glutLayerGet - retrieves GLUT state pertaining to the lay-
       ers of the current window.

SYNTAX

       int glutLayerGet(GLenum info);

ARGUMENTS

       info      Name of device information to retrieve.

       GLUT_OVERLAY_POSSIBLE
               Whether an overlay could be  established  for  the
               current  window  given the current initial display
               mode. If  false,  glutEstablishOverlay  will  fail
               with a fatal error if called.

       GLUT_LAYER_IN_USE
               Either  GLUT_NORMAL  or  GLUT_OVERLAY depending on
               whether the normal plane or overlay is  the  layer
               in use.

       GLUT_HAS_OVERLAY
               If  the current window has an overlay established.

       GLUT_TRANSPARENT_INDEX
               The transparent color index of the overlay of  the
               current  window;  negative  one  is returned if no
               overlay is in use.

       GLUT_NORMAL_DAMAGED
               True if the normal plane of the current window has
               damaged (by window system activity) since the last
               display  callback  was  triggered.  Calling  glut-
               PostRedisplay will not set this true.

       GLUT_OVERLAY_DAMAGED
               True  if  the  overlay plane of the current window
               has damaged (by window system activity) since  the
               last display callback was triggered. Calling glut-
               PostRedisplay or glutPostOverlayRedisplay will not
               set  this  true.  Negative  one  is returned if no
               overlay is in use.

DESCRIPTION

       glutLayerGet retrieves GLUT layer information for the cur-
       rent  window  represented  by integers. The info parameter
       determines what type of layer information to return.

SEE ALSO

       glutEstablishOverlay, glutUseOverlay, glutCreateWindow,
       glutSetColor

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)