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List:       kwin
Subject:    Re: Compositing manager
From:       Zack Rusin <zack () kde ! org>
Date:       2006-07-20 12:20:58
Message-ID: 190401011410.11276.zack () kde ! org
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Hi everyone, 

I skimped over this thread and there's a lot of missinformation here so 
I'll try to send a few replies clarifying how those things work. If you 
have any further questions let me know.

On Friday 14 July 2006 21:24, Thomas Lübking wrote:
> Am Freitag, 14. Juli 2006 19:23 schrieb Matias Valdenegro T.:
> > I don't agree that Effects should work in all scenes, as OpenGL
> > compositing is very different in implementation and capabilities as
> > XRender compositing (See Shaders and GLSL).
>
> well, i do =)
> YES. XRender support is (currently more than) poor. Even nVidia's is
> broken on 7.1
> YES. XRender doesn't support shaders - but openGL < 2.0 (afaik)
> neither (you'd need to call some shader language. If i missed the
> part in the latter OpenGL API (i think the latest a took a look on
> was 1.3) - apologises, and please correct me)

Not quite. GLSL was introduced as an extension in 1.5 and is part of the 
core OpenGL 2.0. 

> However,
> 1. OpenGL won't be /real/ fun before a X server on top of OpenGL
> (like EGL) is (commnly and fully) avaliable (or the texture from
> pixmap extension is übergood)

That's not true at all. EGL based server is not going to happen for a 
long time and is not needed for anything that composition manager 
needs. Right now there's no adventage to having EGL underlaying the 
server.

> 2. XRender could be accelerated in the future (i don't really believe
> anymore, but who knows...)

XRender is very well accelerated on ATI r200 and in the exa branch of 
the intel driver.

> I guess what Lubos means is: Say you wanna scale a window down.
> Then scaling itself is part of the window manager (so afterwards the
> window is scaled and the WM/CM properly knows about), while the
> appereance of the scale (some swwwussshhhh FX, or the window could
> get punched, or rotate, or scale with different speed on each axis,
> or.....) is job to the FX plugin. Same on (un)mapping, movement,
> Desktop change or whatever.

I wouldn't be so quick to say that. Remember that coordinate 
transformation is going to most likely become part of the Composite 
extension (Keith already has code for that).

z

-- 
Jesus is coming, everyone look busy.

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