[Mesa-users] Mesa 18.3 swrast

[Michael Saunders]

We have successfully used Mesa in our visualization product for many years
as a great workaround for customers who experience hardware rendering
problems as well as for offscreen rendering. We are upgrading to Mesa 18
and ran into rendering issues that I haven't been able to track down online.

I built Mesa libGL.so.1 on a CentOS 6 platform (we are required to build on
the oldest platform that we support) but when used on a number of CentOS 7
platforms we experience rending problems. Some of these target machines
have native NVidia drivers installed and others have the default Linux
drivers backed by Mesa. Running glxgears using the Mesa libGL.so.1 that I
built consistently renders areas colored using glClear or areas rendered
using alpha blending allow live window contents from behind the drawing
area to bleed through. When I move the GL drawing area around or if the
underlying window contents change it changes my OpenGL drawing area that is
in the Window above them. Is this a known issue and is there a
configuration setting that I need to set to avoid it?

Options used to build Mesa libGL.so.1:
./configure \
    --with-gallium-drivers=swrast \
    --with-platforms=x11 \
    --enable-llvm \
    --disable-dri \
    --disable-egl \
    --disable-gbm \
    --disable-gles1 \
    --disable-gles2

Any insight that you might have would be appreciated.

Thanks,
Michael

Note bleed through from underlying window with a simple OpenGL application
like glxgears using Mesa libGL.so.1
[image: Screenshot1.png]

The same problem is demonstrated in our OpenGL product using Mesa libGL.so.1
[image: Screenshot2.png]
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