b8a70e62d5
At the moment, our frame scheduling infrastructure is still heavily based on Xinerama-style rendering. Specifically, we assume that painting is driven by a single timer, etc. This change introduces a new type - RenderLoop. Its main purpose is to drive compositing on a specific output, or in case of X11, on the overlay window. With RenderLoop, compositing is synchronized to vblank events. It exposes the last and the next estimated presentation timestamp. The expected presentation timestamp can be used by effects to ensure that animations are synchronized with the upcoming vblank event. On Wayland, every outputs has its own render loop. On X11, per screen rendering is not possible, therefore the platform exposes the render loop for the overlay window. Ideally, the Scene has to expose the RenderLoop, but as the first step towards better compositing scheduling it's good as is for the time being. The RenderLoop tries to minimize the latency by delaying compositing as close as possible to the next vblank event. One tricky thing about it is that if compositing is too close to the next vblank event, animations may become a little bit choppy. However, increasing the latency reduces the choppiness. Given that, there is no any "silver bullet" solution for the choppiness issue, a new option has been added in the Compositing KCM to specify the amount of latency. By default, it's "Medium," but if a user is not satisfied with the upstream default, they can tweak it.
108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 2016 Martin Gräßlin <mgraesslin@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef KWIN_X11_PLATFORM_H
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#define KWIN_X11_PLATFORM_H
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#include "platform.h"
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#include <kwin_export.h>
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#include <QObject>
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#include <memory>
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#include <X11/Xlib-xcb.h>
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#include <fixx11h.h>
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namespace KWin
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{
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class XInputIntegration;
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class WindowSelector;
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class X11EventFilter;
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class X11Output;
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class KWIN_EXPORT X11StandalonePlatform : public Platform
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{
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Q_OBJECT
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Q_INTERFACES(KWin::Platform)
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Q_PLUGIN_METADATA(IID "org.kde.kwin.Platform" FILE "x11.json")
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public:
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X11StandalonePlatform(QObject *parent = nullptr);
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~X11StandalonePlatform() override;
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void init() override;
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OpenGLBackend *createOpenGLBackend() override;
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#ifdef KWIN_HAVE_XRENDER_COMPOSITING
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XRenderBackend *createXRenderBackend() override;
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#endif
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Edge *createScreenEdge(ScreenEdges *parent) override;
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void createPlatformCursor(QObject *parent = nullptr) override;
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bool requiresCompositing() const override;
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bool compositingPossible() const override;
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QString compositingNotPossibleReason() const override;
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bool openGLCompositingIsBroken() const override;
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void createOpenGLSafePoint(OpenGLSafePoint safePoint) override;
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void startInteractiveWindowSelection(std::function<void (KWin::Toplevel *)> callback, const QByteArray &cursorName = QByteArray()) override;
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void startInteractivePositionSelection(std::function<void (const QPoint &)> callback) override;
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PlatformCursorImage cursorImage() const override;
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void setupActionForGlobalAccel(QAction *action) override;
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OverlayWindow *createOverlayWindow() override;
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OutlineVisual *createOutline(Outline *outline) override;
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Decoration::Renderer *createDecorationRenderer(Decoration::DecoratedClientImpl *client) override;
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void invertScreen() override;
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void createEffectsHandler(Compositor *compositor, Scene *scene) override;
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QVector<CompositingType> supportedCompositors() const override;
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void initOutputs();
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void scheduleUpdateOutputs();
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void updateOutputs();
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RenderLoop *renderLoop() const override;
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Outputs outputs() const override;
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Outputs enabledOutputs() const override;
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protected:
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void doHideCursor() override;
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void doShowCursor() override;
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private:
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/**
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* Tests whether GLX is supported and returns @c true
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* in case KWin is compiled with OpenGL support and GLX
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* is available.
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*
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* If KWin is compiled with OpenGL ES or without OpenGL at
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* all, @c false is returned.
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* @returns @c true if GLX is available, @c false otherwise and if not build with OpenGL support.
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*/
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static bool hasGlx();
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template <typename T>
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void doUpdateOutputs();
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void updateRefreshRate();
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XInputIntegration *m_xinputIntegration = nullptr;
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QThread *m_openGLFreezeProtectionThread = nullptr;
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QTimer *m_openGLFreezeProtection = nullptr;
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QTimer *m_updateOutputsTimer = nullptr;
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Display *m_x11Display;
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QScopedPointer<WindowSelector> m_windowSelector;
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QScopedPointer<X11EventFilter> m_screenEdgesFilter;
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QScopedPointer<X11EventFilter> m_randrEventFilter;
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RenderLoop *m_renderLoop;
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QVector<AbstractOutput *> m_outputs;
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};
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}
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#endif
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