Posted by gouessej on Jan 19, 2018; 12:44pm
URL: https://forum.jogamp.org/JOGL-Swing-Multiple-viewports-tp4038537p4038555.html

The answer should be here but it's not crystal clear to me:
https://github.com/sgothel/jogl/blob/master/src/jogl/classes/com/jogamp/opengl/awt/GLJPanel.java#L1877