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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> |
9 | #include <assert.h> |
10 | |
11 | #include "puzzles.h" |
12 | |
13 | struct midend_data { |
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14 | frontend *frontend; |
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15 | char *seed; |
16 | int nstates, statesize, statepos; |
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17 | |
18 | game_params **presets; |
19 | char **preset_names; |
20 | int npresets, presetsize; |
21 | |
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22 | game_params *params; |
23 | game_state **states; |
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24 | game_drawstate *drawstate; |
25 | game_state *oldstate; |
26 | float anim_time, anim_pos; |
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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 | |
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36 | midend_data *midend_new(frontend *frontend) |
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37 | { |
38 | midend_data *me = snew(midend_data); |
39 | |
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40 | me->frontend = frontend; |
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41 | me->nstates = me->statesize = me->statepos = 0; |
42 | me->states = NULL; |
43 | me->params = default_params(); |
44 | me->seed = NULL; |
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45 | me->drawstate = NULL; |
46 | me->oldstate = NULL; |
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47 | me->presets = NULL; |
48 | me->preset_names = NULL; |
49 | me->npresets = me->presetsize = 0; |
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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); |
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70 | me->params = dup_params(params); |
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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 | |
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78 | if (me->drawstate) |
79 | game_free_drawstate(me->drawstate); |
80 | |
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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; |
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92 | me->drawstate = game_new_drawstate(me->states[0]); |
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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 | |
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102 | static int midend_undo(midend_data *me) |
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103 | { |
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104 | if (me->statepos > 1) { |
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105 | me->statepos--; |
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106 | return 1; |
107 | } else |
108 | return 0; |
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109 | } |
110 | |
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111 | static int midend_redo(midend_data *me) |
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112 | { |
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113 | if (me->statepos < me->nstates) { |
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114 | me->statepos++; |
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115 | return 1; |
116 | } else |
117 | return 0; |
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118 | } |
119 | |
120 | int midend_process_key(midend_data *me, int x, int y, int button) |
121 | { |
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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 | } |
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133 | |
134 | if (button == 'n' || button == 'N' || button == '\x0E') { |
135 | midend_new_game(me, NULL); |
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136 | midend_redraw(me); |
137 | return 1; /* never animate */ |
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138 | } else if (button == 'r' || button == 'R') { |
139 | midend_restart_game(me); |
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140 | midend_redraw(me); |
141 | return 1; /* never animate */ |
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142 | } else if (button == 'u' || button == 'u' || |
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143 | button == '\x1A' || button == '\x1F') { |
144 | if (!midend_undo(me)) |
145 | return 1; |
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146 | } else if (button == '\x12') { |
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147 | if (!midend_redo(me)) |
148 | return 1; |
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149 | } else if (button == 'q' || button == 'Q' || button == '\x11') { |
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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 | } |
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165 | } |
166 | |
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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; |
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179 | } |
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180 | me->anim_pos = 0.0; |
181 | |
182 | midend_redraw(me); |
183 | |
184 | activate_timer(me->frontend); |
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185 | |
186 | return 1; |
187 | } |
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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 | } |
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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 | } |