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List:       kde-bugs-dist
Subject:    [Bug 222872] snow + cube breaks KDE-4.3.4
From:       Thomas Lübking  <thomas.luebking () web ! de>
Date:       2010-01-21 17:19:32
Message-ID: 20100121171932.A37A630467 () immanuel ! kde ! org
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https://bugs.kde.org/show_bug.cgi?id=222872





--- Comment #18 from Thomas Lübking <thomas luebking web de>  2010-01-21 18:19:28 ---
=)

comment #15 actually confirms that there's a problem between the non-shader
implementation of the snow effect and the cube that i can reproduce here
(nvidia, i just moved the shaders out of the way to force legacy GL)

I'll try to bisect this later this day.
Please be prepared that there's a chance that due to the given plugin
renderstack this collision is not resolvable (in which case the effects shall
be prevented to run next to each other)

However, there's a problem with intel, as suspending compostion immediately
clears the stage here (this _is_ driver internal ;-)

-- sidenote:
The gma950 series might cause further troubles, as the (level 2.0) fragment
shaders appear to be rather "theoretical" and limited to _3_ texture reads.
the vertex shaders (which afaics are crucial for the snow) are implemented in
the driver (i.e. on the CPU) as well as T&L (what is frankly a shame for intel
;-P )
the limited bandwidth (it's probably connected to shared RAM) should do the
rest.

so please don't expect wonders on the 3D side and watch the CPU usage of
effects (being "stolen" from the rest of the system)

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