[Piglit] [PATCH] glsl-fs-fragcoord: incr loops by 16 to probe fewer pixels

[Eric Anholt]

On Wed, 12 Oct 2011 10:38:18 -0600, Brian Paul <brianp at vmware.com> wrote:
> As it was, we were calling glReadPixels 65,536 times to probe all the
> pixels.  This actually took quite a while with some drivers.  Probing
> "only" 256 pixels now is much faster, and good enough.

I've wanted a probe function that takes a rect of expected values
instead of a solid color.  It's on the todo list somewhere...
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