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 <assert.h>
  10
  11 #include "puzzles.h"
  12
  13 struct midend_data {
  14     frontend *frontend;
  15     char *seed;
  16     int nstates, statesize, statepos;
  17
  18     game_params **presets;
  19     char **preset_names;
  20     int npresets, presetsize;
  21
  22     game_params *params;
  23     game_state **states;
  24     game_drawstate *drawstate;
  25     game_state *oldstate;
  26     float anim_time, anim_pos;
  27 };
  28
  29 #define ensure(me) do { \
  30     if ((me)->nstates >= (me)->statesize) { \
  31         (me)->statesize = (me)->nstates + 128; \
  32         (me)->states = sresize((me)->states, (me)->statesize, game_state *); \
  33     } \
  34 } while (0)
  35
  36 midend_data *midend_new(frontend *frontend)
  37 {
  38     midend_data *me = snew(midend_data);
  39
  40     me->frontend = frontend;
  41     me->nstates = me->statesize = me->statepos = 0;
  42     me->states = NULL;
  43     me->params = default_params();
  44     me->seed = NULL;
  45     me->drawstate = NULL;
  46     me->oldstate = NULL;
  47     me->presets = NULL;
  48     me->preset_names = NULL;
  49     me->npresets = me->presetsize = 0;
  50
  51     return me;
  52 }
  53
  54 void midend_free(midend_data *me)
  55 {
  56     sfree(me->states);
  57     sfree(me->seed);
  58     free_params(me->params);
  59     sfree(me);
  60 }
  61
  62 void midend_size(midend_data *me, int *x, int *y)
  63 {
  64     game_size(me->params, x, y);
  65 }
  66
  67 void midend_set_params(midend_data *me, game_params *params)
  68 {
  69     free_params(me->params);
  70     me->params = dup_params(params);
  71 }
  72
  73 void midend_new_game(midend_data *me, char *seed)
  74 {
  75     while (me->nstates > 0)
  76         free_game(me->states[--me->nstates]);
  77
  78     if (me->drawstate)
  79         game_free_drawstate(me->drawstate);
  80
  81     assert(me->nstates == 0);
  82
  83     sfree(me->seed);
  84     if (seed)
  85         me->seed = dupstr(seed);
  86     else
  87         me->seed = new_game_seed(me->params);
  88
  89     ensure(me);
  90     me->states[me->nstates++] = new_game(me->params, me->seed);
  91     me->statepos = 1;
  92     me->drawstate = game_new_drawstate(me->states[0]);
  93 }
  94
  95 void midend_restart_game(midend_data *me)
  96 {
  97     while (me->nstates > 1)
  98         free_game(me->states[--me->nstates]);
  99     me->statepos = me->nstates;
 100 }
 101
 102 static int midend_undo(midend_data *me)
 103 {
 104     if (me->statepos > 1) {
 105         me->statepos--;
 106         return 1;
 107     } else
 108         return 0;
 109 }
 110
 111 static int midend_redo(midend_data *me)
 112 {
 113     if (me->statepos < me->nstates) {
 114         me->statepos++;
 115         return 1;
 116     } else
 117         return 0;
 118 }
 119
 120 int midend_process_key(midend_data *me, int x, int y, int button)
 121 {
 122     game_state *oldstate = dup_game(me->states[me->statepos - 1]);
 123     float anim_time;
 124
 125     if (me->oldstate || me->anim_time) {
 126         if (me->oldstate)
 127             free_game(me->oldstate);
 128         me->oldstate = NULL;
 129         me->anim_pos = me->anim_time = 0;
 130         deactivate_timer(me->frontend);
 131         midend_redraw(me);
 132     }
 133
 134     if (button == 'n' || button == 'N' || button == '\x0E') {
 135         midend_new_game(me, NULL);
 136         midend_redraw(me);
 137         return 1;                      /* never animate */
 138     } else if (button == 'r' || button == 'R') {
 139         midend_restart_game(me);
 140         midend_redraw(me);
 141         return 1;                      /* never animate */
 142     } else if (button == 'u' || button == 'u' ||
 143                button == '\x1A' || button == '\x1F') {
 144         if (!midend_undo(me))
 145             return 1;
 146     } else if (button == '\x12') {
 147         if (!midend_redo(me))
 148             return 1;
 149     } else if (button == 'q' || button == 'Q' || button == '\x11') {
 150         free_game(oldstate);
 151         return 0;
 152     } else {
 153         game_state *s = make_move(me->states[me->statepos-1], x, y, button);
 154
 155         if (s) {
 156             while (me->nstates > me->statepos)
 157                 free_game(me->states[--me->nstates]);
 158             ensure(me);
 159             me->states[me->nstates] = s;
 160             me->statepos = ++me->nstates;
 161         } else {
 162             free_game(oldstate);
 163             return 1;
 164         }
 165     }
 166
 167     /*
 168      * See if this move requires an animation.
