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** Setting up Raspbery Pi to compile Proton SDK examples in X11 via SDL2 and the OpenGL experimental driver **

These steps are what I use to compile stuff by copying things from my Windows computer.  A normal user would probably just grab the svn tree and run .sh files.

  * Give the video card more memory on the pi.  Run raspi-config and give it 128 or 256 (good for the pi3)
  * Also enable the experimental OpenGL driver under the Advanced section in raspi-config
  * Install cmake on the pi (sudo apt-get install cmake)
  * Do "sudo rpi-update" to make sure your firmware is updated
  * Run the following from a shell:

<code>
sudo apt-get -y install xcompmgr libgl1-mesa-dri && sudo apt-get -y install libalut0 libalut-dev && sudo apt-get -y install mesa-utils

sudo apt-get install libglu1-mesa-dev freeglut3-dev mesa-common-dev
</code>

  * Do the following from a shell window to install SDL2 from source:

<code>
cd ~ 
wget https://www.libsdl.org/release/SDL2-2.0.4.tar.gz 
tar zxvf SDL2-2.0.4.tar.gz 
cd SDL2-2.0.4 && mkdir build && cd build 
../configure --disable-pulseaudio --disable-esd --disable-video-mir --disable-video-wayland
make -j 5 
sudo make install 
</code>

  * To test, type "glxgears" from a shell inside of the GUI desktop


Step 2: Proton stuff

  * Install linux tools for Windows, rsync and ssh should work from the command line
  * Setup a ssh key pair so you don't have to type passwords
  * Edit SetupVars.bat and edit the IP to the pi
  * Run CopyStuffToPi.bat.  There should now be a ~/proton tree on the pi
  * Edit the RTBareBones/linux/CMakeLists.txt file and make sure "OPTION(RASPBERRYPI_OPENGL "Compile for Raspi 3 OpenGL" ON)" is uncommented 
  * RTBareBones/CopyStuffToPiAndCompileLoop.bat and it should update that example and compile it in a loop

The last step of the build copies the rtbarebones binary to /RTBareBones/bin (as that's where the media is), so go to that dir and run "./rtbarebones" and it should work.