可以提供一个C语言OpenGL编写的贪吃蛇代码吗

当然可以，以下是一个简单的基于OpenGL和C语言的贪吃蛇游戏代码：

#include <GL/glut.h>
#include <stdlib.h>
#include <time.h>

#define ROWS 25
#define COLS 25
#define FPS 10

int snake_length = 1;
int snake_pos_x[ROWS * COLS] = {0};
int snake_pos_y[ROWS * COLS] = {0};
int food_x = 0, food_y = 0;
int direction = GLUT_KEY_RIGHT;
int game_over = 0;
int score = 0;

void init(void)
{
    glClearColor(1.0, 1.0, 1.0, 0.0);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0, COLS, 0, ROWS);
    srand(time(NULL));
    food_x = rand() % COLS;
    food_y = rand() % ROWS;
}

void draw_snake(void)
{
    glColor3f(0.0, 0.0, 1.0); // Snake color is blue
    for (int i = 0; i < snake_length; i++) {
        glRecti(snake_pos_x[i], snake_pos_y[i], snake_pos_x[i]+1, snake_pos_y[i]+1);
    }
}

void draw_food(void)
{
    glColor3f(1.0, 0.0, 0.0); // Food color is red
    glRecti(food_x, food_y, food_x+1, food_y+1);
}

void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    draw_snake();
    draw_food();
    glutSwapBuffers();
}

void update(void)
{
    if (game_over) {
        return;
    }

    // Move the snake
    for (int i = snake_length - 1; i > 0; i--) {
        snake_pos_x[i] = snake_pos_x[i-1];
        snake_pos_y[i] = snake_pos_y[i-1];
    }
    switch(direction) {
        case GLUT_KEY_UP:
            snake_pos_y[0]++;
            break;
        case GLUT_KEY_DOWN:
            snake_pos_y[0]--;
            break;
        case GLUT_KEY_LEFT:
            snake_pos_x[0]--;
            break;
        case GLUT_KEY_RIGHT:
            snake_pos_x[0]++;
            break;
    }

    // Check if snake collides with food
    if (snake_pos_x[0] == food_x && snake_pos_y[0] == food_y) {
        snake_length++;
        score++;
        food_x = rand() % COLS;
        food_y = rand() % ROWS;
    }

    // Check if snake collides with itself
    for (int i = 1; i < snake_length; i++) {
        if (snake_pos_x[0] == snake_pos_x[i] &&
            snake_pos_y[0] == snake_pos_y[i]) {
            game_over = 1;
            break;
        }
    }

    // Check if snake collides with walls
    if (snake_pos_x[0] < 0 || snake_pos_x[0] >= COLS ||
        snake_pos_y[0] < 0 || snake_pos_y[0] >= ROWS) {
        game_over = 1;
    }

    glutPostRedisplay();
}

void keyboard(int key, int x, int y)
{
    switch(key) {
        case GLUT_KEY_UP:
        case GLUT_KEY_DOWN:
        case GLUT_KEY_LEFT:
        case GLUT_KEY_RIGHT:
            if (abs(direction - key) != 2) {
                direction = key;
            }
            break;
    }
}

int main(int argc, char* argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    glutInitWindowSize(COLS * 20, ROWS * 20);
    glutCreateWindow("Snake Game");
    glutDisplayFunc(display);
    glutIdleFunc(update);
    glutSpecialFunc(keyboard);
    init();
    glutMainLoop();
    return 0;
}

这段代码使用了OpenGL和GLUT库来实现图形界面，通过键盘控制蛇的移动。同时，它也包含了游戏结束、得分统计、食物生成、蛇的移动等游戏逻辑。同时，代码中也考虑了蛇与边界和自身的碰撞检测。