/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
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**
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** modification, are permitted provided that the following conditions are
** met:
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**     notice, this list of conditions and the following disclaimer.
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**     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
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****************************************************************************/

#include <QWindow>

#include <QtGui/qopengl.h>
#include <QtGui/qopenglshaderprogram.h>

#include <QColor>
#include <QTime>
#include <QSharedPointer>

QT_BEGIN_NAMESPACE
class QOpenGLContext;
QT_END_NAMESPACE

class Renderer : public QObject
{
    Q_OBJECT
public:
    Renderer(const QSurfaceFormat &format, Renderer *share = 0, QScreen *screen = 0);

    QSurfaceFormat format() const { return m_format; }

public slots:
    void render(QSurface *surface, const QColor &color, const QSize &viewSize);

private:
    void initialize();

    qreal m_fAngle;
    bool m_showBubbles;
    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);
    QVector<QVector3D> vertices;
    QVector<QVector3D> normals;
    int vertexAttr;
    int normalAttr;
    int matrixUniform;
    int colorUniform;

    bool m_initialized;
    QSurfaceFormat m_format;
    QOpenGLContext *m_context;
    QOpenGLShaderProgram *m_program;
};

class HelloWindow : public QWindow
{
    Q_OBJECT
public:
    explicit HelloWindow(const QSharedPointer<Renderer> &renderer);

    void updateColor();

    void exposeEvent(QExposeEvent *event);

signals:
    void needRender(QSurface *surface, const QColor &color, const QSize &viewSize);

private slots:
    void render();

private:
    void mousePressEvent(QMouseEvent *);

    int m_colorIndex;
    QColor m_color;
    const QSharedPointer<Renderer> m_renderer;
};