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NAME
     glXSwapBuffers - make back buffer visible


C SPECIFICATION
     void glXSwapBuffers( Display *dpy,
                          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 draw-
     able.  The contents of the back  buffer  then  become  unde-
     fined.  The update typically takes place during the vertical
     retrace  of  the  monitor,  rather  than  immediately  after
     glXSwapBuffers  is called.  All GLX rendering contexts share
     the same notion of which are front  buffers  and  which  are
     back buffers.

     glXSwapBuffers  performs  an  implicit  glFlush  before   it
     returns.   Subsequent  GL commands can be issued immediately
     after calling glXSwapBuffers, 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
     Synchronization of multiple GLX contexts  rendering  to  the
     same  double-buffered  window  is  the responsibility of the
     clients.  Use the X Synchronization Extension to  facilitate
     such cooperation.

     The X double buffer extension (DBE) has information on which
     buffer  is  the currently displayed buffer. This information
     is shared with GLX.

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  identi-
     fies a window that is no longer valid.

SEE ALSO
     glFlush

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