glXWaitX — complete X execution prior to subsequent GL calls
X rendering calls made prior to
glXWaitX are guaranteed to be
executed before GL rendering calls made after
Although the same result can be achieved using
glXWaitX does not require a round trip to the server,
and it is therefore more efficient in cases where client and server
are on separate machines.
glXWaitX is ignored if there is no current GLX context.
GLXBadCurrentWindow is generated if the drawable associated
with the current context of the calling thread is a window, and that
window is no longer valid.
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