gluQuadricCallback  -  define  a  callback  for a quadrics
       object



C SPECIFICATION

       void gluQuadricCallback( GLUquadric* quad,
                                GLenum which,
                                _GLUfuncptr CallBackFunc )



PARAMETERS

       quad          Specifies the quadrics object (created  with
                     gluNewQuadric).

       which         Specifies  the  callback being defined.  The
                     only valid value is GLU_ERROR.

       CallBackFunc  Specifies the function to be called.


DESCRIPTION

       gluQuadricCallback is used to define a new callback to  be
       used  by  a quadrics object.  If the specified callback is
       already defined, then it is replaced. If  CallBackFunc  is
       NULL, then any existing callback is erased.

       The one legal callback is GLU_ERROR:

       GLU_ERROR      The  function  is  called  when an error is
                      encountered. Its single argument is of type
                      GLenum, and it indicates the specific error
                      that occurred.  Character strings  describ-
                      ing  these errors can be retrieved with the
                      gluErrorString call.


SEE ALSO

       gluErrorString, gluNewQuadric



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