[Mesa-dev] [PATCH v2 0/12] Add support for BPTC texture compression

[Chris Forbes]

Does this actually work on all Gen7?

The IVB PRM Vol 4 Part 1 Page 83 says:

   Errata: BC6H_SF16, BC6H_UF16, and BC7_SRGB are not supported and
may result in data corruption if used.

On Thu, Aug 7, 2014 at 4:27 AM, Neil Roberts <neil at linux.intel.com> wrote:
> Here is a v2 of the BPTC texture compression series. The main
> difference is that instead of going via DXT3 for the UNORM formats it
> now always uses the custom naïve compressor for all formats. This
> doesn't give very good-looking results but it is fast and doesn't add
> any dependencies. There was some discussion about alternative
> approaches on the list here:
>
> http://lists.freedesktop.org/archives/mesa-dev/2014-July/064436.html
>
> I didn't manage to get any consensus on whether this approach is the
> right thing to do so I thought I would just post the patches and see
> what happens.
>
> The other changes are:
>
> • The patches are rebased on top of Jason Ekstrand's texstore changes.
>   This required some modification to format_info.py.
>
> • Added a patch to make glGenerateMipmap work with the BPTC formats.
>
> • Added a patch to make the meta implementation of glGetTexImage work
>   with the two floating-point formats.
>
> • Added the formats to some format query functions that were missed.
>   (There are a lot of switches for formats spread around Mesa!)
>
> • Fixed setting the alpha component to 1.0 when fetching from the RGB
>   half-float formats.
>
> • Fixed fetching the alpha component from sRGB formats.
>
> • Fixed the quantization step for the half-float compressor.
>
> • Fixed a typo causing a bug in the compressor for textures with a
>   width that isn't a multiple of four.
>
> The patches are also available on Github here:
>
> https://github.com/bpeel/mesa/commits/wip/bptc
>
> There are piglit tests for BPTC in a branch here:
>
> https://github.com/bpeel/piglit/commits/wip/bptc
>
> - Neil
>
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