snake.c

#define SDL_MAIN_HANDLED
#include "inc/SDL.h"
#include <stdio.h>

#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 600
#define BLOCK_SIZE 20

// Directions
#define UP 0
#define DOWN 1
#define LEFT 2
#define RIGHT 3

typedef struct {
    int x, y;
} Snake;

int init(SDL_Window **window, SDL_Renderer **renderer) {
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        printf("SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
        return 0;
    }

    *window = SDL_CreateWindow("Snake Game", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 
                               SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
    if (!*window) {
        printf("Window could not be created! SDL_Error: %s\n", SDL_GetError());
        return 0;
    }

    *renderer = SDL_CreateRenderer(*window, -1, SDL_RENDERER_ACCELERATED);
    if (!*renderer) {
        printf("Renderer could not be created! SDL_Error: %s\n", SDL_GetError());
        return 0;
    }

    return 1;
}

int handle_events(int *direction) {
    SDL_Event e;
    while (SDL_PollEvent(&e)) {
        if (e.type == SDL_QUIT) {
            return 0;
        } 
        if (e.type == SDL_KEYDOWN) {
            switch (e.key.keysym.sym) {
                case SDLK_UP:
                    if (*direction != DOWN) *direction = UP;
                    break;
                case SDLK_DOWN:
                    if (*direction != UP) *direction = DOWN;
                    break;
                case SDLK_LEFT:
                    if (*direction != RIGHT) *direction = LEFT;
                    break;
                case SDLK_RIGHT:
                    if (*direction != LEFT) *direction = RIGHT;
                    break;
            }
        }
    }
    return 1;
}

int main(int argc, char *argv[]) {
    SDL_Window *window = NULL;
    SDL_Renderer *renderer = NULL;

    if (!init(&window, &renderer)) {
        return 1;
    }

    Snake snake = {SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2};
    int direction = RIGHT; // Initial movement

    int running = 1;
    while (running) {
        running = handle_events(&direction);

        // Update snake position based on direction
        if (direction == UP) snake.y -= BLOCK_SIZE;
        if (direction == DOWN) snake.y += BLOCK_SIZE;
        if (direction == LEFT) snake.x -= BLOCK_SIZE;
        if (direction == RIGHT) snake.x += BLOCK_SIZE;

        // Clear the screen
        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
        SDL_RenderClear(renderer);

        // Draw the snake
        SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
        SDL_Rect snakeBlock = {snake.x, snake.y, BLOCK_SIZE, BLOCK_SIZE};
        SDL_RenderFillRect(renderer, &snakeBlock);

        SDL_RenderPresent(renderer);
        SDL_Delay(100);
    }

    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}