[Glamor] Trapezoid performance regression with the shader enabled.

[Zhigang Gong]

Hi Junyan,

 

After workaround the glsl-like problem, I can get correct rendering with
trapezoid shader enabled.

Then I measured the performance and found that it does accelerate some cases
significantly, but

also bring some major performance regressions, here is a summary, please
check it out.

 

old: cairo-trace-glamor

new: cairo-trace-glamor-trapezoid

Speedups

========

xlib             grads-heat-map  1241.46 (1243.12 0.82%) -> 593.86 (593.89
12.62%):  2.09x speedup

xlib           firefox-fishbowl  35292.75 (35378.87 0.53%) -> 25675.22
(25710.04 0.80%):  1.37x speedup

xlib          firefox-asteroids  6902.64 (7127.80 1.73%) -> 5518.59 (5843.95
2.74%):  1.25x speedup

xlib           firefox-fishtank  33430.00 (33504.70 0.15%) -> 28612.69
(28622.39 0.05%):  1.17x speedup

xlib       firefox-planet-gnome  7187.17 (7188.44 0.46%) -> 6544.22 (6555.78
0.53%):  1.10x speedup

Slowdowns

=========

xlib                  evolution  1769.50 (1774.23 0.13%) -> 1877.39 (1891.87
4.37%):  1.06x slowdown

xlib       firefox-canvas-alpha  29717.59 (29761.29 0.19%) -> 32037.14
(32108.83 0.42%):  1.08x slowdown

xlib             firefox-canvas  42736.86 (43217.24 1.21%) -> 46611.94
(46761.75 0.43%):  1.09x slowdown

xlib          firefox-talos-svg  13468.38 (13653.09 0.65%) -> 15275.94
(15280.97 0.11%):  1.13x slowdown

xlib       gnome-system-monitor  1408.31 (1417.22 0.87%) -> 1839.00 (1863.20
0.69%):  1.31x slowdown

xlib         swfdec-giant-steps  1733.63 (1751.49 0.84%) -> 2280.65 (2284.43
9.88%):  1.32x slowdown

xlib          firefox-paintball  18133.06 (18139.63 0.06%) -> 32112.83
(32125.89 0.04%):  1.77x slowdown

 

 

As we discussed this afternoon, I'd like to release the version 0.5 by the
end of next week. I hope we can

fix the regression before that time.

 

Thanks.

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