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)
  44 {
  45     midend_data *me = snew(midend_data);
  46     void *randseed;
  47     int randseedsize;
  48
  49     get_random_seed(&randseed, &randseedsize);
  50
  51     me->frontend = fe;
  52     me->random = random_init(randseed, randseedsize);
  53     me->nstates = me->statesize = me->statepos = 0;
  54     me->states = NULL;
  55     me->params = default_params();
  56     me->seed = NULL;
  57     me->fresh_seed = FALSE;
  58     me->drawstate = NULL;
  59     me->oldstate = NULL;
  60     me->presets = NULL;
  61     me->preset_names = NULL;
  62     me->npresets = me->presetsize = 0;
  63     me->anim_time = me->anim_pos = 0.0F;
  64     me->flash_time = me->flash_pos = 0.0F;
  65     me->dir = 0;
  66     me->ui = NULL;
  67
  68     sfree(randseed);
  69
  70     return me;
  71 }
  72
  73 void midend_free(midend_data *me)
  74 {
  75     sfree(me->states);
  76     sfree(me->seed);
  77     free_params(me->params);
  78     sfree(me);
  79 }
  80
  81 void midend_size(midend_data *me, int *x, int *y)
  82 {
  83     game_size(me->params, x, y);
  84 }
  85
  86 void midend_set_params(midend_data *me, game_params *params)
  87 {
  88     free_params(me->params);
  89     me->params = dup_params(params);
  90 }
  91
  92 void midend_new_game(midend_data *me)
  93 {
  94     while (me->nstates > 0)
  95         free_game(me->states[--me->nstates]);
  96
  97     if (me->drawstate)
  98         game_free_drawstate(me->drawstate);
  99
 100     assert(me->nstates == 0);
 101
 102     if (!me->fresh_seed) {
 103         sfree(me->seed);
 104         me->seed = new_game_seed(me->params, me->random);
 105     } else
 106         me->fresh_seed = FALSE;
 107
 108     ensure(me);
 109     me->states[me->nstates++] = new_game(me->params, me->seed);
 110     me->statepos = 1;
 111     me->drawstate = game_new_drawstate(me->states[0]);
 112     if (me->ui)
 113         free_ui(me->ui);
 114     me->ui = new_ui(me->states[0]);
 115 }
 116
 117 void midend_restart_game(midend_data *me)
 118 {
 119     while (me->nstates > 1)
 120         free_game(me->states[--me->nstates]);
 121     me->statepos = me->nstates;
 122     free_ui(me->ui);
 123     me->ui = new_ui(me->states[0]);
 124 }
 125
 126 static int midend_undo(midend_data *me)
 127 {
 128     if (me->statepos > 1) {
 129         me->statepos--;
 130         me->dir = -1;
 131         return 1;
 132     } else
 133         return 0;
 134 }
 135
 136 static int midend_redo(midend_data *me)
 137 {
 138     if (me->statepos < me->nstates) {
 139         me->statepos++;
 140         me->dir = +1;
 141         return 1;
 142     } else
 143         return 0;
 144 }
 145
 146 static void midend_finish_move(midend_data *me)
 147 {
 148     float flashtime;
 149
 150     if (me->oldstate || me->statepos > 1) {
 151         flashtime = game_flash_length(me->oldstate ? me->oldstate :
 152                                       me->states[me->statepos-2],
 153                                       me->states[me->statepos-1],
 154                                       me->oldstate ? me->dir : +1);
 155         if (flashtime > 0) {
 156             me->flash_pos = 0.0F;
 157             me->flash_time = flashtime;
 158         }
 159     }
 160
 161     if (me->oldstate)
 162         free_game(me->oldstate);
 163     me->oldstate = NULL;
 164     me->anim_pos = me->anim_time = 0;
 165     me->dir = 0;
 166
 167     if (me->flash_time == 0 && me->anim_time == 0)
 168         deactivate_timer(me->frontend);
 169     else
 170         activate_timer(me->frontend);
 171 }
 172
 173 static void midend_stop_anim(midend_data *me)
 174 {
 175     if (me->oldstate || me->anim_time) {
 176         midend_finish_move(me);
 177         midend_redraw(me);
 178     }
 179 }
 180
 181 int midend_process_key(midend_data *me, int x, int y, int button)
 182 {
 183     game_state *oldstate = dup_game(me->states[me->statepos - 1]);
 184     float anim_time;
 185
 186     if (button == 'n' || button == 'N' || button == '\x0E') {
 187         midend_stop_anim(me);
 188         midend_new_game(me);
 189         midend_redraw(me);
 190         return 1;                      /* never animate */
 191     } else if (button == 'r' || button == 'R') {
 192         midend_stop_anim(me);
 193         midend_restart_game(me);
 194         midend_redraw(me);
 195         return 1;                      /* never animate */
 196     } else if (button == 'u' || button == 'u' ||
 197                button == '\x1A' || button == '\x1F') {
 198         midend_stop_anim(me);
 199         if (!midend_undo(me))
 200             return 1;
 201     } else if (button == '\x12') {
 202         midend_stop_anim(me);
 203         if (!midend_redo(me))
 204             return 1;
 205     } else if (button == 'q' || button == 'Q' || button == '\x11') {
 206         free_game(oldstate);
 207         return 0;
 208     } else {
 209         game_state *s = make_move(me->states[me->statepos-1], me->ui,
 210                                   x, y, button);
 211
 212         if (s == me->states[me->statepos-1]) {
 213             /*
 214              * make_move() is allowed to return its input state to
 215              * indicate that although no move has been made, the UI
 216              * state has been updated and a redraw is called for.
