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 int midend_process_key(midend_data *me, int x, int y, int button)
 162 {
 163     game_state *oldstate = dup_game(me->states[me->statepos - 1]);
 164     float anim_time;
 165
 166     if (me->oldstate || me->anim_time) {
 167         midend_finish_move(me);
 168         midend_redraw(me);
 169     }
 170
 171     if (button == 'n' || button == 'N' || button == '\x0E') {
 172         midend_new_game(me);
 173         midend_redraw(me);
 174         return 1;                      /* never animate */
 175     } else if (button == 'r' || button == 'R') {
 176         midend_restart_game(me);
 177         midend_redraw(me);
 178         return 1;                      /* never animate */
 179     } else if (button == 'u' || button == 'u' ||
 180                button == '\x1A' || button == '\x1F') {
 181         if (!midend_undo(me))
 182             return 1;
 183     } else if (button == '\x12') {
 184         if (!midend_redo(me))
 185             return 1;
 186     } else if (button == 'q' || button == 'Q' || button == '\x11') {
 187         free_game(oldstate);
 188         return 0;
 189     } else {
 190         game_state *s = make_move(me->states[me->statepos-1], me->ui,
 191                                   x, y, button);
 192
 193         if (s == me->states[me->statepos-1]) {
 194             /*
 195              * make_move() is allowed to return its input state to
 196              * indicate that although no move has been made, the UI
 197              * state has been updated and a redraw is called for.
 198              */
 199             midend_redraw(me);
 200             return 1;
 201         } else if (s) {
 202             while (me->nstates > me->statepos)
 203                 free_game(me->states[--me->nstates]);
 204             ensure(me);
 205             me->states[me->nstates] = s;
 206             me->statepos = ++me->nstates;
 207         } else {
 208             free_game(oldstate);
 209             return 1;
 210         }
 211     }
 212
 213     /*
 214      * See if this move requires an animation.
 215      */
 216     anim_time = game_anim_length(oldstate, me->states[me->statepos-1]);
 217
 218     me->oldstate = oldstate;
 219     if (anim_time > 0) {
 220         me->anim_time = anim_time;
 221     } else {
 222         me->anim_time = 0.0;
 223         midend_finish_move(me);
 224     }
 225     me->anim_pos = 0.0;
 226
 227     midend_redraw(me);
 228
 229     activate_timer(me->frontend);
 230
 231     return 1;
 232 }
 233
 234 void midend_redraw(midend_data *me)
 235 {
 236     if (me->statepos > 0 && me->drawstate) {
 237         start_draw(me->frontend);
 238         if (me->oldstate && me->anim_time > 0 &&
 239             me->anim_pos < me->anim_time) {
 240             game_redraw(me->frontend, me->drawstate, me->oldstate,
 241                         me->states[me->statepos-1], me->ui, me->anim_pos,
 242                         me->flash_pos);
 243         } else {
 244             game_redraw(me->frontend, me->drawstate, NULL,
 245                         me->states[me->statepos-1], me->ui, 0.0,
 246                         me->flash_pos);
 247         }
 248         end_draw(me->frontend);
 249     }
 250 }
 251
 252 void midend_timer(midend_data *me, float tplus)
 253 {
 254     me->anim_pos += tplus;
 255     if (me->anim_pos >= me->anim_time ||
 256         me->anim_time == 0 || !me->oldstate) {
 257         if (me->anim_time > 0)
 258             midend_finish_move(me);
 259     }
 260     me->flash_pos += tplus;
 261     if (me->flash_pos >= me->flash_time || me->flash_time == 0) {
 262         me->flash_pos = me->flash_time = 0;
 263     }
 264     if (me->flash_time == 0 && me->anim_time == 0)
 265         deactivate_timer(me->frontend);
 266     midend_redraw(me);
 267 }
 268
 269 float *midend_colours(midend_data *me, int *ncolours)
 270 {
 271     game_state *state = NULL;
 272     float *ret;
 273
 274     if (me->nstates == 0) {
 275         char *seed = new_game_seed(me->params, me->random);
 276         state = new_game(me->params, seed);
 277         sfree(seed);
 278     } else
 279         state = me->states[0];
 280
 281     ret = game_colours(me->frontend, state, ncolours);
 282
 283     if (me->nstates == 0)
 284         free_game(state);
 285
 286     return ret;
 287 }
 288
 289 int midend_num_presets(midend_data *me)
 290 {
 291     if (!me->npresets) {
 292         char *name;
 293         game_params *preset;
 294
 295         while (game_fetch_preset(me->npresets, &name, &preset)) {
 296             if (me->presetsize <= me->npresets) {
 297                 me->presetsize = me->npresets + 10;
 298                 me->presets = sresize(me->presets, me->presetsize,
 299                                       game_params *);
 300                 me->preset_names = sresize(me->preset_names, me->presetsize,
 301                                            char *);
 302             }
 303
 304             me->presets[me->npresets] = preset;
 305             me->preset_names[me->npresets] = name;
 306             me->npresets++;
 307         }
 308     }
 309
 310     return me->npresets;
 311 }
 312
 313 void midend_fetch_preset(midend_data *me, int n,
 314                          char **name, game_params **params)
 315 {
 316     assert(n >= 0 && n < me->npresets);
 317     *name = me->preset_names[n];
 318     *params = me->presets[n];
 319 }
 320
 321 int midend_wants_statusbar(midend_data *me)
 322 {
 323     return game_wants_statusbar();
 324 }
 325
 326 config_item *midend_get_config(midend_data *me, int which, char **wintitle)
 327 {
 328     char *titlebuf;
 329     config_item *ret;
 330
 331     titlebuf = snewn(40 + strlen(game_name), char);
 332
 333     switch (which) {
 334       case CFG_SETTINGS:
 335         sprintf(titlebuf, "%s configuration", game_name);
 336         *wintitle = dupstr(titlebuf);
 337         return game_configure(me->params);
 338       case CFG_SEED:
 339         sprintf(titlebuf, "%s game selection", game_name);
 340         *wintitle = dupstr(titlebuf);
 341
 342         ret = snewn(2, config_item);
 343
 344         ret[0].type = C_STRING;
 345         ret[0].name = "Game ID";
 346         ret[0].ival = 0;
 347         ret[0].sval = dupstr(me->seed);
 348
 349         ret[1].type = C_END;
 350         ret[1].name = ret[1].sval = NULL;
 351         ret[1].ival = 0;
 352
 353         return ret;
 354     }
 355
 356     assert(!"We shouldn't be here");
 357     return NULL;
 358 }
 359
 360 char *midend_set_config(midend_data *me, int which, config_item *cfg)
 361 {
 362     char *error;
 363     game_params *params;
 364
 365     switch (which) {
 366       case CFG_SETTINGS:
 367         params = custom_params(cfg);
 368         error = validate_params(params);
 369
 370         if (error) {
 371             free_params(params);
 372             return error;
 373         }
 374
 375         free_params(me->params);
 376         me->params = params;
 377         break;
 378
 379       case CFG_SEED:
 380         error = validate_seed(me->params, cfg[0].sval);
 381         if (error)
 382             return error;
 383
 384         sfree(me->seed);
 385         me->seed = dupstr(cfg[0].sval);
 386         me->fresh_seed = TRUE;
 387
 388         break;
 389     }
 390
 391     return NULL;
 392 }