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#include <SDL2/SDL.h>
#include <stdlib.h>
#define UP 0
#define DOWN 1
#define LEFT 2
#define RIGHT 3
int pos(int x, int y, int width, int height) {
return (x % width) + (y % height) * width;
}
int main() {
SDL_Init(SDL_INIT_VIDEO);
SDL_Window *win = SDL_CreateWindow("Snek automata", 0, 0, 800, 600, 0);
SDL_Renderer *ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
int width = 40;
int height = 20;
int *grid = calloc(width * height, sizeof(int));
int direction = RIGHT;
int snake_length = 3;
grid[pos(10, 10, width, height)] = 1;
grid[pos(15, 15, width, height)] = 1 << 15;
SDL_Event e = {0};
int quit = 0;
while (e.type != SDL_QUIT && !quit) {
SDL_PollEvent(&e);
int state_len = -1;
const Uint8 *state = SDL_GetKeyboardState(&state_len);
if (state[SDL_SCANCODE_UP] && direction != DOWN) {
direction = UP;
}
if (state[SDL_SCANCODE_DOWN] && direction != UP) {
direction = DOWN;
}
if (state[SDL_SCANCODE_LEFT] && direction != RIGHT) {
direction = LEFT;
}
if (state[SDL_SCANCODE_RIGHT] && direction != LEFT) {
direction = RIGHT;
}
SDL_SetRenderDrawColor(ren, 20, 20, 20, 255);
SDL_RenderClear(ren);
for (int i = 0; i < width * height; i++) {
int cell = grid[i] & 0xffff;
if (cell == (1 << 15) || cell == 0) {
int x = 0;
int y = 0;
switch (direction) {
case UP: y++; break;
case DOWN: y+=height-1; break;
case LEFT: x++; break;
case RIGHT: x+=width-1; break;
}
int peek = grid[pos(i % width + x, i / width + y, width, height)] & 0xffff;
grid[i] = (cell << 16) | cell;
if (peek == 1) {
grid[i] = (1 << 16) | cell;
if (cell == (1 << 15)) {
snake_length++;
int new_pos = pos(rand(), rand(), width, height);
while (grid[new_pos] & 0xffff != 0) {
new_pos = pos(rand(), rand(), width, height);
}
grid[new_pos] |= ((1 << 15) << 16) | (1 << 15);
}
}
}
if (cell > 0 && cell < (1 << 15)) {
if (cell <= snake_length) {
grid[i] = ((cell + 1) << 16) | cell;
}
}
}
for (int i = 0; i < width * height; i++) {
grid[i] = grid[i] >> 16;
int cell = grid[i] & 0xffff;
if (cell == (1 << 15)) {
SDL_SetRenderDrawColor(ren, 200, 200, 0, 255);
} else if (cell < (1 << 15) && cell > 0) {
SDL_SetRenderDrawColor(ren, 255, 255, 255, 255);
} else {
SDL_SetRenderDrawColor(ren, 40, 40, 40, 255);
}
int y = (i / width) * 11;
int x = (i % width) * 11;
int w = 10;
int h = 10;
SDL_Rect r = { x, y, w, h };
SDL_RenderFillRect(ren, &r);
}
SDL_RenderPresent(ren);
SDL_Delay(50);
}
SDL_Quit();
return 0;
}
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