Bug 37234

Summary:	gears of glxgears change brightness
Product:	Mesa	Reporter:	almos <aaalmosss>
Component:	Mesa core	Assignee:	mesa-dev
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description almos 2011-05-15 11:21:59 UTC

The brightness of the gear faces varies periodically as the gears rotate. I think this problem started to appear around the same time as #36282, but I'm not sure. This affects both r300g and llvmpipe.

May be unrelated, but this is printed to the console:
Mesa: User error: GL_INVALID_OPERATION in glSampleMapATI(outsideShader)

Some other mesa demos have rendering errors, too. I think those are related, and most of them are correct with mesa 7.10.2. Should I add them here, or open separate reports?

Comment 1 Alexandre Demers 2011-05-15 14:50:18 UTC

Also seen it when running in indirect rendering.

Comment 2 Marek Olšák 2011-05-15 18:22:00 UTC

almos, either your libGL or the drivers were messed up during compilation or you have non-matching versions thereof (like an old libGL and a new driver). Delete and recompile everything.

It's very unlikely that Mesa couldn't run glxgears.

Comment 3 almos 2011-05-16 02:51:51 UTC

(In reply to comment #2)
> almos, either your libGL or the drivers were messed up during compilation or
> you have non-matching versions thereof (like an old libGL and a new driver).
> Delete and recompile everything.
> 
> It's very unlikely that Mesa couldn't run glxgears.

Now I tried all combinations. The color of the faces of the gears are the following (copied from OOo Calc, cell separator is ';'):
with shared glapi;;
;system libGL (7.10.2);compiled libGL (LD_LIBRARY_PATH=/home/almos/sources/mesa/lib/)
r300g;linear shift between normal color and darker, periodically;alternate between the dark color and a different one (red gear is yellow, blue is white, green is cyan)
llvmpipe;linear shift between normal color and darker, periodically;always white
;;
without shared glapi;;
;system libGL (7.10.2);compiled libGL (LD_LIBRARY_PATH=/home/almos/sources/mesa/lib/)
r300g;linear shift between normal color and darker, periodically;correct rendering
llvmpipe;linear shift between normal color and darker, periodically;correct rendering

The other demos I mentioned in the initial report are geartrain and gloss. Both render correctly, when gears does.

Comment 4 Fabio Pedretti 2011-06-09 01:44:11 UTC

This is likely a duplicate of bug #36282 which is fixed now.

Comment 5 almos 2011-06-11 03:38:17 UTC

I tried all combinations again with current mesa, and gears is rendered correctly in each case.

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