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7 Raspbian (other Linux distros may work as well).
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14 * Hardware accelerated OpenGL ES 2.x
16 * Input (mouse/keyboard/joystick) via EVDEV
17 * Hotplugging of input devices via UDEV
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20 Raspbian Build Dependencies
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23 sudo apt-get install libudev-dev libasound2-dev libdbus-1-dev
25 You also need the VideoCore binary stuff that ships in /opt/vc for EGL and
26 OpenGL ES 2.x, it usually comes pre installed, but in any case:
28 sudo apt-get install libraspberrypi0 libraspberrypi-bin libraspberrypi-dev
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31 Cross compiling from x86 Linux
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34 To cross compile SDL for Raspbian from your desktop machine, you'll need a
35 Raspbian system root and the cross compilation tools. We'll assume these tools
36 will be placed in /opt/rpi-tools
38 sudo git clone --depth 1 https://github.com/raspberrypi/tools /opt/rpi-tools
40 You'll also need a Rasbian binary image.
41 Get it from: http://downloads.raspberrypi.org/raspbian_latest
42 After unzipping, you'll get file with a name like: <date>-wheezy-raspbian.img
43 Let's assume the sysroot will be built in /opt/rpi-sysroot.
45 export SYSROOT=/opt/rpi-sysroot
46 sudo kpartx -a -v <path_to_raspbian_image>.img
47 sudo mount -o loop /dev/mapper/loop0p2 /mnt
48 sudo cp -r /mnt $SYSROOT
49 sudo apt-get install qemu binfmt-support qemu-user-static
50 sudo cp /usr/bin/qemu-arm-static $SYSROOT/usr/bin
51 sudo mount --bind /dev $SYSROOT/dev
52 sudo mount --bind /proc $SYSROOT/proc
53 sudo mount --bind /sys $SYSROOT/sys
55 Now, before chrooting into the ARM sysroot, you'll need to apply a workaround,
56 edit $SYSROOT/etc/ld.so.preload and comment out all lines in it.
59 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
61 sudo umount $SYSROOT/dev
62 sudo umount $SYSROOT/proc
63 sudo umount $SYSROOT/sys
66 The final step is compiling SDL itself.
68 export CC="/opt/rpi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc --sysroot=$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"
70 mkdir -p build;cd build
71 ../configure --with-sysroot=$SYSROOT --host=arm-raspberry-linux-gnueabihf --prefix=$PWD/rpi-sdl2-installed --disable-pulseaudio --disable-esd
75 To be able to deploy this to /usr/local in the Raspbian system you need to fix up a few paths:
77 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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80 Apps don't work or poor video/audio performance
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83 If you get sound problems, buffer underruns, etc, run "sudo rpi-update" to
84 update the RPi's firmware. Note that doing so will fix these problems, but it
85 will also render the CMA - Dynamic Memory Split functionality useless.
87 Also, by default the Raspbian distro configures the GPU RAM at 64MB, this is too
88 low in general, specially if a 1080p TV is hooked up.
90 See here how to configure this setting: http://elinux.org/RPiconfig
92 Using a fixed gpu_mem=128 is the best option (specially if you updated the
93 firmware, using CMA probably won't work, at least it's the current case).
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99 Make sure you belong to the "input" group.
101 sudo usermod -aG input `whoami`
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107 If you notice that ALSA works but there's no audio over HDMI, try adding:
111 to your config.txt file and reboot.
113 Reference: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=5062
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116 Text Input API support
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119 The Text Input API is supported, with translation of scan codes done via the
120 kernel symbol tables. For this to work, SDL needs access to a valid console.
121 If you notice there's no SDL_TEXTINPUT message being emmited, double check that
122 your app has read access to one of the following:
130 This is usually not a problem if you run from the physical terminal (as opposed
131 to running from a pseudo terminal, such as via SSH). If running from a PTS, a
132 quick workaround is to run your app as root or add yourself to the tty group,
133 then re login to the system.
135 sudo usermod -aG tty `whoami`
137 The keyboard layout used by SDL is the same as the one the kernel uses.
138 To configure the layout on Raspbian:
140 sudo dpkg-reconfigure keyboard-configuration
142 To configure the locale, which controls which keys are interpreted as letters,
143 this determining the CAPS LOCK behavior:
145 sudo dpkg-reconfigure locales
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151 * Input events from the keyboard leak through to the console