8 files changed, 487 insertions, 0 deletions
diff --git a/examples/opengl/sharedbox/README b/examples/opengl/sharedbox/README
new file mode 100644
index 000000000..4959294d5
--- /dev/null
+++ b/examples/opengl/sharedbox/README
@@ -0,0 +1,8 @@
+
+The shared box example
+
+This example program is an extension of the "box" example program.
+
+It demonstrates how to use OpenGL display list sharing with QGLWidgets.
+
+
diff --git a/examples/opengl/sharedbox/glbox.cpp b/examples/opengl/sharedbox/glbox.cpp
new file mode 100644
index 000000000..f3ded8888
--- /dev/null
+++ b/examples/opengl/sharedbox/glbox.cpp
@@ -0,0 +1,211 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for TQt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+/****************************************************************************
+**
+** This is a simple TQGLWidget displaying a box
+**
+** The OpenGL code is mostly borrowed from Brian Pauls "spin" example
+** in the Mesa distribution
+**
+****************************************************************************/
+
+#include "glbox.h"
+
+// Initialize static class variables:
+
+// Shared display list id:
+GLuint GLBox::sharedDisplayList = 0;
+
+// Counter keeping track of number of GLBox instances sharing 
+// the display list, so that the last instance can delete it:
+int GLBox::sharedListUsers = 0;
+
+
+/*!
+  Create a GLBox widget
+*/
+
+GLBox::GLBox( TQWidget* parent, const char* name, const TQGLWidget* shareWidget )
+    : TQGLWidget( parent, name, shareWidget )
+{
+    xRot = yRot = zRot = 0.0;		// default object rotation
+    scale = 1.0;			// default object scale
+    object = 0;
+    localDisplayList = 0;
+}
+
+
+/*!
+  Set up the OpenGL rendering state. Robustly access shared display list.
+*/
+
+void GLBox::initializeGL()
+{
+    // Let OpenGL clear to black
+    qglClearColor( black ); 
+
+    glEnable(GL_DEPTH_TEST);
+
+    if ( sharedListUsers == 0 ) {	// No shared list has been made yet
+	sharedDisplayList = makeObject();	// Make one
+	object = sharedDisplayList;		// Use it
+	sharedListUsers++;				// Keep reference count
+	qDebug( "GLBox %s created shared display list.", name() );
+    }
+    else {				// There is a shared diplay list
+	if ( isSharing() ) {		// Can we access it?
+	    object = sharedDisplayList;		// Yes, use it
+	    sharedListUsers++;			// Keep reference count
+	    qDebug( "GLBox %s uses shared display list.", name() );
+	}
+	else {				
+	    localDisplayList = makeObject();	// No, roll our own
+	    object = localDisplayList;		// and use that
+	    qDebug( "GLBox %s uses private display list.", name() );
+	}
+    }
+}
+
+
+
+/*!
+  Release allocated resources
+*/
+
+GLBox::~GLBox()
+{
+    makeCurrent();				// We're going to do gl calls
+    if ( localDisplayList != 0 ) {		// Did we make our own?
+	glDeleteLists( localDisplayList, 1 );	// Yes, delete it
+	qDebug( "GLBox %s deleted private display list.", name() );
+    }
+    else {
+	sharedListUsers--;	// No, we used the shared one; keep refcount
+	if ( sharedListUsers == 0 ) { 			// Any sharers left?
+	    glDeleteLists( sharedDisplayList, 1 );	// No, delete it
+	    sharedDisplayList = 0;
+	    qDebug( "GLBox %s deleted shared display list.", name() );
+	}
+    }
+}
+
+
+/*!
+  Paint the box. The actual openGL commands for drawing the box are
+  performed here.
+*/
+
+void GLBox::paintGL()
+{
+    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+    glMatrixMode( GL_MODELVIEW );
+    glLoadIdentity();
+    glTranslatef( 0.0, 0.0, -3.0 );
+    glScalef( scale, scale, scale );
+
+    glRotatef( xRot, 1.0, 0.0, 0.0 ); 
+    glRotatef( yRot, 0.0, 1.0, 0.0 ); 
+    glRotatef( zRot, 0.0, 0.0, 1.0 );
+
+    glCallList( object );
+}
+
+
+
+
+/*!
