Chris Wilson <ch...@chris-wilson.co.uk> writes: > Currently we call XSync() to run the event queue to catch the invalidate > event before we wait for the reply from the DRI2SwapBuffers request. > However, the XServer sends the DRI2InvalidateNotify event before sending > the DRI2SwapBuffers reply and so the invalidate event is processed in > the normal manner by xcb before it returns the DRI2SwapBuffers reply > without having to add an extra round-trip.
You need Xlib to have processed the event, not just XCB. I remember the XSync being required to make rendering actually work correctly when I wrote the code.
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