From 4b9a72c24bb97ed81c79c3931d4ffb5fa53d9978 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Sun, 4 Oct 2009 00:19:32 -0700
Subject: Add ReadBuffer Demos/ModuleTests; Incl. SurfaceUpdated Listener,
 ReadPixel to file, texture - direct or via attaching the drawable to another
 context as it's readbuffer

---
 src/demos/readbuffer/Main.java              | 207 ++++++++++++++++++++++++++++
 src/demos/readbuffer/ReadBuffer2File.java   |  74 ++++++++++
 src/demos/readbuffer/ReadBuffer2Screen.java | 176 +++++++++++++++++++++++
 src/demos/readbuffer/ReadBufferBase.java    |  95 +++++++++++++
 src/demos/readbuffer/ReadBufferUtil.java    | 109 +++++++++++++++
 src/demos/readbuffer/Surface2File.java      |  79 +++++++++++
 6 files changed, 740 insertions(+)
 create mode 100755 src/demos/readbuffer/Main.java
 create mode 100755 src/demos/readbuffer/ReadBuffer2File.java
 create mode 100755 src/demos/readbuffer/ReadBuffer2Screen.java
 create mode 100755 src/demos/readbuffer/ReadBufferBase.java
 create mode 100755 src/demos/readbuffer/ReadBufferUtil.java
 create mode 100755 src/demos/readbuffer/Surface2File.java

(limited to 'src/demos/readbuffer')

diff --git a/src/demos/readbuffer/Main.java b/src/demos/readbuffer/Main.java
new file mode 100755
index 0000000..ccc3988
--- /dev/null
+++ b/src/demos/readbuffer/Main.java
@@ -0,0 +1,207 @@
+package demos.readbuffer;
+
+import java.lang.reflect.*;
+import java.nio.*;
+import javax.media.opengl.*;
+import javax.media.nativewindow.*;
+import com.sun.javafx.newt.*;
+import com.sun.javafx.newt.opengl.*;
+
+public class Main implements WindowListener, MouseListener, SurfaceUpdatedListener {
+
+    public boolean quit = false;
+    public GLWindow window = null;
+
+    public void surfaceUpdated(Object updater, NativeWindow window, long when) {
+        if(null!=window) {
+            this.window.display();
+        }
+    }
+
+    public void windowResized(WindowEvent e) { }
+    public void windowMoved(WindowEvent e) { }
+    public void windowGainedFocus(WindowEvent e) { }
+    public void windowLostFocus(WindowEvent e) { }
+    public void windowDestroyNotify(WindowEvent e) {
+        quit = true;
+    }
+
+    public void mouseClicked(MouseEvent e) {
+        System.out.println("mouseevent: "+e);
+        switch(e.getClickCount()) {
+            case 1:
+                if(null!=window) {
+                    window.setFullscreen(!window.isFullscreen());
+                }
+                break;
+            default: 
+                quit=true;
+                break;
+        }
+    }
+    public void mouseEntered(MouseEvent e) {
+    }
+    public void mouseExited(MouseEvent e) {
+    }
+    public void mousePressed(MouseEvent e) {
+    }
+    public void mouseReleased(MouseEvent e) {
+    }
+    public void mouseMoved(MouseEvent e) {
+    }
+    public void mouseDragged(MouseEvent e) {
+    }
+    public void mouseWheelMoved(MouseEvent e) {
+    }
+
+    public GLWindow createOffscreen(GLCapabilities caps, int w, int h) {
+        GLCapabilities capsOffscreen = (GLCapabilities) caps.clone();
+        capsOffscreen.setOnscreen(false);
+        capsOffscreen.setPBuffer(true);
+        GLWindow windowOffscreen = GLWindow.create(capsOffscreen);
+        windowOffscreen.enablePerfLog(true);
+        windowOffscreen.setSize(w, h);
+        windowOffscreen.setVisible(true);
+        return windowOffscreen;
+    }
+
+    private void run(int typeNewt, boolean fullscreen, int typeTest, GLEventListener demo) {
+        int width = 800;
+        int height = 480;
+        System.out.println("readbuffer.Main.run() Test: "+typeTest);
+        try {
+            GLCapabilities caps = new GLCapabilities(null);
+
+            // Full init pbuffer window ..
