OpenGL is properly working if there is a direct rendering context.
If LIBGL_ALWAYS_INDIRECT is set VirtualBox falls back to Mesa's software
rasterizer. So in order to get OpenGL the driver is now whitelisted in
the opengltest.
GLPlatform is extended to recognize the VirtualBox driver and has new
methods to report whether it is a virtual machine and VirtualBox. The
detection is rather limited as we don't get access to the underlying
hardware, so we do not know whether the features are really supported.
We need to trust the driver here in announcing the right extensions.
The driver does not provide glxQueryDrawable although it is part of
GLX 1.3. A hack is added in the glxbackend to set the function pointer to
NULL. This can unfortunately not be done in glxResolveFunctions() as
QueryDrawable seems not to be provided by an extension (at least not
listed in the OpenGL registry) and getProcAddress resolves a function but
it only prints an OpenGL Warning to stderr.
As a note: the driver reports that it is using XSHM for
GLX_EXT_texture_from_pixmap.
REVIEW: 106821
As KWin requires at least Mesa 7.10 for OpenGL we can be sure
that all Mesa drivers support DRI2 and can enable direct rendering
for it.
Parsing the version string to identify if it is a mesa driver.
This can cause breakage again in future versions of Mesa.
Unfortunately version, vendor and renderer are the only information
queryable just with OpenGL API.
BUG: 270942
FIXED-IN: 4.7.0
use direct rendering.
- Move the LIBGL_ALWAYS_INDIRECT code to CompositingPrefs::detect(), and use
the external helper program to determine if the variable needs to be set.
svn path=/trunk/KDE/kdebase/workspace/; revision=1096554
Martin Gräßlin