GLXDrawable drawable )

PARAMETERS
       dpy       Specifies the connection to the X server.

       drawable  Specifies the drawable whose buffers are to be swapped.

DESCRIPTION
       glXSwapBuffers  promotes  the contents of the back buffer of drawable to
       become the contents of the front buffer of drawable.   The  contents  of
       the back buffer then become undefined.  The update typically takes place
       during the vertical retrace of the monitor, rather than immediately  af‐
       ter glXSwapBuffers is called.

       glXSwapBuffers  performs  an implicit glFlush before it returns.  Subse‐
       quent  OpenGL  commands  may  be  issued   immediately   after   calling
       glXSwapBuffers,  but  are not executed until the buffer exchange is com‐
       pleted.

       If drawable was not created with respect to  a  double-buffered  visual,
       glXSwapBuffers has no effect, and no error is generated.

NOTES
       The contents of the back buffer become undefined after a swap. Note that
       this applies to pixel buffers as well as windows.

       All GLX rendering contexts share the same notion of which are front buf‐
       fers  and which are back buffers.  One consequence is that when multiple
       clients are rendering to the same double-buffered window,  all  of  them
       should  finish  rendering  before one of them issues the command to swap
       buffers.  The clients are responsible for implementing this synchroniza‐
       tion.  Typically this is accomplished by executing glFinish and then us‐
       ing a semaphore in shared memory to rendezvous before swapping.

ERRORS
       GLXBadDrawable is generated if drawable is not a valid GLX drawable.

       GLXBadCurrentWindow is generated if dpy and  drawable  are  respectively
       the  display  and  drawable  associated  with the current context of the
       calling thread, and drawable identifies  a  window  that  is  no  longer
       valid.

SEE ALSO
       glFlush

                                                             GLXSWAPBUFFERS(3G)