private static extern int GvrShimUnity_getControllerState(int device, ref GvrShimUnityControllerState state);
/// Reads the controller's current state and stores it in outState.
public void ReadState(ControllerState outState, int controller_id)
{
int retval = 0;
if (lastUpdateFrame != Time.frameCount)
{
lastUpdateFrame = Time.frameCount;
retval = GvrShimUnity_updateState();
if (retval != GVR_SHIM_OK)
{
Debug.LogError("GvrShimUnity_updateState returned error.");
return;
}
}
int connStatus = 0;
retval = GvrShimUnity_getControllerConnectionStatus(controller_id, ref connStatus);
if (retval != GVR_SHIM_OK)
{
Debug.LogError("GvrShimUnity_getControllerConnectionStatus returned error.");
return;
}
outState.connectionState = ConvertConnectionState(connStatus);
// Early out if not connected. No other state is relevant.
if (outState.connectionState != GvrConnectionState.Connected)
{
return;
}
GvrShimUnityControllerState aState = new GvrShimUnityControllerState();
retval = GvrShimUnity_getControllerState(controller_id, ref aState);
if (retval != GVR_SHIM_OK)
{
Debug.LogError("GvrShimUnity_getControllerState returned error.");
return;
}
// Convert GVR API orientation (right-handed) into Unity axis system (left-handed).
pose3d.Set(aState.position, aState.orientation);
pose3d.SetRightHanded(pose3d.Matrix);
outState.orientation = pose3d.Orientation;
outState.position = pose3d.Position;
// For accelerometer, we have to flip Z because the GVR API has Z pointing backwards
// and Unity has Z pointing forward.
outState.accel = aState.acceleration;
outState.accel.z *= -1;
// Gyro in GVR represents a right-handed angular velocity about each axis (positive means
// clockwise when sighting along axis). Since Unity uses a left-handed system, we flip the
// signs to adjust the sign of the rotational velocity (so that positive means
// counter-clockwise). In addition, since in Unity the Z axis points forward while GVR
// has Z pointing backwards, we flip the Z axis sign again. So the result is that
// we should use -X, -Y, +Z:
outState.gyro = aState.gyro;
outState.gyro.Scale(new Vector3(-1, -1, 1));
outState.touchPos = aState.touchPos;
// Shim outputs centered touchpos coordinates, but the ControllerState struct is
// top-left coordinates. Convert back to top-left.
outState.touchPos.x = (outState.touchPos.x / 2.0f) + 0.5f;
outState.touchPos.y = (-outState.touchPos.y / 2.0f) + 0.5f;
outState.is6DoF = (aState.trackedDataAvailable &
(int)GvrShimTrackedDataAvailableFlags.PositionAvailable) != 0;
outState.buttonsState = (GvrControllerButton)aState.buttonState;
// Derive button up/down state from Unity perspective, as it can miss
// up/downs from platform, like on pause/resume.
if (controller_id >= 0 && controller_id < lastButtonStates.Length)
{
outState.SetButtonsUpDownFromPrevious(lastButtonStates[controller_id]);
lastButtonStates[controller_id] = outState.buttonsState;
}
outState.recentered = (aState.recentered != 0);
outState.isCharging = (aState.batteryCharging != 0);
outState.batteryLevel = (GvrControllerBatteryLevel)aState.batteryLevel;
}
