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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 | |
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94 | static int midend_undo(midend_data *me) |
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95 | { |
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96 | if (me->statepos > 1) { |
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97 | me->statepos--; |
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98 | return 1; |
99 | } else |
100 | return 0; |
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101 | } |
102 | |
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103 | static int midend_redo(midend_data *me) |
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104 | { |
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105 | if (me->statepos < me->nstates) { |
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106 | me->statepos++; |
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107 | return 1; |
108 | } else |
109 | return 0; |
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110 | } |
111 | |
112 | int midend_process_key(midend_data *me, int x, int y, int button) |
113 | { |
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114 | game_state *oldstate = dup_game(me->states[me->statepos - 1]); |
115 | float anim_time; |
116 | |
117 | if (me->oldstate || me->anim_time) { |
118 | if (me->oldstate) |
119 | free_game(me->oldstate); |
120 | me->oldstate = NULL; |
121 | me->anim_pos = me->anim_time = 0; |
122 | deactivate_timer(me->frontend); |
123 | midend_redraw(me); |
124 | } |
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125 | |
126 | if (button == 'n' || button == 'N' || button == '\x0E') { |
127 | midend_new_game(me, NULL); |
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128 | midend_redraw(me); |
129 | return 1; /* never animate */ |
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130 | } else if (button == 'r' || button == 'R') { |
131 | midend_restart_game(me); |
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132 | midend_redraw(me); |
133 | return 1; /* never animate */ |
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134 | } else if (button == 'u' || button == 'u' || |
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135 | button == '\x1A' || button == '\x1F') { |
136 | if (!midend_undo(me)) |
137 | return 1; |
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138 | } else if (button == '\x12') { |
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139 | if (!midend_redo(me)) |
140 | return 1; |
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141 | } else if (button == 'q' || button == 'Q' || button == '\x11') { |
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142 | free_game(oldstate); |
143 | return 0; |
144 | } else { |
145 | game_state *s = make_move(me->states[me->statepos-1], x, y, button); |
146 | |
147 | if (s) { |
148 | while (me->nstates > me->statepos) |
149 | free_game(me->states[--me->nstates]); |
150 | ensure(me); |
151 | me->states[me->nstates] = s; |
152 | me->statepos = ++me->nstates; |
153 | } else { |
154 | free_game(oldstate); |
155 | return 1; |
156 | } |
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157 | } |
158 | |
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159 | /* |
160 | * See if this move requires an animation. |
161 | */ |
162 | anim_time = game_anim_length(oldstate, me->states[me->statepos-1]); |
163 | |
164 | if (anim_time > 0) { |
165 | me->oldstate = oldstate; |
166 | me->anim_time = anim_time; |
167 | } else { |
168 | free_game(oldstate); |
169 | me->oldstate = NULL; |
170 | me->anim_time = 0.0; |
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171 | } |
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172 | me->anim_pos = 0.0; |
173 | |
174 | midend_redraw(me); |
175 | |
176 | activate_timer(me->frontend); |
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177 | |
178 | return 1; |
179 | } |
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180 | |
181 | void midend_redraw(midend_data *me) |
182 | { |
183 | if (me->statepos > 0 && me->drawstate) { |
184 | start_draw(me->frontend); |
185 | if (me->oldstate && me->anim_time > 0 && |
186 | me->anim_pos < me->anim_time) { |
187 | game_redraw(me->frontend, me->drawstate, me->oldstate, |
188 | me->states[me->statepos-1], me->anim_pos); |
189 | } else { |
190 | game_redraw(me->frontend, me->drawstate, NULL, |
191 | me->states[me->statepos-1], 0.0); |
192 | } |
193 | end_draw(me->frontend); |
194 | } |
195 | } |
196 | |
197 | void midend_timer(midend_data *me, float tplus) |
198 | { |
199 | me->anim_pos += tplus; |
200 | if (me->anim_pos >= me->anim_time || |
201 | me->anim_time == 0 || !me->oldstate) { |
202 | if (me->oldstate) |
203 | free_game(me->oldstate); |
204 | me->oldstate = NULL; |
205 | me->anim_pos = me->anim_time = 0; |
206 | deactivate_timer(me->frontend); |
207 | } |
208 | midend_redraw(me); |
209 | } |
210 | |
211 | float *midend_colours(midend_data *me, int *ncolours) |
212 | { |
213 | game_state *state = NULL; |
214 | float *ret; |
215 | |
216 | if (me->nstates == 0) { |
217 | char *seed = new_game_seed(me->params); |
218 | state = new_game(me->params, seed); |
219 | sfree(seed); |
220 | } else |
221 | state = me->states[0]; |
222 | |
223 | ret = game_colours(me->frontend, state, ncolours); |
224 | |
225 | if (me->nstates == 0) |
226 | free_game(state); |
227 | |
228 | return ret; |
229 | } |