qzdoom-gpl/src/posix
..
cocoa
osx
sdl
dikeys.h
hardware.h
i_cd.cpp
i_input.h
i_movie.cpp
i_steam.cpp
i_system.cpp
i_system.h
readme.md
st_start.cpp

This directory contains files required to support POSIX-compatible OSes, like GNU/Linux, OS X or BSD.

Common files are placed in this directory directly.
SDL backend files are in sdl subdirectory.
Native OS X backend files are in cocoa subdirectory.
Shared files for both OS X backends are in osx subdirectory.