This putback attempts to address the following issues:

Issue 59: GLContext Leak
Issue 67: Java/Jogl app hangs some systems, not others, during reshape.
Issue 69: Error on window resize
Issue 89: Losing Backbuffer when Resizing/Moving a window

The primary change is to support handing off of the display()
implementation to the AWT event queue thread via a new class called
SingleThreadedWorkaround in the impl package. This was done to cause
the AWT's reshape code to execute on the same thread as all other
OpenGL rendering without changing the threading model (e.g., Animator
and the ability to manually call display()) visible to the end user.
This set of changes appears to work around the problems seen on ATI
cards with random corruption when resizing animating windows due to
multithreading bugs in the drivers. More testing by a larger community
will confirm this fix. Currently the workaround is enabled by default
on ATI cards.

A secondary but related change is to properly destroy the OpenGL
context when a heavyweight component is removed from its container.
In order to implement the above workaround, it was necessary to
override addNotify and removeNotify to properly track whether
GLCanvases were realized; at that point it was a fairly small step to
properly delete and recreate OpenGL contexts. The previous heuristics
which attempted to determine when a heavyweight had been realized have
been removed. A new demo, TestContextDestruction, exercises the new
functionality. It does still appear to exhibit resource leaks,
however; removing and re-adding the GLCanvas from its parent multiple
times causes the system to eventually slow down significantly. More
work is needed in this area.  However, the demo does now execute as
opposed to throwing an exception which was the previous behavior.

The current code has been tested on Windows on NVidia hardware with
all existing demos with the workaround both enabled and disabled, and
on ATI hardware with the existing compatible demos with the workaround
enabled. The new abstract method in GLContext, destroyImpl(), has been
implemented but not yet tested on X11 and Mac OS X.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@132 232f8b59-042b-4e1e-8c03-345bb8c30851

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