I've left all calculator-related stuff behind for a while now, but seeing that there's consistently some amount of activity going on with nSDL I might blow off the dust of my Windows laptop and release an update and refresh some things a bit.
However porting SDL 2 would take quite some time and the benefits of it aren't massive as far as the TI-Nspire is concerned.
Anyway yeah if you have some suggestions for any additions to the next update, do tell and I'll think about it. Stuff on GitHub and not in nSDL 1.1.1 (have been fermenting there for 10 months
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are faster text drawing and an NSDL_DISPLAY_BPP macro (that represents the calculator's display bit depth). I'll possibly add 24-bit support for nSDL_GetPixel and make nSDL_LoadImage automatically optimize the surface for the display bit depth. I should probably also go through Lepunzlag's nSDL_CustomFonts and see if and how integration would happen.