/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
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** 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.
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**
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****************************************************************************/

#ifndef MAINWIDGET_H
#define MAINWIDGET_H

#include <QtOpenGL/QGLWidget>
#include <QtOpenGL/QGLFunctions>

#include <QMatrix4x4>
#include <QQuaternion>
#include <QVector2D>

QT_BEGIN_NAMESPACE
class QBasicTimer;
class QGLShaderProgram;
QT_END_NAMESPACE

class GeometryEngine;

class MainWidget : public QGLWidget, protected QGLFunctions
{
    Q_OBJECT
public:
    explicit MainWidget(QWidget *parent = 0);
    virtual ~MainWidget();

signals:

public slots:

protected:
    void mousePressEvent(QMouseEvent *e);
    void mouseReleaseEvent(QMouseEvent *e);
    void timerEvent(QTimerEvent *e);

    void initializeGL();
    void resizeGL(int w, int h);
    void paintGL();

    void initShaders();
    void initTextures();

private:
    QBasicTimer *timer;
    QGLShaderProgram *program;
    GeometryEngine *geometries;

    GLuint texture;

    QMatrix4x4 projection;

    QVector2D mousePressPosition;
    QVector3D rotationAxis;
    qreal angularSpeed;
    QQuaternion rotation;
};

#endif // MAINWIDGET_H