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calling thread, and drawable identifies a window that is no longer
valid.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(3), glXBindSwapBarrierSGIX(3), glXJoinSwapGroupSGIX(3),
glXSwapIntervalSGI(3)
GLXSWAPBUFFERS()
Mac OS X 10.4 X11 - Generated Sat Apr 30 05:14:19 CDT 2005