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I'm trying to transition Piglit from using GLUT to using Waffle. This
requires killing all uses of GLUT functions, one-by-one.

Two remaining tests called glutSwapBuffers directly, read-front and
texline, for which piglit_preset_results is unsuitable. These tests call
glReadPixels on the front buffer. This patch replaces those calls with
a new wrapper, piglit_swap_buffers.
Reviewed-and-tested-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Tested-by: Paul Berry <stereotype441@gmail.com>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>

Move piglit-util.* to piglit-util-gl-common.*
Signed-off-by: Blaž Tomažič <blaz.tomazic@gmail.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>

Each test that did not define main() now does so using
PIGLIT_GL_TEST_MAIN().
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>

It was displaying something that would distinguish left/right, but
that's a much less likely failure mode.  I was concerned while working
on rb mapping for swrast.

This saves a giant pile of code, and should encourage cleaner testcases
from people writing tests in the future.

MSVC 4255 warning:
'function' : no function prototype given: converting '()' to '(void)'

Include GLUT/glut.h on Mac OS.

My first fix to intel fixed the previous iteration of read-front, but
glean was now complaining that it was reading the wrong results.  It looks
like DRI2 isn't catching the updates to the front due to swap in its fake
front.

Doesn't actually reveal any of the regressions I'm looking for.

Based on a hint of a failure from oglconform, and catches a regression
in mesa_7_4_branch.

oglconform indicated that there was a problem in this area.  This test works,
though.