In order to go to Qt 5 KWin needs to be ported from XLib to XCB. With the migration of KWin's codebase to git, the code was imported into the master development tree to be part I notice there is an option under Settings/Display and Monitor/Compositor to change the rendering backend for the desktop effects. One of KWin's compositing backends is based on XRender. XRender mode. I have diabled nearly everything, but still not possible to switch back to OpenGL. Before starting to work on it, it might be a good idea to have a look at the X Rendering Extension Protocol Specification as the API is derived from the protocol description. Nevertheless it should be ported as users of the XRender compositor would benefit from a port to xcb. It appears that WSL doesn't currently have much if any support for hardware acceleration with OpenGL, so you should set your KDE Plasma window compositor to run on the Xrender backend rather than OpenGL 2 or 3.1. Nvidia and AMD cards usually fall into this category, although the AMD/ATI drivers may vary … Hi, by playing around with KDE 4.1 I have switched from OpenGL to XRender by accident. My primary use of compton is to get rid of tearing (I use GTX 560 Ti & Dell U2711). From my experience, graphics cards with good 3D hardware and drivers should always use OpenGL. My primary use of compton is to get rid of tearing (I use GTX 560 Ti & Dell U2711). KWIN_PLASMA_ACTIVE. As soon as I reboot howerver, KDE comes up with no desktop effects. 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. KDE is an open community of friendly people who want to create a world in which everyone has control over their digital life and enjoys freedom and privacy. This document is used to keep track of various parts which need to be ported and to organize an collaborative approach towards the porting. 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. 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 Over the last few months the KWin development team worked on bringing the Window Manager for KDE's Plasma workspaces to mobile devices. I had a really strange problem on my laptop where KDE / the whole system got very slow after browsing / watching youtube videos. This has required porting the compositing code to OpenGL ES 2.0, the open graphics API for programmable embedded graphics hardware. Default: ON (OFF for GLES only builds) Builds OpenGL 1 based compositing support Since 4.10, Removed in 5.0. KWIN_BUILD_ACTIVITIES. The login hangs were gone after updating to 16.10, so unfortunately I cannot confirm but I am sure it does solve the issue. Default: Enabled for KDE_PLATFORM_PROFILE not Desktop KWIN_PLASMA_ACTIVE. XRender is also used in some effects directly and this is actually a good task to work on as the code areas are small and easy to verify. Writing a single OpenGL application that runs on all platforms is quite difficult, even for simple objects. Builds XRender based compositing support KWIN_BUILD_OPENGL_1_COMPOSITING. Geometric figures are rendered by client-side tessellation into either triangles or trapezoids. The header file is xcb/xcb_renderutil.h. This disables pretty much every desktop effect, while keeping the compositor semi-enabled. Switching the compositor from OpenGL to Xrender stops this from happening. Qt, and therefore KDE, deals with 3 predominant ways of rendering graphics. 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 specific compositors are implemented as a sub class of the abstract base class KWin::Scene and a few more classes. Desktop OpenGL, OpenGL/ES 1.1, and OpenGL/ES 2.0 use different function names, and shaders versus fixed function pipelines. One of KWin's compositing backends is based on XRender. The Activities system has been redesigned making it easier to take advantage of them. Many effects are not available with XRender. 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]. KDE 4.7.1 Changelog : KDE.org Changes in KDE 4.7.1 kdelibs[ all SVN changes ] khtml Bugfixes: Fix konqueror freeze when rendering some tables with zero colspan/rowspan. Builds support for KDE's Activity concept. When I boot with KDE desktop effects Compositing type set to XRender all works. I'm using the proprietary nvidia driver, if that makes a difference. OpenGl fails because of an error or ; it does not enable OpenGl because it detects that the graphics card or the graphics driver is not "safe" to run with OpenGl. OS: KUbuntu 15.04 Graphics: Intel HD 4000 XRender mode in general has less features, at the moment it is also considered unstable since it has not received as much testing as OpenGL mode. This has required porting the compositing code to OpenGL ES 2.0, the open graphics API for programmable embedded graphics hardware. It is nothing quantitative, but when scrolling long pages in Firefox or looking at how desktop behaves when 'fade away' effect is enabled, I feel that OpenGL performance isn't as good as XRender. The specific compositors are implemented as a sub class of the abstract base class KWin::Scene and a few more classes. There is also a render-util library available for which unfortunately the API documentation is lacking. January, 26th 2011. System Settings > Compositor > OpenGL => XRender. 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. I hope I'm reporting this correctly and to the right place. 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. I can even switch to openGl and everything is fine. 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. Purchase books, mugs, apparel, and more to support KDE. By default OpenGL is used which is hardware accelerated. So Qt/3D is an extension to the normal Qt OpenGL module. The Compositing type allows choice of the compositing backend, either XRender or OpenGL. The exact steps are described in this document. It would be nice to have Invert effect for XRender without opengl (where opengl is not working (most GPU)) in KDE. Builds support for KDE's Activity concept. If you are interested in working on one of the parts just add yourself to the specific item. It was written by Keith Packard in 2000 and was first released with XFree86 version 4.0.1. Thus transparency can only be achieved by mixing the colors of the transparent object to be drawn with the background color (alpha compositing). Contrary to what is stated here, I can report much better performance using OpenGL instead of Xrender with Intel HD Graphics on Kubuntu 12.04. 