glutmainloop(3) [centos man page]

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NAME

     glutMainLoop -- The standard GLUT event loop entry point.

LIBRARY

     OpenGLUT - mainloop

SYNOPSIS

     #include <openglut.h>

     void
     glutMainLoop(void);

DESCRIPTION

     This is the main driving force for an event-driven OpenGLUT program.  It alternates between calling glutMainLoopEvent() to process pending
     events and then either sleeping or calling your idle function (see glutIdleFunc()).

     This function  can   return, but GLUT's version of this function never returned.  And you must do special things to OpenGLUT to cause OpenG-
     LUT's version to return.

     The cross-reference section for this function's documentation should ideally contain every callback, but the list would be tediously long and
     prone to omissions.

CAVEATS

     For OpenGLUT developers' internal documentation: Runs until the  ExecState  changes to  GLUT_EXEC_STATE_STOP.

BUGS

     Talking to other message systems (e.g., network layers) can be a bit bothersome under the GLUT event model.

SEE ALSO

     glutMainLoopEvent(3) glutLeaveMainLoop(3) glutIdleFunc(3)

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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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