 217              */
 218             midend_redraw(me);
 219             return 1;
 220         } else if (s) {
 221             midend_stop_anim(me);
 222             while (me->nstates > me->statepos)
 223                 free_game(me->states[--me->nstates]);
 224             ensure(me);
 225             me->states[me->nstates] = s;
 226             me->statepos = ++me->nstates;
 227             me->dir = +1;
 228         } else {
 229             free_game(oldstate);
 230             return 1;
 231         }
 232     }
 233
 234     /*
 235      * See if this move requires an animation.
 236      */
 237     anim_time = game_anim_length(oldstate, me->states[me->statepos-1], me->dir);
 238
 239     me->oldstate = oldstate;
 240     if (anim_time > 0) {
 241         me->anim_time = anim_time;
 242     } else {
 243         me->anim_time = 0.0;
 244         midend_finish_move(me);
 245     }
 246     me->anim_pos = 0.0;
 247
 248     midend_redraw(me);
 249
 250     activate_timer(me->frontend);
 251
 252     return 1;
 253 }
 254
 255 void midend_redraw(midend_data *me)
 256 {
 257     if (me->statepos > 0 && me->drawstate) {
 258         start_draw(me->frontend);
 259         if (me->oldstate && me->anim_time > 0 &&
 260             me->anim_pos < me->anim_time) {
 261             assert(me->dir != 0);
 262             game_redraw(me->frontend, me->drawstate, me->oldstate,
 263                         me->states[me->statepos-1], me->dir,
 264                         me->ui, me->anim_pos, me->flash_pos);
 265         } else {
 266             game_redraw(me->frontend, me->drawstate, NULL,
 267                         me->states[me->statepos-1], +1 /*shrug*/,
 268                         me->ui, 0.0, me->flash_pos);
 269         }
 270         end_draw(me->frontend);
 271     }
 272 }
 273
 274 void midend_timer(midend_data *me, float tplus)
 275 {
 276     me->anim_pos += tplus;
 277     if (me->anim_pos >= me->anim_time ||
 278         me->anim_time == 0 || !me->oldstate) {
 279         if (me->anim_time > 0)
 280             midend_finish_move(me);
 281     }
 282     me->flash_pos += tplus;
 283     if (me->flash_pos >= me->flash_time || me->flash_time == 0) {
 284         me->flash_pos = me->flash_time = 0;
 285     }
 286     if (me->flash_time == 0 && me->anim_time == 0)
 287         deactivate_timer(me->frontend);
 288     midend_redraw(me);
 289 }
 290
 291 float *midend_colours(midend_data *me, int *ncolours)
 292 {
 293     game_state *state = NULL;
 294     float *ret;
 295
 296     if (me->nstates == 0) {
 297         char *seed = new_game_seed(me->params, me->random);
 298         state = new_game(me->params, seed);
 299         sfree(seed);
 300     } else
 301         state = me->states[0];
 302
 303     ret = game_colours(me->frontend, state, ncolours);
 304
 305     if (me->nstates == 0)
 306         free_game(state);
 307
 308     return ret;
 309 }
 310
 311 int midend_num_presets(midend_data *me)
 312 {
 313     if (!me->npresets) {
 314         char *name;
 315         game_params *preset;
 316
 317         while (game_fetch_preset(me->npresets, &name, &preset)) {
 318             if (me->presetsize <= me->npresets) {
 319                 me->presetsize = me->npresets + 10;
 320                 me->presets = sresize(me->presets, me->presetsize,
 321                                       game_params *);
 322                 me->preset_names = sresize(me->preset_names, me->presetsize,
 323                                            char *);
 324             }
 325
 326             me->presets[me->npresets] = preset;
 327             me->preset_names[me->npresets] = name;
 328             me->npresets++;
 329         }
 330     }
 331
 332     return me->npresets;
 333 }
 334
 335 void midend_fetch_preset(midend_data *me, int n,
