Add Qt3 development HEAD version

8 files changed, 700 insertions, 0 deletions

diff --git a/examples/opengl/overlay/README b/examples/opengl/overlay/README
new file mode 100644
index 0000000..f08e539
--- /dev/null
+++ b/examples/opengl/overlay/README
@@ -0,0 +1,9 @@
+
+The overlay example
+
+This example program shows how to use OpenGL overlays with the Qt OpenGL
+Extension. It contains a QGLWidget with a relatively expensive
+redrawing operation, and rubber-band drawing in the overlay plane.
+Using the overlay has the advantage that the rubber-band may be drawn
+and erased without damaging the image in the main plane, so costly
+redraws are avoided.
diff --git a/examples/opengl/overlay/globjwin.cpp b/examples/opengl/overlay/globjwin.cpp
new file mode 100644
index 0000000..8879b8d
--- /dev/null
+++ b/examples/opengl/overlay/globjwin.cpp
@@ -0,0 +1,57 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include <qlayout.h>
+#include <qframe.h>
+#include <qmenubar.h>
+#include <qpopupmenu.h>
+#include <qapplication.h>
+#include <qmessagebox.h>
+#include "globjwin.h"
+#include "glteapots.h"
+
+
+GLObjectWindow::GLObjectWindow( QWidget* parent, const char* name )
+    : QWidget( parent, name )
+{
+    // Create a menu
+    QPopupMenu *file = new QPopupMenu( this );
+    file->insertItem( "Exit",  qApp, SLOT(quit()), CTRL+Key_Q );
+
+    // Create a menu bar
+    QMenuBar *m = new QMenuBar( this );
+    m->setSeparator( QMenuBar::InWindowsStyle );
+    m->insertItem("&File", file );
+
+    // Create a nice frame to put around the OpenGL widget
+    QFrame* f = new QFrame( this, "frame" );
+    f->setFrameStyle( QFrame::Sunken | QFrame::Panel );
+    f->setLineWidth( 2 );
+
+    // Create our OpenGL widget.
+    GLTeapots* c = new GLTeapots( f, "glteapots" );
+
+    // Check if we obtained an overlay
+    if ( !c->format().hasOverlay() ) {
+	QMessageBox::warning( 0, qApp->argv()[0], 
+			      "Failed to get an OpenGL overlay",
+			      "OK" );
+    }
+
+    // Now that we have all the widgets, put them into a nice layout
+
+    // Put the GL widget inside the frame
+    QHBoxLayout* flayout = new QHBoxLayout( f, 2, 2, "flayout");
+    flayout->addWidget( c, 1 );
+
+    // Top level layout
+    QVBoxLayout* hlayout = new QVBoxLayout( this, 20, 20, "hlayout");
+    hlayout->setMenuBar( m );
+    hlayout->addWidget( f, 1 );
+}
diff --git a/examples/opengl/overlay/globjwin.h b/examples/opengl/overlay/globjwin.h
new file mode 100644
index 0000000..46de98e
--- /dev/null
+++ b/examples/opengl/overlay/globjwin.h
@@ -0,0 +1,33 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+/****************************************************************************
+**
+** The GLObjectWindow contains a GLBox and three sliders connected to
+** the GLBox's rotation slots.
+**
+****************************************************************************/
+
+#ifndef GLOBJWIN_H
+#define GLOBJWIN_H
+
+#include <qwidget.h>
+
+
+class GLObjectWindow : public QWidget
+{
+    Q_OBJECT
+public:
+    GLObjectWindow( QWidget* parent = 0, const char* name = 0 );
+
+
+};
+
+
+#endif // GLOBJWIN_H
diff --git a/examples/opengl/overlay/glteapots.cpp b/examples/opengl/overlay/glteapots.cpp
new file mode 100644
index 0000000..f3aaec1
--- /dev/null
+++ b/examples/opengl/overlay/glteapots.cpp
@@ -0,0 +1,457 @@
+/****************************************************************************
+**
+** Implementation of GLTeapots
+** This is a QGLWidget displaying a group of teapots and a rubber-band
+** in an overlay plane
+**
+** The OpenGL code in this example is mostly borrowed from the "teapots"
+** example program in the "OpenGL Programming Guide", by Jackie Neider,
+** Tom Davis, and Mason Woo, Addison Wesley 1993.
