[Mesa-dev] glean pointSprite test

[Keith Whitwell]

On Tue, 2010-04-13 at 23:27 -0700, Dave Airlie wrote:
> So I've finished the r300g point sprite code and this test fails,
> fglrx fails the exact same way.
> 
> http://people.freedesktop.org/~airlied/piglit/fglrx/fglrxr500/test_glean__pointSprite.html
> 
> It appears the point size where the texture sampler decides to use the
> next mipmap is different than the swrast/softpipe.
> 
> Any GL experts tell me if this is actually well specified or hw specific?

I think it's pretty well specified.  See the calculations of lambda in
section 3.8 of the GL spec.  I don't know if hardware is as uniform as
that makes out though.

Keith