[Mesa-dev] [PATCH 2/4] st/dri2: Add shared flag to missing locations

[Marek Olšák]

On Thu, Oct 22, 2015 at 10:56 AM, Erik Faye-Lund <kusmabite at gmail.com> wrote:
> On Thu, Oct 22, 2015 at 10:54 AM, Marek Olšák <maraeo at gmail.com> wrote:
>> On Thu, Oct 22, 2015 at 10:22 AM, Erik Faye-Lund <kusmabite at gmail.com> wrote:
>>> On Wed, Oct 21, 2015 at 10:34 PM, Marek Olšák <maraeo at gmail.com> wrote:
>>>> On Wed, Oct 21, 2015 at 12:28 PM, Axel Davy <axel.davy at ens.fr> wrote:
>>>>> The PIPE_BIND_SHARED flag should be added whenever
>>>>> the resource may be shared with another process.
>>>>>
>>>>> In particular if the resource is imported, or may
>>>>> be exported, the flag should be used.
>>>>
>>>> This can't be enforced. EGL_MESA_image_dma_buf_export allows exporting
>>>> any texture. Mesa can't know in advance if a texture will be exported.
>>>
>>> Could we not, at least in theory, crate a new texture and blit the old
>>> one into it behind the scenes somehow when a texture gets exported?
>>
>> Sharing means textures are shared. There is no blitting allowed. Other
>> users don't have to be notified that a shared texture has been
>> rendered to.
>
> Maybe I wasn't clear enough: I meant to migrate the texture data over
> to a new shared home, not to create a copy.

Ok, well, in that case it's easier to just share the texture as-is.

Marek