glutSpecialUpFunc  -  sets  the  special  keyboard up (key
release) callback for the current window.

glutSpecialUpFunc
	glutSpecialUpFunc(func) -> None

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

func      The new special callback function.

glutSpecialUpFunc  sets  the  special  keyboard  up   (key
release) callback for the current window. The special key-
board up callback is triggered when keyboard  function  or
directional  keys are released. 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 up callback is initially
registered and special key  releases  in  the  window  are
ignored.   Passing  NULL to glutSpecialUpFunc disables the
generation of special up callbacks.

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

To avoid the reporting of key release/press pairs  due  to
auto   repeat,  use  glutIgnoreKeyRepeat  to  ignore  auto
repeated keystrokes.

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.

GLUT_KEY_F9
        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.

glutSpecialFunc,   glutKeyboardFunc,   glutKeyboardUpFunc,
glutMouseFunc, glutSpaceballButtonFunc, glutButtonBoxFunc,
glutTabletButtonFunc,  glutGetModifiers,  glutIgnoreKeyRe-
peat

Mark J. Kilgard (mjk@nvidia.com)