Problem with Raspberry PI 2 and Raspbian 11 (bullseye)

[mbeckerle-xqueue]

Hi,

I have been last using C++ when I was working at university 15 years ago, since that I had no need and I am really out of the topic. However, I found an interesting Project which uses OpenGL without X and I found this project but I used OpenGL last time when I was still a student (and not over C++), so forgive me if I am missing obvious connections.

I just installed Raspbian 11 (bullseye) and found nothing to work for me. After a lot of trial I got the thing compiled and under the desktop it even rendered a file but not over SSH connection. I tested and read and finally as I was finding mesa all the time, I wondered if I installed that. I just reinstalled the OS and made the following observations:

user@host:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 11 (bullseye)"
NAME="Raspbian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

First thing I found ist, that there is no directory "/opt/vc/lib"

user@host:~ $ ls /opt/
pigpio/      WidevineCdm/

Aparently it has been moved to /usr/lib/arm-linux-gnueabihf/ due to some postings I found and it seems correct. In that folder I see:

user@host:~ $ ls /usr/lib/arm-linux-gnueabihf/libEGL*
/usr/lib/arm-linux-gnueabihf/libEGL_mesa.so.0  /usr/lib/arm-linux-gnueabihf/libEGL_mesa.so.0.0.0  /usr/lib/arm-linux-gnueabihf/libEGL.so.1  /usr/lib/arm-linux-gnueabihf/libEGL.so.1.1.0

However, I read again mesa, which seems not to be working with this project, right?

I also found that in recent versions of Raspbian I need to use
-lGLESv2 instead -lbrcmGLESv2
-lEGL instead -lbrcmEGL

Probably I am heavily messing with libraries in "bullseye" but as I don't know how it is meant to be, can you maybe check what to do under fresh installed Raspbian 11 optimally over SSH as I do not have a monitor connected usually)?

[qwert666]

I've just installed a lite "bullseyes" on a raspberry pi Zero 2 W, as I wanted to try out a setup with displaying OpenGL shaders to a led-matrix display.

After a fresh installed system you'll not have all the required drivers in place, but you can easily build them:

> git clone https://github.com/raspberrypi/userland.git
> cd userland
> sudo ./buildme

after this you'll have all the required and proper libs in place:

> ls /opt/vc/lib
libEGL.so        libGLESv2.so        libWFC.so       libbrcmGLESv2.so  libcontainers.so       libdtovl.so         libkhrn_static.a       libmmal_core.so       libopenmaxil.so  libvcilcs.a  pkgconfig
libEGL_static.a  libGLESv2_static.a  libbcm_host.so  libbrcmOpenVG.so  libdebug_sym.so        libelftoolchain.so  libmmal.so             libmmal_util.so       libvchiq_arm.so  libvcos.so   plugins
libGLESv1_CM.so  libOpenVG.so        libbrcmEGL.so  ...

switching between lbrcmGLESv2 and lGLESv2 doesn't make any difference for me, both works completely fine 🤔

[mbeckerle-xqueue]

Thank you, Michal!
That was the missing link. For anyone reading this: after building userland, the files were available and compiling worked but I got another error:
./triangle: error while loading shared libraries: libbrcmEGL.so: cannot open shared object file: No such file or directory
I missed to set LD_LIBRARY_PATH so to solve it I just had to set:
LD_LIBRARY_PATH=/opt/vc/lib