[Piglit] [Bug 99293] New: piglit test for render reordering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99293

            Bug ID: 99293
           Summary: piglit test for render reordering
           Product: piglit
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: tests
          Assignee: piglit at lists.freedesktop.org
          Reporter: robclark at freedesktop.org
        QA Contact: piglit at lists.freedesktop.org

freedreno and vc4 have support to re-order draw calls to reduce tile passes and
improve memory efficiency[1][2].  We should probably have a piglit test(s) for
this.

Probably for simple case of rendering to FBO and then sampling from, we can do
something that iterates between rendering to FBO and then sampling from, so
that each step overwrites one component (ie. x, y, z, or w) and taking the rest
of the components from the previous FBO sampled as a texture?

For gl(es)3+ type features, we probably need to add things like using a prior
TF output bo as a UBO, and other things I'm not thinking of right now.

[1]
http://bloggingthemonkey.blogspot.com/2016/07/dirty-tricks-for-moar-fps.html
[2] http://anholt.livejournal.com/47610.html

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