renderer.h

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#ifndef WINDOW_SINGLETHREADED_H
#define WINDOW_SINGLETHREADED_H

#include <QWindow>
#include <QMatrix4x4>
#include <QTimer>
#include <QMutex>
#include <QThread>
#include <QImage>
#include <QOpenGLTexture>
#include <QUrl>

QT_FORWARD_DECLARE_CLASS(QOpenGLContext)
QT_FORWARD_DECLARE_CLASS(QOpenGLFramebufferObject)
QT_FORWARD_DECLARE_CLASS(QOffscreenSurface)
QT_FORWARD_DECLARE_CLASS(QQuickRenderControl)
QT_FORWARD_DECLARE_CLASS(QQuickWindow)
QT_FORWARD_DECLARE_CLASS(QQmlEngine)
QT_FORWARD_DECLARE_CLASS(QQmlError)
QT_FORWARD_DECLARE_CLASS(QQmlComponent)
QT_FORWARD_DECLARE_CLASS(QQuickItem)

#include <QTimer>
#include <QElapsedTimer>

class FrameCounter : public QObject
{
    Q_OBJECT

    QString         m_myname;
    quint32         m_count;
    QElapsedTimer   m_timer;
    QTimer          m_printer;

public:
    FrameCounter(const QString &name) : QObject(), m_myname(name), m_count(0)
    {
        m_printer.setInterval(30000);
        m_printer.setSingleShot(false);
        connect( &m_printer, SIGNAL(timeout()), this, SLOT(printFPS()) );
        m_printer.start();
        m_timer.start();
    }

public slots:
    void inc() { m_count++; }
    void printFPS() {
        double fps = (double) m_count / ( (double)m_timer.elapsed() / 1000.0 );
        qDebug() << m_myname << ": FPS = " << fps;
        m_count = 0;
        m_timer.restart();
    }
};

class WindowSingleThreaded;
class Snapper : public QThread
{
    Q_OBJECT

    WindowSingleThreaded *m_parent;

    bool                    m_snapping;

public:
    Snapper(WindowSingleThreaded *parent);
    ~Snapper();

public slots:
    void snapRequested();

signals:
    void resultReady();
};

class WindowSingleThreaded : public QWindow
{
    Q_OBJECT

    QUrl        m_url;
    QStringList m_loadMessages;

public:
    WindowSingleThreaded();
    ~WindowSingleThreaded();

    QQmlEngine *engine() { return m_qmlEngine; }

    Q_PROPERTY(QVariant query READ getQuery)
    Snapper *m_snapper;

public slots:
    void startQuick(const QUrl &url);
    void resize(QSize newSize);
    void manualUpdated(bool onoff);
    void render();
    void triggerSnap();
    void unload();
#ifdef GLCOPY
    GLuint lockFbo();
    void unlockFbo();
#endif
    QImage *getImage();
    void lock();
    void unlock();

    bool initialised() { return m_quickInitialized; }
    QVariant getQuery();
    void requestUpdate();

    QStringList loadMessages() { return m_loadMessages; }
    void addMessages(const QStringList &msgs) { m_loadMessages << msgs; }
    //qreal calculateDelta(quint64 duration, qreal min, qreal max);

    void sendMouseClick(quint32 x, quint32 y, qint32 type, bool onoff, quint8 click_count);
    void sendMouseMove(quint32 x, quint32 y, bool leaving);
    void sendMouseWheel(qint32 xdelta, qint32 ydelta);
    void sendKey(quint32 keycode, quint32 vkey, quint32 modifiers, const char *text, bool updown);
    void sendFocus(bool onoff);

    void wantFrame();

signals:
    //void updated(GLuint texid);
    void capped();
    void resized();
    void messages(const QStringList &messages);
    void snapWanted();

private slots:
    void run();
    void addQmlPath();

    void createFbo();
    void destroyFbo();
    void handleScreenChange();
    void handleWarnings(const QList<QQmlError> &warnings);
    void handleFocusChanged(QObject *obj);

private:
    void updateSizes();
    void resizeFbo();

    QMutex m_mutex;
    QImage m_image;
    bool m_frameChanged;
    bool m_forceRender;
    bool m_fboLocked;
    QOpenGLContext *m_context;
    QOffscreenSurface *m_offscreenSurface;
    QQuickRenderControl *m_renderControl;
    QQuickWindow *m_quickWindow;
    QQmlEngine *m_qmlEngine;
    QQmlComponent *m_qmlComponent;
    QQuickItem *m_rootItem;
    QOpenGLFramebufferObject *m_fbo;
    QObject *m_currentFocus;
    bool m_quickInitialized;
    bool m_quickReady;
    QTimer m_updateTimer;
    qreal m_dpr;
};

#endif