A texture sheeeet player for you guys! Tried to do as much as possible on gpu. Works with sheets of different grid layouts - just name your files properly. Controls are cpu, you may async as you wish. Something like that could be a really nice addon to a gpu particle system.
SheetPlayerArray.zip (1.6 MB)
Thanks to @bjoern for his Stride Texture Array, and @catweasel for his point sprites example.