[Mesa-dev] [PATCH 4/4] pipe: Add new bind flag for shared resources with flush_resource call

[Bas Nieuwenhuizen]

My apologies, wrong term. I meant the front buffer of the X server in
the non-compositing case.

- Bas

On Wed, Oct 21, 2015 at 1:26 PM, Axel Davy <axel.davy at ens.fr> wrote:
> On 21/10/2015 13:16, Bas Nieuwenhuizen wrote:
>>
>> On Wed, Oct 21, 2015 at 12:28 PM, Axel Davy <axel.davy at ens.fr> wrote:
>>>
>>> +/* This flag indicates that in addition to being shared, the resource
>>> won't be
>>> + * read by any external process before we call flush_resource. This
>>> allows
>>> + * things like compressing the buffer when drawing, while uncompressing
>>> on
>>> + * flush_resource. The PIPE_BIND_SHARED must still be set with this
>>> flag.
>>> + * If PIPE_BIND_SHARED is specified but not
>>> + * PIPE_BIND_SHARED_FLUSH_RESOURCE, then the resource must be
>>> + * readable by external processes after any normal flush. */
>>
>> I think these comments would allow the dri2 front buffer to have this
>> flag set as it is never shared with another process?
>>
>> - Bas
>>
> The front buffer is read by the X server, which is another process.
>
> In the case we have a fake front buffer, waitX/waitGL will trigger
> read/writes with the X server real front buffer.
>
> We could advertise the flag for fake front buffers if we were calling
> flush_resource for waitX/waitGL,
> but we don't do that.
>
> Axel