[Feature Request] Core can read 'Game Focus Mode' state.

[fatshark-ajn]

It would be very helpful for keyboard oriented cores to have the ability to check if RetroArch is in 'Game Focus Mode' or not. So the user can be informed that they need (for any practical purposes at least) enter 'Game Focus Mode' in order to interact with the emulator.

This would make the user experience so much better for some cores while at the same time have a relatively small impact on API complexity and I imagine that the feature is pretty easy to implement in the frontend as well.

[cmitu]

I think this is already implemented, configurable with the input_auto_game_focus option.

[andreas-jonsson]

I think that just allows you to auto enter focus mode if you have a keyboard handler registered.

Is was looking for a way for the core to check wether focus mode was enabled or not. So it could potentially inform the user that focus mode is more or less a requirement for using the core.

Any home computer system emulator kinda requires focus mode to function properly since keyboard is the main input method.

[cmitu]

I think that just allows you to auto enter focus mode if you have a keyboard handler registered.

It's not just that - the core has to also have support for it.

I don't know if the activation depends on the .info file for the core or the core can read the setting option, but you can check how dosbox-core does it to switch to game focus automatically or to send an info message to the user when game focus is not active.

EDIT: I meant to say dosbox-pure instead of dosbox-core.

[zoltanvb]

Good find about dosbox-pure, but it can only warn, based on heuristics:
https://github.com/schellingb/dosbox-pure/blob/c992ab146af774d461e8eb0cc8949564745a4e11/dosbox_pure_osd.h#L1625

Game focus needs no support from core (apart from a keyboard handler).