gluNurbsCallback
NAME
gluNurbsCallback -- define a callback for a NURBS object
C SPECIFICATION
void gluNurbsCallback(GLUnurbsObj *nobj,
GLenum which,
void (*fn)() )
PARAMETERS
nobj
Specifies the NURBS object (created with gluNewNurbsRenderer).
which
Specifies the callback being defined. The only valid value is GLU_ERROR.
fn
Specifies the function that the callback calls.
DESCRIPTION
gluNurbsCallback is used to define a callback to be used by a NURBS object. If the specified callback is already defined, then it is replaced. If fn is NULL, then any existing callback is erased.
The one legal callback is GLU_ERROR:
GLU_ERROR
The error function is called when an error is encountered. Its single argument is of type GLenum, and it indicates the specific error that occurred. There are 37 errors unique to NURBS named GLU_NURBS_ERROR1 through GLU_NURBS_ERROR37. Character strings describing these errors can be retrieved with gluErrorString.