glutReshapeFunc  -  sets the reshape callback for the cur-
rent window.

glutReshapeFunc
	glutReshapeFunc(func) -> None

void glutReshapeFunc(void (*func)(int width, int height));

func      The new reshape callback function.

glutReshapeFunc sets the reshape callback for the  current
window. The reshape callback is triggered when a window is
reshaped. A reshape callback is also triggered immediately
before a window's first display callback after a window is
created or whenever an overlay for the  window  is  estab-
lished.  The  width  and height parameters of the callback
specify the new window size in pixels.  Before  the  call-
back,  the  current  window  is set to the window that has
been reshaped.

If a reshape callback is not registered for  a  window  or
NULL  is passed to glutReshapeFunc (to deregister a previ-
ously registered callback), the default  reshape  callback
is  used.  This  default callback will simply call glView-
port(0,0,width,height) on the normal  plane  (and  on  the
overlay if one exists).

If  an  overlay  is  established  for the window, a single
reshape  callback  is  generated.  It  is  the  callback's
responsibility to update both the normal plane and overlay
for the window (changing the layer in use as necessary).

When a top-level window is reshaped,  subwindows  are  not
reshaped.  It is up to the GLUT program to manage the size
and positions of subwindows  within  a  top-level  window.
Still,  reshape callbacks will be triggered for subwindows
when their size is changed using glutReshapeWindow.

glutDisplayFunc, glutReshapeWindow

Mark J. Kilgard (mjk@nvidia.com)