[Piglit] Faster piglit with probe_rect_*

[Tom Stellard]

On Wed, Sep 29, 2010 at 04:37:48AM +0200, Marek Olšák wrote:
> Hi,
> 
> I've optimized piglit by reducing the number of glReadPixels calls in tests
> which probe from hundreds to hundreds of thousands of pixels (the fbo tests
> are the worst ones). It touches shader_runner and 26 other tests. The
> quick-driver.tests profile is significantly faster now (especially for GPUs
> which store framebuffers in VRAM). If there are no concerns, I'll merge this
> on thursday evening CEST.

Very nice!  Here are the run times for quick-driver.tests on my RC410:

master:
real    16m18.203s
user    6m39.427s
sys     6m18.498s

probe-rect:
real    6m51.260s
user    4m8.668s
sys     1m5.706s

-Tom