[Mesa-dev] [PATCH 0/2] First attempt at asynchronous SwapBuffers

[Dave Airlie]

> The thread offloading has been implemented in the radeon driver for
> more than a year. We just can't fully use it because of what I've
> written above. I'm not inventing anything here.
>
> I wasn't at XDC and I don't really know much about the protocol and
> why there are roundtrips. All I want is a SwapBuffers DRI command
> which:
> - can swap buffers in the fire-and-forget fashion
> - doesn't return values, doesn't generate events
> - can be invoked with a different X connection than the main one
>
> The main thread can be halfway through enqueuing new hw commands for
> the next frame and I want SwapBuffers to work in that situation (at
> least DRI buffers shouldn't change).

Could we backpatch the relocations if we haven't emitted any CS
packets since the last frame, if we get an invalidate in the middle?

Dave.