centos man page for glutsetwindow

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NAME
     glutSetWindow -- Select the <i>current window</i>

LIBRARY
     OpenGLUT - window

SYNOPSIS
     #include <openglut.h>

     void
     glutSetWindow(int ID);

PARAMETERS
      ID	Window identifier

DESCRIPTION
     Sets the  current window	to  ID.

     All OpenGL rendering goes to the  current window  .  Many OpenGLUT functions also implicitly use the  current window  .

     Many OpenGLUT callback operations are tied to a window.  When your callback is invoked, OpenGLUT will set that particular window to be the
     current window  .	However, some callbacks---such as that registered via glutIdleFunc()---do not have associated windows.	If a callback is
     not associated to a particular window, then when OpenGLUT invokes that callback you should  always   use glutSetWindow() to select the appro-
     priate window before doing any OpenGL rendering or doing any OpenGLUT window-related operations.

     There may be cases when you can get away with assuming that the  current window   is unchanged since some prior time, but OpenGLUT has con-
     siderable liberaty with respect to when it invokes your functions.  Also, your program may add more windows or more operations on other win-
     dows as you develop it.

     Lastly, this is a convenient way to select among multiple windows for drawing without actually waiting for that window's display callback.
     Simply set the  current window   and draw immediately.  This is not always advisable, but may be practical.

     It is an error to set the	current window	 to a non-existant window (e.g., one that you have closed).  A warning will be printed on  stderr
     if you try to do so, and the  current window   should be unchanged.

SEE ALSO
     glutGetWindow(3)

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