[Mesa-dev] INTEL_map_texture on i915/i965

Jason Ekstrand jason at jlekstrand.net
Fri Aug 17 04:37:01 UTC 2018

On Thu, Aug 16, 2018 at 10:39 PM Matt Turner <mattst88 at gmail.com> wrote:

> On Thu, Aug 16, 2018 at 5:50 PM Jason Ekstrand <jason at jlekstrand.net>
> wrote:
> > If that's true then the extension makes no sense other than maybe "we're
> a
> > UMA, we can make things cheap." I think it's more likely that the
> intention
> > is to use a fenced map through the GTT to do the detiling. That said,
> given
> > how sketchy GTT maps are, it's still a pretty questionable extension at
> > best and something we don't want to commit to going forward.
> Why are you speculating about it instead of just reading the extension?

Replying to e-mails from my phone?  I know, not a good excuse.

> https://www.khronos.org/registry/OpenGL/extensions/INTEL/INTEL_map_texture.txt
>     This extension allows to create textures with 'linear' layout which
> allows
>     for simplified access on user side (potentially sacrificing some
>     performance during texture sampling).

Yeah, that's pretty bad.  I mean, there probably are uses such as if you're
doing piles of CPU-side rendering.  If someone really badly wants that
trade-off, maybe it's worth implementing but I'm still a skeptic.

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