+            GLWindow windowOffscreen = createOffscreen(caps, width, height);
+            // setField(demo, "glDebug", new Boolean(true));
+            // setField(demo, "glTrace", new Boolean(true));
+            if(!setField(demo, "window", windowOffscreen)) {
+                setField(demo, "glWindow", windowOffscreen);
+            }
+            windowOffscreen.addGLEventListener(demo);
+
+            if ( TEST_SURFACE2FILE < typeTest ) {
+                System.out.println("readbuffer.Main.run() Using a target onscreen window with read drawable attachment");
+                // Setup init onscreen window ..
+                Window nWindow = null;
+                if(0!=(typeNewt&USE_AWT)) {
+                    Display nDisplay = NewtFactory.createDisplay(NativeWindowFactory.TYPE_AWT, null); // local display
+                    Screen nScreen  = NewtFactory.createScreen(NativeWindowFactory.TYPE_AWT, nDisplay, 0); // screen 0
+                    nWindow = NewtFactory.createWindow(NativeWindowFactory.TYPE_AWT, nScreen, caps);
+                    window = GLWindow.create(nWindow);
+                } else {
+                    window = GLWindow.create(caps);
+                }
+
+                window.addWindowListener(this);
+                window.addMouseListener(this);
+
+                window.setSize(width, height);
+                window.setFullscreen(fullscreen);
+                window.setVisible(true);
+            }
+
+            GLDrawable readDrawable = windowOffscreen.getContext().getGLDrawable() ;
+
+            if ( TEST_SURFACE2FILE == typeTest ) {
+                Surface2File s2f = new Surface2File();
+                windowOffscreen.addSurfaceUpdatedListener(s2f);
+            } else if ( TEST_READBUFFER2FILE == typeTest ) {
+                ReadBuffer2File readDemo = new ReadBuffer2File( readDrawable ) ;
+                window.addGLEventListener(readDemo);
+            } else if ( TEST_READBUFFER2SCREEN == typeTest ) {
+                ReadBuffer2Screen readDemo = new ReadBuffer2Screen( readDrawable ) ;
+                window.addGLEventListener(readDemo);
+            }
+
+            if(null!=window) {
+                windowOffscreen.addSurfaceUpdatedListener(this);
+            }
+
+            System.out.println("+++++++++++++++++++++++++++");
+            System.out.println(windowOffscreen);
+            System.out.println("+++++++++++++++++++++++++++");
+
+            while ( !quit && windowOffscreen.getDuration() < 31000) {
+                // System.out.println("...............................");
+                windowOffscreen.display();
+            }
+
+            // Shut things down cooperatively
+            window.destroy();
+            windowOffscreen.destroy();
+            window.getFactory().shutdown();
+            System.out.println("readbuffer.Main shut down cleanly.");
+        } catch (GLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static int USE_NEWT      = 0;
+    public static int USE_AWT       = 1 << 0;
+
+    public static int TEST_SURFACE2FILE      = 0;
+    public static int TEST_READBUFFER2FILE   = 1;
+    public static int TEST_READBUFFER2SCREEN = 2;
+
+    public static void main(String[] args) {
+        boolean fullscreen = false;
+        int typeNewt = USE_NEWT ;
+        int typeTest = TEST_SURFACE2FILE;
+        int i=0;
+        while(i<args.length-1) {
+            if(args[i].equals("-awt")) {
+                typeNewt |= USE_AWT; 
+            } else if(args[i].equals("-fs")) {
