The game porting toolkit allows windows DX shaders to get runtime translated to high performance metal shaders.

It provides a path for Rosetta and Wine to handle what they are good at while letting Apple handle the shader lowering in many cases better then dxvk -> moltenvk -> metal (or whatever the new state of the art thing is, I forget the name).

It’s not JUST for helping with manual porting of the cpu side code.