+  Set up the OpenGL view port, matrix mode, etc.
+*/
+
+void GLBox::resizeGL( int w, int h )
+{
+    glViewport( 0, 0, (GLint)w, (GLint)h );
+    glMatrixMode( GL_PROJECTION );
+    glLoadIdentity();
+    glFrustum(-1.0, 1.0, -1.0, 1.0, 1.0, 10.0);
+}
+
+
+/*!
+  Generate an OpenGL display list for the object to be shown, i.e. the box
+*/
+
+GLuint GLBox::makeObject()
+{
+    GLuint list;
+
+    list = glGenLists( 1 );
+
+    glNewList( list, GL_COMPILE );
+
+    glBegin(GL_QUADS);
+    /* Front face */
+    qglColor( green );
+    glVertex3f(-1.0, 1.0, 1.0);
+    glVertex3f(1.0, 1.0, 1.0);
+    glVertex3f(1.0, -1.0, 1.0);
+    glVertex3f(-1.0, -1.0, 1.0);
+    /* Back face */
+    qglColor( yellow );
+    glVertex3f(-1.0, 1.0, -1.0);
+    glVertex3f(1.0, 1.0, -1.0);
+    glVertex3f(1.0, -1.0, -1.0);
+    glVertex3f(-1.0, -1.0, -1.0);
+    /* Top side face */
+    qglColor( blue );
+    glVertex3f(-1.0, 1.0, 1.0);
+    glVertex3f(1.0, 1.0, 1.0);
+    glVertex3f(1.0, 1.0, -1.0);
+    glVertex3f(-1.0, 1.0, -1.0);
+    /* Bottom side face */
+    qglColor( red );
+    glVertex3f(-1.0, -1.0, 1.0);
+    glVertex3f(1.0, -1.0, 1.0);
+    glVertex3f(1.0, -1.0, -1.0);
+    glVertex3f(-1.0, -1.0, -1.0);
+    glEnd();
+    glEndList();
+
+    return list;
+}
+
+
+/*!
+  Set the rotation angle of the object to \e degrees around the X axis.
+*/
+
+void GLBox::setXRotation( int degrees )
+{
+    xRot = (GLfloat)(degrees % 360);
+    updateGL();
+}
+
+
+/*!
+  Set the rotation angle of the object to \e degrees around the Y axis.
+*/
+
+void GLBox::setYRotation( int degrees )
+{
+    yRot = (GLfloat)(degrees % 360);
+    updateGL();
+}
+
+
+/*!
+  Set the rotation angle of the object to \e degrees around the Z axis.
+*/
+
+void GLBox::setZRotation( int degrees )
+{
+    zRot = (GLfloat)(degrees % 360);
+    updateGL();
+}
diff --git a/examples/opengl/sharedbox/glbox.h b/examples/opengl/sharedbox/glbox.h
new file mode 100644
index 000000000..089513d33
--- /dev/null
+++ b/examples/opengl/sharedbox/glbox.h
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for TQt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+/****************************************************************************
+**
+** This is a simple TQGLWidget displaying a box
+**
+****************************************************************************/
+
+#ifndef GLBOX_H
+#define GLBOX_H
+
+#include <qgl.h>
+
+
+class GLBox : public TQGLWidget
+{
+    Q_OBJECT
+
+public:
+
+    GLBox( TQWidget* parent, const char* name, const TQGLWidget* shareWidget=0 );
+    ~GLBox();
+
+public slots:
+
+    void		setXRotation( int degrees );
+    void		setYRotation( int degrees );
+    void		setZRotation( int degrees );
+
+protected:
+
+    void		initializeGL();
+    void		paintGL();
+    void		resizeGL( int w, int h );
+
+    virtual GLuint 	makeObject();
+
+private:
+
+    GLuint		object;
+    GLuint		localDisplayList;
+
+    static GLuint	sharedDisplayList;
+    static int		sharedListUsers;
+
+    GLfloat xRot, yRot, zRot, scale;
+
+};
+
+
+#endif // GLBOX_H
