JOGL/OSX: Properly utilize NSOpenGLContext update() via ContextUpdater, which only holds the 'update' state now.

Avoid calling updater() for every makeCurrent(), but if view's frame has changed only.
This solves the pixel flickering experienced on OSX.

- GLContextImpl:update() -> drawableUpdatedNotify() w/ comments

- ContextUpdater holds context, view, old view frame and the update state.
  It doesn't issue NSOpenGLContext update() by itself, but allows querying and clearing the update flag.

- MacOSXOnscreenCGLContext impl drawableUpdatedNotify()
   - register via ContextUpdater, and use it if available.

1 files changed, 1 insertions, 0 deletions

diff --git a/make/stub_includes/opengl/macosx-window-system.h b/make/stub_includes/opengl/macosx-window-system.h
index 18cf6c719..8e6d5ba2d 100644
--- a/make/stub_includes/opengl/macosx-window-system.h
+++ b/make/stub_includes/opengl/macosx-window-system.h
@@ -36,6 +36,7 @@ void  updateContext(void* nsContext);
 void  copyContext(void* destContext, void* srcContext, int mask);
 
 void* updateContextRegister(void* nsContext, void* nsView);
+Bool updateContextNeedsUpdate(void* updater);
 void  updateContextUnregister(void* updater);
 
 void* createPBuffer(int renderTarget, int internalFormat, int width, int height);