UNTITLED LOCAL UNTITLED
NAME
glutIdleFunc -- Sets the global idle callback.
LIBRARY
OpenGLUT - idletimer
SYNOPSIS
#include <openglut.h>
void
glutIdleFunc(void( *callback )( void ));
PARAMETERS
callback Client function for idle event.
DESCRIPTION
When OpenGLUT's glutMainLoop() is doing nothing else, it checks to see if an ``idle'' callback set. If so, OpenGLUT invokes that callback.
This callback is not bound to any window.
CAVEATS
There is at most one idle callback for your entire application.
SEE ALSO glutTimerFunc(3)glutMainLoop(3)glutMainLoopEvent(3)
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UNTITLED LOCAL UNTITLED
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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