Crosshair for lightgun games

[ner00]

Could devs add a crosshair option to Mesen for usage with lightgun games?

The only alternative is to press F11 to show the OS mouse cursor and aim the mouse cursor, which is still better than nothing, but still...

I suppose this might have been mentioned before, but I couldn't find any existing issue for it on the fork.

[keithbowes]

I've thought about this. Currently, Mesen only uses the pointer API. I thought that it could keep the current behavior for the pointer API, but show the crosshair for the mouse and lightgun APIs. The F11 (or whatever key you have this mapped to; for me, it's M) workaround isn't universal; for example, when I play games in KMS (negating the need to load a graphics server), there's no pointer shown at all.

I've been a bit hesitant about trying to do this, considering how slow Mesen is and how slowly it compiles; it would just be for completion sake. The code for crosshairs is already available in FCEUmm and Nestopia, so it surely wouldn't be too hard to adapt.