+                fullscreen = true;
+            } else if(args[i].equals("-test")) {
+                i++;
+                typeTest = str2int(args[i], typeTest);
+            }
+            i++;
+        }
+        String demoClassName = args[i];
+        Object demoObject = null;
+
+        try {
+            Class demoClazz = Class.forName(demoClassName);
+            demoObject = demoClazz.newInstance();
+        } catch (Throwable t) {
+            t.printStackTrace();
+            throw new RuntimeException("Error while instantiating demo: "+demoClassName);
+        }
+        if( !(demoObject instanceof GLEventListener) ) {
+            throw new RuntimeException("Not a GLEventListener: "+demoClassName);
+        }
+        GLEventListener demo = (GLEventListener) demoObject;
+
+        new Main().run(typeNewt, fullscreen, typeTest, demo);
+        System.exit(0);
+    }
+
+    public static int str2int(String str, int def) {
+        try {
+            return Integer.parseInt(str);
+        } catch (Exception ex) { ex.printStackTrace(); }
+        return def;
+    }
+
+    public static boolean setField(Object instance, String fieldName, Object value) {
+        try {
+            Field f = instance.getClass().getField(fieldName);
+            if(f.getType().isInstance(value)) {
+                f.set(instance, value);
+                return true;
+            } else {
+                System.out.println(instance.getClass()+" '"+fieldName+"' field not assignable with "+value.getClass()+", it's a: "+f.getType());
+            }
+        } catch (NoSuchFieldException nsfe) {
+            System.out.println(instance.getClass()+" has no '"+fieldName+"' field");
+        } catch (Throwable t) {
+            t.printStackTrace();
+        }
+        return false;
+    }
+
+}
diff --git a/src/demos/readbuffer/ReadBuffer2File.java b/src/demos/readbuffer/ReadBuffer2File.java
new file mode 100755
index 0000000..9b96d9b
--- /dev/null
+++ b/src/demos/readbuffer/ReadBuffer2File.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2008 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.
+ * 
+ */
+
+package demos.readbuffer;
+
+import java.nio.*;
+import javax.media.opengl.*;
+
+import com.sun.opengl.util.texture.TextureData;
+import com.sun.opengl.util.texture.spi.awt.IIOTextureWriter;
+import java.io.File;
+import java.io.IOException;
+
+import javax.media.nativewindow.*;
+
+public class ReadBuffer2File extends ReadBufferBase {
+
+    public ReadBuffer2File (GLDrawable externalRead) {
+        super(externalRead);
+    }
+
+    public void dispose(GLAutoDrawable drawable) {
+        super.dispose(drawable);
+    }
+
+    IIOTextureWriter textureWriter = new IIOTextureWriter();
+    int shotNum=0;
+
+    void copyTextureData2File() {
+      if(!readBufferUtil.isValid()) return;
+
+      try {
+        textureWriter.write(new File("/tmp/shot/shot-"+shotNum+".jpg"), readBufferUtil.getTextureData());
+        shotNum++;
+      } catch (IOException ioe) { ioe.printStackTrace(); }
+      readBufferUtil.rewindPixelBuffer();
+    }
+
+    public void display(GLAutoDrawable drawable) {
+        super.display(drawable);
+        copyTextureData2File();
+    }
+}
+
diff --git a/src/demos/readbuffer/ReadBuffer2Screen.java b/src/demos/readbuffer/ReadBuffer2Screen.java
new file mode 100755
index 0000000..48db635
--- /dev/null
+++ b/src/demos/readbuffer/ReadBuffer2Screen.java
@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2008 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.
