https://forum.qt.io/topic/22389/how-to-make-multiple-qglwidgets-share-the-same-qglcontext
How to make multiple QGLWidgets share the same QGLContext? | Qt Forum
May 3, 2015 - Maybe this is an old question, but I can not find any workable solution. I have tried the approach as follow according to the Qt document. Create a QGLContex...
how to makethe samemultiple