Hi On Wed, Jun 10, 2015 at 6:17 PM, Chris Wilson <ch...@chris-wilson.co.uk> wrote:
> I did not find how you serialised the XServer reading from the SHM > following the call to XShmPutImage (which you may want to flush?) with > subsequent rendering into the image. > > Correct, there is no sync. And I think that explains the temporary glitches I observe with gnome-shell when moving windows around for ex (they are always temporary, there is fortunately always a pending update to fix it). I am afraid it would have to wait for ShmCompletionEvent, unfortunately in sync, since there is a single buffer, and mesa doesn't own the event queue&loop (I think). Note that the sw x11 backend also seems to suffer from this. Another trick you may like to investigate is using the X server to do > format conversions and tune the swrast for a small number of local > formats (i.e. rgb16, argb32). This of course requires using XRender > after the PutImage - and at that point keeping it as a ShmPixmap is > hugely beneficial to UMA drivers. > That's an interesting optimization. However, my use case is mostly with spice/vnc, so I don't think that would improve performance here since it's all software-based. thanks -- Marc-André Lureau
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