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