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diff --git a/src/jogl/classes/javax/media/opengl/GLEventListener2.java b/src/jogl/classes/javax/media/opengl/GLEventListener2.java
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+++ b/src/jogl/classes/javax/media/opengl/GLEventListener2.java
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+/**
+ * Copyright 2014 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package javax.media.opengl;
+
+/**
+ * Extended {@link GLEventListener} interface
+ * supporting more fine grained control over the implementation.
+ */
+public interface GLEventListener2 extends GLEventListener {
+    /**
+     * {@link #display(GLAutoDrawable, int) display flag}: Repeat last produced image.
+     * <p>
+     * While a repeated frame shall produce the same artifacts as the last <code>display</code> call,
+     * e.g. not change animated objects, it shall reflect the {@link #setProjectionModelview(GLAutoDrawable, float[], float[]) current matrix}.
+     * </p>
+     */
+    public static final int DISPLAY_REPEAT    = 1 << 0;
+
+    /**
+     * {@link #display(GLAutoDrawable, int) display flag}: Do not clear any target buffer, e.g. color-, depth- or stencil-buffers.
+     */
+    public static final int DISPLAY_DONTCLEAR = 1 << 1;
+
+    /**
+     * Extended {@link #display(GLAutoDrawable) display} method,
+     * allowing to pass a display flag, e.g. {@link #DISPLAY_REPEAT} or {@link #DISPLAY_DONTCLEAR}.
+     * <p>
+     * Method is usually called by a custom rendering loop,
+     * e.g. for manual stereo rendering or the like.
+     * </p>
+     * @param drawable
+     * @param flags
+     */
+    public void display(final GLAutoDrawable drawable, final int flags);
+
+    /**
+     * Might be called instead of {@link #reshape(GLAutoDrawable, int, int, int, int) reshape}
+     * to specify a custom projection and modelview matrix determined by the caller.
+     * <p>
+     * Method is usually called by a custom rendering loop,
+     * e.g. for manual stereo rendering or the like.
+     * </p>
+     *
+     * @param drawable the triggering {@link GLAutoDrawable}
+     * @param mat4Projection float[16] projection matrix
+     * @param mat4Modelview float[16] modelview matrix
+     */
+    public void setProjectionModelview(final GLAutoDrawable drawable, final float[] mat4Projection, final float[] mat4Modelview);
+}