kc3-lang/SDL/README-raspberrypi.txt

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• Hash : e9d21339
  Author :
  Date : 2013-10-13T17:15:43
  

  Prevent keystrokes from leaking through to the console when using evdev. This uses the same method Weston and X use. Sadly, to be fully effective when launching remotely, this needs root permissions.

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• README-raspberrypi.txt

• ================================================================================
  SDL2 for 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
  
  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 emmited, 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.
    
  
  

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