a couple of follow-up questions On Wed, Mar 4, 2009 at 1:02 AM, Chris Wilson <[email protected]>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 > >
_______________________________________________ xorg mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/xorg
