[Piglit] [PATCH] Add PIGLIT_FORCE_WINDOW environment variable.

[Chad Versace]

On 08/09/2013 11:44 AM, Paul Berry wrote:
> Setting PIGLIT_FORCE_WINDOW=1 causes all piglit windowsystem tests
> (those that weren't invoked with the "-fbo" flag) to show the window
> prior to calling piglit_display().  Setting PIGLIT_FORCE_WINDOW=0 (the
> default) preserves piglit's existing behaviour, which is to only show
> the window when the test is run in "manual" mode (with no "-auto"
> argument supplied).
>
> Setting PIGLIT_FORCE_WINDOW=1 slows down the piglit run, and produces
> more annoying windows on the screen, but it has been observed to
> produce more repeatable results when testing with the nVidia
> proprietary driver for Linux.
> ---
>   .../util/piglit-framework-gl/piglit_winsys_framework.c | 18 +++++++++++++++++-
>   1 file changed, 17 insertions(+), 1 deletion(-)

Reviewed-by: Chad Versace <chad.versace at linux.intel.com>