[Piglit] start of GLSL 1.40 testing

[Eric Anholt]

On Mon, 12 Mar 2012 00:14:37 -0700, Kenneth Graunke <kenneth at whitecape.org> wrote:
> On 03/09/2012 12:58 PM, Eric Anholt wrote:
> [snip]
> > - ARB_compatibility.
> >
> >    I'm not interested in ARB_compatibility, nor do I expect Mesa to
> >    support it, so I haven't done any testing of interactions with it.
> 
> Agreed.  That said, it might be nice to flag the glslparsertests that 
> make sure deprecated functionality is removed with:
> 
> // required_extensions: !GL_ARB_compatibility
> 
> which will make them "skip" should someone ever expose that extension.
> 
> (This needs my newly-posted patch:
>   "glslparsertest: Allow ! in extension list to require non-support.")

Given spec text "If using the extension ARB_compatibility, then the
following variable is also intrinsically declared", I think you have to
explicitly #extension to get the ARB_compat symbols.
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