[Mesa-dev] [PATCH 00/10] glsl: Implement varying packing.

Eric Anholt eric at anholt.net
Wed Dec 12 00:02:19 PST 2012

Paul Berry <stereotype441 at gmail.com> writes:

> This patch series adds varying packing to Mesa, so that we can handle
> varyings composed of things other than vec4's without using up extra
> varying components.

Results for glbenchmark 2.7 at 320x240 (units of fps):

    N           Min           Max        Median           Avg        Stddev
x 109            86            87            86     86.027523    0.16435709
+ 109            86            87            87     86.963303    0.18888589
Difference at 95.0% confidence
	0.93578 +/- 0.0470052
	1.08777% +/- 0.0546397%
	(Student's t, pooled s = 0.177047)

I chose a tiny resolution here to try and focus on the path that we
think this will help in (clipping overhead reduction).  The stupid app
prints an integer fps, so it can be hard to get any signal out of small
changes at higher resolutions.
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