/****************************************************************************
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** Copyright (C) 2016 The Qt Company Ltd.
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**
** This file is part of the QtQuick module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
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** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
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****************************************************************************/

#ifndef QSGWINDOWSRENDERLOOP_P_H
#define QSGWINDOWSRENDERLOOP_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/QObject>
#include <QtCore/QElapsedTimer>

#include <QtGui/QOpenGLContext>

#include "qsgrenderloop_p.h"

QT_BEGIN_NAMESPACE

class QSGRenderContext;
class QSGDefaultRenderContext;

class QSGWindowsRenderLoop : public QSGRenderLoop
{
    Q_OBJECT
public:
    explicit QSGWindowsRenderLoop();
    ~QSGWindowsRenderLoop();

    void show(QQuickWindow *window) override;
    void hide(QQuickWindow *window) override;

    void windowDestroyed(QQuickWindow *window) override;

    void exposureChanged(QQuickWindow *window) override;
    QImage grab(QQuickWindow *window) override;

    void update(QQuickWindow *window) override;
    void maybeUpdate(QQuickWindow *window) override;

    QAnimationDriver *animationDriver() const override { return m_animationDriver; }

    QSGContext *sceneGraphContext() const override { return m_sg; }
    QSGRenderContext *createRenderContext(QSGContext *) const override;

    void releaseResources(QQuickWindow *) override;

    void render();
    void renderWindow(QQuickWindow *window);

    bool event(QEvent *event) override;
    bool anyoneShowing() const;

    bool interleaveIncubation() const override;

public Q_SLOTS:
    void started();
    void stopped();

private:
    struct WindowData {
        QQuickWindow *window;
        bool pendingUpdate;
    };

    void handleObscurity();
    void maybePostUpdateTimer();
    WindowData *windowData(QQuickWindow *window);

    QList<WindowData> m_windows;

    QOpenGLContext *m_gl;
    QSGContext *m_sg;
    QSGDefaultRenderContext *m_rc;

    QAnimationDriver *m_animationDriver;

    int m_updateTimer;
    int m_animationTimer;

    int m_vsyncDelta;
};

QT_END_NAMESPACE

#endif // QSGWINDOWSRENDERLOOP_P_H