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. Contrary what manual says, for me GLX backend is significantly slower than xrender. Compton does its job perfectly when running compton --config /dev/null --backend xrender --vsync opengl. Contents 1 History Its design was influenced by rio, the windowing system for Plan 9. By right clicking to the window title, you can now make applications and files part o… As an example for implementing a new Compositor this commit can be used. Tearing is caused by Xrender (which is used to composition in Xfwm4), which can't sync (I can't belive that, but it's true). Default: ON. One of KWin's compositing backends is based on XRender. Builds XRender based compositing support KWIN_BUILD_OPENGL_1_COMPOSITING. 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. [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. XRender is available even if no OpenGL driver is installed (e.g. Многие эффекты не доступны с XRender. KDE 4.7.1 Changelog : KDE.org Changes in KDE 4.7.1 kdelibs[ all SVN changes ] khtml Bugfixes: Fix konqueror freeze when rendering some tables with zero colspan/rowspan. Re: KWin compositing only in XRender mode / unable to use OpenGL Sun Nov 29, 2009 8:26 pm Since you are using KDE 4.3, it is likely you have found a bug in the operation of KWin's desktop effects with multiple screens ( probably due to the lack of using Kephal ) KDE is happy to announce the immediate availability of Plasma Desktop and Plasma Netbook 4.6. Thank you so much for pointing this out! Show your love for KDE! It is because KDE (plasma) falls back to Xrender if . I don't feel like bothering with transitions today, so find your own way from beards and dwarfs to Qt/KDE graphics. This page was last edited on 23 December 2012, at 17:44. As an example for implementing a new Compositor this commit can be used. Compton does its job perfectly when running compton --config /dev/null --backend xrender --vsync opengl. Default: ON (OFF for GLES only builds) Builds OpenGL 1 based compositing support Since 4.10, Removed in 5.0. Flickering stops when I change Compositor Rendering Back-end To OpenGL 3 and then change again to OpenGL 2. XRender; OpenGL 1; OpenGL (ES) 2; with OpenGL 1 and 2 sharing a lot of code. Intended use: To enable the OpenGL-based pipeline, which provides hardware acceleration. Default: Enabled for KDE_PLATFORM_PROFILE not Desktop I'm using XFCE 4.10 on Arch Linux (3.14.4) with Nvidia drivers (337.19). System Properties for All Platforms opengl. With the migration of KWin's codebase to git, the code was imported into the master development tree to be part 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. When I try to switch back to OpenGL it says alwaysthat it is not possible, because of the Desptop effects. I can only enable them by setting composition type to XRender and I can not set them to openGl. KDE is happy to announce the immediate availability of Plasma Desktop and Plasma Netbook 4.6. When using Anydesk to connect to my home computer running Arch Linux I experience severe graphical glitches (flickering) when I remote in. Since many operations require transparency (for example spatial anti-aliasing, especially during font rasterization, and transparency effects in window managers, such as transparent windows or menus), this limitation caused problems, and Xrender was implemented to address it. As of 2011[update] it serves primarily to implement antialiased fonts, but for example KWin, KDE’s window manager uses it to draw drop shadows and translucency in case OpenGL is not available. There are two choices here: OpenGL (3D) and XRender (2D). The bug is there for years - tearning video, tearning windows, and so on. I'm using XFCE 4.10 on Arch Linux (3.14.4) with Nvidia drivers (337.19). 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 KDE is an open community of friendly people who want to create a world in which everyone has control over their digital life and enjoys freedom and privacy. The invert Effect is a real useful effect because it helps one to read text for longer duration without straining the eyes. Although it's technically not needed to port everything, we want to port all of KWin over to XCB as XCB has many advantages over XLib, most important that it is an async API. It appears that WSL doesn't currently have much if any support for hardware acceleration with OpenGL, so you should set your KDE Plasma window compositor to run on the Xrender backend rather than OpenGL 2 or 3.1. Does anybody has a idea where to look (e.g. XRender доступен даже если драйвер OpenGL не установлен (например, виртуальные машины) и использует в основном центральный процессор для отрисовки. XRender; OpenGL 1; OpenGL (ES) 2; with OpenGL 1 and 2 sharing a lot of code. XRender. I am facing flickering in KDE Plasma 5.4. It is possible to use XRender for compositing instead of the default OpenGL. You'll miss out a few OpenGL desktop window transition effects, but the MASSIVE boost in performance should be well worth it. Default: ON. Nevertheless it should be ported as users of the XRender compositor would benefit from a port to xcb. Content is available under, X Rendering Extension Protocol Specification, https://community.kde.org/index.php?title=KWin/Xcb&oldid=28609, Note: in Qt 5 a QPixmap does no longer reference an X11 Pixmap. Over the last few months the KWin development team worked on bringing the Window Manager for KDE's Plasma workspaces to mobile devices. Some features may be incomplete and it is recommended to use the OpenGL mode if possible. It is designed to target the 3D graphics capabilities of newer video cards. The exact steps are described in this document. KWIN_BUILD_ACTIVITIES. virtual machines) and uses mostly the CPU for rendering. It's defaulted to OpenGL 2.0 on my machine, but is there any benefit in using OpenGL 3.1? You'll miss out a few OpenGL desktop window transition effects, but the MASSIVE boost in performance should be well worth it. Text is drawn by loading the glyphs into the server and rendering as a group. In ~/home//.kde/share/config/kwinrc the use of OpenGl can be forced by adding the following lines to the compositing-section: Nevertheless it should be ported as users of the XRender compositor would benefit from a port to xcb. Solution is to fix Xrender, or teach Xfwm4 to use OpenGL, or use Compiz. It provides several rendering operations and also does alpha blending. 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Use the OpenGL mode if possible the API documentation is lacking to target 3D... 337.19 ) 23 December 2012, at 17:44 flickering stops when I remote in you interested! 4.10 on Arch Linux ( 3.14.4 ) with Nvidia drivers ( 337.19 ) for programmable embedded graphics hardware you... The specific compositors are implemented as a group OpenGL driver is installed ( e.g XRender would...
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