+** It can be obtained from ftp.sgi.com and contains the following copyright
+** notice:
+
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED 
+ * Permission to use, copy, modify, and distribute this software for 
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that 
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission. 
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ * 
+ * US Government Users Restricted Rights 
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
+
+****************************************************************************/
+
+#include "glteapots.h"
+#include <qapplication.h>
+
+#if defined(Q_CC_MSVC)
+#pragma warning(disable:4305) // init: truncation from const double to float
+#endif
+
+/*!
+  Create a GLTeapots widget.
+
+  Specifies the following frame buffer requirements to the QGLWidget
+  constructor:
+  <ul>
+  <li> HasOverlay - we want an overlay context to draw the rubber-band in
+  <li> SingleBuffer - makes the drawing process of the teapots visible
+  </ul>
+*/
+
+
+GLTeapots::GLTeapots( QWidget* parent, const char* name )
+    : QGLWidget( QGLFormat( QGL::SingleBuffer | QGL::HasOverlay ),
+		 parent, name )
+{
+    teapotList = 0;
+    rubberOn = FALSE;
+}
+
+/*!
+  Release allocated resources
+*/
+
+GLTeapots::~GLTeapots()
+{
+    makeCurrent();
+    glDeleteLists( teapotList, 1 );
+}
+
+
+/*!
+  Do the main plane painting: a set of teapots.
+*/
+
+void GLTeapots::paintGL()
+{
+    QApplication::setOverrideCursor( waitCursor ); // Since it takes some time
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    renderTeapot( 2.0, 17.0, 0.0215, 0.1745, 0.0215, 
+		  0.07568, 0.61424, 0.07568,
+		  0.633, 0.727811, 0.633, 0.6 );
+    renderTeapot( 2.0, 14.0, 0.135, 0.2225, 0.1575,
+		  0.54, 0.89, 0.63, 0.316228,
+		  0.316228, 0.316228, 0.1 );
+    renderTeapot( 2.0, 11.0, 0.05375, 0.05, 0.06625,
+		  0.18275, 0.17, 0.22525,
+		  0.332741, 0.328634, 0.346435, 0.3 );
+    renderTeapot( 2.0, 8.0, 0.25, 0.20725, 0.20725,
+		  1, 0.829, 0.829, 0.296648,
+		  0.296648, 0.296648, 0.088 );
+    renderTeapot( 2.0, 5.0, 0.1745, 0.01175, 0.01175,
+		  0.61424, 0.04136, 0.04136,
+		  0.727811, 0.626959, 0.626959, 0.6);
+    renderTeapot( 2.0, 2.0, 0.1, 0.18725, 0.1745,
+		  0.396, 0.74151, 0.69102,
+		  0.297254, 0.30829, 0.306678, 0.1 );
+
+    renderTeapot( 6.0, 17.0, 0.329412, 0.223529, 0.027451,
+		  0.780392, 0.568627, 0.113725,
+		  0.992157, 0.941176, 0.807843, 0.21794872 );
+    renderTeapot( 6.0, 14.0, 0.2125, 0.1275, 0.054,
+		  0.714, 0.4284, 0.18144,
+		  0.393548, 0.271906, 0.166721, 0.2 );
+    renderTeapot( 6.0, 11.0, 0.25, 0.25, 0.25, 
+		  0.4, 0.4, 0.4,
+		  0.774597, 0.774597, 0.774597, 0.6 );
+    renderTeapot( 6.0, 8.0, 0.19125, 0.0735, 0.0225,
