JoglAsyncLoader.java

public class JoglAsyncLoader implements Runnable, GLEventListener {

    LinkedBlockingQueue<LoadingTask> loadingTasks;
    GLContext asyncContext;
    GLOffscreenAutoDrawable asyncOffscreenDrawable;
    Thread loadingThread;

    public JoglAsyncLoader() {
        loadingThread = new Thread(this);
        GLContext renderContext = GLContext.getCurrent();
        asyncOffscreenDrawable = GLDrawableFactory.getFactory(renderContext.getGLDrawable().getGLProfile()).createOffscreenAutoDrawable(null, renderContext.getGLDrawable().getChosenGLCapabilities(), null, 2, 2);
        asyncOffscreenDrawable.setSharedAutoDrawable((GLAutoDrawable) renderContext.getGLDrawable());
        asyncOffscreenDrawable.addGLEventListener(this);


        //Pretty critical lines, if jme calls makeCurrent somewhere the context has to be released first
        renderContext.release();
        asyncOffscreenDrawable.display();
        renderContext.makeCurrent();  //Also very critical since you must make the context again current on jme's render thread
    }

    @Override
    public void init(GLAutoDrawable drawable) {
        asyncContext = drawable.getContext();
        loadingThread.start();
    }


    @Override
    public void run() {
        asyncContext.makeCurrent(); //Binds the async context to the loading thread. Anywhere after this line. GLContext.getCurrent().getGL() gives you a valid gl object to mess around with ;)
        LoadingTask currentTask;
        while (true) {
            try {
                currentTask = loadingTasks.poll(1, TimeUnit.DAYS);
                currentTask.executeGL();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void dispose(GLAutoDrawable drawable) {

    }

    @Override
    public void display(GLAutoDrawable drawable) {

    }

    @Override
    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {

    }


    protected interface LoadingTask {
        void executeGL();
    }
}