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#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_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_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;
}
/* draw line */
for (x = 0; x < DISP_WIDTH; x++) {
if (bit_get(bits[DISP_HEIGHT - goframes], x)) {
al_draw_filled_rectangle(
(float)x, (float)(DISP_HEIGHT - goframes),
(float)(x + 1), (float)(DISP_HEIGHT - goframes + 1),
al_map_rgb(255, 255, 255)
);
}
}
al_flip_display();
goframes--;
if (goframes == 0)
puts("next");
}
}
done:
if (d)
al_destroy_display(d);
if (t)
al_destroy_timer(t);
if (eq)
al_destroy_event_queue(eq);
return rval;
}
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