Cairo with glitz backend

[Bipin George Mathew]

a couple of follow-up questions

On Wed, Mar 4, 2009 at 1:02 AM, Chris Wilson <chris at chris-wilson.co.uk>wrote:

> On Tue, 2009-03-03 at 17:24 -0800, Bipin George Mathew wrote:
> > I was looking into way of accelerating Cairo using a glitz-backend and
> > had a bunch of related questions:
> >
> > - What is the current status of glitz? Is anyone working on it?
>
> People contribute patches occasionally, just recently we received quite
> a few to address some bit rot and improve conformance.
>
> > - From the paper here
> >
> http://www.usenix.org/events/usenix04/tech/freenix/full_papers/nilsson/nilsson_html/index.html,
> it looks like glitz was experimental. What are the areas that needs to be
> worked on in-order to make it mainstream?
>
> For glitz to be considered supported we essentially need two things:
> 1. It should pass the test suite.


What test suite are we talking about here?


> 2. A responsive and long-term maintainer (for both the cairo backend the
> glitz library).
>


>
> > - What are the other options of accelerating Cairo?
>
> Glitz was an experiment to implement the XRender protocol on top of
> OpenGL. This may not be the best approach to take. Instead the emphasis
> has shifted onto using the "new" (introduced into cairo after glitz was
> conceived) high level backend api

Is this an OpenGl based API we talking about here?


> to offload as much of the drawing
> operation as possible to the h/w. (Or at least entertain that
> possibility and investigate different solutions.)
>
> So currently aside from glitz, there are experiments to show that simply
> doing basic compositing using OpenGL can be much faster than XRender:
> http://cgit.freedesktop.org/~anholt/cairo/log/?h=gl<http://cgit.freedesktop.org/%7Eanholt/cairo/log/?h=gl>and
> http://cgit.freedesktop.org/~ickle/cairo/log/?h=opengl<http://cgit.freedesktop.org/%7Eickle/cairo/log/?h=opengl>A slightly more
> ambitious (though it does have quite a few fundamental flaws of its own,
> chiefly among those is that he hasn't asked anyone from the cairo
> community to review it...)
> http://github.com/akyrtzi/cairo-gral/tree/master And my favourite
> (slightly biased since I'm the author ;-) is an example of what you can
> achieve with direct rendering:
> http://cgit.freedesktop.org/~ickle/cairo/log/?h=drm<http://cgit.freedesktop.org/%7Eickle/cairo/log/?h=drm>which, I claim, is
> just about as fast as you can make cairo on an eee/i915. (I welcome any
> patches to make it, and cairo, even faster :-)
>
> -ickle
>
>
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