add gamepad input example

[jakkos-net]

For issue #26

I converted over a minimal version of this https://github.com/raysan5/raylib/blob/master/examples/core/core_input_gamepad.c example.

[chengchingwen]

I would need some time to test it. Currently it doesn't work on my linux with Xbox joystick, I would need to check if that is a problem of my computer.

[jakkos-net]

I would need some time to test it. Currently it doesn't work on my linux with Xbox joystick, I would need to check if that is a problem of my computer.

The screenshot I supplied was with a wired PS4 gamepad on a Windows machine. I can try on my Linux machine tomorrow.

[chengchingwen]

Seems to be a problem of missing gamepad mapping. Follow up the similar issue on raylib, I find a mapping from the DB and set it with Raylib.SetGamepadMappings, then it does work. I'm not sure it's because I'm using a weird joystick or there are some problems when we build the library so the mapping are missing.

@foldfelis Do you happen to have a Xbox joystick with you? I would like to make another test.

@jakkosdev I think after you can confirm that your PS4 gamepad also works on Linux, we could merge this example.

[foldfelis]

@chengchingwen yes, I have one XD. I can help with the tests.

[foldfelis]

@chengchingwen yes, I have one XD. I can help with the tests.

I have tested it on Windows, it works like charm

[chengchingwen]

@foldfelis What about Linux?

[foldfelis]

I don't have a Bluetooth adapter on my Linux machine 😭

[chengchingwen]

@jakkosdev We might still need you to test it on Linux, if you are ok with it.

[jakkos-net]

@jakkosdev We might still need you to test it on Linux, if you are ok with it.

I can't access my Linux machine at the moment as I'm self-isolating. If you still need me to test once I have access again, I will test it.

[chengchingwen]

Sorry to hear that.

It would be great if you can still test if after you have access again. For now I'm going to merge this example and track the problem in another issue. Thanks for the PR!