glXWaitX - complete X execution prior to subsequent GL
X rendering calls made prior to glXWaitX() are guaranteed
to be executed before GL rendering calls made after
glXWaitX(). Although the same result can be achieved
using XSync, 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.
glXWaitX() may or may not flush the GL stream.
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window, and that window is no longer valid.
glFinish(), glFlush(), glXWaitGL(), XSync()
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