gosu c++ tutorial: https://github.com/jlnr/gosu/wiki/C---Tutorial
compile with:
g++ -fopenmp -03 main.cpp libgosu.a gosu-config --libs -o my_game
to profile, make loop stop after n rounds
g++ -fopenmp -pg main.cpp libgosu.a gosu-config --libs -o my_game
./my_game
gprof my_game > gprof.output