Re: [w3c/gamepad] extensions: Add vibrationActuator and dual-rumble effect (PR #163)

@nondebug commented on this pull request.



> +      <table class="simple">
+        <tr>
+          <th>
+            Internal slot
+          </th>
+          <th>
+            Initial value
+          </th>
+          <th>
+            Description (non-normative)
+          </th>
+        </tr>
+        <tr>
+          <td>
+            <dfn data-dfn-for=
+            "GamepadHapticActuator">[[\playingEffectPromise]]</dfn>

> In theory, it should be possible to activate multiple actuators at the same time, no?

With the current proposal for trigger rumble, it should work to issue a "trigger-rumble" effect that contains the parameters from the "dual-rumble" effect along with the parameters for the trigger effect. Something like:

```
// rumble and vibrate right trigger
const effectParams = {rightTrigger: 1.0, strongMagnitude: 0.2, weakMagnitude: 0.2, duration: 2000};
gamepad.vibrationActuator.play("trigger-rumble", effectParams);
```

The actuators can be controlled independently by preempting the ongoing effect:

```
// stop trigger vibration, keep rumble
effectParams.rightTrigger = 0.0;
gamepad.vibrationActuator.play("trigger-rumble", effectParams);
```

I think the API should not support simultaneous effects on a single GamepadHapticActuator. If there is an ongoing effect when a new effect is played, the ongoing effect is canceled before the new effect begins.

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