Public bug reported:
If the --enable-osmesa in the mesa configuration were replaced with
--enable-gallium-osmesa, then the OSMesaCreateContextAttribs would be
able to return OpenGL core contexts. To show this I'm attaching a
modified version of mesa-demos-8.4.0/src/osdemos/osdemo.c (from
ftp://ftp.freedesktop.org/pub/mesa/demos/mesa-demos-8.4.0.tar.gz). The
modified code is all within the #ifdef USE_CORE_CONTEXT. To compile it,
do "gcc osdemo.c -lGLU -lOSMesa -lm". With the libOSMesa.so.8 from
Ubuntu 18.04, it fails with "OSMesaCreateContext failed!". But with a
libOSmesa.so from a mesa that is configured with --enable-galliums-
osmesa instead of --enable-osmesa, it works!
Also note that libOSMesa.so on Ubuntu 18.04 only supports OpenGL 2.1.
While --enable-gallium-osmesa gets it up to OpenGL 3.3. My testing was
with mesa 17.3.9 and mesa 18.2.5.
** Affects: mesa (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1803681
Title:
osmesa doesn't suport core contexts but could
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