[Mesa-dev] [PATCH 0/6] Add support for BPTC texture compression

[Roland Scheidegger]

Am 07.08.2014 14:30, schrieb Neil Roberts:
> Kristian Høgsberg <krh at bitplanet.net> writes:
> 
>> That's a great reference image.  Do you have a version of the image
>> compressed with nVidias online compressor?
> 
> I finally got access to an NVidia card last night so I've added an image
> from their online compressor to the bottom of that page.
> 
> https://urldefense.proofpoint.com/v1/url?u=http://busydoingnothing.co.uk/doge/&k=oIvRg1%2BdGAgOoM1BIlLLqw%3D%3D%0A&r=F4msKE2WxRzA%2BwN%2B25muztFm5TSPwE8HKJfWfR2NgfY%3D%0A&m=CGSAZSTw9Un5ItoSGQ8sSdQn8W9K0TvyiPG2a5VuGBY%3D%0A&s=5d3b47158c2e45f532200334cb2e6a584fc16a357f259e25113089e6052d3e43
> 
> Apparently NVidia's driver is powered by some sort of magic because it
> looks indistinguishable to my eye compared to the original image and it
> took no noticeable time to compress. I zoomed in on it with the Gimp to
> verify that it is actually different, and it is a little bit.
> 
> Changing the compressor hint makes no difference and the resulting image
> is byte-for-byte identical.

If it is computationally intensive, maybe they are doing it on the gpu?
Though I guess in this case the time would be different if you'd run it
on a GT 520 or a GTX 780 :-).

Roland