glutMouseFunc  -  sets  the mouse callback for the current
window.

glutMouseFunc
	glutMouseFunc(func) -> None

void glutMouseFunc(void (*func)(int button, int state,
                   int x, int y));

func      The new mouse callback function.

glutMouseFunc sets the mouse callback for the current win-
dow. When a user presses and releases mouse buttons in the
window, each press and  each  release  generates  a  mouse
callback. The button parameter is one of GLUT_LEFT_BUTTON,
GLUT_MIDDLE_BUTTON, or GLUT_RIGHT_BUTTON. For systems with
only two mouse buttons, it may not be possible to generate
GLUT_MIDDLE_BUTTON callback. For  systems  with  a  single
mouse  button,  it  may  be  possible  to  generate only a
GLUT_LEFT_BUTTON callback. The state parameter  is  either
GLUT_UP  or  GLUT_DOWN indicating whether the callback was
due to a release or press respectively. The x and y  call-
back  parameters  indicate the window relative coordinates
when the mouse button state changed. If a GLUT_DOWN  call-
back  for  a specific button is triggered, the program can
assume a GLUT_UP callback for the same button will be gen-
erated  (assuming  the  window  still has a mouse callback
registered) when the mouse button is released even if  the
mouse has moved outside the window.

If  a  menu  is  attached  to a button for a window, mouse
callbacks will not be generated for that button.

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

Passing NULL to glutMouseFunc disables the  generation  of
mouse callbacks.

glutKeyboardFunc, glutMotionFunc, glutSpaceballButtonFunc,
glutButtonBoxFunc, glutTabletButtonFunc, glutGetModifiers

Mark J. Kilgard (mjk@nvidia.com)