glutSpecialFunc  -  sets the special keyboard callback for
       the current window.

SYNTAX

       void glutSpecialFunc(void (*func)(int key, int x, int y));

ARGUMENTS

       func      The new special callback function.

DESCRIPTION

       glutSpecialFunc sets the special keyboard callback for the
       current window. The special keyboard callback is triggered
       when keyboard function or directional  keys  are  pressed.
       The  key  callback  parameter is a GLUT_KEY_* constant for
       the special key pressed. The x and y  callback  parameters
       indicate the mouse in window relative coordinates when the
       key was pressed. When a new window is created, no  special
       callback  is  initially registered and special key strokes
       in the window are ignored.  Passing NULL  to  glutSpecial-
       Func disables the generation of special callbacks.

       During  a special callback, glutGetModifiers may be called
       to determine the state of modifier keys when the keystroke
       generating the callback occurred.

       An  implementation  should  do its best to provide ways to
       generate all the GLUT_KEY_* special  keys.  The  available
       GLUT_KEY_* values are:

       GLUT_KEY_F1
               F1 function key.

       GLUT_KEY_F2
               F2 function key.

       GLUT_KEY_F3
               F3 function key.

       GLUT_KEY_F4
               F4 function key.

       GLUT_KEY_F5
               F5 function key.

       GLUT_KEY_F6
               F6 function key.

       GLUT_KEY_F7
               F7 function key.

       GLUT_KEY_F8
               F8 function key.
               F9 function key.

       GLUT_KEY_F10
               F10 function key.

       GLUT_KEY_F11
               F11 function key.

       GLUT_KEY_F12
               F12 function key.

       GLUT_KEY_LEFT
               Left directional key.

       GLUT_KEY_UP
               Up directional key.

       GLUT_KEY_RIGHT
               Right directional key.

       GLUT_KEY_DOWN
               Down directional key.

       GLUT_KEY_PAGE_UP
               Page up directional key.

       GLUT_KEY_PAGE_DOWN
               Page down directional key.

       GLUT_KEY_HOME
               Home directional key.

       GLUT_KEY_END
               End directional key.

       GLUT_KEY_INSERT
               Inset directional key.

       Note  that the escape, backspace, and delete keys are gen-
       erated as an ASCII character.

SEE ALSO

       glutSpecialUpFunc, glutKeyboardFunc, glutMouseFunc,
       glutSpaceballButtonFunc, glutButtonBoxFunc, glutTabletButtonFunc,
       glutGetModifiers

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)