HTML5 Gamepad API

[SpliFF]

Changes to allow the use of physical game devices such as gamepads and joysticks on browsers that support the HTML5 Gamepad API.

To use a physical gamepad select "Joystick" for either port in Config->Ports. The existing emulated joystick can be selected by choosing "Emulated" from the same dropdown.

Tested on:

• Firefox 54 and Chrome 59 on Windows 7
• Microsoft Edge 25 on Windows 10
• Firefox 54 on Linux Mint 15

Known Issues:

• Firefox requires a button on the controller to be pressed before controllers are detected
• Chrome only detects connection events when you switch to another tab and return (seriously??)
• Firefox calls devices "xinput" rather than finding the controller proper model name

These are all browser bugs so not much can be done about them.

[naTmeg]

Hi SpliFF, sorry for the delay. This looks interesting, I'll check it...

[naTmeg]

...nice work! I've extended some things, fixed problems (no call to cancelAnimationFrame(), malformed Joystick.button[]) and did some syntax-cosmetics. Also renamed 'Port 1/2' back to 'Mouse/Game', because this is printed on Amigas. I've finally also added the pointerLock-API, so I do an own commit.

Thanks for your time and work!