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Experimental and for linux pros only
These steps are what I use to compile stuff by copying things from my Windows computer. A normal user would probably just grab the svn tree.
Step 1: Make OpenGL ES 1/2 work on the Raspberry Pi 2 or 3. Strangely, as of June 18th 2016 the versions you can get with apt-get are compiled with the wrong flags so it won't work with the hardware acceleration. Useless. So we will install our own SDL2.
I did this with the latest version of Raspbian (Jessie I think).
cd ~ sudo apt-get install libfreeimage-dev libopenal-dev libpango1.0-dev libsndfile1-dev libudev-dev libasound2-dev libjpeg-dev libtiff5-dev libwebp-dev automake wget https://www.libsdl.org/release/SDL2-2.0.4.tar.gz tar zxvf SDL2-2.0.4.tar.gz cd SDL2-2.0.4 && mkdir build && cd build ../configure --host=armv7l-raspberry-linux-gnueabihf --disable-pulseaudio --disable-esd --disable-video-mir --disable-video-wayland --disable-video-x11 --disable-video-opengl make -j 4 sudo make install
To test your GL ES, do this with a local shell (not a remote shell window.. although maybe that works, dunno)
cd ~/SDL2-2.0.4/test g++ -o testgles2 testgles2.c `sdl2-config --cflags --libs` ./testgles2
If stuff is setup right, you'll see some triangles or something rendering smoothly.
Step 2: Proton stuff
If you look at the RTBarebones/linux dir you'll see the CMakeLists.txt file autodetect the pi and sets up GLES 1.1 headers stuff for it.