Re: [Mesa3d-dev] NV_vertex_program parser / code generator

[Brian P. <br...@va...>]

Gareth Hughes wrote:
> 
> Jeff Epler wrote:
> >
> > By the way, can someone tell me what the DST instruction is good for?
> > I don't recall seeing it used in any of their example vector shader
> > snippets.
> 
> It computes the distance attenuation vector from two scalars.  Result is
> (1, d, d^2, 1/d).

It could be used for computing the
GL_CONSTANT/LINEAR/QUADRATIC_ATTENUATION
factors in lighting and the point size for GL_EXT_point_parameters,
among
other things.

-Brian