+ * 
+ */
+
+package demos.readbuffer;
+
+import java.nio.*;
+import javax.media.opengl.*;
+import javax.media.opengl.fixedfunc.*;
+
+import com.sun.opengl.util.*;
+import com.sun.opengl.util.glsl.fixedfunc.*;
+
+import javax.media.opengl.fixedfunc.GLPointerFunc;
+import com.sun.opengl.util.texture.Texture;
+import com.sun.opengl.util.texture.TextureData;
+import com.sun.opengl.util.texture.TextureCoords;
+import com.sun.opengl.util.GLArrayDataServer;
+import com.sun.opengl.util.BufferUtil;
+
+public class ReadBuffer2Screen extends ReadBufferBase {
+    PMVMatrix pmvMatrix;
+    GLArrayDataServer readTextureVertices = null;
+    GLArrayDataServer readTextureCoords = null;
+
+    public ReadBuffer2Screen (GLDrawable externalRead) {
+        super(externalRead);
+    }
+
+    public void init(GLAutoDrawable drawable) {
+        super.init(drawable);
+
+        GL gl = drawable.getGL();
+
+        pmvMatrix = new PMVMatrix();
+
+        float f_edge = 1f;
+        if(null==readTextureVertices) {
+            readTextureVertices = GLArrayDataServer.createFixed(gl, GLPointerFunc.GL_VERTEX_ARRAY, "mgl_Vertex", 
+                                                                2, GL.GL_FLOAT, true, 4, GL.GL_STATIC_DRAW);
+            {
+                FloatBuffer vb = (FloatBuffer)readTextureVertices.getBuffer();
+                vb.put(-f_edge); vb.put(-f_edge);
+                vb.put( f_edge); vb.put(-f_edge);
+                vb.put(-f_edge); vb.put( f_edge);
+                vb.put( f_edge); vb.put( f_edge);
+            }
+            readTextureVertices.seal(gl, true);
+        }
+
+        // Clear background to gray
+        gl.glClearColor(0.5f, 0.5f, 0.5f, 0.4f);
+    }
+
+    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
+        super.reshape(drawable, x, y, width, height);
+
+        GL gl = drawable.getGL();
+
+        gl.glViewport(0, 0, width, height);
+
+        if(gl instanceof GLLightingFunc) {
+            ((GLLightingFunc)gl).glShadeModel(GLLightingFunc.GL_SMOOTH);
+        }
+
+        GLMatrixFunc glM;
+        if(gl instanceof GLMatrixFunc) {
+            glM = (GLMatrixFunc)gl;
+        } else {
+            throw new GLException("ES2 currently unhandled .. ");
+        }
+
+        // Identity ..
+        pmvMatrix.glMatrixMode(pmvMatrix.GL_MODELVIEW);
+        pmvMatrix.glLoadIdentity();
+        pmvMatrix.glTranslatef(0, 0, -2.5f);
+        if(null!=glM) {
+            glM.glMatrixMode(pmvMatrix.GL_MODELVIEW);
+            glM.glLoadMatrixf(pmvMatrix.glGetMvMatrixf());
+        }
+
+        // Set location in front of camera
+        pmvMatrix.glMatrixMode(pmvMatrix.GL_PROJECTION);
+        pmvMatrix.glLoadIdentity();
+        pmvMatrix.gluPerspective(45.0f, (float)width / (float)height, 1.0f, 100.0f);
+        if(null!=glM) {
+            glM.glMatrixMode(pmvMatrix.GL_PROJECTION);
+            glM.glLoadMatrixf(pmvMatrix.glGetPMatrixf());
+        }
+    }
+
+    public void dispose(GLAutoDrawable drawable) {
+        super.dispose(drawable);
+    }
+
+    void renderOffscreenTexture(GL gl) {
+      if(!readBufferUtil.isValid()) return;
+
+      updateTextureCoords(gl, false);
+
+      // Now draw one quad with the texture
+      readBufferUtil.getTexture().enable();
+      readBufferUtil.getTexture().bind();
+      if(gl.isGL2ES1()) {
+          // gl.getGL2ES1().glTexEnvi(GL2ES1.GL_TEXTURE_ENV, GL2ES1.GL_TEXTURE_ENV_MODE, GL2ES1.GL_REPLACE);
+          gl.getGL2ES1().glTexEnvi(GL2ES1.GL_TEXTURE_ENV, GL2ES1.GL_TEXTURE_ENV_MODE, GL2ES1.GL_MODULATE);
+      }
+
+      readTextureVertices.enableBuffer(gl, true);
+      if(null!=readTextureCoords) {
+          readTextureCoords.enableBuffer(gl, true);
+      }
+      gl.glDrawArrays(GL.GL_TRIANGLE_STRIP, 0, readTextureVertices.getElementNumber());
+
+      readBufferUtil.getTexture().disable();
+    }
+
+    void updateTextureCoords(GL gl, boolean force) {
+        if(force || null==readTextureCoords) {
+            readTextureCoords = GLArrayDataServer.createFixed(gl, GLPointerFunc.GL_TEXTURE_COORD_ARRAY, "mgl_MultiTexCoord0", 
+                                                              2, GL.GL_FLOAT, true, 4, GL.GL_STATIC_DRAW);
+            {
+                TextureCoords coords = readBufferUtil.getTexture().getImageTexCoords();
+                FloatBuffer cb = (FloatBuffer)readTextureCoords.getBuffer();
+                cb.put(coords.left());  cb.put(coords.bottom());
+                cb.put(coords.right()); cb.put(coords.bottom());
+                cb.put(coords.left());  cb.put(coords.top());
+                cb.put(coords.right()); cb.put(coords.top());
+            }
+            readTextureCoords.seal(gl, true);
+        }
+    }
+
+    public void display(GLAutoDrawable drawable) {
+        super.display(drawable);
+
+        GL gl = drawable.getGL();
+
+        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT);
+        if(gl instanceof GLLightingFunc) {
+            ((GLLightingFunc)gl).glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
+        }
+
+        renderOffscreenTexture(gl);
+    }
+}
+
diff --git a/src/demos/readbuffer/ReadBufferBase.java b/src/demos/readbuffer/ReadBufferBase.java
new file mode 100755
index 0000000..77ffd96
--- /dev/null
+++ b/src/demos/readbuffer/ReadBufferBase.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2008 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.
