New glucose code

[Alan Hourihane]

On Wed, 2007-03-28 at 15:29 +0200, David Reveman wrote:
> On Wed, 2007-03-28 at 16:07 +0100, Alan Hourihane wrote: 
> > Carrying on from Zack's original idea and code, I've released some new
> > code on the glucose-2 branch which goes all the way to allowing xorg
> > drivers to use the xgl acceleration paths.
> > 
> > It's a simple one line call to initialize glucose in the driver as I
> > mentioned in the commit message. It's...
> > 
> > glucoseScreenInit(pScreen);
> > 
> > So, initialization only need to change such as .....
> > 
> > if (!exa && !xaa)
> >     glucoseScreenInit(pScreen);
> > else if (!exa)
> >     driversXAAinit(...);
> > else
> >     driversEXAinit(...);
> > 
> > It also works with Mesa's software renderer too, but is obviously slow,
> > but useful as a testing harness.
> > 
> > There's still a few niggly issues such as server shutdown causes
> > failures, but I'm working on those. There are also some rendering
> > glitches depending on which 3D driver you use, but they could well be
> > problems in the respective 3D drivers. Usually good to test with Mesa by
> > disabling DRI to check this.
> > 
> > As I've said, all the new code is on the glucose-2 branch, but I'll be
> > working to stabilize it and hopefully merge to the trunk in the future.
> > 
> > If there's any comments, etc, post away, and feel free to bang on the
> > code.
> > 
> > Alan.
> 
> Great work Alan! This is exactly what I've been wanting to do for some
> time now but never got around to it.
> 
> Do you want me to move the glucose glitz backend into the glitz repo?

I'm not sure it makes a sense to be in glitz as it's not a client-side
piece of code. It's server-side only. But then there's the glitz_gl.h
and glitzint.h header files that I've had to replicate in the
server-side code. So I'm kinda torn on this. If anyone here has
preferences it'd be good to hear them. Otherwise I guess I'd be o.k. in
moving them into glitz, seeing as glucose needs glitz anyway.

> How about moving the xgl code currently in xserver/hw/xgl to xserver/xgl
> and avoid symlinking and building xgl sources in glucose directory?

I'd probably create a xserver/xgl directory and build a libxgl.a so that
xserver/hw/xgl can link with it and so can xserver/glucose. That should
avoid the symlinking as well.

> The XF86 module part in xserver/glucose/glucose.c, if not all of
> glucose.c, really belongs in a xserver/hw/xfree86/glucose directory,
> right?

Not really. It's server independent. So it doesn't need to be part of
the xfree86 ddx. It could just as easily be used in the Darwin or
Windows ddx to provide acceleration on those servers.

> I'll start playing with this asap and I'll definitely help you merge it
> to trunk. Hooking up the xgl's GLX extension code and having GLX_EXT_tfp
> and all that just work is going to be a lot of fun.

Great.

Alan.