1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <allegro5/allegro5.h>
#include <allegro5/allegro_primitives.h>
#define DISP_WIDTH 960
#define DISP_HEIGHT 480
#define FPS 60.0
#define DO_INIT(check, desc) \
if (!(check)) { \
fprintf(stderr, "err: can't initialise %s\n", desc); \
rval = 1; \
goto done; \
}
static bool bit_get(uint8_t *bline, unsigned off)
{
return (bline[off / 8] >> (off % 8)) & 0x01;
}
static void bit_set(uint8_t *bline, unsigned off)
{
bline[off / 8] = (bline[off / 8] | (0x01 << (off % 8)) );
}
int main(int argc, char **argv)
{
int rval = 0;
unsigned goframes;
uint8_t bits[DISP_HEIGHT][DISP_WIDTH / 8];
uint8_t automaton = 0;
unsigned x, y;
ALLEGRO_DISPLAY *d = NULL;
ALLEGRO_BITMAP *b = NULL;
ALLEGRO_TIMER *t = NULL;
ALLEGRO_EVENT_QUEUE *eq = NULL;
ALLEGRO_EVENT e;
DO_INIT(al_init(), "allegro");
DO_INIT(al_init_primitives_addon(), "primitives");
DO_INIT(al_install_keyboard(), "keyboard");
DO_INIT(t = al_create_timer(1.0 / FPS), "timer");
DO_INIT(eq = al_create_event_queue(), "event queue");
al_set_new_display_option(ALLEGRO_SINGLE_BUFFER, 1, ALLEGRO_REQUIRE);
DO_INIT(d = al_create_display(DISP_WIDTH, DISP_HEIGHT), "display");
al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
DO_INIT(b = al_create_bitmap(DISP_WIDTH, 1), "buffer");
al_register_event_source(eq, al_get_keyboard_event_source());
al_register_event_source(eq, al_get_display_event_source(d));
al_register_event_source(eq, al_get_timer_event_source(t));
al_start_timer(t);
goframes = 0;
reset:
al_clear_to_color(al_map_rgb(0, 0, 0));
memset(bits, 0, DISP_HEIGHT * DISP_WIDTH / 8);
/* seed bit */
bit_set(bits[0], DISP_WIDTH / 2);
for (y = 0; y < DISP_HEIGHT - 1; y++) {
for (x = 1; x < DISP_WIDTH - 2; x++) {
if (
bit_get(&automaton,
bit_get(bits[y], x + 2)
+ bit_get(bits[y], x + 1) * 2
+ bit_get(bits[y], x) * 4
)
) {
bit_set(bits[y + 1], x + 1);
}
}
}
while(true) {
al_wait_for_event(eq, &e);
switch (e.type) {
case ALLEGRO_EVENT_DISPLAY_CLOSE:
goto done;
case ALLEGRO_EVENT_KEY_DOWN:
switch(e.keyboard.keycode) {
case ALLEGRO_KEY_UP:
automaton += 10;
printf("%d\n", automaton);
break;
case ALLEGRO_KEY_DOWN:
automaton -= 10;
printf("%d\n", automaton);
break;
case ALLEGRO_KEY_LEFT:
automaton -= 1;
printf("%d\n", automaton);
break;
case ALLEGRO_KEY_RIGHT:
automaton += 1;
printf("%d\n", automaton);
break;
case ALLEGRO_KEY_ENTER:
goframes = DISP_HEIGHT;
goto reset;
default:
continue;
}
case ALLEGRO_EVENT_TIMER:
if (goframes == 0) {
al_flip_display();
break;
}
al_lock_bitmap(b, ALLEGRO_PIXEL_FORMAT_ANY, ALLEGRO_LOCK_WRITEONLY);
al_set_target_bitmap(b);
/* draw line */
for (x = 0; x < DISP_WIDTH; x++) {
if (bit_get(bits[DISP_HEIGHT - goframes], x))
al_put_pixel(x, 0, al_map_rgb(255, 255, 255));
else
al_put_pixel(x, 0, al_map_rgb(0, 0, 0));
}
al_unlock_bitmap(b);
al_set_target_backbuffer(d);
al_draw_bitmap(b, 0, DISP_HEIGHT - goframes, 0);
al_flip_display();
goframes--;
if (goframes == 0)
puts("next");
}
}
done:
if (d)
al_destroy_display(d);
if (b)
al_destroy_bitmap(b);
if (t)
al_destroy_timer(t);
if (eq)
al_destroy_event_queue(eq);
return rval;
}
|
