How to use GLDrawableFactory.createExternalContext() ?

OpenGL Development JOGL Development
#1

Hello,

I would like to draw OpenGL elements through JOGL inside an external OPenGL context / drawable created by a C program. But I think I did not understand very well how to use this. What I do is:

  • create a JVM and launch my main program by JNI through the C program (works OK)

  • create a window in my C program, initialize the OpenGL context and associated stuff, and when I’m ready:

  • call my Java program through JNI and perform the associated code:

          GLDrawableFactory factory = GLDrawableFactory.getFactory();
      if (factory.canCreateExternalGLDrawable()) {
          GLContext context = factory.createExternalGLContext();
          context.makeCurrent();
          GLDrawable drawable = factory.createExternalGLDrawable();
          GLCapabilities caps = drawable.getChosenGLCapabilities();
          DefaultGLCapabilitiesChooser chooser = new DefaultGLCapabilitiesChooser();
          GLJPanel panel = new GLJPanel(caps, chooser, context);
          panel.createContext(context);
     }

I get an exception in my GLJPanel context creation because it seems that there is no Pbuffer available (NullPOinter Exception). Unfortunately, I can’t get the system.out/err messages in the JOGL library because I’m in a Windowed environement.

I’m sure I’m doing it all wrong, but I really don’t know how to get it right.

Does somebody have a clue on what is faulty in my code (it sure is).

Hervé

#2

Never mind, it’s working now, I have my answer :wink:
However, I still have a (less urgent) question:
is it possible to create an external context, and still use a GLCanvas or GLJPanel (looking at the API, I really don’t know if that can be done), or is it necessary then to create a custom component which use the context under the hood ?