+ * 
+ */
+
+package demos.readbuffer;
+
+import java.nio.*;
+import javax.media.opengl.*;
+
+import com.sun.opengl.util.texture.Texture;
+import com.sun.opengl.util.texture.TextureData;
+import com.sun.opengl.util.BufferUtil;
+
+
+public class ReadBufferBase implements GLEventListener {
+    public boolean glDebug = false ;
+    public boolean glTrace = false ;
+
+    protected GLDrawable externalRead;
+
+    ReadBufferUtil readBufferUtil = new ReadBufferUtil();
+
+    public ReadBufferBase (GLDrawable externalRead) {
+        this.externalRead = externalRead ;
+    }
+
+    public void init(GLAutoDrawable drawable) {
+        GL _gl = drawable.getGL();
+
+        _gl.glGetError(); // flush error ..
+
+        if(glDebug) {
+            try {
+                _gl = _gl.getContext().setGL( GLPipelineFactory.create("javax.media.opengl.Debug", null, _gl, null) );
+            } catch (Exception e) {e.printStackTrace();} 
+        }
+
+        if(glTrace) {
+            try {
+                _gl = _gl.getContext().setGL( GLPipelineFactory.create("javax.media.opengl.Trace", null, _gl, new Object[] { System.err } ) );
+            } catch (Exception e) {e.printStackTrace();} 
+        }
+
+        System.out.println(_gl);
+
+        _gl.getContext().setGLDrawableRead(externalRead);
+        if(_gl.isGL2GL3()) {
+            _gl.getGL2GL3().glReadBuffer(GL2GL3.GL_FRONT);
+        }
+    }
+
+    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
+    }
+
+    public void dispose(GLAutoDrawable drawable) {
+        readBufferUtil.dispose();
+    }
+
+    public void display(GLAutoDrawable drawable) {
+        GL gl = drawable.getGL();
+
+        readBufferUtil.fetchOffscreenTexture(drawable, gl);
+    }
+
+}
+
diff --git a/src/demos/readbuffer/ReadBufferUtil.java b/src/demos/readbuffer/ReadBufferUtil.java
new file mode 100755
index 0000000..96f4b06
--- /dev/null
+++ b/src/demos/readbuffer/ReadBufferUtil.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2008 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.
