[Piglit] [PATCH] Verify the functionality of glDrawBuffer with different color buffer modes

[Eric Anholt]

On Fri,  6 Jan 2012 16:25:52 -0800, Anuj Phogat <anuj.phogat at gmail.com> wrote:
> This test case is used to reproduce and verify the fix for segmentation fault
> cause by glDrawBuffer(GL_FRONT_AND_BACK) in GLUT_DOUBLE_BUFFER mode.
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=44153

This doesn't appear to verify the functionality, just that it doesn't
segfault.  With this testcase, we could just drop GL_FRONT_AND_BACK
rendering on the floor as the "fix".  Could you test the actual
rendering to the two buffers as part of the test, instead?
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