Re: [w3c/gamepad] Add device orientation support (Issue #211)

JibbSmart left a comment (w3c/gamepad#211)

GamepadPose is an interesting one, but appears to be designed for VR applications, where "position" and "orientation" make sense.

Standard controllers can only provide:
1. **linearAcceleration** - which will give (0, 0, 0) when in freefall, making it useful for figuring out the direction of gravity when it's _not_ in freefall;
2. **angularVelocity** - which will probably need to be calibrated by the application. If calibration is handled automatically, there should be a way for developers to disable this automatic calibration.

Some (but not many) controllers will also have a magnetometer which will help with bearing, but most don't, so games that need an "orientation" will either make do with the gravity direction. Most games with some sort of gyro/motion aiming don't need/want orientation, though :)

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