Re: [gamepad] Only 4 Controllers?

On Thu, Dec 22, 2016 at 6:43 PM, Boris Zbarsky <bzbarsky@mit.edu> wrote:

> On 12/22/16 6:17 AM, Florian Bösch wrote:
>
>> Afaik this stems from a limitation of Windows not shared by other OS'es.
>> Does Firefox behave similarly?
>>
>
> The Firefox behavior is as follows:
>
> 1)  There is no limit.
> 2)  Only entries for gamepads that are or were present are returned.
> 3)  If a gamepad is removed, its spot in the array becomes null.
>
> So calling getGamepad() if there are no gamepads will return an empty
> array.  At least on Mac; I haven't tested on Windows.
>
> Note that the length of the array _has_ to be able to be more than 4,
> because of the connection/disconnection behavior.  If I connect and then
> disconnect 5 gamepads and then connect a 6th one, the spec requires that an
> array of length 6 be returned.
>
> That said, the spec allows the array to be arbitrarily longer than the
> actual set of gamepads, padded with null; this is indistinguishable from
> the state where gamepads used to exist at those indices and then were
> disconnected.  So the Chrome/IE behavior described of returning a length-4
> array filled with null (not undefined) is spec-compliant.

It's kinda interesting though - and a very good example of what can be
misinterpreted/misused if specs are not precise ;)

>
>
> -Boris
>
>