[Piglit] [PATCH] fbo-maxsize: minor test improvements

[Eric Anholt]

Brian Paul <brianp at vmware.com> writes:

> Clear the large FBO to a non-black color and probe for it in the
> final test.
>
> This uncovers a bug in Mesa's llvmpipe driver where we ran out of
> bin commmand memory and skipped some tiles, leaving them black.
>
> Setting the clear color to white (and actually clearing the FBO)
> helps to detect that.

Was this unique to clear operations?  Otherwise, why change from 4 pixel
probes to 5, instead of just doing some drawing that covers the whole
screen and probing the whole screen?
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