| author | Gabriel Jacobo <gabomdq@gmail.com> |
| Sat, 12 Oct 2013 11:35:47 -0300 | |
| changeset 7806 | 03e6aaea8347 |
| parent 7778 | a571a9947869 |
| child 7808 | 627f256b0e56 |
| permissions | -rw-r--r-- |
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parents:
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================================================================================ |
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SDL2 for Raspberry Pi |
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parents:
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Requirements: |
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parents:
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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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parents:
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* Input (mouse/keyboard/joystick) via EVDEV |
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parents:
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* Hotplugging of input devices via UDEV |
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parents:
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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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parents:
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OpenGL ES 2.x, it usually comes pre installed, but in any case: |
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parents:
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parents:
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sudo apt-get install libraspberrypi0 libraspberrypi-bin libraspberrypi-dev |
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parents:
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parents:
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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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parents:
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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 $SYSROOT/sys |
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sudo umount /mnt |
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The final step is compiling SDL itself. |
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export CC="/opt/rpi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc --sysroot=$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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================================================================================ |
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Apps don't work or poor video/audio performance |
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================================================================================ |
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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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================================================================================ |
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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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parents:
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No HDMI Audio |
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================================================================================ |
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parents:
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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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================================================================================ |
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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 emmited, 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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* Input events from the keyboard leak through to the console |
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