| 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 | } |