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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/qgl.h   3.2.1   edited Jul 7 08:24 $
    **
    ** 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
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    **********************************************************************/

    #ifndef QGL_H
    #define QGL_H

    #ifndef QT_H
    #include "qwidget.h"
    #include "qglcolormap.h"
    #endif // QT_H

    #if !defined( QT_MODULE_OPENGL ) || defined( QT_LICENSE_PROFESSIONAL )
    #define QM_EXPORT_OPENGL
    #else
    #define QM_EXPORT_OPENGL Q_EXPORT
    #endif

    #ifndef QT_NO_COMPAT
    #define QGL_VERSION	450
    #define QGL_VERSION_STR	"4.5"
    QM_EXPORT_OPENGL inline const char *qGLVersion() {
        qObsolete( 0, "qGLVersion", "qVersion" );
        return QGL_VERSION_STR;
    }
    #endif

    #if defined(Q_WS_WIN)
    # include "qt_windows.h"
    #endif

    #if defined(Q_WS_MAC)
    #if !defined( QMAC_OPENGL_DOUBLEBUFFER )
    /* This macro is different now. If the macro is not defined QGLWidget will
     * try to determine when you need double buffering.  If set to 0 it will
     * never double buffer and *can* be acclerated. If set to 1 (the default)
     * it will always double buffer. Unlike before the value of this macro does
     * not upset binary compatability either. */
    #if QT_MACOSX_VERSION >= 0x1020
    # define QMAC_OPENGL_DOUBLEBUFFER 0
    #endif
    #endif
    # include <OpenGL/gl.h>
    # include <OpenGL/glu.h>
    #else
    # include <GL/gl.h>
    # include <GL/glu.h>
    #endif

    #if defined(Q_WS_WIN) || defined(Q_WS_MAC)
    class QGLCmap;
    #endif

    class QPixmap;
    #if defined(Q_WS_X11)
    class QGLOverlayWidget;
    #endif

    // Namespace class:
    class QM_EXPORT_OPENGL 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 QM_EXPORT_OPENGL 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 QM_EXPORT_OPENGL bool operator==( const QGLFormat&,
    					     const QGLFormat& );
        friend QM_EXPORT_OPENGL bool operator!=( const QGLFormat&,
    					     const QGLFormat& );
    private:
        uint opts;
        int pln;
    };

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

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

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

        QGLFormat format() const;
        QGLFormat requestedFormat() 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(); // ### 4.0: make this public - needed for multithreading stuff

    #if defined(Q_WS_WIN)
        virtual int choosePixelFormat( void* pfd, HDC pdc );
    #endif
    #if defined(Q_WS_X11)
        virtual void* tryVisual( const QGLFormat& f, int bufDepth = 1 );
        virtual void* chooseVisual();
    #endif
    #if defined(Q_WS_MAC)
        virtual void* chooseMacVisual(GDHandle);
    #endif

        bool deviceIsPixmap() const;
        bool windowCreated() const;
        void setWindowCreated( bool on );
        bool initialized() const;
        void setInitialized( bool on );
        void generateFontDisplayLists( const QFont & fnt, int listBase );

        uint colorIndex( const QColor& c ) const;
        void setValid( bool valid );
        void setDevice( QPaintDevice *pDev );

    protected:
    #if  defined(Q_WS_WIN)
        HGLRC rc;
        HDC dc;
        WId	win;
        int pixelFormatId;
        QGLCmap* cmap;
    #elif defined(Q_WS_X11) || defined(Q_WS_MAC)
        void* vi;
        void* cx;
    #if defined(Q_WS_X11)
        Q_UINT32 gpm;
    #endif
    #endif
        QGLFormat glFormat;
        QGLFormat reqFormat;
        static QGLContext*	currentCtx;

    private:
        void init( QPaintDevice *dev = 0 );
        class Private {
        public:
    	bool valid;
    	bool sharing;
    	bool initDone;
    	bool crWin;
    	QPaintDevice* paintDevice;
    	QColor transpColor;
    #ifdef Q_WS_MAC
    	QRect oldR;
    #endif
        };
        Private* d;

        friend class QGLWidget;
    #ifdef Q_WS_MAC
        void fixBufferRect();
    #endif

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

    class QM_EXPORT_OPENGL QGLWidget : public QWidget, public QGL
    {
        Q_OBJECT
    public:
        QGLWidget( QWidget* parent=0, const char* name=0,
    	       const QGLWidget* shareWidget = 0, WFlags f=0 );
        QGLWidget( QGLContext *context, QWidget* parent, 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();
        void doneCurrent();

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

        QGLFormat format() const;
    #ifndef Q_QDOC
        virtual void setFormat( const QGLFormat& format );
    #endif

        const QGLContext* context() const;
    #ifndef Q_QDOC
        virtual void setContext( QGLContext* context,
    			     const QGLContext* shareContext = 0,
    			     bool deleteOldContext = TRUE );
    #endif

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

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

        static QImage convertToGLFormat( const QImage& img );

        void setMouseTracking( bool enable );
        virtual void  reparent( QWidget* parent, WFlags f, const QPoint& p,
    			    bool showIt = FALSE );

        const QGLColormap & colormap() const;
        void  setColormap( const QGLColormap & map );

        void renderText( int x, int y, const QString & str,
    		     const QFont & fnt = QFont(), int listBase = 2000 );
        void renderText( double x, double y, double z, const QString & str,
    		     const QFont & fnt = QFont(), int listBase = 2000 );
    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:
        int displayListBase( const QFont & fnt, int listBase );
        void cleanupColormaps();
        void init( QGLContext *context, const QGLWidget* shareWidget );
        bool renderCxPm( QPixmap* pm );
        QGLContext* glcx;
        bool autoSwap;

        QGLColormap cmap;

    #if defined(Q_WS_WIN) || defined(Q_WS_MAC)
        QGLContext* olcx;
    #elif defined(Q_WS_X11)
        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

    #if defined(Q_WS_MAC)
    private:
        const QGLContext *slcx;
        uint pending_fix : 1,
    	 glcx_dblbuf : 2,
    	 dblbuf : 1,
    	 clp_serial : 15;
        QPixmap *gl_pix;
        QGLFormat req_format;

        void macInternalRecreateContext( QGLContext *ctx,
    				     const QGLContext* = NULL,
    				     bool update = TRUE );
        bool macInternalDoubleBuffer( bool fix = TRUE );
        virtual void setRegionDirty( bool );
        virtual void macWidgetChangedWindow();
    #endif
    private slots:
        void macInternalFixBufferRect();
    };

    //
    // 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 d->valid;
    }

    inline void QGLContext::setValid( bool valid )
    {
        d->valid = valid;
    }

    inline bool QGLContext::isSharing() const
    {
        return d->sharing;
    }

    inline QGLFormat QGLContext::format() const
    {
        return glFormat;
    }

    inline QGLFormat QGLContext::requestedFormat() const
    {
        return reqFormat;
    }

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

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

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

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

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

    inline void QGLContext::setInitialized( bool on )
    {
        d->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