请帮我用OpenGL写一个有光照环境的旋转茶壶的代码

好的，以下是一个基于OpenGL的旋转茶壶的代码，包含了光照环境：

#include <GL/glut.h>
#include <cmath>

// 定义三维向量结构体
struct Vector3
{
    GLfloat x, y, z;
};

// 法向量计算函数
void calculateNormal(Vector3 p1, Vector3 p2, Vector3 p3, Vector3& normal)
{
    Vector3 v1, v2;
    v1.x = p2.x - p1.x;
    v1.y = p2.y - p1.y;
    v1.z = p2.z - p1.z;

    v2.x = p3.x - p1.x;
    v2.y = p3.y - p1.y;
    v2.z = p3.z - p1.z;

    normal.x = v1.y * v2.z - v1.z * v2.y;
    normal.y = v1.z * v2.x - v1.x * v2.z;
    normal.z = v1.x * v2.y - v1.y * v2.x;
}

void display()
{
    static GLfloat angle = 0.0f;

    // 设置光源位置
    GLfloat lightPosition[] = { 0.0f, 0.0f, 1.0f, 0.0f };

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    // 设置相机位置
    gluLookAt(0.0f, 0.0f, 10.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);

    // 设置旋转角度
    glRotatef(angle, 1.0f, 1.0f, 1.0f);

    // 绘制茶壶
    GLfloat ambient[] = { 0.0f, 0.0f, 1.0f, 1.0f };
    GLfloat diffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };
    GLfloat specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
    GLfloat shininess[] = { 50.0f };

    glMaterialfv(GL_FRONT, GL_AMBIENT, ambient);
    glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuse);
    glMaterialfv(GL_FRONT, GL_SPECULAR, specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, shininess);

    glutSolidTeapot(2.0f);

    // 开启光照
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);

    // 设置光源参数
    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);

    // 设置环境光
    GLfloat ambientLight[] = { 0.2f, 0.2f, 0.2f, 1.0f };
    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambientLight);

    // 绘制法向量
    glColor3f(1.0f, 0.0f, 0.0f);
    glBegin(GL_LINES);
    for (int i = 0; i < 325; i += 3)
    {
        Vector3 p1, p2, p3, normal;
        p1.x = glutSolidTeapot_data[i];
        p1.y = glutSolidTeapot_data[i + 1];
        p1.z = glutSolidTeapot_data[i + 2];

        p2.x = glutSolidTeapot_data[i + 3];
        p2.y = glutSolidTeapot_data[i + 4];
        p2.z = glutSolidTeapot_data[i + 5];

        p3.x = glutSolidTeapot_data[i + 6];
        p3.y = glutSolidTeapot_data[i + 7];
        p3.z = glutSolidTeapot_data[i + 8];

        calculateNormal(p1, p2, p3, normal);

        glVertex3f(p1.x, p1.y, p1.z);
        glVertex3f(p1.x + normal.x, p1.y + normal.y, p1.z + normal.z);
    }
    glEnd();

    // 关闭光照
    glDisable(GL_LIGHTING);

    // 更新旋转角度
    angle += 0.5f;
    if (angle >= 360.0f)
    {
        angle = 0.0f;
    }

    glutSwapBuffers();
}

void reshape(int width, int height)
{
    glViewport(0, 0, width, height);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    gluPerspective(45.0f, (float)width / height, 0.1f, 100.0f);
}

void init()
{
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

    glShadeModel(GL_SMOOTH);

    glEnable(GL_DEPTH_TEST);

    glEnable(GL_NORMALIZE);
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
    glutInitWindowSize(640, 480);
    glutCreateWindow("Rotating Teapot with Lighting");

    glutDisplayFunc(display);
    glutReshapeFunc(reshape);

    init();

    glutMainLoop();

    return 0;
}

注：该代码使用了OpenGL的固定函数管线，不过仍然可以用现代OpenGL的着色器来实现。