 169      */
 170     anim_time = game_anim_length(oldstate, me->states[me->statepos-1]);
 171
 172     if (anim_time > 0) {
 173         me->oldstate = oldstate;
 174         me->anim_time = anim_time;
 175     } else {
 176         free_game(oldstate);
 177         me->oldstate = NULL;
 178         me->anim_time = 0.0;
 179     }
 180     me->anim_pos = 0.0;
 181
 182     midend_redraw(me);
 183
 184     activate_timer(me->frontend);
 185
 186     return 1;
 187 }
 188
 189 void midend_redraw(midend_data *me)
 190 {
 191     if (me->statepos > 0 && me->drawstate) {
 192         start_draw(me->frontend);
 193         if (me->oldstate && me->anim_time > 0 &&
 194             me->anim_pos < me->anim_time) {
 195             game_redraw(me->frontend, me->drawstate, me->oldstate,
 196                         me->states[me->statepos-1], me->anim_pos);
 197         } else {
 198             game_redraw(me->frontend, me->drawstate, NULL,
 199                         me->states[me->statepos-1], 0.0);
 200         }
 201         end_draw(me->frontend);
 202     }
 203 }
 204
 205 void midend_timer(midend_data *me, float tplus)
 206 {
 207     me->anim_pos += tplus;
 208     if (me->anim_pos >= me->anim_time ||
 209         me->anim_time == 0 || !me->oldstate) {
 210         if (me->oldstate)
 211             free_game(me->oldstate);
 212         me->oldstate = NULL;
 213         me->anim_pos = me->anim_time = 0;
 214         deactivate_timer(me->frontend);
 215     }
 216     midend_redraw(me);
 217 }
 218
 219 float *midend_colours(midend_data *me, int *ncolours)
 220 {
 221     game_state *state = NULL;
 222     float *ret;
 223
 224     if (me->nstates == 0) {
 225         char *seed = new_game_seed(me->params);
 226         state = new_game(me->params, seed);
 227         sfree(seed);
 228     } else
 229         state = me->states[0];
 230
 231     ret = game_colours(me->frontend, state, ncolours);
 232
 233     if (me->nstates == 0)
 234         free_game(state);
 235
 236     return ret;
 237 }
 238
 239 int midend_num_presets(midend_data *me)
 240 {
 241     if (!me->npresets) {
 242         char *name;
 243         game_params *preset;
 244
 245         while (game_fetch_preset(me->npresets, &name, &preset)) {
 246             if (me->presetsize <= me->npresets) {
 247                 me->presetsize = me->npresets + 10;
 248                 me->presets = sresize(me->presets, me->presetsize,
 249                                       game_params *);
 250                 me->preset_names = sresize(me->preset_names, me->presetsize,
 251                                            char *);
 252             }
 253
 254             me->presets[me->npresets] = preset;
 255             me->preset_names[me->npresets] = name;
 256             me->npresets++;
 257         }
 258     }
 259
 260     return me->npresets;
 261 }
 262
 263 void midend_fetch_preset(midend_data *me, int n,
 264                          char **name, game_params **params)
 265 {
 266     assert(n >= 0 && n < me->npresets);
 267     *name = me->preset_names[n];
 268     *params = me->presets[n];
 269 }