volumerenderer.h

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#ifndef VOLUMERENDERER_H
#define VOLUMERENDERER_H

#include <QtGui>
#include <QtOpenGL>
#include <QGLWidget>

#include "GL/glext.h"

#include "arthurwidgets.h"

#include "Volume.h"
#include "renderingoptions.h"

/****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 class VolumeRenderer : public QGLWidget
 {
     Q_OBJECT

 public:
     VolumeRenderer(QWidget *parent = 0);

     ~VolumeRenderer();

         //void paint(QPainter *p);

         //void paintEvent(QPaintEvent *e);

         QSize minimumSizeHint() const;
         QSize sizeHint() const;

 public:
    void setVolume(Volume* volume);
    void setTransfer();
    void setRenderingOptions(RenderingOptions *options);

     public slots:
         void setGradientStops(const QGradientStops &stops);
 public slots:
     void setXRotation(int angle);
     void setYRotation(int angle);
     void setZRotation(int angle);

 signals:
     void xRotationChanged(int angle);
     void yRotationChanged(int angle);
     void zRotationChanged(int angle);

 protected:
     virtual void initializeGL();
     virtual void paintGL();
     virtual void resizeGL(int width, int height);
     void mousePressEvent(QMouseEvent *event);
     void mouseMoveEvent(QMouseEvent *event);

 private:
     QGradientStops m_stops; 
     QImage *image; 
     QImage transferLUT; 
     QRgb transfer(float value);


     void updateTransfer();
 private:
     int xRot;
     int yRot;
     int zRot;
     QPoint lastPos;
 private:
     QGLShaderProgram *program;
     int vertexLocation, texCoordLocation;
     int n0Location, uLocation, vLocation;
     int NLocation, volumeSizeLocation, volumeResolutionLocation;
     int samplerLocation;
     int lightColorLocation;
     int ambientColorLocation;
     int diffuseColorLocation;
     int specularColorLocation;
     int specularExponentLocation;
     int transferLocation;
     int k1Location, k2Location;

     int width, height; // witdh and height of viewport

     Volume *volume;
     RenderingOptions *options;
     GLuint textureName;
     GLuint transferTextureName;

     PFNGLTEXIMAGE3DEXTPROC glTexImage3DEXT1;
     PFNGLACTIVETEXTUREPROC glActiveTextureEXT1;

 };

#endif // VOLUMERENDERER_H