doc/README-raspberrypi.md
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Rearrange documentation 1) Moves all READMEs to docs/ 2) Renames them to *.md, adds some Markdown with the idea to add a lot more 3) Moves the doxyfile config to doc/ and makes it parse the headers at ../include as well as the md files in docs. 4) Skips SDL_opengl*.h headers from the docs 5) Minor fixes to doxyfile
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Raspberry Pi
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Requirements:
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Raspbian (other Linux distros may work as well).
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 Features
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* Works without X11
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* Hardware accelerated OpenGL ES 2.x
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* Sound via ALSA
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* Input (mouse/keyboard/joystick) via EVDEV
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* Hotplugging of input devices via UDEV
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================================================================================
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 Raspbian Build Dependencies
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sudo apt-get install libudev-dev libasound2-dev libdbus-1-dev
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You also need the VideoCore binary stuff that ships in /opt/vc for EGL and 
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OpenGL ES 2.x, it usually comes pre installed, but in any case:
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sudo apt-get install libraspberrypi0 libraspberrypi-bin libraspberrypi-dev
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================================================================================
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 Cross compiling from x86 Linux
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To cross compile SDL for Raspbian from your desktop machine, you'll need a
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Raspbian system root and the cross compilation tools. We'll assume these tools
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will be placed in /opt/rpi-tools
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    sudo git clone --depth 1 https://github.com/raspberrypi/tools /opt/rpi-tools
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You'll also need a Rasbian binary image.
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Get it from: http://downloads.raspberrypi.org/raspbian_latest 
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After unzipping, you'll get file with a name like: <date>-wheezy-raspbian.img
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Let's assume the sysroot will be built in /opt/rpi-sysroot.
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    export SYSROOT=/opt/rpi-sysroot
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    sudo kpartx -a -v <path_to_raspbian_image>.img
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    sudo mount -o loop /dev/mapper/loop0p2 /mnt
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    sudo cp -r /mnt $SYSROOT
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    sudo apt-get install qemu binfmt-support qemu-user-static
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    sudo cp /usr/bin/qemu-arm-static $SYSROOT/usr/bin
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    sudo mount --bind /dev $SYSROOT/dev
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    sudo mount --bind /proc $SYSROOT/proc
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    sudo mount --bind /sys $SYSROOT/sys
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Now, before chrooting into the ARM sysroot, you'll need to apply a workaround,
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edit $SYSROOT/etc/ld.so.preload and comment out all lines in it.
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    sudo chroot $SYSROOT
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    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
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    exit
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    sudo umount $SYSROOT/dev
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    sudo umount $SYSROOT/proc
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    sudo umount $SYSROOT/sys
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    sudo umount /mnt
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There's one more fix required, as the libdl.so symlink uses an absolute path 
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which doesn't quite work in our setup.
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    sudo rm -rf $SYSROOT/usr/lib/arm-linux-gnueabihf/libdl.so
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    sudo ln -s ../../../lib/arm-linux-gnueabihf/libdl.so.2 $SYSROOT/usr/lib/arm-linux-gnueabihf/libdl.so
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The final step is compiling SDL itself.
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    export CC="/opt/rpi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc --sysroot=$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"
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    cd <SDL SOURCE>
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    mkdir -p build;cd build
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    ../configure --with-sysroot=$SYSROOT --host=arm-raspberry-linux-gnueabihf --prefix=$PWD/rpi-sdl2-installed --disable-pulseaudio --disable-esd
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    make
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    make install
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To be able to deploy this to /usr/local in the Raspbian system you need to fix up a few paths:
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    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
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================================================================================
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 Apps don't work or poor video/audio performance
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If you get sound problems, buffer underruns, etc, run "sudo rpi-update" to 
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update the RPi's firmware. Note that doing so will fix these problems, but it
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will also render the CMA - Dynamic Memory Split functionality useless.
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Also, by default the Raspbian distro configures the GPU RAM at 64MB, this is too
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low in general, specially if a 1080p TV is hooked up.
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See here how to configure this setting: http://elinux.org/RPiconfig
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Using a fixed gpu_mem=128 is the best option (specially if you updated the 
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firmware, using CMA probably won't work, at least it's the current case).
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================================================================================
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 No input
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Make sure you belong to the "input" group.
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    sudo usermod -aG input `whoami`
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================================================================================
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 No HDMI Audio
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If you notice that ALSA works but there's no audio over HDMI, try adding:
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    hdmi_drive=2
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to your config.txt file and reboot.
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Reference: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=5062
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================================================================================
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 Text Input API support
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The Text Input API is supported, with translation of scan codes done via the
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kernel symbol tables. For this to work, SDL needs access to a valid console.
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If you notice there's no SDL_TEXTINPUT message being emitted, double check that
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your app has read access to one of the following:
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* /proc/self/fd/0
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* /dev/tty
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* /dev/tty[0...6]
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* /dev/vc/0
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* /dev/console
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This is usually not a problem if you run from the physical terminal (as opposed
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to running from a pseudo terminal, such as via SSH). If running from a PTS, a 
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quick workaround is to run your app as root or add yourself to the tty group,
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then re login to the system.
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   sudo usermod -aG tty `whoami`
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The keyboard layout used by SDL is the same as the one the kernel uses.
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To configure the layout on Raspbian:
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    sudo dpkg-reconfigure keyboard-configuration
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To configure the locale, which controls which keys are interpreted as letters,
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this determining the CAPS LOCK behavior:
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    sudo dpkg-reconfigure locales
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================================================================================
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 Notes
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================================================================================
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* When launching apps remotely (via SSH), SDL can prevent local keystrokes from
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  leaking into the console only if it has root privileges. Launching apps locally
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  does not suffer from this issue.
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