47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
|
/*
|
||
|
|
SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
|
||
|
|
|
||
|
|
SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
*/
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include "vsyncmonitor.h"
|
||
|
|
|
||
|
|
#include <QTimer>
|
||
|
|
|
||
|
|
namespace KWin
|
||
|
|
{
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The SoftwareVsyncMonitor class provides synthetic vblank events with constant interval.
|
||
|
|
*
|
||
|
|
* The software vsync monitor can never fail and it is always available. It can be used as
|
||
|
|
* fallback if hardware based approaches to monitor vsync events are unavailable.
|
||
|
|
*
|
||
|
|
* The vblank interval can be changed by calling the setRefreshRate() function.
|
||
|
|
*/
|
||
|
|
class KWIN_EXPORT SoftwareVsyncMonitor : public VsyncMonitor
|
||
|
|
{
|
||
|
|
Q_OBJECT
|
||
|
|
|
||
|
|
public:
|
||
|
|
static SoftwareVsyncMonitor *create(QObject *parent);
|
||
|
|
|
||
|
|
int refreshRate() const;
|
||
|
|
void setRefreshRate(int refreshRate);
|
||
|
|
|
||
|
|
public Q_SLOTS:
|
||
|
|
void arm() override;
|
||
|
|
|
||
|
|
private:
|
||
|
|
explicit SoftwareVsyncMonitor(QObject *parent = nullptr);
|
||
|
|
void handleSyntheticVsync();
|
||
|
|
|
||
|
|
QTimer *m_softwareClock = nullptr;
|
||
|
|
int m_refreshRate = 60000;
|
||
|
|
std::chrono::nanoseconds m_vblankTimestamp = std::chrono::nanoseconds::zero();
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace KWin
|