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Bridge Command for the Pi 3 : Pi 4 is recommended


Download here https://github.com/vpelss/BridgeCommand_for_Pi-3

https://github.com/vpelss/BridgeCommand_for_Pi-3 is a fork from https://github.com/bridgecommand/bc
The modifications in this fork are intended to allow you to run and compile bridgecommand on the Raspberry Pi 3.

Differences:
– Binaries (when done) will be ready for the Pi 3 Raspbian
– Height maps in the World folder are 256×256, to prevent invisible land masses due to graphic driver limitations
– ini file settings are set to lower perfomance so bridgecommand will work on the Pi 3

The Pi 3 and Raspbian have the ability to use GL drivers. The Pi 3 only has 1 GB of RAM, which limits the possible size of textures, etc.

Things I like to set up on Raspbian first:
-A large swap file. Mine is 2 GB. https://www.bitpi.co/2015/02/11/how-to-change-raspberry-pis-swapfile-si….
-If using a USB device to boot from: “dtoverlay=sdtweak,poll_once” in config.txt. See: https://github.com/raspberrypi/linux/issues/2567
-logs to ram, not SD card, or turn logs off: https://raspberrypi.stackexchange.com/questions/62533/how-can-i-reduce-…

Things you must set up:
-Use a high quality sd card or ssd drive. Perfomance is drastically affected by storage media. https://www.raspberrypi.org/documentation/installation/sd-cards.md
-Ensure Raspbian is up to date:
sudo apt-get update
sudo apt-get dist-upgrade
-Enable opengl in Raspbian:
Run: raspi-config
choose ‘7 – advanced’ then ‘A7 GL Driver’ then ‘G2 – GL Fake KMS’
Reboot
-For sound, we must type this in a terminal:
export PA_ALSA_PLUGHW=1 (or we get the following error: Pa_OpenDefaultStream failed. Segmentation fault)
You can set it permanently by: sudo nano /etc/enviornment
Then adding: PA_ALSA_PLUGHW=1
to the last line then saving. Then reboot.

Running tips:
– Run bridgecommand-ini first
– set ‘water_segments’. Set it to 8 or lower. The processing power required for the wave motion is just too much for the Raspberry Pi. To fix this I changed the setting in MovingWater.cpp. I changed ‘segments = 32’ to ‘segments=8’. This is on line 86. Mr. Packer wrote this setting into his code. I haven’t had a crash or a freeze on the Pi since this setting was available and set appropriately.
– Turn off Shading
– set width and height to: 800×600 or less 640×480 and start in windowed mode. It will not work well at higher resolutions.
– set ‘use_directx’ to 0
– Run bridgecommand-bc alone. It often freezes the gui when the browser or other memory intense programs are open.
– Boot off a fast SD card, not a USB stick unless it is very fast. I use an external, low power, 60 GB SSD and it is very fast.
– Use IP addresses, not the pc network name, on the Pi for repeater and network settings.

————–

Compiling with Raspbian:

– Download source code from:
https://github.com/bridgecommand/bc
Extract to your desktop. This will be reffered to as below.

– Install required libraries:
sudo apt-get install mesa-common-dev libxxf86vm-dev freeglut3-dev libxext-dev libxcursor-dev
(if sound is required)
sudo apt install libsndfile1 libportaudio2 libportaudiocpp0 libsndfile1-dev portaudio19-dev libasound2-dev

Instructions to compile the sound library files are in CompilingLinuxAndMac.txt, they do not work with the Raspbian OS.
The following are ways I have built Bridgecommand with sound in Raspbian.
If you don’t need sound, jump down to ‘Compiling without sound:’

1. The easiest way is to add sound is to compile Bridgecommand using pre-installed system SHARED libraries we installed earlier.
sudo apt install libsndfile1 libportaudio2 libportaudiocp0 libsndfile1-dev portaudio19-dev libasound2-dev
Jump down to ‘Compiling with sound:’

2. If you need to have a version with STATIC sound libraries built in to the image, do the following.
Make sure there are no installed sound libraries already.
sudo apt remove libsndfile1 libportaudio2 libportaudiocpp0 libsndfile1-dev portaudio19-dev
(you may want to install afterwards as other programs may use these libraries)

Get source from: (clone)
https://github.com/erikd/libsndfile
as per instructions:
./autogen.sh
./configure –enable-werror
sudo make
sudo make check

Alternately you can install and use cmake:
sudo apt install cmake
cmake
sudo make

Then find and copy libsndfile.a over to /home/pi/Desktop/bc-master/libs/libsndfile/lib

Get source from:
https://app.assembla.com/spaces/portaudio/git/source (see clone)
cmake ./
sudo make
sudo make install
copy libportaudio.a only from /usr/local/lib to /home/pi/Desktop/bc-master/libs/portaudio/lib

Jump down to ‘Compiling with sound:’

3. Instead of downloading and compiling the libsndfile.a and libportaudio.a, I copy them from the apt installs we did earlier.
sudo apt install libsndfile1 libportaudio2 libportaudiocpp0 libsndfile1-dev portaudio19-d libsndfile.a and libportaudio.aev libasound2-dev
The libsndfile.a and libportaudio.a files are in ‘ /usr/lib/arm-linux-gnueabihf/’ and you can copy them to /libs/libsndfile/ and /libs/portaudio/lib/
Now remove those two sound libraries so that the shared libraries are not the ones linked to.
sudo apt remove libsndfile1 libportaudio2 libportaudiocpp0 libsndfile1-dev portaudio19-dev
Add the following to the USERLDFLAGS in MakefileWithSound
-lFLAC
-logg
-ljack
-lvorbis
-lvorbisenc

Compiling with sound:
Start from a clean build: “make -f MakefileWithSound clean”.
In a terminal at type ‘make -f MakefileWithSound’

Compiling without sound:
Start from a clean build: “make clean”.
In a terminal at type ‘make’

——————-

Compiling with CMAKE with sound:

sudo apt install portaudio19-dev libsndfile1-dev libasound2-dev

We must type this in a terminal::
export PA_ALSA_PLUGHW=1
or we get:
Pa_OpenDefaultStream failed.
Segmentation fault

In CmakeLists.txt
add:
set(CMAKE_CXX_FLAGS “-DWITH_SOUND”)

Add in target_link_libraries(bridgecommand-bc PRIVATE :
-lsndfile
-lportaudio
-lasound

#(this goes in every CmakeLists.txt that fails with thread errors)
-lpthread

Install cmake:
Sudo apt install cmake

Then run the following in a terminal at :
Cmake ./
Make

—————

Compile Bridgecommand for the Raspberry Pi 3 (using Gentoo Linux 64 OS):

Gentoo Linux can be downloaded here: https://github.com/sakaki-/gentoo-on-rpi-64bit
edit bc-master/libs/Irrlicht/irrlicht-svn/source/Irrlicht/libpng/pngpriv.h and change:
define PNG_FILTER_OPTIMIZATIONS
to
define NO_PNG_FILTER_OPTIMIZATIONS
then run ‘make’

——————————————————

Additional tools: https://github.com/vpelss/BridgeCommand_NEMA_UDP_to_File_HTML

————-

Note: These libraries are installed by default on Raspbian
libsndfile1-1.0.28-6
libportaudio2-19.6.0-1
libasound2-1.1.8+1
libasound2-data-1.1.8
to re-add them
sudo apt install libsndfile1 libportaudio2 libasound2-dev libasound2-data

.so share
.a archive
note: dev lib are required to link against .so files plus provide headers

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