added metal support for macosx version (based on rust_minifb)

[Darky-Lucera]

I added a compiler define USE_METAL_API to avoid removing support for old macos. So you must define it before compile the code for MacOs X mojave.

[emoon]

Awesome! Thanks a lot

[Darky-Lucera]

I would like to add some basic interaction events to miniFB (mouse & keyboard). I had implemented them for windows already , but I have seen that you have done something similar for rust_minifb.
Do you agree with this idea?

[emoon]

Yeah that sounds like a good idea. For macOS and Linux it's likely easy to just port parts of that code as it's in C/ObjC anyway. The Windows version is written fully in Rust but it should be quite straightforward to adapt your code to the API if you want. One problem I noticed with the way I implemented the API in rust_minifb is that it "stalls" / is a bit slow to check the events on the main thread the way it's designed.

I'm not sure how to change the design or if it's worth it as the API for keyboard mouse is quite nice to use so I would like to have the C version in a similar direction.