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/*
* Copyright (C) 2014 Tomasz Kramkowski <tk@the-tk.com>
*
* This program is free software. It is licensed under version 3 of the
* GNU General Public License.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see [http://www.gnu.org/licenses/].
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <xcb/xcb.h>
#include <xcb/xcb_image.h>
#define BOARD_WIDTH 500
#define BOARD_HEIGHT 500
#define PIXEL 1
#define WIDTH (BOARD_WIDTH * PIXEL)
#define HEIGHT (BOARD_HEIGHT * PIXEL)
#define GOL_CLAMP(pos, max) ((pos) < 0 ? (pos) + (max) : (pos) % (max))
#define GOL_CLAMPX(gol, pos) (GOL_CLAMP((pos), (gol)->width))
#define GOL_CLAMPY(gol, pos) (GOL_CLAMP((pos), (gol)->height))
#define GOL_RESOLVE_F(gol, x, y) ((gol)->buffers[(gol)->front][(GOL_CLAMPX(gol, x))\
+ (GOL_CLAMPY(gol, y)) * (gol)->width])
#define GOL_RESOLVE_B(gol, x, y) ((gol)->buffers[!(gol)->front][(GOL_CLAMPX(gol, x))\
+ (GOL_CLAMPY(gol, y)) * (gol)->width])
typedef struct gol_t {
uint32_t width, height;
bool *buffers[2];
uint8_t front;
} Gol;
Gol *gol_new(unsigned const int width, unsigned const int height)
{
Gol *gol = malloc(sizeof(Gol));
gol->width = width;
gol->height = height;
gol->front = 0;
gol->buffers[0] = malloc(width * height * sizeof(bool));
gol->buffers[1] = malloc(width * height * sizeof(bool));
return gol;
}
void gol_del(Gol *gol)
{
free(gol->buffers[0]);
free(gol->buffers[1]);
free(gol);
}
void gol_random(Gol *const gol, unsigned const int seed)
{
srand(seed);
for (uint32_t i = 0; i < gol->width * gol->height; i++)
gol->buffers[gol->front][i] = rand() < 0.5 * ((double)RAND_MAX + 1.0);
}
static uint8_t gol_neighbours(Gol *const gol, const int32_t x, const int32_t y)
{
uint8_t neighbours = 0;
for (int8_t dx = -1; dx <= 1; dx++)
for (int8_t dy = -1; dy <= 1; dy++)
if (!(dx == 0 && dy == 0) && GOL_RESOLVE_F(gol, x + dx, y + dy))
neighbours++;
return neighbours;
}
void gol_simulate(Gol *const gol)
{
for (uint32_t x = 0; x < gol->width; x++)
for (uint32_t y = 0; y < gol->height; y++) {
uint8_t neighbours = gol_neighbours(gol, x, y);
if (GOL_RESOLVE_F(gol, x, y)){
if (neighbours < 2)
GOL_RESOLVE_B(gol, x, y) = 0;
else if (neighbours <= 3)
GOL_RESOLVE_B(gol, x, y) = 1;
else
GOL_RESOLVE_B(gol, x, y) = 0;
} else {
if (neighbours == 3)
GOL_RESOLVE_B(gol, x, y) = 1;
else
GOL_RESOLVE_B(gol, x, y) = 0;
}
}
gol->front = !gol->front;
}
int main(int argc, char **argv)
{
xcb_connection_t *connection = xcb_connect(NULL, NULL);
xcb_screen_t *screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
uint32_t mask = XCB_CW_BACK_PIXEL;
uint32_t values[] = {screen->black_pixel};
xcb_drawable_t window = xcb_generate_id(connection);
xcb_create_window(connection,
24,
window,
screen->root,
0, 0,
WIDTH, HEIGHT,
1,
XCB_WINDOW_CLASS_INPUT_OUTPUT,
screen->root_visual,
mask, values);
xcb_change_property(connection, XCB_PROP_MODE_REPLACE, window,
XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 8,
strlen(argv[0]), argv[0]);
xcb_pixmap_t pixmap = xcb_generate_id(connection);
xcb_create_pixmap(connection,
24,
pixmap,
window,
WIDTH, HEIGHT);
uint8_t *img = malloc(WIDTH * HEIGHT * 4);
xcb_image_t *image = xcb_image_create(WIDTH, HEIGHT,
XCB_IMAGE_FORMAT_Z_PIXMAP,
8, 24, 32,
0,
XCB_IMAGE_ORDER_MSB_FIRST,
XCB_IMAGE_ORDER_LSB_FIRST,
img,
WIDTH * HEIGHT * 4,
img);
mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
values[0] = screen->black_pixel;
values[1] = 0xFFFFFF;
xcb_gcontext_t gc = xcb_generate_id(connection);
xcb_create_gc(connection,
gc,
pixmap,
mask, values);
xcb_image_put(connection, pixmap, gc, image, 0, 0, 0);
xcb_map_window(connection, window);
xcb_flush(connection);
uint8_t value = 0;
uint32_t *limg;
Gol *gol = gol_new(BOARD_WIDTH, BOARD_HEIGHT);
gol_random(gol, time(NULL));
while (1) {
limg = (uint32_t *)image->data;
for (int i = 0; i < BOARD_WIDTH * BOARD_HEIGHT; i++)
*(limg++) = gol->buffers[gol->front][i] ? 0x00FFFF00 : 0x00000000;
xcb_image_put(connection, pixmap, gc, image, 0, 0, 0);
xcb_copy_area(connection,
pixmap,
window,
gc,
0, 0,
0, 0,
WIDTH, HEIGHT);
xcb_flush(connection);
value++;
gol_simulate(gol);
}
return 0;
}
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