+		  0.7038, 0.27048, 0.0828,
+		  0.256777, 0.137622, 0.086014, 0.1 );
+    renderTeapot( 6.0, 5.0, 0.24725, 0.1995, 0.0745,
+		  0.75164, 0.60648, 0.22648,
+		  0.628281, 0.555802, 0.366065, 0.4 );
+    renderTeapot( 6.0, 2.0, 0.19225, 0.19225, 0.19225,
+		  0.50754, 0.50754, 0.50754,
+		  0.508273, 0.508273, 0.508273, 0.4 );
+
+    renderTeapot( 10.0, 17.0, 0.0, 0.0, 0.0,
+		  0.01, 0.01, 0.01,
+		  0.50, 0.50, 0.50, .25 );
+    renderTeapot( 10.0, 14.0, 0.0, 0.1, 0.06,
+		  0.0, 0.50980392, 0.50980392,
+		  0.50196078, 0.50196078, 0.50196078, .25 );
+    renderTeapot( 10.0, 11.0, 0.0, 0.0, 0.0, 
+		  0.1, 0.35, 0.1,
+		  0.45, 0.55, 0.45, .25 );
+    renderTeapot( 10.0, 8.0, 0.0, 0.0, 0.0,
+		  0.5, 0.0, 0.0,
+		  0.7, 0.6, 0.6, .25 );
+    renderTeapot( 10.0, 5.0, 0.0, 0.0, 0.0,
+		  0.55, 0.55, 0.55,
+		  0.70, 0.70, 0.70, .25 );
+    renderTeapot( 10.0, 2.0, 0.0, 0.0, 0.0,
+		  0.5, 0.5, 0.0,
+		  0.60, 0.60, 0.50, .25 );
+
+    renderTeapot( 14.0, 17.0, 0.02, 0.02, 0.02,
+		  0.01, 0.01, 0.01,
+		  0.4, 0.4, 0.4, .078125 );
+    renderTeapot( 14.0, 14.0, 0.0, 0.05, 0.05,
+		  0.4, 0.5, 0.5,
+		  0.04, 0.7, 0.7, .078125 );
+    renderTeapot( 14.0, 11.0, 0.0, 0.05, 0.0,
+		  0.4, 0.5, 0.4,
+		  0.04, 0.7, 0.04, .078125 );
+    renderTeapot( 14.0, 8.0, 0.05, 0.0, 0.0,
+		  0.5, 0.4, 0.4,
+		  0.7, 0.04, 0.04, .078125 );
+    renderTeapot( 14.0, 5.0, 0.05, 0.05, 0.05,
+		  0.5, 0.5, 0.5,
+		  0.7, 0.7, 0.7, .078125 );
+    renderTeapot( 14.0, 2.0, 0.05, 0.05, 0.0,
+		  0.5, 0.5, 0.4, 
+		  0.7, 0.7, 0.04, .078125 );
+
+    // May add a glFinish() here to make sure the GL rendering has finished
+    // before the mouse cursor is reset from "waiting" to normal.
+    QApplication::restoreOverrideCursor();
+}
+
+
+/*!
+  Set up the OpenGL rendering state of the main plane
+*/
+
+void GLTeapots::initializeGL()
+{
+    GLfloat ambient[] = { 0.0, 0.0, 0.0, 1.0 };
+    GLfloat diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
+    GLfloat position[] = { 0.0, 3.0, 3.0, 0.0 };
+    
+    GLfloat lmodel_ambient[] = { 0.2, 0.2, 0.2, 1.0 };
+    GLfloat local_view[] = { 0.0 };
+
+    glLightfv( GL_LIGHT0, GL_AMBIENT, ambient );
+    glLightfv( GL_LIGHT0, GL_DIFFUSE, diffuse );
+    glLightfv( GL_LIGHT0, GL_POSITION, position );
+    glLightModelfv( GL_LIGHT_MODEL_AMBIENT, lmodel_ambient );
+    glLightModelfv( GL_LIGHT_MODEL_LOCAL_VIEWER, local_view );
+
+    glFrontFace( GL_CW );
+    glEnable( GL_LIGHTING );
+    glEnable( GL_LIGHT0 );
+    glEnable( GL_AUTO_NORMAL );
+    glEnable( GL_NORMALIZE );
+    glEnable( GL_DEPTH_TEST );
+    glDepthFunc( GL_LESS );
+}
+
+
+
+/*!
+  Set up the main plane's view port, matrix mode, etc. suitably for
+  viewing the teapots.
