On Fri, Apr 27, 2018 at 4:14 AM, Nicolai Hähnle <nhaeh...@gmail.com> wrote:
> Sorry, but I still don't understand the logic of this :/ > > What we want to check for is that all the DCC bytes of a mip-level are > contiguous, right? > > Why does it matter for that whether a level is the last level? > > Here's the thought experiment that I can't make sense of: Let's say that > you have format, base level, and number of levels N so that the last-level > condition applies. That is, all levels up to and including N-2 have > dccRamAligned true. Level N-1 has dccRamAligned false, but the patch as-is > will still consider it fast-clearable. > Yes, because the non-contiguous level N-1 DCC range (last level) doesn't overlap with any existing level. It's interleaved with level N that doesn't exist. So clearing the level N-1 DCC range that might overwrite level N DCC range doesn't break anything and so the clear is allowed. Is it clear now? Marek
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