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.
99 lines
2.8 KiB
C++
99 lines
2.8 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: 2012 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_EGL_ON_X_BACKEND_H
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#define KWIN_EGL_ON_X_BACKEND_H
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#include "abstract_egl_backend.h"
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#include "swap_profiler.h"
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#include <xcb/xcb.h>
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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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/**
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* @brief OpenGL Backend using Egl windowing system over an X overlay window.
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*/
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class KWIN_EXPORT EglOnXBackend : public AbstractEglBackend
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{
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public:
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EglOnXBackend(Display *display);
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explicit EglOnXBackend(xcb_connection_t *connection, Display *display, xcb_window_t rootWindow, int screenNumber, xcb_window_t renderingWindow);
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~EglOnXBackend() override;
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void screenGeometryChanged(const QSize &size) override;
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SceneOpenGLTexturePrivate *createBackendTexture(SceneOpenGLTexture *texture) override;
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QRegion beginFrame(int screenId) override;
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void endFrame(int screenId, const QRegion &damage, const QRegion &damagedRegion) override;
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OverlayWindow* overlayWindow() const override;
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bool usesOverlayWindow() const override;
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void init() override;
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bool isX11TextureFromPixmapSupported() const {
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return m_x11TextureFromPixmapSupported;
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}
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protected:
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void presentSurface(EGLSurface surface, const QRegion &damage, const QRect &screenGeometry);
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virtual bool createSurfaces();
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EGLSurface createSurface(xcb_window_t window);
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void setHavePlatformBase(bool have) {
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m_havePlatformBase = have;
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}
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bool havePlatformBase() const {
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return m_havePlatformBase;
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}
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bool makeContextCurrent(const EGLSurface &surface);
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void setX11TextureFromPixmapSupported(bool set) {
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m_x11TextureFromPixmapSupported = set;
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}
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private:
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bool initBufferConfigs();
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bool initRenderingContext();
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/**
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* @brief The OverlayWindow used by this Backend.
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*/
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OverlayWindow *m_overlayWindow;
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int surfaceHasSubPost;
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int m_bufferAge;
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bool m_usesOverlayWindow;
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xcb_connection_t *m_connection;
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Display *m_x11Display;
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xcb_window_t m_rootWindow;
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int m_x11ScreenNumber;
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xcb_window_t m_renderingWindow = XCB_WINDOW_NONE;
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bool m_havePlatformBase = false;
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bool m_x11TextureFromPixmapSupported = true;
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SwapProfiler m_swapProfiler;
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friend class EglTexture;
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};
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/**
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* @brief Texture using an EGLImageKHR.
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*/
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class EglTexture : public AbstractEglTexture
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{
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public:
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~EglTexture() override;
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void onDamage() override;
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bool loadTexture(WindowPixmap *pixmap) override;
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private:
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bool loadTexture(xcb_pixmap_t pix, const QSize &size);
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friend class EglOnXBackend;
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EglTexture(SceneOpenGLTexture *texture, EglOnXBackend *backend);
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EglOnXBackend *m_backend;
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};
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} // namespace
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#endif // KWIN_EGL_ON_X_BACKEND_H
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