+*/
+
+void GLTeapots::resizeGL( int w, int h )
+{
+    glViewport(0, 0, w, h);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    if ( w <= h )
+	glOrtho( 0.0, 20.0, 0.0, 20.0*(GLfloat)h/(GLfloat)w, -10.0, 10.0 );
+    else
+	glOrtho( 0.0, 20.0*(GLfloat)w/(GLfloat)h, 0.0, 20.0, -10.0, 10.0 );
+    glMatrixMode(GL_MODELVIEW);
+}
+
+
+/*!
+  Set up the OpenGL rendering state of the overlay plane
+*/
+
+void GLTeapots::initializeOverlayGL()
+{
+    glLineWidth( 2 );
+    glLineStipple( 3, 0xAAAA );
+    glEnable( GL_LINE_STIPPLE );
+}
+
+
+/*!
+  Do the overlay plane painting: a rubber-band (if the user has
+  dragged out one).
+
+*/
+
+void GLTeapots::paintOverlayGL()
+{
+    glClear( GL_COLOR_BUFFER_BIT );
+    if ( rubberOn ) {
+	qglColor( QColor( 255, 255, 0 ) );
+	glBegin( GL_LINE_LOOP );
+	glVertex2i( rubberP1.x(), rubberP1.y() );
+	glVertex2i( rubberP2.x(), rubberP1.y() );
+	glVertex2i( rubberP2.x(), rubberP2.y() );
+	glVertex2i( rubberP1.x(), rubberP2.y() );
+	glEnd();
+    }
+}
+
+
+/*!
+  Set up the overlay plane's view port, matrix mode, etc. suitably for
+  viewing the rubber-band.
+*/
+
+void GLTeapots::resizeOverlayGL( int w, int h )
+{
+    glViewport( 0, 0, w, h );
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluOrtho2D( 0, w, h, 0 );
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+}
+
+
+/*!
+  User presses a mouse button: start pulling out a rubber-band rectangle
+*/
+
+// We do a simple rubber-band drawing here; erasing the whole overlay
+// plane for each repaint. For less flickering of the rubber-band
+// itself, we could remember the coordinates of the last rectangle
+// drawn, and then erase only that by painting it again with
+// transparent color.
+
+void GLTeapots::mousePressEvent( QMouseEvent* e )
+{
+    rubberP1 = e->pos();
+    rubberP2 = rubberP1;
+    rubberOn = TRUE;
+}
+
+/*!
+  User drags the mouse: Update the rubber-band coordinates and repaint
+  the overlay.
+*/
+
+void GLTeapots::mouseMoveEvent( QMouseEvent* e )
+{
+    if ( rubberOn ) {
+	rubberP2 = e->pos();
+	updateOverlayGL();
+    }
+}
+
+/*!
+  User releases the mouse button: remove the rubber-band.
+*/
+
+void GLTeapots::mouseReleaseEvent( QMouseEvent* )
+{
+    if ( rubberOn ) {
+	rubberOn = FALSE;
+	updateOverlayGL();
+    }
+}
+
+
+/*!
+  Renders a teapot with the given material properties
+*/
+
+void GLTeapots::renderTeapot( GLfloat x, GLfloat y, GLfloat ambr,
+			  GLfloat ambg, GLfloat ambb, GLfloat difr,
+			  GLfloat difg, GLfloat difb, 
+			  GLfloat specr, GLfloat specg, 
+			  GLfloat specb, GLfloat shine )
+{
+    float mat[4];
+
+    glPushMatrix();
+    glTranslatef (x, y, 0.0);
+    mat[0] = ambr; mat[1] = ambg; mat[2] = ambb; mat[3] = 1.0;	
+    glMaterialfv (GL_FRONT, GL_AMBIENT, mat);
+    mat[0] = difr; mat[1] = difg; mat[2] = difb;	
+    glMaterialfv (GL_FRONT, GL_DIFFUSE, mat);
+    mat[0] = specr; mat[1] = specg; mat[2] = specb;
+    glMaterialfv (GL_FRONT, GL_SPECULAR, mat);
+    glMaterialf (GL_FRONT, GL_SHININESS, shine*128.0);
+    teapot();
+    glPopMatrix();
+}
+
+
+/*!