+ * 
+ */
+
+package demos.readbuffer;
+
+import java.nio.*;
+import javax.media.opengl.*;
+
+import com.sun.opengl.util.texture.Texture;
+import com.sun.opengl.util.texture.TextureData;
+import com.sun.opengl.util.BufferUtil;
+
+public class ReadBufferUtil {
+    protected int readPixelSizeLast = 0;
+    protected Buffer readPixelBuffer = null;
+    protected TextureData readTextureData = null;
+    protected Texture readTexture = new Texture(GL.GL_TEXTURE_2D);
+
+    public Buffer getPixelBuffer() { return readPixelBuffer; }
+    public void rewindPixelBuffer() { readPixelBuffer.rewind(); }
+
+    public TextureData getTextureData() { return readTextureData; }
+    public Texture getTexture() { return readTexture; }
+
+    public boolean isValid() {
+      return null!=readTexture && null!=readTextureData && null!=readPixelBuffer ;
+    }
+
+    public void fetchOffscreenTexture(GLDrawable drawable, GL gl) {
+        int readPixelSize = drawable.getWidth() * drawable.getHeight() * 3 ; // RGB
+        boolean newData = false;
+        if(readPixelSize>readPixelSizeLast) {
+            readPixelBuffer = BufferUtil.newGLBuffer(gl.GL_UNSIGNED_BYTE, readPixelSize);
+            readPixelSizeLast = readPixelSize ;
+            try {
+                readTextureData = new TextureData(
+                           gl.GL_RGBA,
+                           drawable.getWidth(), drawable.getHeight(),
+                           0, 
+                           gl.GL_RGB,
+                           gl.GL_UNSIGNED_BYTE,
+                           false, false, 
+                           false /* flip */,
+                           readPixelBuffer,
+                           null /* Flusher */);
+                newData = true;
+            } catch (Exception e) {
+                e.printStackTrace();
+                readTextureData = null;
+                readPixelBuffer = null;
+                readPixelSizeLast = 0;
+            }
+        }
+        if(null!=readPixelBuffer) {
+            readPixelBuffer.clear();
+            gl.glReadPixels(0, 0, drawable.getWidth(), drawable.getHeight(), GL.GL_RGB, GL.GL_UNSIGNED_BYTE, readPixelBuffer);
+            readPixelBuffer.rewind();
+            if(newData) {
+                readTexture.updateImage(readTextureData);
+            } else {
+                readTexture.updateSubImage(readTextureData, 0, 
+                                           0, 0, // src offset
+                                           0, 0, // dst offset
+                                           drawable.getWidth(), drawable.getHeight());
+            }
+            readPixelBuffer.rewind();
+        }
+    }
+
+    public void dispose() {
+        readTexture.dispose();
+        readTextureData = null;
+        readPixelBuffer.clear();
+        readPixelBuffer = null;
+        readPixelSizeLast = 0;
+    }
+
+}
+
diff --git a/src/demos/readbuffer/Surface2File.java b/src/demos/readbuffer/Surface2File.java
new file mode 100755
index 0000000..12a5256
--- /dev/null
+++ b/src/demos/readbuffer/Surface2File.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2008 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.
+ * 
+ */
+
+package demos.readbuffer;
+
+import java.nio.*;
+import javax.media.opengl.*;
+
+import com.sun.opengl.util.texture.TextureData;
+import com.sun.opengl.util.BufferUtil;
+
+import com.sun.opengl.util.texture.spi.awt.IIOTextureWriter;
+import java.io.File;
+import java.io.IOException;
+
+import javax.media.nativewindow.*;
+
+public class Surface2File implements SurfaceUpdatedListener {
+
+    ReadBufferUtil readBufferUtil = new ReadBufferUtil();
+    IIOTextureWriter textureWriter = new IIOTextureWriter();
+    int shotNum=0;
+
+    public void dispose() {
+        readBufferUtil.dispose();
+    }
+
+    public void surfaceUpdated(Object updater, NativeWindow window, long when) {
+        if(updater instanceof GLDrawable) {
+            GLDrawable drawable = (GLDrawable) updater;
+            GLContext ctx = GLContext.getCurrent();
+            if(null!=ctx && ctx.getGLDrawable()==drawable) {
+                readBufferUtil.fetchOffscreenTexture(drawable, ctx.getGL());
+                surface2File("/tmp/shot/shot");
+            }
+        }
+    }
+
+    public void surface2File(String basename) {
+      if(!readBufferUtil.isValid()) return;
+
+      try {
+        textureWriter.write(new File(basename+"-"+shotNum+".jpg"), readBufferUtil.getTextureData());
+        shotNum++;
+      } catch (IOException ioe) { ioe.printStackTrace(); }
+      readBufferUtil.rewindPixelBuffer();
+    }
+}
+
-- 
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