Can SDL work on Ubuntu Touch?
It will be usable with Mir as SDL has added support for Mir.
With Mir and SDL playing nice together, games using it will run natively under Unity 8 on Mir – no fuss, no hassle, and no discernible difference from that of the traditional X server.
Mir is the display server used in last ubuntu versions developped by cannonical
Reference: Some of Linux’s Most Popular Games Will Run Natively On Mir