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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>
#include <sodium.h>
#define BUF_W 512
#define BUF_H 512
#define SEED_BITS 4096
#define FPS 20.0
#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;
uint8_t bits1[BUF_H][BUF_W / 8] = {0};
uint8_t bits2[BUF_H][BUF_W / 8] = {0};
uint8_t framerate = 2;
unsigned goframes = 1;
unsigned x, y, sum;
bool pause = 1;
ALLEGRO_DISPLAY *d = NULL;
ALLEGRO_BITMAP *b = NULL;
ALLEGRO_TIMER *t = NULL;
ALLEGRO_EVENT_QUEUE *eq = NULL;
ALLEGRO_EVENT e;
DO_INIT(sodium_init() >= 0, "sodium");
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(2 * BUF_W, 2 * BUF_H), "display");
al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
DO_INIT(b = al_create_bitmap(BUF_W, BUF_H), "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);
reset:
memset(bits1, 0, sizeof(bits1));
for (x = 0; x < SEED_BITS; x++) {
bit_set(
bits1[randombytes_random() % BUF_H],
randombytes_random() % BUF_W
);
}
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_1:
puts("reset");
goto reset;
case ALLEGRO_KEY_2:
framerate = (framerate == 1 ? 8 : framerate / 2);
printf("fps: %.1f\n", FPS / ((float)framerate) );
break;
case ALLEGRO_KEY_ENTER:
pause = !pause;
printf("%s\n", pause ? "pause" : "play");
break;
default:
break;
}
break;
case ALLEGRO_EVENT_TIMER:
if (goframes > 1) {
goframes--;
break;
}
/* step */
if (!pause) {
memset(bits2, 0, sizeof(bits1));
for (y = 0; y < BUF_H; y++) {
for (x = 0; x < BUF_W; x++) {
sum =
bit_get(bits1[(y-1) % BUF_H], (x-1) % BUF_W)
+ bit_get(bits1[(y-1) % BUF_H], x )
+ bit_get(bits1[(y-1) % BUF_H], (x+1) % BUF_W)
+ bit_get(bits1[ y ], (x-1) % BUF_W)
+ bit_get(bits1[ y ], (x+1) % BUF_W)
+ bit_get(bits1[(y+1) % BUF_H], (x-1) % BUF_W)
+ bit_get(bits1[(y+1) % BUF_H], x )
+ bit_get(bits1[(y+1) % BUF_H], (x+1) % BUF_W)
;
if (sum == 3 || (bit_get(bits1[y], x) && sum == 2))
bit_set(bits2[y], x);
}
}
memcpy(bits1, bits2, sizeof(bits1));
}
/* draw frame */
al_lock_bitmap(b, ALLEGRO_PIXEL_FORMAT_ANY, ALLEGRO_LOCK_WRITEONLY);
al_set_target_bitmap(b);
for (y = 0; y < BUF_H; y++) {
for (x = 0; x < BUF_W; x++) {
if (bit_get(bits1[y], x))
al_put_pixel(x, y, al_map_rgb(255, 255, 255));
else
al_put_pixel(x, y, al_map_rgb(0, 0, 0));
}
}
al_unlock_bitmap(b);
al_set_target_backbuffer(d);
al_draw_scaled_bitmap(b, 0, 0, BUF_W, BUF_H, 0, 0, 2 * BUF_W, 2 * BUF_H, 0);
al_flip_display();
goframes = framerate;
}
}
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;
}
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