I'm toying around with my first experiment in HD MMF2 games, mostly for fun for a friend as practice for the future, but I've come across one issue, that'd be left/right sprites. Normally I just copy and paste for left and right frames, flipping in the editor, but when you have HD graphics, this means two copies of a full color animation with alpha.
Right now it doesn't seem to be an issue when modern games can take at least 1/2 GB of memory, but I'm still wary of all those cloned animation frames being loaded into memory like that, they don't seem to unload until you change frames which can be bad if you don't reload the frame between, say, an in-game cutscene, a level and then a screen-sized boss, all loading up with two directions of frames if there's no fix too.
The obvious solution of course is to use a shader to flip it, which I did, "Flip" in the Complex-softwares pack. It worked at first, but I realize that hotspots/alignments seem to be a bit off, the character's sprite noticably jumps about horizontally in some animations. Is there a shader that deals with this properly? If not, I might have to just go and flip sprites anyway and hope it turns out okay.