[Piglit] [PATCH] fs-texelFetchOffset-2D: don't assume undefined values to be solid black

[Eric Anholt]

sroland at vmware.com writes:

> From: Roland Scheidegger <sroland at vmware.com>
>
> core GL specifies out-of-bound texel fetches return undefined results,
> except in a robust context with ARB_robust_buffer_access_behavior supported
> (which is core in 4.3), in which case texel fetch will return 0 (OpenGL 4.3
> compatibility profile, page 387, subsection 11.1.3.2 Texel Fetches).
> Since the test requires neither robust context nor that extension it cannot
> assume any specific result value. In any case even returning zero is not what
> the test expected, since it wanted [0,0,0,1] instead.
> (With this change softpipe passes the test, as it clamps the coords.)
>
> v2: fix black->undefined, formatting, comments

Reviewed-by: Eric Anholt <eric at anholt.net>
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