Ren'Py has limited support for running on the Raspberry Pi. It's been demonstrated to run on the Raspberry Pi 3B, but may run on other models.
It's important to realize that the Raspberry Pi is a very limited system, even compared to iOS and Android smartphones. As a result, not every Ren'Py game will run well - or at all - on a Raspberry Pi. What's more, it's possible to crash Ren'Py by allowing a game to use more RAM than the system has available to it.
When the Raspberry Pi is configured correctly, Ren'Py should run using the device's hardware OpenGL ES. This means that it has the same limitations as the Android and iOS platforms, with respect to focus_mast not working.
Before Ren'Py is used, the Raspberry Pi should be reconfigured, using the raspi-config tool. These settings are under advanced options.
After changing the settings, reboot the Raspberry Pi.
As Rasberry Pi support doesn't ship with Ren'Py itself, it's necessary to download two files. The first is the Linux version of the SDK, and the second is the Raspberry Pi support files.
Untar the Linux version of the SDK, change into it, then untar the Raspberry Pi support files. When done correctly, the sdk will have a lib/linux-armv7l directory alongside lib/linux-i686 and lib/linux-x86_64.
As the Raspberry Pi is a resource-limited platform, we reccomend avoiding the Ren'Py launcher. Instead, we suggest using renpy.sh directly to launch the project, using a command like:
./renpy.sh /path/to/project