Cairo backends and OpenGL use

Francesco_Faccenda · July 5, 2018, 12:37pm

Dear all,

I am writing
to you because of an issue regarding the use of OpenGL in cairo backends from matplotlib. As I set
a cairo backend with the instruction matplotlib.Use(“WXCairo”), there is evidence
that the graphic computation is not being carried out by the graphic card.

Since the
significative amount of plotted data, the chart are heavy and slow when the
user is interacting with them, so a graphic acceleration would be really
appreciated.

As a side
note, I am embedding matplotlib canvas on wxPython stages, that’s why I choose
WXCairo as backend, at first. However, setting other backends (GTKCario, TKCairo, Qt4Cairo,
Qt5Cairo etc) while still using wx, still provides a working code without any errors,
even if the graphic card is still not exploited.

Is this an
actual malfunction or am I missing something? What should I do to run matplotlib
graphic computation on a graphic card? Thank you in advance.

Best regards,

Francesco Faccenda

_Chris.Barker · July 6, 2018, 10:21pm

MPL does not have a backend that used “real” GPU rendering.

And it’s very hard to make one, due to the really low level nature of OpenGL and similar APIs, and MPL’s rendering model.

You might try VisPy — it was designed for OpenGL from the start.

-CHB

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On Jul 5, 2018, at 5:37 AM, Francesco Faccenda <f.faccenda86@…149…> wrote: