bsnes-hd is a mod of bsnes by byuu (high-level emulation for co-processors came right on time for this). It performs Mode 7 transformations (incl. HDMA) at up to 4 times the horizontal and vertical resolution.
Smooth (true color, high resolution) gradients for color math from fixed color, e.g. for pseudo perspectives
True color processing for all color operations
Fixed crashes on combined high scale and widescreen settings
HD and super sampling scale up to 10x (4K+)
preview: Smooth (high resolution) Window effects, like shadows or spells (top and bottom edges have issues)