Didj and Explorer libSDL
libSDL is a popular library for games and other applications. It provides APIs for events (buttons, etc), graphics, sound, and more.
Note: A framebuffer driver is required. **not strictly true, will still run audio without a framebuffer**
You will need to build libiconv for the didj:
create a folder in your packages dir called libiconv, then copy and paste the following into a text file and save it in the libiconv folder, call it install.sh (you might need to change permissions on the file as well).
#!/bin/bash BUILD_FROM_SOURCE=1 PKG_NAME=libiconv SRC=libiconv-1.13.1.tar.gz set -e . $PROJECT_PATH/scripts/functions # make sure all of the environment variables are good check_vars # exit if the user is root check_user # parse args set_standard_opts $* pushd $PROJECT_PATH/packages/$PKG_NAME BUILD_DIR=`echo "$SRC" | cut -d '.' -f -3` if [ "$CLEAN" == "1" -o ! -e $BUILD_DIR ]; then rm -rf $BUILD_DIR tar -xjf $SRC fi pushd $BUILD_DIR CFLAGS="-I$PROJECT_PATH/packages/$PKG_NAME/libiconv-1.13.1/ -O3 -fPIC -mcpu=arm926ej-s" LDFLAGS=-L$PROJECT_PATH/packages/$PKG_NAME/libiconv-1.13.1/ ./configure --host=arm-linux --target=arm-linux --prefix=$ROOTFS_PATH/usr --enable-shared make clean make make install popd popd exit 0
Now that you've got an install script you can run it with the following command:
This will download the package for you, unpack it, set the necessary vars then compile and install libiconv. You should only need to do CLEAN=1 for the first time you run it, that's the var that triggers a clean download and install.
Build the SDL library
To build SDL, first download and unpack it:
wget http://www.libsdl.org/release/SDL-1.2.13.tar.gz tar -xf SDL-1.2.13.tar.gz cd SDL-1.2.13
You'll need a toolchain, for example this one
Now try the following, but replace the "/path/to" lines with paths on your system. You'll want to tell the build system where to install libSDL and where to look for kernel headers
CFLAGS="-I/path/to/kernel/linux-2.6/include/" CC=arm-linux-uclibcgnueabi-gcc CXX=arm-linux-uclibcgnueabi-g++ ./configure --prefix=/path/to/rootfs//usr/ --build=`uname -m` --host=arm-linux --disable-video-opengl --disable-video-x11 --disable-esd --disable-video-directfb --enable-video-fbcon --enable-pulseaudio=no
If that succeeds, try building and installing:
make make install
You should see libSDL.so in usr/lib in your rootfs directory as well as its header files in "usr/include". When building applications against libSDL, tell the compiler to look for headers and the linker to look for libraries there (ie: CFLAGS="-I/path/to/rootfs/usr/include" and LDFLAGS="-L/path/to/rootfs/usr/lib").
Set up the device
Copy the .so files and symlinks to your device. Also edit "/etc/profile" on your device and add some environment variables for SDL:
export SDL_NOMOUSE=1 export SDL_FBDEV="/dev/fb0" export SDL_VIDEODRIVER="fbcon" export SDL_AUDIODRIVER="dsp" export SDL_PATH_DSP="/dev/dsp" export SDL_DEBUG="1" export SDL_FBACCEL="0"
For Explorer, the touchscreen works sort of like a mouse (TODO: add tslib support?), so you could try:
export SDL_MOUSEDEV="/dev/input/event3" export SDL_FBDEV="/dev/fb0" export SDL_VIDEODRIVER="fbcon" export SDL_AUDIODRIVER="dsp" export SDL_PATH_DSP="/dev/dsp" export SDL_DEBUG="1" export SDL_FBACCEL="0"
You'll need to source that on your device:
or just reboot. You should now be able to run SDL programs or demos as long as your device is set up with a standard Linux framebuffer and console in place of the LeapFrog-supplied graphics drivers.
* better audio support? * tslib to make touchscreen usable on Explorer?