[Mesa-dev] [PATCH 16/16] st/nine: Rework texture data allocation

[Ilia Mirkin]

On Fri, Apr 24, 2015 at 6:13 PM, Axel Davy <axel.davy at ens.fr> wrote:
> Le 25/04/2015 00:02, Ilia Mirkin a écrit :
>>
>>
>> I'm having trouble understanding what you're changing here... perhaps
>> a better commit description could go a ways to clearing things up?
>> Were you allocating it a level at a time before? How did that work, I
>> don't see a per-level structure... I'm guessing there's a bit more
>> going on here.
>>
> Yes, we were allocating per level, whereas there we allocate once for all
> levels, and get the offset.
>
> The nine_format_get_p_offset are called once per texture creation for every
> level, after the pointers are cached in the surfaces associated to the
> levels.

So that'll be n^2 calls to the size function. Which is suboptimal.