[Mesa-dev] [PATCH 1/7] ac/surface: handle DCC subresource fast clear restriction on VI

[Marek Olšák]

On Wed, Apr 18, 2018 at 4:44 PM, Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
wrote:

> IIRC if level N is unaligned then num_dcc_levels <= N+1, so level N+1
> is not DCC compressed?
>

There is a difference between being aligned (contiguous really) and being
compressible. Small mip levels might be unaligned but may still
compressible. Non-contiguous can mean that DCC of multiple mip levels is
interleaved in memory. It can't be cleared with memset trivially, but it
can still be compressed.

Marek
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