_game_id(midend_data *me, char *id, int def_seed)
 385 {
 386     char *error, *par, *seed;
 387     game_params *params;
 388
 389     seed = strchr(id, ':');
 390
 391     if (seed) {
 392         /*
 393          * We have a colon separating parameters from game seed. So
 394          * `par' now points to the parameters string, and `seed' to
 395          * the seed string.
 396          */
 397         *seed++ = '\0';
 398         par = id;
 399     } else {
 400         /*
 401          * We only have one string. Depending on `def_seed', we
 402          * take it to be either parameters or seed.
 403          */
 404         if (def_seed) {
 405             seed = id;
 406             par = NULL;
 407         } else {
 408             seed = NULL;
 409             par = id;
 410         }
 411     }
 412
 413     if (par) {
 414         params = decode_params(par);
 415         error = validate_params(params);
 416         if (error) {
 417             free_params(params);
 418             return error;
 419         }
 420         free_params(me->params);
 421         me->params = params;
 422     }
 423
 424     if (seed) {
 425         error = validate_seed(me->params, seed);
 426         if (error)
 427             return error;
 428
 429         sfree(me->seed);
 430         me->seed = dupstr(seed);
 431         me->fresh_seed = TRUE;
 432     }
 433
 434     return NULL;
 435 }
 436
 437 char *midend_set_config(midend_data *me, int which, config_item *cfg)
 438 {
 439     char *error;
 440     game_params *params;
 441
 442     switch (which) {
 443       case CFG_SETTINGS:
 444         params = custom_params(cfg);
 445         error = validate_params(params);
 446
 447         if (error) {
 448             free_params(params);
 449             return error;
 450         }
 451
 452         free_params(me->params);
 453         me->params = params;
 454         break;
 455
 456       case CFG_SEED:
 457         error = midend_game_id(me, cfg[0].sval, TRUE);
 458         if (error)
 459             return error;
 460         break;
 461     }
 462
 463     return NULL;
 464 }