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+/*
+ * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution 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.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package demos.context;
+
+import com.sun.opengl.util.gl2.GLUT;
+import java.awt.BorderLayout;
+import java.awt.Canvas;
+import java.awt.Graphics;
+import java.awt.GraphicsConfiguration;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.media.nativewindow.*;
+import javax.media.nativewindow.awt.*;
+import javax.media.opengl.*;
+import javax.media.opengl.awt.*;
+import javax.media.opengl.glu.GLU;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+
+
+
+/** This demo illustrates the use of the GLDrawable and GLContext APIs
+    to create two OpenGL contexts for the same Canvas. The red and
+    blue portions of the canvas are drawn with separate OpenGL
+    contexts. The front and back buffers of the GLDrawable are swapped
+    using the GLDrawable.swapBuffers() API. */
+
+public class DualContext extends Canvas {
+
+  private GLDrawable drawable;
+  private GLContext  context1;
+  private GLContext  context2;
+  private GLU        glu;
+  private GLUT       glut;
+  private int        repaintNum;
+
+  public DualContext(AWTGraphicsConfiguration config) {
+    super(unwrap(config));
+    NativeWindow win = NativeWindowFactory.getFactory(getClass()).getNativeWindow(this, config);
+    GLCapabilities glCaps = (GLCapabilities) win.getGraphicsConfiguration().getNativeGraphicsConfiguration().getChosenCapabilities();
+    drawable = GLDrawableFactory.getFactory(glCaps.getGLProfile()).createGLDrawable(win);
+    context1 = drawable.createContext(null);
+    context2 = drawable.createContext(null);
+    glu = new GLU();
+    glut = new GLUT();
+  }
+
+  public void addNotify() {
+    super.addNotify();
+    drawable.setRealized(true);
+  }
+
+  public void removeNotify() {
+    context1.destroy();
+    context2.destroy();
+    drawable.setRealized(false);
+  }
+
+  public void paint(Graphics g) {
+    int width = getWidth();
+    int height = getHeight();
+    int mid = width / 2;
+    String str = "" + (++repaintNum);
+    int res = context1.makeCurrent();
+    if (res != GLContext.CONTEXT_NOT_CURRENT) {
+      clearAndDraw(context1.getGL().getGL2(),
+                   1, 0, 0,
+                   0, 0, mid, height, str);
+      context1.release();
+    }
+    
+    res = context2.makeCurrent();
+    if (res != GLContext.CONTEXT_NOT_CURRENT) {
+      clearAndDraw(context2.getGL().getGL2(),
+                   0, 0, 1,
+                   mid, 0, width - mid, height, str);
+      context2.release();
+    }
+
+    drawable.swapBuffers();
+  }
+
+  private void clearAndDraw(GL2 gl,
+                            float br,
+                            float bg,
+                            float bb,
+                            int x,
+                            int y,
+                            int width,
+                            int height,
+                            String str) {
+    gl.glViewport(x, y, width, height);
+    gl.glScissor(x, y, width, height);
+    gl.glEnable(GL.GL_SCISSOR_TEST);
+    gl.glClearColor(br, bg, bb, 1);
+    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+    float length = glut.glutStrokeLengthf(GLUT.STROKE_ROMAN, str);
+    gl.glMatrixMode(GL2ES1.GL_PROJECTION);
+    gl.glLoadIdentity();
+    glu.gluOrtho2D(x, x + width, y, y + height);
+    gl.glTranslatef(x + (width - length) / 2, y + height / 2, 0);
+    glut.glutStrokeString(GLUT.STROKE_ROMAN, str);
+  }
+
+  public static void main(String[] args) {
+    JFrame frame = new JFrame("Dual OpenGL Context Test");
+
+    GLProfile glp = GLProfile.getDefault(); // warm up ..
+
+    AWTGraphicsScreen screen = (AWTGraphicsScreen)AWTGraphicsScreen.createDefault();
+    AWTGraphicsConfiguration config = (AWTGraphicsConfiguration)
+         GraphicsConfigurationFactory.getFactory(AWTGraphicsDevice.class).chooseGraphicsConfiguration(new GLCapabilities(glp), null, screen);
+    final DualContext dc = new DualContext(config);
+
+    frame.getContentPane().add(dc, BorderLayout.CENTER);
+    JButton button = new JButton("Repaint");
+    button.addActionListener(new ActionListener() {
+        public void actionPerformed(ActionEvent e) {
+          dc.repaint();
+        }
+      });
+    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+    frame.getContentPane().add(button, BorderLayout.SOUTH);
+    frame.setSize(800, 400);
+    frame.setVisible(true);
+  }
+
+  private static GraphicsConfiguration unwrap(AWTGraphicsConfiguration config) {
+    if (config == null) {
+      return null;
+    }
+    return config.getGraphicsConfiguration();
+  }
+}