glXWaitGL — complete GL execution prior to subsequent X calls
GL rendering calls made prior to
glXWaitGL are guaranteed to be
executed before X rendering calls made after
Although this same result can be achieved using glFinish,
glXWaitGL 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.
glXWaitGL 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window is no longer valid.
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