Can you tell me all of these many JJ effects that will be faster in software, so SW renderer has to be made? I'm not going to do software rendering, Jazz 2 Resurrection is modern shader-based game and it's not possible to render all Jazz 2 Resurrection effects in software (e.g. normal mapping).
And auto upscaling is present in Jazz 2 Resurrection from the first release, it supports any resolution/aspect ratio you want.

ES2 Backend is almost done, but I have to rewrite all shaders and probably make them more simple...