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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 | */ |
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7 | |
8 | #include <stdio.h> |
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9 | #include <string.h> |
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10 | #include <assert.h> |
11 | |
12 | #include "puzzles.h" |
13 | |
14 | struct midend_data { |
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15 | frontend *frontend; |
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16 | random_state *random; |
17 | |
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18 | char *seed; |
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19 | int fresh_seed; |
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20 | int nstates, statesize, statepos; |
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21 | |
22 | game_params **presets; |
23 | char **preset_names; |
24 | int npresets, presetsize; |
25 | |
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26 | game_params *params; |
27 | game_state **states; |
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28 | game_drawstate *drawstate; |
29 | game_state *oldstate; |
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30 | game_ui *ui; |
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31 | float anim_time, anim_pos; |
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32 | float flash_time, flash_pos; |
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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 | |
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42 | midend_data *midend_new(frontend *fe, void *randseed, int randseedsize) |
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43 | { |
44 | midend_data *me = snew(midend_data); |
45 | |
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46 | me->frontend = fe; |
47 | me->random = random_init(randseed, randseedsize); |
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48 | me->nstates = me->statesize = me->statepos = 0; |
49 | me->states = NULL; |
50 | me->params = default_params(); |
51 | me->seed = NULL; |
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52 | me->fresh_seed = FALSE; |
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53 | me->drawstate = NULL; |
54 | me->oldstate = NULL; |
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55 | me->presets = NULL; |
56 | me->preset_names = NULL; |
57 | me->npresets = me->presetsize = 0; |
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58 | me->anim_time = me->anim_pos = 0.0F; |
59 | me->flash_time = me->flash_pos = 0.0F; |
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60 | me->ui = NULL; |
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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); |
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81 | me->params = dup_params(params); |
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82 | } |
83 | |
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84 | void midend_new_game(midend_data *me) |
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85 | { |
86 | while (me->nstates > 0) |
87 | free_game(me->states[--me->nstates]); |
88 | |
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89 | if (me->drawstate) |
90 | game_free_drawstate(me->drawstate); |
91 | |
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92 | assert(me->nstates == 0); |
93 | |
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94 | if (!me->fresh_seed) { |
95 | sfree(me->seed); |
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96 | me->seed = new_game_seed(me->params, me->random); |
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97 | } else |
98 | me->fresh_seed = FALSE; |
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99 | |
100 | ensure(me); |
101 | me->states[me->nstates++] = new_game(me->params, me->seed); |
102 | me->statepos = 1; |
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103 | me->drawstate = game_new_drawstate(me->states[0]); |
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104 | if (me->ui) |
105 | free_ui(me->ui); |
106 | me->ui = new_ui(me->states[0]); |
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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; |
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114 | free_ui(me->ui); |
115 | me->ui = new_ui(me->states[0]); |
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116 | } |
117 | |
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118 | static int midend_undo(midend_data *me) |
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119 | { |
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120 | if (me->statepos > 1) { |
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121 | me->statepos--; |
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122 | return 1; |
123 | } else |
124 | return 0; |
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125 | } |
126 | |
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127 | static int midend_redo(midend_data *me) |
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128 | { |
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129 | if (me->statepos < me->nstates) { |
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130 | me->statepos++; |
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131 | return 1; |
132 | } else |
133 | return 0; |
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134 | } |
135 | |
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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 | |
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161 | int midend_process_key(midend_data *me, int x, int y, int button) |
162 | { |
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163 | game_state *oldstate = dup_game(me->states[me->statepos - 1]); |
164 | float anim_time; |
165 | |
166 | if (me->oldstate || me->anim_time) { |
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167 | midend_finish_move(me); |
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168 | midend_redraw(me); |
169 | } |
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170 | |
171 | if (button == 'n' || button == 'N' || button == '\x0E') { |
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172 | midend_new_game(me); |
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173 | midend_redraw(me); |
174 | return 1; /* never animate */ |
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175 | } else if (button == 'r' || button == 'R') { |
176 | midend_restart_game(me); |
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177 | midend_redraw(me); |
178 | return 1; /* never animate */ |
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179 | } else if (button == 'u' || button == 'u' || |
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180 | button == '\x1A' || button == '\x1F') { |
181 | if (!midend_undo(me)) |
182 | return 1; |
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183 | } else if (button == '\x12') { |
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184 | if (!midend_redo(me)) |
185 | return 1; |
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186 | } else if (button == 'q' || button == 'Q' || button == '\x11') { |
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187 | free_game(oldstate); |
188 | return 0; |
189 | } else { |
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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) { |
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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 | } |
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211 | } |
212 | |
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213 | /* |
214 | * See if this move requires an animation. |
215 | */ |
216 | anim_time = game_anim_length(oldstate, me->states[me->statepos-1]); |
217 | |
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218 | me->oldstate = oldstate; |
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219 | if (anim_time > 0) { |
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220 | me->anim_time = anim_time; |
221 | } else { |
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222 | me->anim_time = 0.0; |
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223 | midend_finish_move(me); |
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224 | } |
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225 | me->anim_pos = 0.0; |
226 | |
227 | midend_redraw(me); |
228 | |
229 | activate_timer(me->frontend); |
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230 | |
231 | return 1; |
232 | } |
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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, |
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241 | me->states[me->statepos-1], me->ui, me->anim_pos, |
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242 | me->flash_pos); |
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243 | } else { |
244 | game_redraw(me->frontend, me->drawstate, NULL, |
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245 | me->states[me->statepos-1], me->ui, 0.0, |
246 | me->flash_pos); |
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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) { |
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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; |
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263 | } |
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264 | if (me->flash_time == 0 && me->anim_time == 0) |
265 | deactivate_timer(me->frontend); |
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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) { |
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275 | char *seed = new_game_seed(me->params, me->random); |
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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 | } |
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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 | } |
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320 | |
321 | int midend_wants_statusbar(midend_data *me) |
322 | { |
323 | return game_wants_statusbar(); |
324 | } |
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325 | |
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326 | config_item *midend_get_config(midend_data *me, int which, char **wintitle) |
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327 | { |
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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; |
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358 | } |
359 | |
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360 | char *midend_set_config(midend_data *me, int which, config_item *cfg) |
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361 | { |
362 | char *error; |
363 | game_params *params; |
364 | |
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365 | switch (which) { |
366 | case CFG_SETTINGS: |
367 | params = custom_params(cfg); |
368 | error = validate_params(params); |
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369 | |
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370 | if (error) { |
371 | free_params(params); |
372 | return error; |
373 | } |
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374 | |
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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 | } |
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390 | |
391 | return NULL; |
392 | } |