[Lima] [Mesa-dev] [PATCH rfc 0/3] Be able to disable EGL/GLX_EXT_buffer_age

[Emil Velikov]

On 5 July 2018 at 14:31, Emil Velikov <emil.l.velikov at gmail.com> wrote:
> Hi Qiang Yu
>
> On 5 July 2018 at 03:31, Qiang Yu <yuq825 at gmail.com> wrote:
>> For GPU like ARM mali Utgard EGL/GLX_EXT_buffer_age will make
>> performace worse. But mesa has no way to disable it.
>>
>> This patch series make driver be able to disable it and add a
>> gallium pipe cap for gallium driver usage. Due to currently
>> only out of tree lima driver need it, and not sure if this is
>> the right way to disable it, so I send this RFC before lima be
>> able to upstream.
>>
> Pretty sure we already have a way to handle that. Look for
> glx_disable_ext_buffer_age - it was introduced for the VMWare driver.
> Although we should:
> a) tweak the name - kind of split if we need to
> b) add glx/dri2 and egl support
>
Looking at the implementation - it uses a driver query, meaning that
one could enable it at a later stage.
No need to worry if the user has old drirc/etc as with current solution.

Having two ways of doing the same thing is a bad idea.
Perhaps we can remove the drirc implementation and use this instead?

Thomas, what do you think?

Thanks
Emil