用opengl绘制一个旋转的三棱锥，给出代码

以下是使用 OpenGL 绘制旋转的三棱锥的代码：

#include <GL/glut.h>

GLfloat angle = 0.0f;

void renderScene(void) {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glTranslatef(0.0f, 0.0f, -5.0f);
    glRotatef(angle, 1.0f, 1.0f, 1.0f);
    glBegin(GL_TRIANGLES);
    // 绘制三棱锥的六个面
    glColor3f(1.0f, 0.0f, 0.0f);
    glVertex3f(0.0f, 1.0f, 0.0f);
    glVertex3f(-1.0f, -1.0f, 1.0f);
    glVertex3f(1.0f, -1.0f, 1.0f);
    glColor3f(0.0f, 1.0f, 0.0f);
    glVertex3f(0.0f, 1.0f, 0.0f);
    glVertex3f(1.0f, -1.0f, 1.0f);
    glVertex3f(1.0f, -1.0f, -1.0f);
    glColor3f(0.0f, 0.0f, 1.0f);
    glVertex3f(0.0f, 1.0f, 0.0f);
    glVertex3f(1.0f, -1.0f, -1.0f);
    glVertex3f(-1.0f, -1.0f, -1.0f);
    glColor3f(1.0f, 1.0f, 0.0f);
    glVertex3f(0.0f, 1.0f, 0.0f);
    glVertex3f(-1.0f, -1.0f, -1.0f);
    glVertex3f(-1.0f, -1.0f, 1.0f);
    glColor3f(1.0f, 0.0f, 1.0f);
    glVertex3f(-1.0f, -1.0f, 1.0f);
    glVertex3f(1.0f, -1.0f, 1.0f);
    glVertex3f(1.0f, -1.0f, -1.0f);
    glColor3f(0.0f, 1.0f, 1.0f);
    glVertex3f(1.0f, -1.0f, -1.0f);
    glVertex3f(-1.0f, -1.0f, -1.0f);
    glVertex3f(-1.0f, -1.0f, 1.0f);
    glEnd();
    angle += 0.1f;
    glutSwapBuffers();
}

int main(int argc, char **argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(320, 320);
    glutCreateWindow("OpenGL Demo");
    glutDisplayFunc(renderScene);
    glutIdleFunc(renderScene);
    glEnable(GL_DEPTH_TEST);
    glutMainLoop();
    return 0;
}

这段代码使用 GLUT 库来创建 OpenGL 窗口，然后使用 glBegin 和 glEnd 函数分别开始和结束绘制三角形的过程。在绘制三角形之前，通过 glTranslatef 和 glRotatef 函数分别对三棱锥进行平移和旋转。最后，使用 glutIdleFunc 函数来定义一个循环，在循环中不断地更新旋转角度，并调用 glutSwapBuffers 函数来更新窗口。