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     char *seed;
  17     int fresh_seed;
  18     int nstates, statesize, statepos;
  19
  20     game_params **presets;
  21     char **preset_names;
  22     int npresets, presetsize;
  23
  24     game_params *params;
  25     game_state **states;
  26     game_drawstate *drawstate;
  27     game_state *oldstate;
  28     float anim_time, anim_pos;
  29     float flash_time, flash_pos;
  30 };
  31
  32 #define ensure(me) do { \
  33     if ((me)->nstates >= (me)->statesize) { \
  34         (me)->statesize = (me)->nstates + 128; \
  35         (me)->states = sresize((me)->states, (me)->statesize, game_state *); \
  36     } \
  37 } while (0)
  38
  39 midend_data *midend_new(frontend *frontend)
  40 {
  41     midend_data *me = snew(midend_data);
  42
  43     me->frontend = frontend;
  44     me->nstates = me->statesize = me->statepos = 0;
  45     me->states = NULL;
  46     me->params = default_params();
  47     me->seed = NULL;
  48     me->fresh_seed = FALSE;
  49     me->drawstate = NULL;
  50     me->oldstate = NULL;
  51     me->presets = NULL;
  52     me->preset_names = NULL;
  53     me->npresets = me->presetsize = 0;
  54     me->anim_time = me->anim_pos = 0.0F;
  55     me->flash_time = me->flash_pos = 0.0F;
  56
  57     return me;
  58 }
  59
  60 void midend_free(midend_data *me)
  61 {
  62     sfree(me->states);
  63     sfree(me->seed);
  64     free_params(me->params);
  65     sfree(me);
  66 }
  67
  68 void midend_size(midend_data *me, int *x, int *y)
  69 {
  70     game_size(me->params, x, y);
  71 }
  72
  73 void midend_set_params(midend_data *me, game_params *params)
  74 {
  75     free_params(me->params);
  76     me->params = dup_params(params);
  77 }
  78
  79 void midend_new_game(midend_data *me)
  80 {
  81     while (me->nstates > 0)
  82         free_game(me->states[--me->nstates]);
  83
  84     if (me->drawstate)
  85         game_free_drawstate(me->drawstate);
  86
  87     assert(me->nstates == 0);
  88
  89     if (!me->fresh_seed) {
  90         sfree(me->seed);
  91         me->seed = new_game_seed(me->params);
  92     } else
  93         me->fresh_seed = FALSE;
  94
  95     ensure(me);
  96     me->states[me->nstates++] = new_game(me->params, me->seed);
  97     me->statepos = 1;
  98     me->drawstate = game_new_drawstate(me->states[0]);
  99 }
 100
 101 void midend_restart_game(midend_data *me)
 102 {
 103     while (me->nstates > 1)
 104         free_game(me->states[--me->nstates]);
 105     me->statepos = me->nstates;
 106 }
 107
 108 static int midend_undo(midend_data *me)
 109 {
 110     if (me->statepos > 1) {
 111         me->statepos--;
 112         return 1;
 113     } else
 114         return 0;
 115 }
 116
 117 static int midend_redo(midend_data *me)
 118 {
 119     if (me->statepos < me->nstates) {
 120         me->statepos++;
 121         return 1;
 122     } else
 123         return 0;
 124 }
 125
 126 static void midend_finish_move(midend_data *me)
 127 {
 128     float flashtime;
 129
 130     if (me->oldstate || me->statepos > 1) {
 131         flashtime = game_flash_length(me->oldstate ? me->oldstate :
 132                                       me->states[me->statepos-2],
 133                                       me->states[me->statepos-1]);
 134         if (flashtime > 0) {
 135             me->flash_pos = 0.0F;
 136             me->flash_time = flashtime;
 137         }
 138     }
 139
 140     if (me->oldstate)
 141         free_game(me->oldstate);
 142     me->oldstate = NULL;
 143     me->anim_pos = me->anim_time = 0;
 144
 145     if (me->flash_time == 0 && me->anim_time == 0)
 146         deactivate_timer(me->frontend);
 147     else
 148         activate_timer(me->frontend);
 149 }
 150
 151 int midend_process_key(midend_data *me, int x, int y, int button)
 152 {
 153     game_state *oldstate = dup_game(me->states[me->statepos - 1]);
 154     float anim_time;
 155
 156     if (me->oldstate || me->anim_time) {
 157         midend_finish_move(me);
 158         midend_redraw(me);
 159     }
 160
 161     if (button == 'n' || button == 'N' || button == '\x0E') {
 162         midend_new_game(me);
 163         midend_redraw(me);
 164         return 1;                      /* never animate */
 165     } else if (button == 'r' || button == 'R') {
 166         midend_restart_game(me);
 167         midend_redraw(me);
 168         return 1;                      /* never animate */
 169     } else if (button == 'u' || button == 'u' ||
 170                button == '\x1A' || button == '\x1F') {
 171         if (!midend_undo(me))
 172             return 1;
 173     } else if (button == '\x12') {
 174         if (!midend_redo(me))
 175             return 1;
 176     } else if (button == 'q' || button == 'Q' || button == '\x11') {
 177         free_game(oldstate);
 178         return 0;
 179     } else {
 180         game_state *s = make_move(me->states[me->statepos-1], x, y, button);
 181
 182         if (s) {
 183             while (me->nstates > me->statepos)
 184                 free_game(me->states[--me->nstates]);
 185             ensure(me);
 186             me->states[me->nstates] = s;
 187             me->statepos = ++me->nstates;
 188         } else {
 189             free_game(oldstate);
 190             return 1;
 191         }
 192     }
 193
 194     /*
 195      * See if this move requires an animation.