diff --git a/examples/opengl/sharedbox/globjwin.cpp b/examples/opengl/sharedbox/globjwin.cpp
new file mode 100644
index 000000000..f908add4b
--- /dev/null
+++ b/examples/opengl/sharedbox/globjwin.cpp
@@ -0,0 +1,99 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for TQt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include <qpushbutton.h>
+#include <qslider.h>
+#include <qlayout.h>
+#include <qframe.h>
+#include <qmenubar.h>
+#include <qpopupmenu.h>
+#include <qapplication.h>
+#include <qkeycode.h>
+#include "globjwin.h"
+#include "glbox.h"
+
+
+GLObjectWindow::GLObjectWindow( TQWidget* parent, const char* name )
+    : TQWidget( parent, name )
+{
+    // Create a menu
+    TQPopupMenu *file = new TQPopupMenu( this );
+    file->insertItem( "Delete Left TQGLWidget", this, 
+		      SLOT(deleteFirstWidget()) );
+    file->insertItem( "Exit",  qApp, SLOT(tquit()), CTRL+Key_Q );
+
+    // Create a menu bar
+    TQMenuBar *m = new TQMenuBar( this );
+    m->setSeparator( TQMenuBar::InWindowsStyle );
+    m->insertItem("&File", file );
+
+    // Create nice frames to put around the OpenGL widgets
+    TQFrame* f1 = new TQFrame( this, "frame1" );
+    f1->setFrameStyle( TQFrame::Sunken | TQFrame::Panel );
+    f1->setLineWidth( 2 );
+    TQFrame* f2 = new TQFrame( this, "frame2" );
+    f2->setFrameStyle( TQFrame::Sunken | TQFrame::Panel );
+    f2->setLineWidth( 2 );
+
+    // Create an OpenGL widget
+    c1 = new GLBox( f1, "glbox1" );
+    
+    // Create another OpenGL widget that shares display lists with the first
+    c2 = new GLBox( f2, "glbox2", c1 );
+
+    // Create the three sliders; one for each rotation axis
+    // Make them spin the boxes, but not in synch
+    TQSlider* x = new TQSlider ( 0, 360, 60, 0, TQSlider::Vertical, this, "xsl" );
+    x->setTickmarks( TQSlider::Left );
+    connect( x, SIGNAL(valueChanged(int)), c1, SLOT(setXRotation(int)) );
+    connect( x, SIGNAL(valueChanged(int)), c2, SLOT(setZRotation(int)) );
+
+    TQSlider* y = new TQSlider ( 0, 360, 60, 0, TQSlider::Vertical, this, "ysl" );
+    y->setTickmarks( TQSlider::Left );
+    connect( y, SIGNAL(valueChanged(int)), c1, SLOT(setYRotation(int)) );
+    connect( y, SIGNAL(valueChanged(int)), c2, SLOT(setXRotation(int)) );
+
+    TQSlider* z = new TQSlider ( 0, 360, 60, 0, TQSlider::Vertical, this, "zsl" );
+    z->setTickmarks( TQSlider::Left );
+    connect( z, SIGNAL(valueChanged(int)), c1, SLOT(setZRotation(int)) );
+    connect( z, SIGNAL(valueChanged(int)), c2, SLOT(setYRotation(int)) );
+
+
+    // Now that we have all the widgets, put them into a nice layout
+
+    // Put the sliders on top of each other
+    TQVBoxLayout* vlayout = new TQVBoxLayout( 20, "vlayout");
+    vlayout->addWidget( x );
+    vlayout->addWidget( y );
+    vlayout->addWidget( z );
+
+    // Put the GL widgets inside the frames
+    TQHBoxLayout* flayout1 = new TQHBoxLayout( f1, 2, 2, "flayout1");
+    flayout1->addWidget( c1, 1 );
+    TQHBoxLayout* flayout2 = new TQHBoxLayout( f2, 2, 2, "flayout2");
+    flayout2->addWidget( c2, 1 );
+
