Re: [Mesa3d-users] Software driver support

[Jason E. <vip...@gm...>]

Thank you very much.  That helped me get the game up.  I understand
the patent issue and maybe this isnt something you can fix, but using
compressed DXT1 all of the alpha showed on the images with a greyish
background instead of the actual color.  For my purposes this isnt an
end game issue (automated testing that doesnt care about graphics.)
however it would be nice to fix.  If a screen shot is required I will
talk to my bosses to see if that can be sent.

I do have another issue.  Our games run on multi-monitor setups.  When
using mesa3d, everything seems to be drawn only on the last monitor
initialize (in our case usually monitor #2 or #3).  This does not
occur using hardware opengl.

On Fri, Jul 24, 2009 at 11:19 AM, tom fogal<tf...@al...> wrote:
> Jason Erickson <vip...@gm...> writes:
>> My problem is that it doesnt support GL_COMPRESSED_RGB_S3TC_DXT1_EXT
>> for 2D textures.  Whenever I try to get my program to run the mesa3d
>> dll returns an invalid enum.
> [snip]
>> So I'm basically asking if support for GL_COMPRESSED_RGB_S3TC_DXT1_EXT
>> can be added to the software driver.
>
> You can enable this yourself by hacking extensions.c, I would bet
> (haven't tested, just looks like it).  That texture compression format
> is protected by patents; it doesn't seem like a good idea to rely on
> your users having it.  From previous responses on a related subject,
> I would say it's unlikely to get enabled by default until the patent
> issue is fixed.
>
> Check the "IP Status" of:
>  http://oss.sgi.com/projects/ogl-sample/registry/EXT/texture_compression_s3tc.txt
>
> I've never played with compressed textures myself, but it seems like
> one can do so in a `generic' way -- just use a non-algorithm-specific
> compression format such as GL_COMPRESSED_RGB_ARB.  ref. ``The OpenGL
> Extensions Guide'':
>
>  http://books.google.com/books?id=VDqw6MK5NJMC&pg=PA89&lpg=PA89&dq=opengl+compressed+texture+formats&source=bl&ots=VbV-79E47J&sig=avobPE2x-usa6DZp4xHFpjIGHNU&hl=en&ei=mPlpSu6cEIzgswPakP2WBQ&sa=X&oi=book_result&ct=result&resnum=1
>
> Cheers,
>
> -tom
>