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

[Marek Olšák]

On Sat, Oct 10, 2015 at 5:49 PM, Marek Olšák <maraeo at gmail.com> 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.

That said, we might need to keep the DCC decompression for image store
instructions, which don't support compression.

Marek