A few weeks ago I started working on a SDL2 port for the Wii and GameCube. The current status is this:
Audio
Send audio to wiimote
Joysticks
Gamepads
Rumble support
Keyboard
Mouse
Wiimote IR as mouse
Mouse cursors
USB Mouse
Power
Sensors
Time
Threads
Video
Framebuffer
2D acceleration
The source code is available at https://github.com/mardy/SDL/tree/ogc-sdl2-2.28 (be sure to checkout...
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Source: https://gbatemp.net/threads/sdl-2-port-ongoing.645576/