libosmesa6-dev_bug_fix

Here is almost a copy/paste of the instruction written by Quentin Magdelaine that you can find here to fix off-screen rendering bug using OSMesa after the recent libosmesa update on Debian10.1/19.0.2-1ubuntu1.1~18.04.1 distribution.

Instructions. First, remove the new OSmesa library which does not work:

sudo apt remove libosmesa6-dev

Then download an older version:

wget mesa3d.org/archive/mesa-18.2.8.tar.gz

Then decompress it (change [username] for yours (ex: toto)):

tar -zxvf mesa-18.2.8.tar.gz
cd mesa-18.2.8
./configure --prefix=/home/[username]/local --enable-osmesa \
            --with-gallium-drivers=swrast                \
            --disable-driglx-direct --disable-dri --disable-gbm --disable-egl

If it doesn’t find zlib, install zlib1g-dev with:

    sudo apt install zlib1g-dev

Try again. If it still doesn’t work instak pkg-config:

sudo apt install pkg-config

and try again, it should work.

Compile the library:

make

(This step is quite long.) And install it:

make install

The library is not installed in the standard path (/usr/lib/), so you need to tell gcc and basilisk about it. First, enter in your terminal:

export LD_LIBRARY_PATH=/home/[username]/local/lib:$LD_LIBRARY_PATH

and, to not have to do it again as soon as you open a new terminal:

echo "export LD_LIBRARY_PATH=/home/[username]/local/lib:$LD_LIBRARY_PATH" >> ~/.bashrc

Then in the config file in basilisk/src/, change the line

OPENGLIBS = -lfb_osmesa -lGLU -lOSMesa
for
OPENGLIBS = -L/home/[username]/local/lib -lfb_osmesa -lGLU -lOSMesa

And in fb_osmesa.c in basilisk/src/gl/, change the line

#include <GL/osmesa.h>
for
#include </home/[username]/local/include/GL/osmesa.h>

You can now compile the libraries provided by basilisk in basilisk/src/gl:

make libglutils.a libfb_osmesa.a

and the bview-servers in basilisk/src/:

make bview-servers

You should be able to compile and run successfully all your codes using the standar Makefile of Basilisk. Here is a test of the Bview functionnalities.

cp $BASILISK/test/view.c .
make view.tst

Or if you do not use makefile, you have to use the following compilation line:

qcc view.c -lm -L/home/[username]/local/lib/ -L$BASILISK/gl/ -lOSMesa -lglutils -lfb_osmesa -lGLU

Note that you may experienced some trouble to play with vlc .mp4 videos generated with this fix. A quick fix to this is to use cvlc.