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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 WIDTH 500
#define HEIGHT 500
#define ANT_BPOS(ant) ((ant)->buffer[(ant)->posy * (ant)->width + (ant)->posx])
enum ant_direction {
NORTH,
EAST,
SOUTH,
WEST
};
typedef struct ant {
uint8_t *buffer;
char *actions;
uint16_t width, height;
uint16_t posx, posy;
enum ant_direction direction;
} Ant;
Ant *ant_new(uint16_t width, uint16_t height, char *actions)
{
Ant *ant = malloc(sizeof(Ant));
ant->buffer = calloc(sizeof(uint8_t), width * height);
ant->actions = strdup(actions);
ant->width = width;
ant->height = height;
ant->posx = width / 2;
ant->posy = width / 2;
ant->direction = NORTH;
return ant;
}
static void ant_del(Ant *ant)
{
free(ant->buffer);
free(ant->actions);
free(ant);
}
static inline void ant_left(Ant *ant)
{
ant->direction = ant->direction == 0 ? 3 : ant->direction - 1;
}
static inline void ant_right(Ant *ant)
{
ant->direction = ant->direction == 3 ? 0 : ant->direction + 1;
}
static inline void ant_forward(Ant *ant)
{
if (ant->direction & 1) { /* EAST or WEST */
ant->posx = ant->direction == EAST ? ant->posx + 1 : ant->posx - 1;
} else {
ant->posy = ant->direction == SOUTH ? ant->posy + 1 : ant->posy - 1;
}
}
void ant_simulate(Ant *ant)
{
uint8_t act_current = ANT_BPOS(ant);
uint8_t act_next = ant->actions[act_current + 1] != '\0' ? act_current + 1 : 0;
if (ant->actions[act_current] == 'L') {
ant_left(ant);
ANT_BPOS(ant) = act_next;
ant_forward(ant);
} else {
ant_right(ant);
ANT_BPOS(ant) = act_next;
ant_forward(ant);
}
}
int main(int argc, char **argv)
{
if (argc != 2) {
printf("Usage: ant <action string>\n");
exit(1);
}
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[2] = {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_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;
uint32_t step = 0;
Ant *ant = ant_new(WIDTH, HEIGHT, argv[1]);
putchar('\n');
while (1) {
printf("\rStep: %d", step++);
fflush(stdout);
limg = (uint32_t *)image->data;
for (int i = 0; i < WIDTH * HEIGHT; i++) {
uint32_t colour = 0;
colour |= (ant->buffer[i] & 1) * 0xFF << 0;
colour |= (ant->buffer[i] >> 1) * 0xFF << 8;
colour |= (ant->buffer[i] >> 2) * 0xFF << 16;
*(limg++) = colour;
}
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++;
ant_simulate(ant);
}
ant_del(ant);
return 0;
}
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