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docs/README-raspberrypi.md: Initial updates.

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This document needs a _lot_ of modernization! This was just some initial
improvements, and a warning that the rest is probably obsolete.

Fixes #11444.
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Ryan C. Gordon 2024-11-13 19:55:25 -05:00
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docs/README-raspberrypi.md
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@ -3,27 +3,35 @@ Raspberry Pi
Requirements:
Raspbian (other Linux distros may work as well).
Raspberry Pi OS (other Linux distros may work as well).
Features
--------
In modern times, the Raspberry Pi works mostly like any other Linux device:
for video, you can use X11, Wayland, or KMSDRM. For audio, you can use ALSA,
PulseAudio, or PipeWire, etc. OpenGL, OpenGL ES, and Vulkan are known to work.
* Works without X11
* Hardware accelerated OpenGL ES 2.x
* Sound via ALSA
* Input (mouse/keyboard/joystick) via EVDEV
* Hotplugging of input devices via UDEV
There is a video backend in SDL called "rpi" that uses a deprecated Broadcom
interface (named "dispmanx") to draw directly to the console without X11.
Newer Raspberry Pi OS releases don't support this (and work fine with our
"kmsdrm" backend for the same purposes, a standard Linux interface). Don't
panic if you can't use this backend, or CMake says it can't find libraries it
needs for this.
SDL has, in past times, worked on the original Raspberry Pi and the RPi 2, but
these devices are no longer targets we actively test; if they broke, please
report bugs or send patches!
The Raspberry Pi 3 and later (in 32-bit and 64-bit mode) are still known to
work well at the time of this writing. The Raspberry Pi Zero and Zero 2 are
also known to work well.
Raspbian Build Dependencies
---------------------------
## Documentation Out Of Date
sudo apt-get install libudev-dev libasound2-dev libdbus-1-dev
The rest of this document is likely out of date; a lot has changed in recent
years in both SDL and the Raspberry Pi universe, and this document has not
been updated to reflect those details. Take the rest of this information with
a grain of salt!
You also need the VideoCore binary stuff that ships in /opt/vc for EGL and
OpenGL ES 2.x, it usually comes pre-installed, but in any case:
sudo apt-get install libraspberrypi0 libraspberrypi-bin libraspberrypi-dev
NEON
@ -31,8 +39,8 @@ NEON
If your Pi has NEON support, make sure you add -mfpu=neon to your CFLAGS so
that SDL will select some otherwise-disabled highly-optimized code. The
original Pi units don't have NEON, the Pi2 probably does, and the Pi3
definitely does.
original Pi units don't have NEON, the Pi2/PiZero probably do, and the Pi3 and
Zero2 definitely do.
Cross compiling from x86 Linux