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