0ceff5fd24
The compositing timing algorithm assumes that glXSwapBuffers() and eglSwapBuffers() block. While this was true long time ago with NVIDIA drivers, nowadays, it's not the case. The NVIDIA driver queues several buffers in advance and if the application runs out of them, it will block. With Mesa driver, swapping buffer was never blocking. This change makes the render backends swap buffers right after ending a compositing cycle. This may potentially block, but it shouldn't be an issue with modern drivers. In case it gets proven, we can move glXSwapBuffers() and eglSwapBuffers() in a separate thread. Note that this change breaks the compositing timing algorithm, but it's already sort of broken with Mesa drivers.
42 lines
981 B
C++
42 lines
981 B
C++
/*
|
|
KWin - the KDE window manager
|
|
This file is part of the KDE project.
|
|
|
|
SPDX-FileCopyrightText: 2015 Martin Gräßlin <mgraesslin@kde.org>
|
|
|
|
SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
#ifndef KWIN_EGL_X11_BACKEND_H
|
|
#define KWIN_EGL_X11_BACKEND_H
|
|
#include "eglonxbackend.h"
|
|
|
|
namespace KWin
|
|
{
|
|
|
|
class X11WindowedBackend;
|
|
|
|
/**
|
|
* @brief OpenGL Backend using Egl windowing system over an X overlay window.
|
|
*/
|
|
class EglX11Backend : public EglOnXBackend
|
|
{
|
|
public:
|
|
explicit EglX11Backend(X11WindowedBackend *backend);
|
|
~EglX11Backend() override;
|
|
bool usesOverlayWindow() const override;
|
|
QRegion beginFrame(int screenId) override;
|
|
void endFrame(int screenId, const QRegion &damage, const QRegion &damagedRegion) override;
|
|
|
|
protected:
|
|
void cleanupSurfaces() override;
|
|
bool createSurfaces() override;
|
|
|
|
private:
|
|
void setupViewport(int screenId);
|
|
QVector<EGLSurface> m_surfaces;
|
|
X11WindowedBackend *m_backend;
|
|
};
|
|
|
|
} // namespace
|
|
|
|
#endif
|