可以提供一个C语言OpenGL编写的贪吃神代码吗

当然可以，以下是一个简单的 C 语言 OpenGL 编写的贪吃蛇游戏示例代码：

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

#define GRID_SIZE 20
#define GRID_WIDTH 30
#define GRID_HEIGHT 30

int direction = GLUT_KEY_RIGHT;
int food_x, food_y;
int snake_length = 3;
int snake_x[100], snake_y[100];

void init() {
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0, GRID_WIDTH * GRID_SIZE, 0, GRID_HEIGHT * GRID_SIZE);
    srand(time(NULL));
    food_x = rand() % GRID_WIDTH;
    food_y = rand() % GRID_HEIGHT;
}

void draw_square(int x, int y) {
    glBegin(GL_QUADS);
    glVertex2i(x, y);
    glVertex2i(x + GRID_SIZE, y);
    glVertex2i(x + GRID_SIZE, y + GRID_SIZE);
    glVertex2i(x, y + GRID_SIZE);
    glEnd();
}

void draw_snake() {
    glColor3f(1.0, 1.0, 1.0);
    for (int i = 0; i < snake_length; i++) {
        draw_square(snake_x[i] * GRID_SIZE, snake_y[i] * GRID_SIZE);
    }
}

void draw_food() {
    glColor3f(1.0, 0.0, 0.0);
    draw_square(food_x * GRID_SIZE, food_y * GRID_SIZE);
}

void check_food() {
    if (snake_x[0] == food_x && snake_y[0] == food_y) {
        food_x = rand() % GRID_WIDTH;
        food_y = rand() % GRID_HEIGHT;
        snake_length++;
    }
}

void check_collision() {
    for (int i = 1; i < snake_length; i++) {
        if (snake_x[0] == snake_x[i] && snake_y[0] == snake_y[i]) {
            exit(0);
        }
    }
    if (snake_x[0] < 0 || snake_x[0] >= GRID_WIDTH || snake_y[0] < 0 || snake_y[0] >= GRID_HEIGHT) {
        exit(0);
    }
}

void move_snake() {
    for (int i = snake_length - 1; i > 0; i--) {
        snake_x[i] = snake_x[i-1];
        snake_y[i] = snake_y[i-1];
    }
    switch (direction) {
        case GLUT_KEY_UP:
            snake_y[0]++;
            break;
        case GLUT_KEY_DOWN:
            snake_y[0]--;
            break;
        case GLUT_KEY_LEFT:
            snake_x[0]--;
            break;
        case GLUT_KEY_RIGHT:
            snake_x[0]++;
            break;
    }
}

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

void timer(int value) {
    move_snake();
    check_food();
    check_collision();
    glutPostRedisplay();
    glutTimerFunc(100, timer, 0);
}

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:
            direction = key;
            break;
    }
}

int main(int argc, char **argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(GRID_WIDTH * GRID_SIZE, GRID_HEIGHT * GRID_SIZE);
    glutCreateWindow("OpenGL Snake Game");
    init();
    glutDisplayFunc(display);
    glutSpecialFunc(keyboard);
    glutTimerFunc(0, timer, 0);
    glutMainLoop();
    return 0;
}

这个代码使用了 OpenGL 库来绘制游戏界面，可以在 Windows、Linux 和 macOS 等操作系统上编译运行。在运行时，你可以通过方向键来控制贪吃蛇的移动方向，尝试吃掉食物并避免碰到边界和自身。