qsgthreadedrenderloop_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QSGTHREADEDRENDERLOOP_P_H
#define QSGTHREADEDRENDERLOOP_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/QThread>
#include <QtCore/QElapsedTimer>
#include <private/qsgcontext_p.h>
 
#include "qsgrenderloop_p.h"
 
QT_BEGIN_NAMESPACE
 
class QSGRenderThread;
 
class QSGThreadedRenderLoop : public QSGRenderLoop
{
    Q_OBJECT
public:
    QSGThreadedRenderLoop();
    ~QSGThreadedRenderLoop();
 
    void show(QQuickWindow *) override {}
    void hide(QQuickWindow *) override;
    void resize(QQuickWindow *window) override;
 
    void windowDestroyed(QQuickWindow *window) override;
    void exposureChanged(QQuickWindow *window) override;
 
    QImage grab(QQuickWindow *) override;
 
    void update(QQuickWindow *window) override;
    void maybeUpdate(QQuickWindow *window) override;
    void handleUpdateRequest(QQuickWindow *window) override;
 
    QSGContext *sceneGraphContext() const override;
    QSGRenderContext *createRenderContext(QSGContext *) const override;
 
    QAnimationDriver *animationDriver() const override;
 
    void releaseResources(QQuickWindow *window) override;
 
    bool event(QEvent *) override;
    void postJob(QQuickWindow *window, QRunnable *job) override;
 
    bool interleaveIncubation() const override;
 
public Q_SLOTS:
    void animationStarted();
    void animationStopped();
 
private:
    struct Window {
        QQuickWindow *window;
        QSGRenderThread *thread;
        QSurfaceFormat actualWindowFormat;
        QElapsedTimer timeBetweenPolishAndSyncs;
        float psTimeAccumulator;
        int psTimeSampleCount;
        uint updateDuringSync : 1;
        uint forceRenderPass : 1;
        uint badVSync : 1;
    };
 
    friend class QSGRenderThread;
 
 
    Window *windowFor(QQuickWindow *window);
    void releaseResources(Window *window, bool inDestructor);
    bool checkAndResetForceUpdate(QQuickWindow *window);
 
    bool anyoneShowing() const;
    void initialize();
 
    void startOrStopAnimationTimer();
    void postUpdateRequest(Window *w);
    void waitForReleaseComplete();
    void polishAndSync(Window *w, bool inExpose = false);
    void maybeUpdate(Window *window);
 
    void handleExposure(QQuickWindow *w);
    void handleObscurity(Window *w);
    void releaseSwapchain(QQuickWindow *window);
 
    bool eventFilter(QObject *watched, QEvent *event) override;
 
    QSGContext *sg;
    // Set of contexts that have been created but are now owned by
    // a rendering thread yet, as the window has never been exposed.
    mutable QSet<QSGRenderContext*> pendingRenderContexts;
    QAnimationDriver *m_animation_driver;
    QList<Window> m_windows;
 
    int m_animation_timer;
 
    bool m_lockedForSync;
    bool m_inPolish = false;
};
 
QT_END_NAMESPACE
 
#endif // QSGTHREADEDRENDERLOOP_P_H