The DRI3 extension provides mechanisms to translate between direct
rendered buffers and X pixmaps. When combined with the Present
extension, a complete direct rendering solution for OpenGL is
provided.
The direct rendered buffers are passed across the protocol via
standard POSIX file descriptor passing mechanisms. On Linux, these
buffers are DMA-BUF objects.
DRI3 also includes a mechanism to translate between Linux Futexes
and X Sync extension Fences. This provides a synchronization
mechanism which can be used to serialize access to shared render
buffers.
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