This is the verbatim text of the qgl.h include file. It is is provided only for illustration; the copyright remains with Troll Tech

/****************************************************************************
** $Id: qgl.h,v 1.4 1997/10/13 13:03:02 hanord Exp $
**
** Definition of OpenGL classes for Qt
**
** Created : 970112
**
** Copyright (C) 1997 by Troll Tech AS.  All right reserved.
**
*****************************************************************************/

#ifndef QGL_H
#define QGL_H

#include <qwidget.h>
#if !(defined(Q_WGL) || defined(Q_GLX))
#if defined(_OS_WIN32_)
#define Q_WGL
#else
#define Q_GLX
#endif
#endif
#if defined(Q_WGL)
#include <windows.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>


class QGLFormat
{
public:
    QGLFormat( bool doubleBuffer=TRUE );
    QGLFormat( const QGLFormat & );
    virtual ~QGLFormat();

    QGLFormat &operator=( const QGLFormat & );

    bool    doubleBuffer() const;
    void    setDoubleBuffer( bool );
    bool    depth() const;
    void    setDepth( bool );
    bool    rgba() const;
    void    setRgba( bool );
    bool    alpha() const;
    void    setAlpha( bool );
    bool    accum() const;
    void    setAccum( bool );
    bool    stencil() const;
    void    setStencil( bool );
    bool    stereo() const;
    void    setStereo( bool );

    static const QGLFormat &defaultFormat();
    static void  setDefaultFormat( const QGLFormat & );

    static bool  hasOpenGL();

public:
    struct Internal : public QShared {
        bool    doubleBuffer;
        bool    depth;
        bool    rgba;
        bool    alpha;
        bool    accum;
        bool    stencil;
        bool    stereo;
    };

private:
    void    detach();
    Internal *data;
};


class QGLContext
{
public:
    QGLContext( const QGLFormat &, QPaintDevice * );
    virtual ~QGLContext();

    bool        isValid() const;

    const QGLFormat &format() const;
    void        setFormat( const QGLFormat & );

    QPaintDevice *device() const;

    void        makeCurrent();
    void        swapBuffers();

    bool        create();
    void        reset();

protected:
    bool        chooseContext();
#if defined(Q_WGL)
    virtual int choosePixelFormat( void * );
#elif defined(Q_GLX)
    virtual void *chooseVisual();
#endif
    void        doneCurrent();

protected:
#if defined(Q_WGL)
    HANDLE      rc;
    HANDLE      dc;
    HANDLE      win;
#endif
#if defined(Q_GLX)
    void       *vi;
    void       *cx;
#endif

private:
    bool        valid;
    QGLFormat   glFormat;
    QPaintDevice *paintDevice;

    friend class QGLWidget;

private:        // Disabled copy constructor and operator=
    QGLContext() {}
    QGLContext( const QGLContext & ) {}
    QGLContext &operator=( const QGLContext & ) { return *this; }
};


class QGLWidget : public QWidget
{
    Q_OBJECT
public:
    QGLWidget( QWidget *parent=0, const char *name=0 );
    QGLWidget( const QGLFormat &format, QWidget *parent=0, const char *name=0);
   ~QGLWidget();

    void        makeCurrent();
    bool        doubleBuffer() const;
    void        swapBuffers();

    bool        isValid() const;

    const QGLFormat  &format() const;
    void        setFormat( const QGLFormat & );

    const QGLContext *context() const;
    void        setContext( QGLContext * );

public slots:
    void        updateGL();

protected:
    virtual void paintGL();
    virtual void resizeGL( int w, int h );

    void        paintEvent( QPaintEvent * );
    void        resizeEvent( QResizeEvent * );

private:
    void        gl_init( QGLContext * );
    QGLContext *glcx;

private:        // Disabled copy constructor and operator=
    QGLWidget( const QGLWidget & ) {}
    QGLWidget &operator=( const QGLWidget & ) { return *this; }
};


//
// QGLFormat inline functions
//

inline bool QGLFormat::doubleBuffer() const
{
    return data->doubleBuffer;
}

inline bool QGLFormat::depth() const
{
    return data->depth;
}

inline bool QGLFormat::rgba() const
{
    return data->rgba;
}

inline bool QGLFormat::alpha() const
{
    return data->alpha;
}

inline bool QGLFormat::accum() const
{
    return data->accum;
}

inline bool QGLFormat::stencil() const
{
    return data->stencil;
}

inline bool QGLFormat::stereo() const
{
    return data->stereo;
}

//
// QGLContext inline functions
//

inline bool QGLContext::isValid() const
{
    return valid;
}
inline const QGLFormat &QGLContext::format() const
{
    return glFormat;
}

inline QPaintDevice *QGLContext::device() const
{
    return paintDevice;
}

//
// QGLWidget inline functions
//

inline bool QGLWidget::isValid() const
{
    return glcx->isValid();
}

inline void QGLWidget::makeCurrent()
{
    glcx->makeCurrent();
}

inline bool QGLWidget::doubleBuffer() const
{
    return glcx->format().doubleBuffer();
}

inline void QGLWidget::swapBuffers()
{
    glcx->swapBuffers();
}

inline const QGLFormat &QGLWidget::format() const
{
    return glcx->format();
}

inline const QGLContext *QGLWidget::context() const
{
    return glcx;
}

inline void QGLWidget::updateGL()
{
    repaint( FALSE );
}


#endif // QGL_H