+    // Top level layout, puts the sliders to the left of the frame/GL widget
+    TQHBoxLayout* hlayout = new TQHBoxLayout( this, 20, 20, "hlayout");
+    hlayout->setMenuBar( m );
+    hlayout->addLayout( vlayout );
+    hlayout->addWidget( f1, 1 );
+    hlayout->addWidget( f2, 1 );
+
+}
+
+
+void GLObjectWindow::deleteFirstWidget()
+{
+    // Delete only c1; c2 will keep working and use the shared display list
+    if ( c1 ) {
+	delete c1;
+	c1 = 0;
+    }
+}
diff --git a/examples/opengl/sharedbox/globjwin.h b/examples/opengl/sharedbox/globjwin.h
new file mode 100644
index 000000000..c42f2ea72
--- /dev/null
+++ b/examples/opengl/sharedbox/globjwin.h
@@ -0,0 +1,39 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for TQt.  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 GLBox;
+
+class GLObjectWindow : public TQWidget
+{
+    Q_OBJECT
+public:
+    GLObjectWindow( TQWidget* parent = 0, const char* name = 0 );
+
+protected slots:
+
+    void		deleteFirstWidget();
+
+private:
+    GLBox* c1;
+    GLBox* c2;
+};
+
+
+#endif // GLOBJWIN_H
diff --git a/examples/opengl/sharedbox/main.cpp b/examples/opengl/sharedbox/main.cpp
new file mode 100644
index 000000000..13e474007
--- /dev/null
+++ b/examples/opengl/sharedbox/main.cpp
@@ -0,0 +1,42 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for TQt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+//
+// TQt OpenGL example: Shared Box
+//
+// A small example showing how to use OpenGL display list sharing
+// 
+// File: main.cpp
+//
+// The main() function 
+// 
+
+#include "globjwin.h"
+#include <qapplication.h>
+#include <qgl.h>
+
+/*
+  The main program is here. 
+*/
+
+int main( int argc, char **argv )
+{
+    TQApplication::setColorSpec( TQApplication::CustomColor );
+    TQApplication a(argc,argv);			
+
+    if ( !TQGLFormat::hasOpenGL() ) {
+	qWarning( "This system has no OpenGL support. Exiting." );
+	return -1;
+    }
+
+    GLObjectWindow w;
+    w.resize( 550, 350 );
+    a.setMainWidget( &w );
+    w.show();
+    return a.exec();
+}
diff --git a/examples/opengl/sharedbox/sharedbox.doc b/examples/opengl/sharedbox/sharedbox.doc
new file mode 100644
index 000000000..21e7a66a3
--- /dev/null
+++ b/examples/opengl/sharedbox/sharedbox.doc
@@ -0,0 +1,16 @@
+/*!   \page opengl-sharedbox-example.html
+
+  \ingroup opengl-examples
+  \title OpenGL Shared Box Example
+
+
+This example program is an extension of the \link
+opengl-box-example.html Box example\endlink.
+
+It demonstrates how to use OpenGL display list sharing with
+QGLWidgets.
+
+See \c{$QTDIR/examples/opengl/sharedbox} for the source code.
+
+*/
+
diff --git a/examples/opengl/sharedbox/sharedbox.pro b/examples/opengl/sharedbox/sharedbox.pro
new file mode 100644
index 000000000..30b92e8ca
--- /dev/null
+++ b/examples/opengl/sharedbox/sharedbox.pro
@@ -0,0 +1,14 @@
+TEMPLATE	= app
+TARGET		= sharedbox
+
+CONFIG		+= qt opengl warn_on release
+CONFIG -= dlopen_opengl
+DEPENDPATH	= ../include
+
+REQUIRES        = opengl
+
+HEADERS		= glbox.h \
+		  globjwin.h
+SOURCES		= glbox.cpp \
+		  globjwin.cpp \
+		  main.cpp