+  Draw a classic OpenGL teapot
+*/
+
+void GLTeapots::teapot()
+{
+    static long patchdata[][16] = {
+	{102,103,104,105,4,5,6,7,8,9,10,11,12,13,14,15},
+	{12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27},
+	{24,25,26,27,29,30,31,32,33,34,35,36,37,38,39,40},
+	{96,96,96,96,97,98,99,100,101,101,101,101,0,1,2,3,},
+	{0,1,2,3,106,107,108,109,110,111,112,113,114,115,116,117},
+	{118,118,118,118,124,122,119,121,123,126,125,120,40,39,38,37},
+	{41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56},
+	{53,54,55,56,57,58,59,60,61,62,63,64,28,65,66,67},
+	{68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83},
+	{80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95}
+    };
+
+    static float cpdata[][3] = {
+	{0.2,0,2.7},{0.2,-0.112,2.7},{0.112,-0.2,2.7},{0,-0.2,2.7},
+	{1.3375,0,2.53125},{1.3375,-0.749,2.53125},{0.749,-1.3375,2.53125},
+	{0,-1.3375,2.53125},{1.4375,0,2.53125},{1.4375,-0.805,2.53125},
+	{0.805,-1.4375,2.53125},{0,-1.4375,2.53125},{1.5,0,2.4},
+	{1.5,-0.84,2.4},{0.84,-1.5,2.4},{0,-1.5,2.4},{1.75,0,1.875},
+	{1.75,-0.98,1.875},{0.98,-1.75,1.875},{0,-1.75,1.875},{2,0,1.35},
+	{2,-1.12,1.35},{1.12,-2,1.35},{0,-2,1.35},{2,0,0.9},{2,-1.12,0.9},
+	{1.12,-2,0.9},{0,-2,0.9},{-2,0,0.9},{2,0,0.45},{2,-1.12,0.45},
+	{1.12,-2,0.45},{0,-2,0.45},{1.5,0,0.225},{1.5,-0.84,0.225},
+	{0.84,-1.5,0.225},{0,-1.5,0.225},{1.5,0,0.15},{1.5,-0.84,0.15},
+	{0.84,-1.5,0.15},{0,-1.5,0.15},{-1.6,0,2.025},{-1.6,-0.3,2.025},
+	{-1.5,-0.3,2.25},{-1.5,0,2.25},{-2.3,0,2.025},{-2.3,-0.3,2.025},
+	{-2.5,-0.3,2.25},{-2.5,0,2.25},{-2.7,0,2.025},{-2.7,-0.3,2.025},
+	{-3,-0.3,2.25},{-3,0,2.25},{-2.7,0,1.8},{-2.7,-0.3,1.8},{-3,-0.3,1.8},
+	{-3,0,1.8},{-2.7,0,1.575},{-2.7,-0.3,1.575},{-3,-0.3,1.35},{-3,0,1.35},
+	{-2.5,0,1.125},{-2.5,-0.3,1.125},{-2.65,-0.3,0.9375},{-2.65,0,0.9375},
+	{-2,-0.3,0.9},{-1.9,-0.3,0.6},{-1.9,0,0.6},{1.7,0,1.425},
+	{1.7,-0.66,1.425},{1.7,-0.66,0.6},{1.7,0,0.6},{2.6,0,1.425},
+	{2.6,-0.66,1.425},{3.1,-0.66,0.825},{3.1,0,0.825},{2.3,0,2.1},
+	{2.3,-0.25,2.1},{2.4,-0.25,2.025},{2.4,0,2.025},{2.7,0,2.4},
+	{2.7,-0.25,2.4},{3.3,-0.25,2.4},{3.3,0,2.4},{2.8,0,2.475},
+	{2.8,-0.25,2.475},{3.525,-0.25,2.49375},{3.525,0,2.49375},
+	{2.9,0,2.475},{2.9,-0.15,2.475},{3.45,-0.15,2.5125},{3.45,0,2.5125},
+	{2.8,0,2.4},{2.8,-0.15,2.4},{3.2,-0.15,2.4},{3.2,0,2.4},{0,0,3.15},
+	{0.8,0,3.15},{0.8,-0.45,3.15},{0.45,-0.8,3.15},{0,-0.8,3.15},
+	{0,0,2.85},{1.4,0,2.4},{1.4,-0.784,2.4},{0.784,-1.4,2.4},{0,-1.4,2.4},
+	{0.4,0,2.55},{0.4,-0.224,2.55},{0.224,-0.4,2.55},{0,-0.4,2.55},
+	{1.3,0,2.55},{1.3,-0.728,2.55},{0.728,-1.3,2.55},{0,-1.3,2.55},
+	{1.3,0,2.4},{1.3,-0.728,2.4},{0.728,-1.3,2.4},{0,-1.3,2.4},{0,0,0},
+	{1.425,-0.798,0},{1.5,0,0.075},{1.425,0,0},{0.798,-1.425,0},
+	{0,-1.5,0.075},{0,-1.425,0},{1.5,-0.84,0.075},{0.84,-1.5,0.075}
+    };
+
+    static float tex[2][2][2] = {{{0, 0},{1, 0}},{{0, 1},{1, 1}}};
