On Mon, 2004-09-20 at 19:47, Adam Jackson wrote:
> On Monday 20 September 2004 13:17, Amir Bukhari wrote:
> > On Mon, 2004-09-20 at 18:47, Ian Romanick wrote:
> > > I just want to clarify things.  Do you want to write a new application
> > > that renders to off-screen or do you want to redirect the output of an
> > > arbitrary existing appliation to off-screen?  If you want to write a new
> > > application that renders to off-screen, Keith is right.  You want to use
> > > pbuffers.
> >
> > Nope. I don't want to write a new application which rendered to
> > offscreen.
> > All GL application are rendered inside a window (x window), I want to
> > redirect this window, which is associated to GL to offscreen. I need
> > this because I work on 3D Desktop, which use XComposite extension to
> > redirect requested windows to offscreen. so I can manage then in 3D
> > Desktop. GL Applications can't currently be redirect to offscreen by
> > XComposite, because DRI write directly to screen, it didn't use X Server
> > BitBlit operations, which access the framebuffer of the video card.
> 
> You still want pbuffers.  Composite should enable the compmgr to redirect GL 
> contexts to pbuffers without the GL app knowing about it.  This requires more 
> pbuffer support than currently exists in DRI, and also requires extending the 
> Composite code to handle this case.
> 
> You might start by extending Composite to work with the pbuffer support we 
> have in software, which would enable composition for indirect rendering 
> contexts.  It wouldn't be fast, but it'd be a working demo at least.

I am a new to DRI structure and GL. could you explain what pbuffer is
and where it be used?

I know how Composite is implemented and I use it in our Project Looking
Glass, but my knowledge on GL and DRI is basicly as User not a developer
in DRI. as I will work in this issue I will get slowly inside DRI.



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