redhat man page for glutspaceballbuttonfunc

glutSpaceballButtonFunc(3GLUT)					       GLUT					    glutSpaceballButtonFunc(3GLUT)

NAME
       glutSpaceballButtonFunc - sets the Spaceball button callback for the current window.

SYNTAX
       void glutSpaceballButtonFunc(void (*func)(int button, int state));

ARGUMENTS
       func	 The new spaceball button callback function.

DESCRIPTION
       glutSpaceballButtonFunc	sets  the  Spaceball  button callback for the current window. The Spaceball button callback for a window is called
       when the window has Spaceball input focus (normally, when the mouse is in the window) and the user generates Spaceball button presses.  The
       button  parameter  will	be  the  button number (starting at one). The number of available Spaceball buttons can be determined with glutDe-
       viceGet(GLUT_NUM_SPACEBALL_BUTTONS). The state is either GLUT_UP or GLUT_DOWN indicating whether the callback was due to a release or press
       respectively.

       Registering  a  Spaceball button callback when a Spaceball device is not available is ineffectual and not an error. In this case, no Space-
       ball button callbacks will be generated.

       Passing NULL to glutSpaceballButtonFunc disables the generation of Spaceball button callbacks. When a new window is created,  no  Spaceball
       button callback is initially registered.

SEE ALSO
       glutSpaceballMotionFunc, glutSpaceballRotateFunc, glutMouseFunc, glutButtonBoxFunc, glutTabletButtonFunc, glutJoystickFunc, glutDeviceGet

AUTHOR
       Mark J. Kilgard (mjk@nvidia.com)

GLUT
									3.7					    glutSpaceballButtonFunc(3GLUT)