Re: [w3c/gamepad] Enhance Gamepad interface description for Touch (PR #168)

@bradleyneedham commented on this pull request.



> +              `touchData.touchID`.
+              </li>
+              <li>Set |touchEvent|.{{GamepadTouch/surfaceId}} to be
+              device surfaceId.
+              </li>
+              <li>Set |touchEvent|.{{GamepadTouch/position}}[0] to be
+              |normalizedX:float|.
+              </li>
+              <li>Set |touchEvent|.{{GamepadTouch/position}}[1] to be
+              |normalizedY:float|.
+              </li>
+              <li>Set |touchEvent|.{{GamepadTouch/surfaceDimensions}}[0] to be
+              device max x-axis coordinate.
+              </li>
+              <li>Set |touchEvent|.{{GamepadTouch/surfaceDimensions}}[1] to be
+              device max y-axis coordinate.<p>(<i>note: surfaceDimensions can be set to `null`</i>)</p>

This may need more discussion. Perhaps there is not a case where surfaceDimensions can be null. For the DS4 touch coordinates are normalized using the device touch point and the surface dimensions. Should the algorithm include receiving input from a device that sends already normalized touch points and does not report surface dimensions?

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