[Bug 89156] r300g: GL_COMPRESSED_RED_RGTC1 / ATI1N support broken

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=89156

--- Comment #6 from Stefan Dösinger <stefandoesinger@gmx.at> ---
(In reply to Marek Olšák from comment #5)
> So it's a compiler bug.
In which sense? Is there something in the spec that tells me I should expect
garbage when I use texture2D().xxxx? Or is this something the driver tells the
compiler and the compiler is supposed to generate a swizzle-free texture2D
statement?

> > static const char ati1n_data[] =
> > {
> >     /* A 4x4 texture with the color component at 50%. */
> >     0x7f, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> > };
> 
> That's expected. ATI1N operates at lower precision. I'm afraid I can't
> change that.
Windows gives me a proper value (0x7f, which is pretty close to 0x80). Do you
have any idea how it does that?

I can try to find a scheme behind the imprecision if it helps you. There may be
something like an off by one error that the driver can account for.

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