/****************************************************************************
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** Copyright (C) 2017 The Qt Company Ltd.
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** This file is part of Qt 3D Studio.
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#ifndef Q3DS_QMLSTREAM_RENDERER_H
#define Q3DS_QMLSTREAM_RENDERER_H

#include "q3dsqmlstreamservice.h"

#include <QOpenGLFunctions>
#include <QSize>
#include <QThread>
#include <QWaitCondition>
#include <QMutex>

QT_BEGIN_NAMESPACE
class QQuickRenderControl;
class QQuickWindow;
class QQuickItem;
class QOpenGLContext;
class QOffscreenSurface;
class QOpenGLFramebufferObject;
class QOpenGLShaderProgram;
class QOpenGLBuffer;
class QOpenGLVertexArrayObject;
QT_END_NAMESPACE

class Q3DSQmlStreamRenderer;

class Q3DSQmlStreamEventHandler : public QObject
{
    Q_OBJECT
public:
    Q3DSQmlStreamEventHandler(Q3DSQmlStreamRenderer *renderer);
    bool event(QEvent *e) Q_DECL_OVERRIDE;

private:
    Q3DSQmlStreamRenderer *m_renderer;
};

class Q3DSQmlStreamRenderer : public QObject,
                               public IQ3DSQmlStreamRenderer
{
    Q_OBJECT
public:
    Q3DSQmlStreamRenderer();
    virtual ~Q3DSQmlStreamRenderer();

    bool initialize(QOpenGLContext *context, QSurface *surface) override;

    QSize getDesiredSize() override;
    E_TEXTURE_FORMAT getDesiredFormat() override;
    bool isUpdateRequested() override;

    void render() override;

    void uninitialize() override;

    void setItem(QQuickItem *item);

    bool event(QEvent *event) Q_DECL_OVERRIDE;

private:

    void updateSizes();
    void requestUpdate();
    void cleanup();
    void initializeRender();
    void renderTexture();
    void initializeFboCopy();

    QSize m_size;
    QMutex m_mutex, m_renderMutex;
    QWaitCondition m_waitCondition;

    QQuickRenderControl *m_renderControl;
    QQuickWindow *m_quickWindow;
    QQuickItem *m_rootItem;

    QOpenGLFramebufferObject *m_frameBuffer;
    QOpenGLShaderProgram *m_program;
    QOpenGLVertexArrayObject *m_vao;
    QOpenGLBuffer *m_vertices;
    QOpenGLContext *m_context;
    QOffscreenSurface *m_offscreenSurface;

    Q3DSQmlStreamEventHandler *m_renderObject;
    QThread *m_renderThread;

    bool m_requestUpdate;
    bool m_initialized;
    bool m_prepared;
    bool m_update;
    bool m_delayedUpdateRequest;

    friend class Q3DSQmlStreamEventHandler;
};

#endif // Q3DS_QMLSTREAM_RENDERER_H