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glutSetWindow
Langue: en
Version: 159308 (fedora - 05/07/09)
Section: 3 (Bibliothèques de fonctions)
BSD mandoc
NAME
glutSetWindow - Select the <i>current window</i>LIBRARY
OpenGLUT - windowSYNOPSIS
In openglut.h Ft void Fn glutSetWindow int IDPARAMETERS
Bf Em
ID Ef
Window identifier
DESCRIPTION
Sets the Bf Licurrent window Ef
to Bf Sy
ID. Ef
All OpenGL rendering goes to the Bf Li
current window Ef
. Many OpenGLUT functions also implicitly use the Bf Li
current window Ef
.
Many OpenGLUT callback operations are tied to a window. When your callback is invoked, OpenGLUT will set that particular window to be the Bf Li
current window Ef
. 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 Bf Em
always Ef
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 Bf Li
current window Ef
is unchanged since some prior time, but OpenGLUT has considerable 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 Bf Li
current window Ef
and draw immediately. This is not always advisable, but may be practical.
It is an error to set the Bf Li
current window Ef
to a non-existant window (e.g., one that you have closed). A warning will be printed on Bf Sy
stderr Ef
if you try to do so, and the Bf Li
current window Ef
should be unchanged.
SEE ALSO
glutGetWindow(3)Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre