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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia Plc 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef GLWIDGET_H
+#define GLWIDGET_H
+
+#include <QOpenGLWidget>
+#include <QOpenGLFunctions>
+#include <QOpenGLBuffer>
+#include <QVector3D>
+#include <QMatrix4x4>
+#include <QTime>
+#include <QVector>
+#include <QPushButton>
+
+class Bubble;
+class MainWindow;
+
+QT_FORWARD_DECLARE_CLASS(QOpenGLTexture)
+QT_FORWARD_DECLARE_CLASS(QOpenGLShader)
+QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)
+
+class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
+{
+    Q_OBJECT
+public:
+    GLWidget(MainWindow *mw, bool button, const QColor &background);
+    ~GLWidget();
+
+public slots:
+    void setScaling(int scale);
+    void setLogo();
+    void setTexture();
+    void setShowBubbles(bool);
+    void setTransparent(bool transparent);
+
+private slots:
+    void handleButtonPress();
+
+protected:
+    void resizeGL(int w, int h) Q_DECL_OVERRIDE;
+    void paintGL() Q_DECL_OVERRIDE;
+    void initializeGL() Q_DECL_OVERRIDE;
+
+private:
+    void paintTexturedCube();
+    void paintQtLogo();
+    void createGeometry();
+    void createBubbles(int number);
+    void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4);
+    void extrude(qreal x1, qreal y1, qreal x2, qreal y2);
+
+    MainWindow *m_mainWindow;
+    qreal m_fAngle;
+    qreal m_fScale;
+    bool m_showBubbles;
+    QVector<QVector3D> m_vertices;
+    QVector<QVector3D> m_normals;
+    bool m_qtLogo;
+    QList<Bubble *> m_bubbles;
+    int m_frames;
+    QTime m_time;
+    QOpenGLShader *m_vshader1;
+    QOpenGLShader *m_fshader1;
+    QOpenGLShader *m_vshader2;
+    QOpenGLShader *m_fshader2;
+    QOpenGLShaderProgram *m_program1;
+    QOpenGLShaderProgram *m_program2;
+    QOpenGLTexture *m_texture;
+    QOpenGLBuffer m_vbo1;
+    QOpenGLBuffer m_vbo2;
+    int m_vertexAttr1;
+    int m_normalAttr1;
+    int m_matrixUniform1;
+    int m_vertexAttr2;
+    int m_normalAttr2;
+    int m_texCoordAttr2;
+    int m_matrixUniform2;
+    int m_textureUniform2;
+    bool m_transparent;
+    QPushButton *m_btn;
+    bool m_hasButton;
+    QColor m_background;
+};
+
+#endif