mirror of
https://github.com/Relintai/sdl2_frt.git
synced 2024-12-20 22:16:49 +01:00
162 lines
6.7 KiB
Markdown
162 lines
6.7 KiB
Markdown
Raspberry Pi
|
|
================================================================================
|
|
|
|
Requirements:
|
|
|
|
Raspbian (other Linux distros may work as well).
|
|
|
|
================================================================================
|
|
Features
|
|
================================================================================
|
|
|
|
* Works without X11
|
|
* Hardware accelerated OpenGL ES 2.x
|
|
* Sound via ALSA
|
|
* Input (mouse/keyboard/joystick) via EVDEV
|
|
* Hotplugging of input devices via UDEV
|
|
|
|
|
|
================================================================================
|
|
Raspbian Build Dependencies
|
|
================================================================================
|
|
|
|
sudo apt-get install libudev-dev libasound2-dev libdbus-1-dev
|
|
|
|
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
|
|
|
|
================================================================================
|
|
Cross compiling from x86 Linux
|
|
================================================================================
|
|
|
|
To cross compile SDL for Raspbian from your desktop machine, you'll need a
|
|
Raspbian system root and the cross compilation tools. We'll assume these tools
|
|
will be placed in /opt/rpi-tools
|
|
|
|
sudo git clone --depth 1 https://github.com/raspberrypi/tools /opt/rpi-tools
|
|
|
|
You'll also need a Rasbian binary image.
|
|
Get it from: http://downloads.raspberrypi.org/raspbian_latest
|
|
After unzipping, you'll get file with a name like: <date>-wheezy-raspbian.img
|
|
Let's assume the sysroot will be built in /opt/rpi-sysroot.
|
|
|
|
export SYSROOT=/opt/rpi-sysroot
|
|
sudo kpartx -a -v <path_to_raspbian_image>.img
|
|
sudo mount -o loop /dev/mapper/loop0p2 /mnt
|
|
sudo cp -r /mnt $SYSROOT
|
|
sudo apt-get install qemu binfmt-support qemu-user-static
|
|
sudo cp /usr/bin/qemu-arm-static $SYSROOT/usr/bin
|
|
sudo mount --bind /dev $SYSROOT/dev
|
|
sudo mount --bind /proc $SYSROOT/proc
|
|
sudo mount --bind /sys $SYSROOT/sys
|
|
|
|
Now, before chrooting into the ARM sysroot, you'll need to apply a workaround,
|
|
edit $SYSROOT/etc/ld.so.preload and comment out all lines in it.
|
|
|
|
sudo chroot $SYSROOT
|
|
apt-get install libudev-dev libasound2-dev libdbus-1-dev libraspberrypi0 libraspberrypi-bin libraspberrypi-dev libx11-dev libxext-dev libxrandr-dev libxcursor-dev libxi-dev libxinerama-dev libxxf86vm-dev libxss-dev
|
|
exit
|
|
sudo umount $SYSROOT/dev
|
|
sudo umount $SYSROOT/proc
|
|
sudo umount $SYSROOT/sys
|
|
sudo umount /mnt
|
|
|
|
There's one more fix required, as the libdl.so symlink uses an absolute path
|
|
which doesn't quite work in our setup.
|
|
|
|
sudo rm -rf $SYSROOT/usr/lib/arm-linux-gnueabihf/libdl.so
|
|
sudo ln -s ../../../lib/arm-linux-gnueabihf/libdl.so.2 $SYSROOT/usr/lib/arm-linux-gnueabihf/libdl.so
|
|
|
|
The final step is compiling SDL itself.
|
|
|
|
export CC="/opt/rpi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc --sysroot=$SYSROOT -I$SYSROOT/opt/vc/include -I$SYSROOT/usr/include -I$SYSROOT/opt/vc/include/interface/vcos/pthreads -I$SYSROOT/opt/vc/include/interface/vmcs_host/linux"
|
|
cd <SDL SOURCE>
|
|
mkdir -p build;cd build
|
|
../configure --with-sysroot=$SYSROOT --host=arm-raspberry-linux-gnueabihf --prefix=$PWD/rpi-sdl2-installed --disable-pulseaudio --disable-esd
|
|
make
|
|
make install
|
|
|
|
To be able to deploy this to /usr/local in the Raspbian system you need to fix up a few paths:
|
|
|
|
perl -w -pi -e "s#$PWD/rpi-sdl2-installed#/usr/local#g;" ./rpi-sdl2-installed/lib/libSDL2.la ./rpi-sdl2-installed/lib/pkgconfig/sdl2.pc ./rpi-sdl2-installed/bin/sdl2-config
|
|
|
|
================================================================================
|
|
Apps don't work or poor video/audio performance
|
|
================================================================================
|
|
|
|
If you get sound problems, buffer underruns, etc, run "sudo rpi-update" to
|
|
update the RPi's firmware. Note that doing so will fix these problems, but it
|
|
will also render the CMA - Dynamic Memory Split functionality useless.
|
|
|
|
Also, by default the Raspbian distro configures the GPU RAM at 64MB, this is too
|
|
low in general, specially if a 1080p TV is hooked up.
|
|
|
|
See here how to configure this setting: http://elinux.org/RPiconfig
|
|
|
|
Using a fixed gpu_mem=128 is the best option (specially if you updated the
|
|
firmware, using CMA probably won't work, at least it's the current case).
|
|
|
|
================================================================================
|
|
No input
|
|
================================================================================
|
|
|
|
Make sure you belong to the "input" group.
|
|
|
|
sudo usermod -aG input `whoami`
|
|
|
|
================================================================================
|
|
No HDMI Audio
|
|
================================================================================
|
|
|
|
If you notice that ALSA works but there's no audio over HDMI, try adding:
|
|
|
|
hdmi_drive=2
|
|
|
|
to your config.txt file and reboot.
|
|
|
|
Reference: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=5062
|
|
|
|
================================================================================
|
|
Text Input API support
|
|
================================================================================
|
|
|
|
The Text Input API is supported, with translation of scan codes done via the
|
|
kernel symbol tables. For this to work, SDL needs access to a valid console.
|
|
If you notice there's no SDL_TEXTINPUT message being emitted, double check that
|
|
your app has read access to one of the following:
|
|
|
|
* /proc/self/fd/0
|
|
* /dev/tty
|
|
* /dev/tty[0...6]
|
|
* /dev/vc/0
|
|
* /dev/console
|
|
|
|
This is usually not a problem if you run from the physical terminal (as opposed
|
|
to running from a pseudo terminal, such as via SSH). If running from a PTS, a
|
|
quick workaround is to run your app as root or add yourself to the tty group,
|
|
then re login to the system.
|
|
|
|
sudo usermod -aG tty `whoami`
|
|
|
|
The keyboard layout used by SDL is the same as the one the kernel uses.
|
|
To configure the layout on Raspbian:
|
|
|
|
sudo dpkg-reconfigure keyboard-configuration
|
|
|
|
To configure the locale, which controls which keys are interpreted as letters,
|
|
this determining the CAPS LOCK behavior:
|
|
|
|
sudo dpkg-reconfigure locales
|
|
|
|
================================================================================
|
|
Notes
|
|
================================================================================
|
|
|
|
* When launching apps remotely (via SSH), SDL can prevent local keystrokes from
|
|
leaking into the console only if it has root privileges. Launching apps locally
|
|
does not suffer from this issue.
|
|
|
|
|