Re: [Mesa3d-users] Software driver support

[tom f. <tf...@al...>]

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