[Mesa-dev] [PATCH 1/3] vl/dri3: use external texture as back buffers

[Michel Dänzer]

On 27/10/16 07:52 PM, Andy Furniss wrote:
> Andy Furniss wrote:
>> Michel Dänzer wrote:
>>> On 26/10/16 08:07 PM, Andy Furniss wrote:
>>>>
>>>> The bad = Starting with DRI3 (which is default) I still get trashed
>>>> rendering full screen. Windowed including re-sizing seems OK.
>>>>
>>>> I use Fluxbox window manager, which does not use compositing -
>>>> IIRC this has historically shown some ddx DRI2/3 issue that wasn't
>>>> visible to those testing with compositing (but then the full screen
>>>> case may avoid compositing anyway depending on settings).
>>>
>>> You may be running into a DDX driver issue fixed by
>>> https://patchwork.freedesktop.org/patch/118514/ .
>>
>> Yes, that was it, OK with that patch.
> 
> Though "OK", sub-optimal loosing pageflip on tonga, as a vsync test
> fails top 5% of screen unless I force GPU perf high.
> 
> Not related to this patch directly of course, but I am a bit surprised
> that on auto powerplay the tonga is too slow to make 60Hz.

It's not too slow for 60 Hz (or you'd get dropped frames), the blit just
doesn't finish within the vertical blank period.

Longer term I have an idea how to make the DDX driver support page
flipping in this case as well, but in the meantime making the buffers
sent for presentation tiled instead of linear should allow page flipping
to be used. https://patchwork.freedesktop.org/patch/110569/ might be
enough, which seems to be the best candidate to resolve the nouveau
VDPAU issues as well.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer