[Webkit-unassigned] [Bug 206033] Standard gamepad mapping for GameControllerGamepads

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206033

--- Comment #12 from Dean Jackson <dino at apple.com> ---
(In reply to James Howard from comment #7)

> > rationale for including the home button
> 
> My initial rationale was that the button exists on popular gamepads, the
> "standard" mapping reserves an index (16) in the buttons array for it, and
> Chrome on Mac does map this button when using Xbox and PlayStation gamepads. 
> 
> However, the spec is a little vague on this point [2]. It states that "up to
> 17 buttons" can be included, and while the binding is shown in the
> standard_gamepad.svg, the table in the remapping section doesn't list it.
> 
> Given that it's not an API on iOS, and that it is a button that is often
> reserved for system use elsewhere, I removed it from the patch and left the
> buttons array at 16 elements only, rather than 17.

Great. I don't think we should expose this while it isn't public API on the system.

> 
> I do worry a little bit about web apps that assume that the buttons array
> will always be 17 elements long, so maybe there is a case to be made that
> the 16th index should be present but just always 0, but I didn't do that for
> now. It's an easy change to make if we want to do that.

Let's see if it causes problems.

> 
> [1] https://w3c.github.io/gamepad/standard_gamepad.svg
> [2] https://w3c.github.io/gamepad/#remapping

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