+
+    if ( !glIsList( teapotList ) ) {
+	float p[4][4][3], q[4][4][3], r[4][4][3], s[4][4][3];
+	long grid = 14;
+	
+	teapotList = glGenLists( 1 );
+	glNewList( teapotList, GL_COMPILE );
+	glPushMatrix();
+	glRotatef( 270.0, 1.0, 0.0, 0.0 );
+	glScalef( 0.5, 0.5, 0.5 );
+	glTranslatef( 0.0, 0.0, -1.5 );
+	for ( long i = 0; i < 10; i++ ) {
+	    for ( long j = 0; j < 4; j++ ) {
+		for ( long k = 0; k < 4; k++ ) {
+		    for ( long l = 0; l < 3; l++ ) {
+			p[j][k][l] = cpdata[patchdata[i][j*4+k]][l];
+			q[j][k][l] = cpdata[patchdata[i][j*4+(3-k)]][l];
+			if ( l == 1 ) 
+			    q[j][k][l] *= -1.0;
+			if ( i < 6 ) {
+			    r[j][k][l] = cpdata[patchdata[i][j*4+(3-k)]][l];
+			    if ( l == 0 )
+				r[j][k][l] *= -1.0;
+			    s[j][k][l] = cpdata[patchdata[i][j*4+k]][l];
+			    if ( l == 0 )
+				s[j][k][l] *= -1.0;
+			    if ( l == 1 )
+				s[j][k][l] *= -1.0;
+			}
+		    }
+		}
+	    }
+	    glMap2f( GL_MAP2_TEXTURE_COORD_2, 0, 1, 2, 2, 0, 1, 4, 2, 
+		    &tex[0][0][0] );
+	    glMap2f( GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &p[0][0][0] );
+	    glEnable( GL_MAP2_VERTEX_3);
+	    glEnable(GL_MAP2_TEXTURE_COORD_2 );
+	    glMapGrid2f( grid, 0.0, 1.0, grid, 0.0, 1.0 );
+	    glEvalMesh2( GL_LINE, 0, grid, 0, grid );
+	    glMap2f( GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &q[0][0][0] );
+	    glEvalMesh2( GL_LINE, 0, grid, 0, grid );
+	    if ( i < 6 ) {
+		glMap2f( GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4,
+			 &r[0][0][0]);
+		glEvalMesh2( GL_LINE, 0, grid, 0, grid );
+		glMap2f( GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4,
+			 &s[0][0][0] );
+		glEvalMesh2( GL_LINE, 0, grid, 0, grid );
+	    }
+	}
+	glDisable(GL_MAP2_VERTEX_3);
+	glDisable(GL_MAP2_TEXTURE_COORD_2);
+	glPopMatrix();
+	glEndList();
+    }
+
+    glCallList( teapotList );
+}
diff --git a/examples/opengl/overlay/glteapots.h b/examples/opengl/overlay/glteapots.h
new file mode 100644
index 0000000..11f4bef
--- /dev/null
+++ b/examples/opengl/overlay/glteapots.h
@@ -0,0 +1,62 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+/****************************************************************************
+**
+** This is a QGLWidget displaying a group of teapots and a rubber-band
+** in an overlay plane
+**
+****************************************************************************/
+
+#ifndef GLBOX_H
+#define GLBOX_H
+
+#include <qgl.h>
+
+
+class GLTeapots : public QGLWidget
+{
+    Q_OBJECT
+
+public:
+
+    GLTeapots( QWidget* parent, const char* name );
+    ~GLTeapots();
+
+protected:
+
+    void		initializeGL();
+    void		paintGL();
+    void		resizeGL( int w, int h );
+
+    void		initializeOverlayGL();
+    void		paintOverlayGL();
+    void		resizeOverlayGL( int w, int h );
+
+    void		mousePressEvent( QMouseEvent* e );
