[Mesa-dev] Another Take on the S3TC issue

[Marek Olšák]

I don't think this is our problem. If a distro wants S3TC support, its
maintainers can package libtxc_dxtn. Some distros really do it. If a
distro doesn't want S3TC support, there is nothing we can do about it.

Marek

On Tue, Aug 13, 2013 at 8:53 PM, Uwe Schmidt
<simon.schmidt at cs-systemberatung.de> wrote:
> Hi,
>
> I have read about the issue of implementing the S3TC Extension in Mesa:
> http://dri.freedesktop.org/wiki/S3TC/
>
> As I understood, the problem is, that encoding and decoding S3TC in
> software is covered by patents, while passing S3TC compressed data to the
> GPU is still ok.
>
> AS NOW:
>
> If "force_s3tc_enable" is enabled in Mesa3D, uploading a S3TC encoded
> texture works if format==internalFormat is true. If format!=internalFormat
> is true, it would fail (as i know).
>
> SO MY PROPOSAL:
>
> If 'format' is one of the S3TC types, and format!=internalFormat is true,
> then set internalFormat:=format.
>
> Else, if 'internalFormat' is one of the S3TC types, but the 'format' isn't,
> set internalFormat:=format (or any other format, Mesa3D can encode).
>
>
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