 196      */
 197     anim_time = game_anim_length(oldstate, me->states[me->statepos-1]);
 198
 199     me->oldstate = oldstate;
 200     if (anim_time > 0) {
 201         me->anim_time = anim_time;
 202     } else {
 203         me->anim_time = 0.0;
 204         midend_finish_move(me);
 205     }
 206     me->anim_pos = 0.0;
 207
 208     midend_redraw(me);
 209
 210     activate_timer(me->frontend);
 211
 212     return 1;
 213 }
 214
 215 void midend_redraw(midend_data *me)
 216 {
 217     if (me->statepos > 0 && me->drawstate) {
 218         start_draw(me->frontend);
 219         if (me->oldstate && me->anim_time > 0 &&
 220             me->anim_pos < me->anim_time) {
 221             game_redraw(me->frontend, me->drawstate, me->oldstate,
 222                         me->states[me->statepos-1], me->anim_pos,
 223                         me->flash_pos);
 224         } else {
 225             game_redraw(me->frontend, me->drawstate, NULL,
 226                         me->states[me->statepos-1], 0.0, me->flash_pos);
 227         }
 228         end_draw(me->frontend);
 229     }
 230 }
 231
 232 void midend_timer(midend_data *me, float tplus)
 233 {
 234     me->anim_pos += tplus;
 235     if (me->anim_pos >= me->anim_time ||
 236         me->anim_time == 0 || !me->oldstate) {
 237         if (me->anim_time > 0)
 238             midend_finish_move(me);
 239     }
 240     me->flash_pos += tplus;
 241     if (me->flash_pos >= me->flash_time || me->flash_time == 0) {
 242         me->flash_pos = me->flash_time = 0;
 243     }
 244     if (me->flash_time == 0 && me->anim_time == 0)
 245         deactivate_timer(me->frontend);
 246     midend_redraw(me);
 247 }
 248
 249 float *midend_colours(midend_data *me, int *ncolours)
 250 {
 251     game_state *state = NULL;
 252     float *ret;
 253
 254     if (me->nstates == 0) {
 255         char *seed = new_game_seed(me->params);
 256         state = new_game(me->params, seed);
 257         sfree(seed);
 258     } else
 259         state = me->states[0];
 260
 261     ret = game_colours(me->frontend, state, ncolours);
 262
 263     if (me->nstates == 0)
 264         free_game(state);
 265
 266     return ret;
 267 }
 268
 269 int midend_num_presets(midend_data *me)
 270 {
 271     if (!me->npresets) {
 272         char *name;
 273         game_params *preset;
 274
 275         while (game_fetch_preset(me->npresets, &name, &preset)) {
 276             if (me->presetsize <= me->npresets) {
 277                 me->presetsize = me->npresets + 10;
 278                 me->presets = sresize(me->presets, me->presetsize,
 279                                       game_params *);
 280                 me->preset_names = sresize(me->preset_names, me->presetsize,
 281                                            char *);
 282             }
 283
 284             me->presets[me->npresets] = preset;
 285             me->preset_names[me->npresets] = name;
 286             me->npresets++;
 287         }
 288     }
 289
 290     return me->npresets;
 291 }
 292
 293 void midend_fetch_preset(midend_data *me, int n,
 294                          char **name, game_params **params)
 295 {
 296     assert(n >= 0 && n < me->npresets);
 297     *name = me->preset_names[n];
 298     *params = me->presets[n];
 299 }
 300
 301 int midend_wants_statusbar(midend_data *me)
 302 {
 303     return game_wants_statusbar();
 304 }
 305
 306 config_item *midend_get_config(midend_data *me, int which, char **wintitle)
 307 {
 308     char *titlebuf;
 309     config_item *ret;
 310
 311     titlebuf = snewn(40 + strlen(game_name), char);
 312
 313     switch (which) {
 314       case CFG_SETTINGS:
 315         sprintf(titlebuf, "%s configuration", game_name);
 316         *wintitle = dupstr(titlebuf);
 317         return game_configure(me->params);
 318       case CFG_SEED:
 319         sprintf(titlebuf, "%s game selection", game_name);
 320         *wintitle = dupstr(titlebuf);
 321
 322         ret = snewn(2, config_item);
 323
 324         ret[0].type = C_STRING;
 325         ret[0].name = "Game ID";
 326         ret[0].ival = 0;
 327         ret[0].sval = dupstr(me->seed);
 328
 329         ret[1].type = C_END;
 330         ret[1].name = ret[1].sval = NULL;
 331         ret[1].ival = 0;
 332
 333         return ret;
 334     }
 335
 336     assert(!"We shouldn't be here");
 337     return NULL;
 338 }
 339
 340 char *midend_set_config(midend_data *me, int which, config_item *cfg)
 341 {
 342     char *error;
 343     game_params *params;
 344
 345     switch (which) {
 346       case CFG_SETTINGS:
 347         params = custom_params(cfg);
 348         error = validate_params(params);
 349
 350         if (error) {
 351             free_params(params);
 352             return error;
 353         }
 354
 355         free_params(me->params);
 356         me->params = params;
 357         break;
 358
 359       case CFG_SEED:
 360         error = validate_seed(me->params, cfg[0].sval);
 361         if (error)
 362             return error;
 363
 364         sfree(me->seed);
 365         me->seed = dupstr(cfg[0].sval);
 366         me->fresh_seed = TRUE;
 367
 368         break;
 369     }
 370
 371     return NULL;
 372 }