File indexing completed on 2024-02-18 16:20:24

0001 /*
0002     SPDX-FileCopyrightText: 2014 Fredrik Höglund <fredrik@kde.org>
0003 
0004     SPDX-License-Identifier: GPL-2.0-or-later
0005 */
0006 
0007 #pragma once
0008 
0009 #include "kwinglutils.h"
0010 
0011 #include <xcb/sync.h>
0012 #include <xcb/xcb.h>
0013 
0014 namespace KWin
0015 {
0016 
0017 /**
0018  * SyncObject represents a fence used to synchronize operations in the kwin command stream
0019  * with operations in the X command stream.
0020  */
0021 class X11SyncObject
0022 {
0023 public:
0024     enum State {
0025         Ready,
0026         TriggerSent,
0027         Waiting,
0028         Done,
0029         Resetting,
0030     };
0031 
0032     X11SyncObject();
0033     ~X11SyncObject();
0034 
0035     State state() const
0036     {
0037         return m_state;
0038     }
0039 
0040     void trigger();
0041     void wait();
0042     bool finish();
0043     void reset();
0044     void finishResetting();
0045 
0046 private:
0047     State m_state;
0048     GLsync m_sync;
0049     xcb_sync_fence_t m_fence;
0050     xcb_get_input_focus_cookie_t m_reset_cookie;
0051 };
0052 
0053 /**
0054  * SyncManager manages a set of fences used for explicit synchronization with the X command
0055  * stream.
0056  */
0057 class X11SyncManager
0058 {
0059 public:
0060     enum {
0061         MaxFences = 4,
0062     };
0063 
0064     static X11SyncManager *create();
0065     ~X11SyncManager();
0066 
0067     bool endFrame();
0068 
0069     void triggerFence();
0070     void insertWait();
0071 
0072 private:
0073     X11SyncManager();
0074 
0075     X11SyncObject *m_currentFence = nullptr;
0076     QVector<X11SyncObject *> m_fences;
0077     int m_next = 0;
0078 };
0079 
0080 } // namespace KWin