DragonFly On-Line Manual Pages

GLXSWAPBUFFERS()                                              GLXSWAPBUFFERS()

NAME
       glXSwapBuffers - exchange front and back buffers

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 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 after glXSwapBuffers is called.

       glXSwapBuffers performs an implicit glFlush before it returns.
       Subsequent OpenGL commands may 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
       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
       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
       synchronization.  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       calling thread, and drawable identifies a window that is no longer
       valid.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,
       glXSwapIntervalSGI

                                                              GLXSWAPBUFFERS()