drm_commit_thread.h

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/*
    KWin - the KDE window manager
    This file is part of the KDE project.
 
    SPDX-FileCopyrightText: 2023 Xaver Hugl <xaver.hugl@gmail.com>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
#pragma once
 
#include <QObject>
#include <QThread>
#include <condition_variable>
#include <mutex>
#include <vector>
 
namespace KWin
{
 
class DrmGpu;
class DrmCommit;
class DrmAtomicCommit;
class DrmLegacyCommit;
 
using TimePoint = std::chrono::steady_clock::time_point;
 
class DrmCommitThread : public QObject
{
    Q_OBJECT
public:
    explicit DrmCommitThread(DrmGpu *gpu, const QString &name);
    ~DrmCommitThread();
 
    void addCommit(std::unique_ptr<DrmAtomicCommit> &&commit);
    void setPendingCommit(std::unique_ptr<DrmLegacyCommit> &&commit);
 
    void setModeInfo(uint32_t maximum, std::chrono::nanoseconds vblankTime);
    void pageFlipped(std::chrono::nanoseconds timestamp);
    bool pageflipsPending();
    std::chrono::nanoseconds safetyMargin() const;
 
Q_SIGNALS:
    void commitFailed();
 
private:
    void clearDroppedCommits();
    TimePoint estimateNextVblank(TimePoint now) const;
    void optimizeCommits();
 
    std::unique_ptr<DrmCommit> m_committed;
    std::vector<std::unique_ptr<DrmAtomicCommit>> m_commits;
    std::unique_ptr<QThread> m_thread;
    std::mutex m_mutex;
    std::condition_variable m_commitPending;
    TimePoint m_lastPageflip;
    TimePoint m_targetPageflipTime;
    std::chrono::nanoseconds m_minVblankInterval;
    std::vector<std::unique_ptr<DrmAtomicCommit>> m_droppedCommits;
    bool m_vrr = false;
    std::chrono::nanoseconds m_safetyMargin{0};
};
 
}