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+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

+

+

+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.

+

+

+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 Raspbian 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 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

+    LDFLAGS="-L$SYSROOT/opt/vc/lib" ../configure --with-sysroot=$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

+

+

+OpenGL problems

+---------------

+

+If you have desktop OpenGL headers installed at build time in your RPi or cross

+compilation environment, support for it will be built in. However, the chipset

+does not actually have support for it, which causes issues in certain SDL apps

+since the presence of OpenGL support supersedes the ES/ES2 variants.

+The workaround is to disable OpenGL at configuration time:

+

+    ./configure --disable-video-opengl

+

+Or if the application uses the Render functions, you can use the SDL_RENDER_DRIVER

+environment variable:

+

+    export SDL_RENDER_DRIVER=opengles2

+

+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.

+

+