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Dispmanx elements are like hardware overlays. Assign one weston_surface to each overlay created, and the VideoCore will composite it on screen. The maximum number of elements is configurable via the command line. Specifying zero will disable the overlays (planes/elements) altogether, and use only GLESv2 compositing. You need an up-to-date Raspberry Pi firmware for: - vc_dispmanx_resource_create(), that will also take stride. Otherwise surfaces ending up in elements may show up as corrupted. - off-line compositing support. The on-line compositing of elements cannot handle too many elements. Look for the comments around DEFAULT_MAX_PLANES in the code. Elements must be double-buffered to avoid tearing. Therefore two buffers (Dispmanx resources) are allocated for each element. A command line option is added to allow single-buffering instead to save memory, with the risk of tearing. The page flip timer is replaced with the Dispmanx update completion callback. The callback is executed in a separate thread, therefore a pipe is set up to integrate properly with Weston core. If not disabled, usually all surfaces are assigned into planes, and nothing is composited in GLESv2. Planes do not support surface transformations though, so compositing will automatically switch the necessary surfaces to GLESv2 compositing as needed. Switching between GLESv2 and elements may cause transient visual glitches and jerks. Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com> |
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| clients | ||
| data | ||
| man | ||
| protocol | ||
| shared | ||
| src | ||
| tests | ||
| wcap | ||
| .gitignore | ||
| autogen.sh | ||
| configure.ac | ||
| COPYING | ||
| Makefile.am | ||
| notes.txt | ||
| README | ||
| weston.ini | ||
Weston Weston is the reference implementation of a Wayland compositor, and a useful compositor in its own right. Weston has various backends that lets it run on Linux kernel modesetting and evdev input as well as under X11. Weston ships with a few example clients, from simple clients that demonstrate certain aspects of the protocol to more complete clients and a simplistic toolkit. There is also a quite capable terminal emulator (weston-terminal) and an toy/example desktop shell. Finally, weston also provides integration with the Xorg server and can pull X clients into the Wayland desktop and act as a X window manager. Refer to http://wayland.freedesktop.org/building.html for buiding weston and its dependencies.