[Mesa-dev] [PATCH 3/8] radeonsi: Enable DCC.

[Marek Olšák]

On Sat, Oct 10, 2015 at 6:12 PM, Axel Davy <axel.davy at ens.fr> wrote:
> On 10/10/2015 17:49, Marek Olšák wrote:
>>
>> On Sat, Oct 10, 2015 at 4:15 PM, Bas Nieuwenhuizen
>> <bas at basnieuwenhuizen.nl> wrote:
>>>
>>> Hi Marek,
>>>
>>> The revised series is mostly done. I wanted to do more testing and to
>>> try to make sure that the added cache flushes I am doing now (a
>>> CACHE_FLUSH event before a fast clear and on switching framebuffers)
>>> are the minimal needed.
>>>
>>>> Also, it looks like we don't need DCC decompression at all, right? It
>>>> might be better to get rid of it and only use the 3D engine to access
>>>> DCC-encoded surfaces.
>>>
>>> I still use it for flush_resource. I could make this redundant by
>>> sharing the DCC buffer by appending the DCC buffer to the texture
>>> resource similarly to how the CMASK is appended to the resource of a
>>> MSAA buffer. This has the secondary benefit of not needing to
>>> reference as many resources for command submission.
>>
>> IIRC, flush_resource is only used for shared (scanout) surfaces where
>> DCC is always disabled.
>>
>> Marek
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>
> I think it's not a very good idea to rely on that.
>
> It may be true for now, but may change in the future:
> For example, perhaps some day wayland will tell egl
> the app is not fullscreen and that a non-scanoutable buffer
> can be used.

If that happens, we'll implement DCC sharing between processes.

Marek