| 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; |
| 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 | ret[0].sval = dupstr(me->seed); |
| 356 | |
| 357 | ret[1].type = C_END; |
| 358 | ret[1].name = ret[1].sval = NULL; |
| 359 | ret[1].ival = 0; |
| 360 | |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | assert(!"We shouldn't be here"); |
| 365 | return NULL; |
| 366 | } |
| 367 | |
| 368 | char *midend_set_config(midend_data *me, int which, config_item *cfg) |
| 369 | { |
| 370 | char *error; |
| 371 | game_params *params; |
| 372 | |
| 373 | switch (which) { |
| 374 | case CFG_SETTINGS: |
| 375 | params = custom_params(cfg); |
| 376 | error = validate_params(params); |
| 377 | |
| 378 | if (error) { |
| 379 | free_params(params); |
| 380 | return error; |
| 381 | } |
| 382 | |
| 383 | free_params(me->params); |
| 384 | me->params = params; |
| 385 | break; |
| 386 | |
| 387 | case CFG_SEED: |
| 388 | error = validate_seed(me->params, cfg[0].sval); |
| 389 | if (error) |
| 390 | return error; |
| 391 | |
| 392 | sfree(me->seed); |
| 393 | me->seed = dupstr(cfg[0].sval); |
| 394 | me->fresh_seed = TRUE; |
| 395 | |
| 396 | break; |
| 397 | } |
| 398 | |
| 399 | return NULL; |
| 400 | } |