[Mesa-dev] [PATCH 1/3] vl/dri3: use external texture as back buffers(v4)

[Andy Furniss]

Christian König wrote:
> Am 04.01.2017 um 18:13 schrieb Nayan Deshmukh:
>> dri3 allows us to send handle of a texture directly to X
>> so this patch allows a state tracker to directly send its
>> texture to X to be used as back buffer and avoids extra
>> copying
>>
>> v2: use clip width/height to display a portion of the surface
>> v3: remove redundant variables, fix wrapping, rename variables
>>      handle vaapi path
>> v3.1: we need clip_width/height for every frame so we don't need
>>        to maintain it for each buffer instead use a global variable
>> v4: In case of single gpu we can cache the buffers as applications
>>      use constant number of buffer and we can avoid calls to present
>>      extension for every frame
>>
>> Suggested-by: Leo Liu <leo.liu at amd.com>
>> Signed-off-by: Nayan Deshmukh <nayan26deshmukh at gmail.com>
>
> Acked-by: Christian König <christian.koenig at amd.com>.
>
> Andy & Leo did you guys already had a chance to test it? To me it looks
> like this should work now.

Well there is still the tearing issue from loosing pageflips.

Maybe different GPUs don't see this. I can fix by forcing perf but I
just tested dal and it's not even fixable running that.

I guess that may not count as an issue with these patches as such if
xorg/xf86-video-amdgpu can work around, but it's a very noticeable
regression until that happens.