fgluQuadricCallback(3G)

NAME
     fgluQuadricCallback - define a callback for a quadrics object


FORTRAN SPECIFICATION
     SUBROUTINE fgluQuadricCallback( CHARACTER*8 quad,
                                     INTEGER*4 which,
                                     CHARACTER*8 (CallBackFunc)( )


PARAMETERS
     quad          Specifies the quadrics object (created with
                   fgluNewQuadric).

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

     CallBackFunc  Specifies the function to be called.


DESCRIPTION
     fgluQuadricCallback 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
                    describing these errors can be retrieved with the
                    fgluErrorString call.


SEE ALSO
     fgluErrorString, fgluNewQuadric