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List:       kwin
Subject:    Re: Idea for conflicts with shadow effect
From:       "Lucas Murray" <lmurray () undefinedfire ! com>
Date:       2008-08-08 7:44:16
Message-ID: 74544e5c0808080044o2f57a5e9y8e2343b76a57fd58 () mail ! gmail ! com
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On Sat, Jul 12, 2008 at 7:39 PM, Martin Graesslin
<ubuntu@martin-graesslin.com> wrote:
> On Saturday 12 July 2008 04:47:02 Lucas Murray wrote:
>> Is there any way of efficiently creating shadows with a shader? Doing
>> so may also allow non-rectangular windows.
> Yes that would be possible, but I don't think it is a good idea as shaders are
> not supported by all hardware. For example my notebook (Ati) does not support
> shaders. And shadows should also be possible with XRender.
>
> Btw I like Lubos' suggestion with introducing a new WindowQuadType. That's a
> very elegant way. And with enough quads it should be possible to have non-
> rectangular shows as well, although it could be complicated.

It does not work--there is simply no way to efficiently use a
region-based shadow for shaped windows. It does work though, it just
takes the framerate down to <1fps due to the massive amount of
processing required to determine which quads are on the outside of the
shape and try to expand those edges without overlapping other expanded
shadow quads in real-time. The outer-edge data cannot be cached either
as if you activate an effect that creates new edges you need to once
again recalculate everything once per frame anyway.

I think the only way to allow shaped windows (Compiz hasn't been able
to do it either IIRC) is to rely on a shader and then have a fallback
that works off a merge of Martin's quad type patch and my quad split
reason patch.
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