This disables pretty much every desktop effect, while keeping the compositor semi-enabled. In ~/home//.kde/share/config/kwinrc the use of OpenGl can be forced by adding the following lines to the compositing-section: It's defaulted to OpenGL 2.0 on my machine, but is there any benefit in using OpenGL 3.1? It is designed to target the 3D graphics capabilities of newer video cards. Those three ways are: On the CPU with no help from the GPU using the raster engine; Using X11/Xrender with the X11 engine; Using OpenGL with the OpenGL engine The login hangs were gone after updating to 16.10, so unfortunately I cannot confirm but I am sure it does solve the issue. Some features may be incomplete and it is recommended to use the OpenGL mode if possible. Text is drawn by loading the glyphs into the server and rendering as a group. January, 26th 2011. The porting has a low priority for the core KWin team as the default compositing backend is OpenGL and it is possible to disable building KWin with XRender support. Over the last few months the KWin development team worked on bringing the Window Manager for KDE's Plasma workspaces to mobile devices. [1], The core X Window System drawing protocol does not have a way to efficiently draw transparent objects: A computer display is composed of individual pixels, which can only show a single color at a time. Great hint regarding tearing - for me it already completely went away by switching from XRender to OpenGL 3.1, no other settings were needed :-) – Torsten Römer Jan 22 '17 at 18:31 The porting has a low priority for the core KWin team as the default compositing backend is OpenGL and it is possible to disable building KWin with XRender support. The Compositing type allows choice of the compositing backend, either XRender or OpenGL. Its design was influenced by rio, the windowing system for Plan 9. Learn how and when to remove these template messages, Learn how and when to remove this template message, "Design and Implementation of the X Rendering Extension", High Performance X Servers in the Kdrive Architecture, https://en.wikipedia.org/w/index.php?title=X_Rendering_Extension&oldid=904738614, Articles lacking in-text citations from April 2011, Articles lacking reliable references from April 2011, Articles with multiple maintenance issues, Articles containing potentially dated statements from 2011, All articles containing potentially dated statements, Creative Commons Attribution-ShareAlike License, This page was last edited on 4 July 2019, at 06:02. KWIN_BUILD_ACTIVITIES. XRender доступен даже если драйвер OpenGL не установлен (например, виртуальные машины) и использует в основном центральный процессор для отрисовки. The Plasma Workspaces have seen both polish in existing functionality as well as the introduction of significant new innovations extending Plasma's capabilities further towards a more semantic, task-driven workflow. I'm using the proprietary nvidia driver, if that makes a difference. You'll miss out a few OpenGL desktop window transition effects, but the MASSIVE boost in performance should be well worth it. However, the standard X protocol only allows drawing with solid color, so the only way to achieve transparency is to fetch the background color from the screen, mix it with the object color, then write it back, which is fairly inefficient.[2]. I had a really strange problem on my laptop where KDE / the whole system got very slow after browsing / watching youtube videos. I could try OpenGL compositing but I feel it isn't quite there. The X Rendering Extension (Render or XRender) is an extension to the X11 core protocol to implement image compositing in the X server, to allow an efficient display of transparent images. The specific compositors are implemented as a sub class of the abstract base class KWin::Scene and a few more classes. Builds support for KDE's Activity concept. Hi, by playing around with KDE 4.1 I have switched from OpenGL to XRender by accident. With 3 predominant ways of rendering graphics KWin::Scene and a few desktop... Straining the eyes you are interested in working on one of KWin 's compositing backends is based on XRender,... Bug is there any benefit in using OpenGL 3.1 the eyes to enable the OpenGL-based,... To read text for longer duration without straining the eyes to enable the OpenGL-based pipeline, provides!, mugs, apparel, and more to support KDE like bothering transitions... Users of the XRender compositor would benefit from a port to xcb boot KDE... 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