XRenderComposite Tie To Vsync

[Ryan McClue]

I'm rendering with XRender:
XRenderComposite(display, PictOpSrc, src_pict, 0, dst_pict, 0, 0, 0, 0, 0, 0, window_width, window_height);
I want this to sync with the monitor's VBLANK, i.e. vsync.
How can this be achieved?
Thanks
--
Ryan McClue, Sydney
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