 336                          char **name, game_params **params)
 337 {
 338     assert(n >= 0 && n < me->npresets);
 339     *name = me->preset_names[n];
 340     *params = me->presets[n];
 341 }
 342
 343 int midend_wants_statusbar(midend_data *me)
 344 {
 345     return game_wants_statusbar();
 346 }
 347
 348 config_item *midend_get_config(midend_data *me, int which, char **wintitle)
 349 {
 350     char *titlebuf, *parstr;
 351     config_item *ret;
 352
 353     titlebuf = snewn(40 + strlen(game_name), char);
 354
 355     switch (which) {
 356       case CFG_SETTINGS:
 357         sprintf(titlebuf, "%s configuration", game_name);
 358         *wintitle = dupstr(titlebuf);
 359         return game_configure(me->params);
 360       case CFG_SEED:
 361         sprintf(titlebuf, "%s game selection", game_name);
 362         *wintitle = dupstr(titlebuf);
 363
 364         ret = snewn(2, config_item);
 365
 366         ret[0].type = C_STRING;
 367         ret[0].name = "Game ID";
 368         ret[0].ival = 0;
 369         /*
 370          * The text going in here will be a string encoding of the
 371          * parameters, plus a colon, plus the game seed. This is a
 372          * full game ID.
 373          */
 374         parstr = encode_params(me->params);
 375         ret[0].sval = snewn(strlen(parstr) + strlen(me->seed) + 2, char);
 376         sprintf(ret[0].sval, "%s:%s", parstr, me->seed);
 377         sfree(parstr);
 378
 379         ret[1].type = C_END;
 380         ret[1].name = ret[1].sval = NULL;
 381         ret[1].ival = 0;
 382
 383         return ret;
 384     }
 385
 386     assert(!"We shouldn't be here");
 387     return NULL;
 388 }
 389
 390 char *midend_game_id(midend_data *me, char *id, int def_seed)
 391 {
 392     char *error, *par, *seed;
 393     game_params *params;
 394
 395     seed = strchr(id, ':');
 396
 397     if (seed) {
 398         /*
 399          * We have a colon separating parameters from game seed. So
 400          * `par' now points to the parameters string, and `seed' to
 401          * the seed string.
 402          */
 403         *seed++ = '\0';
 404         par = id;
 405     } else {
 406         /*
 407          * We only have one string. Depending on `def_seed', we
 408          * take it to be either parameters or seed.
 409          */
 410         if (def_seed) {
 411             seed = id;
 412             par = NULL;
 413         } else {
 414             seed = NULL;
 415             par = id;
 416         }
 417     }
 418
 419     if (par) {
 420         params = decode_params(par);
 421         error = validate_params(params);
 422         if (error) {
 423             free_params(params);
 424             return error;
 425         }
 426         free_params(me->params);
 427         me->params = params;
 428     }
 429
 430     if (seed) {
 431         error = validate_seed(me->params, seed);
 432         if (error)
 433             return error;
 434
 435         sfree(me->seed);
 436         me->seed = dupstr(seed);
 437         me->fresh_seed = TRUE;
 438     }
 439
 440     return NULL;
 441 }
 442
 443 char *midend_set_config(midend_data *me, int which, config_item *cfg)
 444 {
 445     char *error;
 446     game_params *params;
 447
 448     switch (which) {
 449       case CFG_SETTINGS:
 450         params = custom_params(cfg);
 451         error = validate_params(params);
 452
 453         if (error) {
 454             free_params(params);
 455             return error;
 456         }
 457
 458         free_params(me->params);
 459         me->params = params;
 460         break;
 461
 462       case CFG_SEED:
 463         error = midend_game_id(me, cfg[0].sval, TRUE);
 464         if (error)
 465             return error;
 466         break;
 467     }
 468
 469     return NULL;
 470 }