UNTITLED LOCAL UNTITLED
NAMEglutSetWindow — 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 func‐
tions also implicitly use the current window .
Many OpenGLUT callback operations are tied to a window. When your call‐
back is invoked, OpenGLUT will set that particular window to be the cur‐
rent 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 call‐
back you should always use glutSetWindow() to select the appropriate
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 consider‐
able liberaty with respect to when it invokes your functions. Also, your
program may add more windows or more operations on other windows 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 ALSOglutGetWindow(3)
Epoch
