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# qgl.h

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

    /****************************************************************************
    ** $Id: qt/src/opengl/qgl.h   2.3.1   edited 2001-01-26 $
    **
    ** Definition of OpenGL classes for Qt
    **
    ** Created : 970112
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the opengl module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
    **
    ** Licensees holding valid Qt Enterprise Edition licenses may use this
    ** file in accordance with the Qt Commercial License Agreement provided
    ** with the Software.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    **********************************************************************/

    #ifndef QGL_H
    #define QGL_H

    #ifndef QT_H
    #include <qwidget.h>
    #endif // QT_H

    #define QGL_VERSION     450
    #define QGL_VERSION_STR "4.5"

    Q_EXPORT const char *qGLVersion();

    #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 <qt_windows.h>
    #endif

    #include <GL/gl.h>
    #include <GL/glu.h>

    class QGLColorMap;
    class QPixmap;
    #if defined(Q_GLX)
    class QGLOverlayWidget;
    #endif

    // Namespace class:
    class Q_EXPORT QGL
    {
    public:
        enum FormatOption {
            DoubleBuffer            = 0x0001,
            DepthBuffer             = 0x0002,
            Rgba                    = 0x0004,
            AlphaChannel            = 0x0008,
            AccumBuffer             = 0x0010,
            StencilBuffer           = 0x0020,
            StereoBuffers           = 0x0040,
            DirectRendering         = 0x0080,
            HasOverlay              = 0x0100,
            SingleBuffer            = DoubleBuffer  << 16,
            NoDepthBuffer           = DepthBuffer   << 16,
            ColorIndex              = Rgba          << 16,
            NoAlphaChannel          = AlphaChannel  << 16,
            NoAccumBuffer           = AccumBuffer   << 16,
            NoStencilBuffer         = StencilBuffer << 16,
            NoStereoBuffers         = StereoBuffers << 16,
            IndirectRendering       = DirectRendering << 16,
            NoOverlay               = HasOverlay << 16
        };
    };

    class Q_EXPORT QGLFormat : public QGL
    {
    public:
        QGLFormat();
        QGLFormat( int options, int plane = 0 );

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

        int                 plane() const;
        void                setPlane( int plane );

        void                setOption( FormatOption opt );
        bool                testOption( FormatOption opt ) const;

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

        static QGLFormat    defaultOverlayFormat();
        static void         setDefaultOverlayFormat( const QGLFormat& f );

        static bool         hasOpenGL();
        static bool         hasOpenGLOverlays();

        friend Q_EXPORT bool operator==( const QGLFormat&, const QGLFormat& );
        friend Q_EXPORT bool operator!=( const QGLFormat&, const QGLFormat& );

    private:
        uint opts;
        int pln;
    };

    Q_EXPORT bool operator==( const QGLFormat&, const QGLFormat& );
    Q_EXPORT bool operator!=( const QGLFormat&, const QGLFormat& );

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

        virtual bool        create( const QGLContext* shareContext = 0 );
        bool                isValid() const;
        bool                isSharing() const;
        virtual void        reset();

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

        virtual void        makeCurrent();
        virtual void        swapBuffers() const;

        QPaintDevice*       device() const;

        QColor              overlayTransparentColor() const;

        static const QGLContext*    currentContext();

    protected:
        virtual bool        chooseContext( const QGLContext* shareContext = 0 );
        virtual void        doneCurrent();

    #if defined(Q_WGL)
        virtual int         choosePixelFormat( void* pfd, HDC pdc );
    #elif defined(Q_GLX)
        virtual void*       tryVisual( const QGLFormat& f, int bufDepth = 1 );
        virtual void*       chooseVisual();
    #endif

        bool                deviceIsPixmap() const;
        bool                windowCreated() const;
        void                setWindowCreated( bool on );
        bool                initialized() const;
        void                setInitialized( bool on );

        uint                colorIndex( const QColor& c ) const;

    protected:
    #if defined(Q_WGL)
        HGLRC               rc;
        HDC                 dc;
        WId                 win;
        int                 pixelFormatId;
        QGLColorMap*                cmap;
    #elif defined(Q_GLX)
        void*               vi;
        void*               cx;
        Q_UINT32            gpm;
    #endif

