glXSwapBuffers man page on YellowDog

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GLXSWAPBUFFERS()					      GLXSWAPBUFFERS()

NAME
       glXSwapBuffers - exchange front and back buffers

C SPECIFICATION
       void glXSwapBuffers( Display *dpy,
			    GLXDrawable drawable )

       delim $$

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  immedi‐
       ately after glXSwapBuffers is called.

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

       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 pbuffers as well as windows.

       All  GLX	 rendering  contexts  share the same notion of which are front
       buffers and which are back buffers.  One consequence is that when  mul‐
       tiple  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 syn‐
       chronization.  Typically this is accomplished by executing glFinish and
       then using 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       calling	thread,	 and  drawable	identifies  a window that is no longer
       valid.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,	 glXBindSwapBarrierSGIX,  glXJoinSwapGroupSGIX,	 glXSwapInter‐
       valSGI

							      GLXSWAPBUFFERS()
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