RE: qwt and openGL on Android

[Suciu, A. <Adr...@an...>]

Hello Uwe,

Further analysis shows that actually the constructor used in the examples enables multisampling by default -  https://sourceforge.net/p/qwt/git/ci/develop/tree/src/qwt_plot_opengl_canvas.cpp#l53. This does not play nice Android's default openGL context, I guess (I'm not an expert (?))
Is there any reason you enable multisampling ?

I created 2 patches
https://github.com/cseci/qwt/commit/d6ef48eef43756b7b29dfae21949ece31d3b81bb - constructor fix
https://github.com/cseci/qwt/commit/51fb4d53a533b0168f40ce65922ef41b57f1a924 - examples immediate paint fix

For the first patch only tackles Android, but in my opinion the fmt.setFormat(4) should be removed completely. If you add them, can you please also add them to the qwt-multiaxes branch.
Besides this small hiccup, everything works great, and the performance gain is huge! Thanks a lot !

-Adrian

-----Original Message-----
From: Uwe Rathmann <Uwe...@ti...> 
Sent: Monday, January 24, 2022 9:26 AM
To: List for both Qwt users and developers <qwt...@li...>
Subject: Re: qwt and openGL on Android

[External]

Hi Adrian,

thanks for the analysis - do you have a patch for me ?

Uwe


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