/****************************************************************************
**
** Copyright (C) 2013 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
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** 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,
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****************************************************************************/

#include <QWindow>

#include <QColor>
#include <QMutex>
#include <QOpenGLShaderProgram>
#include <QSharedPointer>
#include <QTimer>

class HelloWindow;

class Renderer : public QObject
{
    Q_OBJECT

public:
    explicit Renderer(const QSurfaceFormat &format, Renderer *share = 0, QScreen *screen = 0);

    QSurfaceFormat format() const { return m_format; }

    void setAnimating(HelloWindow *window, bool animating);

private slots:
    void render();

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;

    QList<HelloWindow *> m_windows;
    int m_currentWindow;

    QMutex m_windowLock;
};

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

    QColor color() const;
    void updateColor();

    void exposeEvent(QExposeEvent *event);

private:
    void mousePressEvent(QMouseEvent *);

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