[Piglit] [PATCH] glsl-1.40: Expect shadow comparison alpha to be 1.0

[Eric Anholt]

Ian Romanick <idr at freedesktop.org> writes:

> From: Ian Romanick <ian.d.romanick at intel.com>
>
> Appendix E.1 (Profiles and Deprecated Features of OpenGL 3.0) of the
> OpenGL 3.1 spec says:
>
>     • Depth texture mode - DEPTH TEXTURE MODE. Section 3.9.14 is to be
>       changed so that r is returned to texture samplers directly, and
>       the OpenGL Shading Language 1.30 Specification is to be changed so
>       that (r, r, r, 1) is always returned from depth texture samplers
>       in this case.

If the test relies on GL core-not-compat behavior, we should specify the
version in the requirements.  Oh, but we don't have a way to say "core"
in shader_runner :(
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