Discussion
BSNES includes a "Ruby" support library for offering common interfaces for audio, video, & input on different platforms.
For audio it supports PulseAudio (via either of its protocols), Open Sound System, OpenAL, Direct Sound, Wave Out, XAudio2, WASAPI, AO, ASIO, & ALSA.
For input it supports Carbon, Quartz, XLib, Windows, UDev, & SDL. Specifically for Joypads there's ports to SDL, XInput, UDev, I/OKit, & Direct Input. For keyboards there's Carbon, Quartz, raw input, & XLib.
1/2?
For mice there's ports for raw input & XLib. And then there's shared code for said raw input.
For video output there's ports for GDI, GLX & GLX2, DirectDraw, WGL, XShm, Direct3D, CGL, & XVideo.
And there's some OpenGL abstractions particularly relating to shaders. Including compiling shaders, setting uniforms, dynamically-linking OpenGL, configuring OpenGL according to datafiles, some baseline shaders, a public API, textures, & surfaces.
2/2.1!
I'll note that some of these APIs are more verbose than others, & if you want to know which Linux's: Most of them! Linux gives you (meaningless) choices.
2.2/2.2 Fin for today! Tomorrow: OpenGL Shaders emulating CRTs.
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