Comment 4 for bug 377090
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0e1f616
(Get the code!)
Updated the summary and changed to an RFE. Last patch set went to dri-devel under the subject "Another page flipping update".
Basically, compositing managers need a way of making sure their front buffer rendering can occur w/o tearing. This includes composited video. This RFE covers an tear-free glXSwapBuffers implementation that any OpenGL application can use for this purpose. It's possible to do this in other ways, for example through an X extension or something, but that's a subject for another RFE if someone wants to take it on.