title: How to push the "clear color" onto the attribute stack
body: <p>I'm trying to use glPushAttrib to push the "clear color" (set using glClearColor) onto the attribute stack. The problem is: I'm not sure which flag to send to glPushAttrib.</p>
  
  <p>Background: I normally use glClearColor to set my app's "background" color. However, in a few places I have to change the glClearColor to clear out a texture that I'm drawing into. I want to use the attrib stack to push and then pop the "background" color so it doesn't get messed up.</p>
  
  <p>Thanks!</p>