        QGLFormat           glFormat;

    private:
        bool                valid;
        bool                sharing;
        bool                initDone;
        bool                crWin;
        QPaintDevice*       paintDevice;
        QColor              transpColor;
        static QGLContext*  currentCtx;

        friend class QGLWidget;

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

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

        void                qglColor( const QColor& c ) const;
        void                qglClearColor( const QColor& c ) const;

        bool                isValid() const;
        bool                isSharing() const;
        virtual void        makeCurrent();

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

        QGLFormat           format() const;
    #if 1
        virtual void        setFormat( const QGLFormat& format ); // OBSOLETE
    #endif

        const QGLContext*   context() const;
    #if 1
        virtual void        setContext( QGLContext* context,
                                        const QGLContext* shareContext = 0,
                                        bool deleteOldContext = TRUE ); // OBSOLETE
    #endif

        virtual QPixmap     renderPixmap( int w = 0, int h = 0,
                                          bool useContext = FALSE );

        virtual void        makeOverlayCurrent();
        const QGLContext*   overlayContext() const;

        void                setMouseTracking( bool enable );

        static QImage       convertToGLFormat( const QImage& img );

    public slots:
        virtual void        updateGL();
        virtual void        updateOverlayGL();

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

        virtual void        initializeOverlayGL();
        virtual void        resizeOverlayGL( int w, int h );
        virtual void        paintOverlayGL();

        void                setAutoBufferSwap( bool on );
        bool                autoBufferSwap() const;

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

        virtual void        glInit();
        virtual void        glDraw();

    private:
        void                init( const QGLFormat& fmt,
                                  const QGLWidget* shareWidget );
        bool                renderCxPm( QPixmap* pm );
        QGLContext*         glcx;
        bool                autoSwap;

    #if defined(Q_WGL)
        QGLContext*         olcx;
    #elif defined(Q_GLX)
        QGLOverlayWidget*   olw;
        friend class QGLOverlayWidget;
    #endif

    private:        // Disabled copy constructor and operator=
    #if defined(Q_DISABLE_COPY)
        QGLWidget( const QGLWidget& );
        QGLWidget&          operator=( const QGLWidget& );
    #endif
    };

    //
    // QGLFormat inline functions
    //

    inline bool QGLFormat::doubleBuffer() const
    {
        return testOption( DoubleBuffer );
    }

    inline bool QGLFormat::depth() const
    {
        return testOption( DepthBuffer );
    }

    inline bool QGLFormat::rgba() const
    {
        return testOption( Rgba );
    }

    inline bool QGLFormat::alpha() const
    {
        return testOption( AlphaChannel );
    }

    inline bool QGLFormat::accum() const
    {
        return testOption( AccumBuffer );
    }

    inline bool QGLFormat::stencil() const
    {
        return testOption( StencilBuffer );
    }

    inline bool QGLFormat::stereo() const
    {
        return testOption( StereoBuffers );
    }

    inline bool QGLFormat::directRendering() const
    {
        return testOption( DirectRendering );
    }

    inline bool QGLFormat::hasOverlay() const
    {
        return testOption( HasOverlay );
    }

    //
    // QGLContext inline functions
    //

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

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

    inline bool QGLContext::deviceIsPixmap() const
    {
        return paintDevice->devType() == QInternal::Pixmap;
    }

    inline bool QGLContext::windowCreated() const
    {
        return crWin;
    }

    inline void QGLContext::setWindowCreated( bool on )
    {
        crWin = on;
    }

    inline bool QGLContext::initialized() const
    {
        return initDone;
    }

    inline void QGLContext::setInitialized( bool on )
    {
        initDone = on;
    }

    inline const QGLContext* QGLContext::currentContext()
    {
        return currentCtx;
    }

    //
    // QGLWidget inline functions
    //

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

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

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

    inline void QGLWidget::setAutoBufferSwap( bool on )
    {
        autoSwap = on;
    }

    inline bool QGLWidget::autoBufferSwap() const
    {
        return autoSwap;
    }

    #endif // QGL_H