** Compiling Proton and its examples on the Raspberry Pi with OpenGL 2**

Test with the latest Raspberry Pi OS and RetroPi as of June 9th, 2023.

These should run both in the desktop GUI, or directly from bash. (Fullscreen)  I guess it's all identical to running on Ubuntu Linux/etc these days, no special stuff is needed.

First, install some tools/libs you'll need:

<code bash>
sudo apt-get install cmake zlib1g-dev
sudo apt-get install libsdl2-2.0-0 libsdl2-dev
</code>


Don't forget git!

<code bash>
sudo apt-get install git
</code>

Next, install Proton.

<code bash>
cd ~
git clone https://github.com/SethRobinson/proton.git
</code>

Now let's build Proton's RTPack utility, will come in handle later to build and optimize resources.

<code bash>
cd ~/proton/RTPack/linux
sh linux_compile.sh
</code>

Now let's compile and run RTBareBones:

<code bash>
cd ~/proton/RTBareBones/linux
sh linux_compile.sh
cd ../bin
./RTBareBones
</code>

If that worked, enjoy the spinning triangle and text stretching!  It got 300+ fps on my Pi 4. Starting it from an ssh session worked for me as well.

Now let's do RTSimpleApp, same thing but it needs SDL2_mixer for its audio, so let's get that installed:

<code bash>
sudo apt-get install libsdl2-mixer-dev
</code>

Great.  Now we compile and run like before, but we're adding a step - compiling media with the RTPack utility.

<code bash>
cd ~/RTSimpleApp/linux
sh linux_compile.sh
cd ../media
sh update_media.sh
cd ../bin
./RTSimpleApp
</code>

If that worked, enjoy the app.  If it didn't... off to the forums and yell at Seth!

=== Note from Dec 3rd, 2023 ===

I updated things so pulseaudio is used by default instead of alsa when compiling on a pi, this fixes audio on the latest Raspberry Pi OS.  (in AudioManagerSDL.cpp)

=== State of Proton on the Pi ===
  
Hint: Using the RetroPi dist? You can edit the text file **/opt/retropie/configs/all/autostart.sh** and comment out where it runs emulationstation and change that to run your own app - or nothing at all, so it drops into the shell on boot.

An easy way to replace the boot splash is replacing **/opt/retropie/supplementary/splashscreen/retropie-default.png**