void timerCallback(int value)
{
        glutPostRedisplay();
        glutTimerFunc(5, timerCallback, 0);
}

int main(int argc, char **argv)
{
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
        glutInitWindowPosition(300, 300);
        glutInitWindowSize(640, 480);
        int windowHandle = glutCreateWindow("Window");
        glutDisplayFunc(paintGL);
        glutReshapeFunc(changeSize);
        glutTimerFunc(5, timerCallback, 0);
        glutMainLoop();
        glutDestroyWindow(windowHandle);
        return 0;
}

void timerCallback(int value)
{
        glutPostRedisplay();
}