title: Is it possible to replace glutMainLoop() with simple loop?
body: <p>Is it possible to replace <code>glutMainLoop()</code> with simple loop ( e.g. <code>while</code> or <code>for</code> ) and in this loop just call all callbacks?</p>
  
  <p>I have done this and picture is displaying fine but window ( in which is picture displayed ) is not responding ( can not move  it ).</p>
  
  <p>Does <code>glutMainLoop()</code> call more than callbacks?</p>