Re: [w3c/gamepad] Added a supplemental "Extensions" spec (#32)

For linear actuators, that may include devices such as this:

http://www.geomagic.com/en/products-landing-pages/haptic

Such a device would expose 3 axis aligned actuators which drive the physical motors through inverse kinematics.

Perhaps "linear" may be confused with LRA (Linear Resonant Actuator) like those in the steam controller.  LRA's are capable of oscillating at specific resonant frequencies only and should be represented as "vibration" actuators.

Fundamental to this API is the concept of additive combining of haptics and force feedback systems.  My intent was to show that the API is agnostic of actuator type and extensible by showing at least one additional type of actuator that has an absolute value with a range centered around 0.

Perhaps a more immediate use case to illustrate the use of an absolute position actuator would be to describe the rotational friction, rotational spring (centering), and rotational force actuators as used in a steering wheel controller.


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