Re: [matplotlib-devel] Kivy backend

[Thomas C. <tca...@gm...>]

MEP 25 is working towards providing a way to serialize the contents of a
figure in a more controlled way.  The main target of this is
saving/reopening figures and export to bokeh/plotly/d3, but I think this
would also work well for exporting everything off to an opengl backend.

Tom

On Fri, Mar 13, 2015 at 1:09 PM Nicolas P. Rougier <Nic...@in...>
wrote:

>
> It might be difficult to stick to matplotlib architecture and still
> benefit from OpenGL speed.
> There are a lot of GL techniques that speed up things a lot but are are
> not really compatible.
>
> For example, isolines, quiver plots, image interpolations and most
> transformations can be handled directly by the GPU
> (see http://glumpy.github.io/gallery.html)
>
> But we'll try to use matplotlib public api such that things will be mostly
> transparent for the user
>
> Nicolas
>
> > On 13 Mar 2015, at 17:33, Benjamin Root <ben...@ou...> wrote:
> >
> > +1 on an OpenGL backend! Especially if I can off-load a lot of mplot3d
> stuff to it! Does vispy have any plans to eventually bring that into
> mainline matplotlib, or does it break too much with the standard set of
> backends to make sense in matplotlib (or maybe it is too much of a
> maintenance/packaging burden?)
> >
> > Ben Root
> >
> > On Fri, Mar 13, 2015 at 12:12 PM, Cyrille Rossant <
> cyr...@gm...> wrote:
> > Kivy is all built on OpenGL, so it would probably be pretty
> straightforward to generate teh image with AGG, then dump it to the screen
> as an OpenGL texture. But it would be a bit sad to not take advantage of
> OpenGL at all in that process. (and getting AGG to work with Kivy may be
> less than trivial...)
> >
> > Note that vector graphics in OpenGL is a serious pain, but maybe Kivy
> has some stuff to help?
> >
> > Also, the MPL back-end structure wasn't designed to push much of the
> transforming, etc to the back -end, which is too bad, as that's what OpenGL
> does well.
> >
> > But I'd still take a look at the work done to make a real OpenGL
> back-end -- not sure how far that got, but worth a look.
> >
> > Or look at http://vispy.org/ -- and give up in MPL :-( -- or maybe not!
> form teh vispy docs:
> >
> > "Vispy now ships a very basic and experimental OpenGL backend for
> matplotlib."
> >
> >
> > Yes, and we plan to work on this backend in the next few months. We
> might have a couple of GSoC students working partly on the OpenGL MPL
> backend and possibly on Kivy integration.
> >
> >
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