+    void		mouseMoveEvent( QMouseEvent* e );
+    void		mouseReleaseEvent( QMouseEvent* e );
+
+    void		renderTeapot( GLfloat x, GLfloat y, GLfloat ambr,
+				      GLfloat ambg, GLfloat ambb, GLfloat difr,
+				      GLfloat difg, GLfloat difb, 
+				      GLfloat specr, GLfloat specg, 
+				      GLfloat specb, GLfloat shine );
+
+    void		teapot();
+
+private:
+    GLuint teapotList;
+    QPoint rubberP1;
+    QPoint rubberP2;
+    bool rubberOn;
+};
+
+
+#endif // GLBOX_H
diff --git a/examples/opengl/overlay/main.cpp b/examples/opengl/overlay/main.cpp
new file mode 100644
index 0000000..2939ecb
--- /dev/null
+++ b/examples/opengl/overlay/main.cpp
@@ -0,0 +1,52 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+//
+// Qt OpenGL example: Box
+//
+// A small example showing how a GLWidget can be used just as any Qt widget
+// 
+// File: main.cpp
+//
+// The main() function 
+// 
+
+#include "globjwin.h"
+#include <qapplication.h>
+#include <qgl.h>
+#include <qmessagebox.h>
+
+/*
+  The main program is here. 
+*/
+
+int main( int argc, char **argv )
+{
+    QApplication::setColorSpec( QApplication::CustomColor );
+    QApplication a(argc,argv);
+
+    if ( !QGLFormat::hasOpenGL() ) {
+	qWarning( "This system has no OpenGL support. Exiting." );
+	return -1;
+    }
+
+    // Check for existence of overlays
+    if ( !QGLFormat::hasOpenGLOverlays() ) {
+	QMessageBox::critical( 0, qApp->argv()[0], 
+			       "This system does not support OpenGL overlays",
+			       "Exit" );
+	return 1;
+    }
+
+    GLObjectWindow w;
+    w.resize( 400, 350 );
+    a.setMainWidget( &w );
+
+    w.show();
+    return a.exec();
+}
diff --git a/examples/opengl/overlay/overlay.doc b/examples/opengl/overlay/overlay.doc
new file mode 100644
index 0000000..7a10b3c
--- /dev/null
+++ b/examples/opengl/overlay/overlay.doc
@@ -0,0 +1,16 @@
+/*!   \page opengl-overlay-example.html
+
+  \ingroup opengl-examples
+  \title OpenGL Overlay Example
+
+This example demonstrates how to use OpenGL overlays with the Qt OpenGL
+Extension. It features a QGLWidget with a relatively expensive redrawing
+operation, and rubber-band drawing in the overlay plane. Using the
+overlay has the advantage that the rubber-band may be drawn and erased
+without damaging the image in the main plane, so costly redraws are
+avoided.
+
+See \c{$QTDIR/examples/opengl/overlay} for the source code.
+
+*/
+
diff --git a/examples/opengl/overlay/overlay.pro b/examples/opengl/overlay/overlay.pro
new file mode 100644
index 0000000..bc08165
--- /dev/null
+++ b/examples/opengl/overlay/overlay.pro
@@ -0,0 +1,14 @@
+TEMPLATE	= app
+TARGET		= overlay
+
+CONFIG		+= qt opengl warn_on release
+CONFIG -= dlopen_opengl
+DEPENDPATH	= ../include
+
+REQUIRES        = opengl
+
+HEADERS		= glteapots.h \
+		  globjwin.h
+SOURCES		= glteapots.cpp \
+		  globjwin.cpp \
+		  main.cpp