At Libretro the guys managed to do xBRZ in an arbitrary fashion, which i thought could be cool for WinUAE also.
The shader itself is a bit lighter then integer scale xBRZ, but i would advise to use it with 2x multiplier, is enough for 1080p.
You can also adjust the shader #define when using it with 1x - is around 4x faster, but not as crisp.
Happyhats!
