NativeWindowFactory.createDevice(..) w/ unitID for cloning; DefaultGraphicsDevice: Move ownership (Object) code into base class ensuring same code

NativeWindowFactory.createDevice(..) w/ unitID
- Allows cloning a device instance with same parameter.

DefaultGraphicsDevice: Move ownership (Object) code final into base class ensuring same code
- Rename DefaultGraphicsDevice.swapDeviceHandleAndOwnership() -> swapHandleAndOwnership()

1 files changed, 7 insertions, 3 deletions

diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXContext.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXContext.java
index ec1230894..ab4924516 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXContext.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXContext.java
@@ -206,9 +206,13 @@ public class X11GLXContext extends GLContextImpl {
   @Override
   protected void destroyContextARBImpl(final long ctx) {
     final long display = drawable.getNativeSurface().getDisplayHandle();
-
-    glXReleaseContext(display);
-    GLX.glXDestroyContext(display, ctx);
+    if( 0 != display ) {
+        glXReleaseContext(display);
+        GLX.glXDestroyContext(display, ctx);
+    } else {
+        final AbstractGraphicsDevice adev = drawable.getNativeSurface().getGraphicsConfiguration().getScreen().getDevice();
+        throw new GLException("null display handle from device "+adev);
+    }
   }
   private static final int ctx_arb_attribs_idx_major = 0;
   private static final int ctx_arb_attribs_idx_minor = 2;