Added XTrans (Accelerated Transitions) demo, which uses the

Java2D/JOGL bridge in a completely different way than the GLJPanel.
The OffscreenDesktopPane and associated classes are an attempt at a
generalized mechanism for supporting off-screen rendering of Swing
components within a JDesktopPane and later composition (by subclasses)
of those components' contents on-screen. The XTDesktopPane is intended
to be a drop-in replacement for the JDesktopPane which supports
OpenGL-accelerated animated transitions for components added to and
removed from it.

The XTBasicTransitionManager and XTBasicTransition classes define the
default implementation of animated transition effects, supporting a
combination of fade, rotation and scroll effects. More, and arbitrary,
transitions are certainly possible. More experimentation by the
community is needed.

This demo is intended as a first step toward a more generalized
framework in which arbitrary Swing rendering can be performed via the
Java2D/JOGL bridge.

Bugs remain, such as needing to preserve portions of the
OffscreenDesktopManager's back buffer after components have been made
not visible (during the process of closing them) in order to properly
animate their close effects. The XTrans demo works properly in most
cases but the JRefract demo (which now accepts an -xt command line
argument to install an XTDesktopPane instead of a JDesktopPane) does
not. More work also remains to be done, in particular on the layout of
components on the back buffer. A 2D bin-packing algorithm is needed.

When the Java2D/JOGL bridge supports Java2D's use of the Frame Buffer
Object extension (and, implicitly, render-to-texture on all platforms)
the glCopyTexSubImage2D operation to copy the off-screen back buffer
to a VolatileImage can disappear; this is the principal expensive
operation when the contents change of components which have been added
to the OffscreenDesktopPane.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/../svn-server-sync/jogl-demos/branches/JSR-231@140 3298f667-5e0e-4b4a-8ed4-a3559d26a5f4

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