Revert "Revert "Air Mouse""

This reverts commit bbc0888b45.

applications/plugins/airmouse/tracking/sensors/pose_state.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef CARDBOARD_SDK_SENSORS_POSE_STATE_H_
+#define CARDBOARD_SDK_SENSORS_POSE_STATE_H_
+
+#include "../util/rotation.h"
+#include "../util/vector.h"
+
+namespace cardboard {
+
+enum {
+    kPoseStateFlagInvalid = 1U << 0,
+    kPoseStateFlagInitializing = 1U << 1,
+    kPoseStateFlagHas6DoF = 1U << 2,
+};
+
+// Stores a head pose pose plus derivatives. This can be used for prediction.
+struct PoseState {
+    // System wall time.
+    int64_t timestamp;
+
+    // Rotation from Sensor Space to Start Space.
+    Rotation sensor_from_start_rotation;
+
+    // First derivative of the rotation.
+    Vector3 sensor_from_start_rotation_velocity;
+
+    // Current gyroscope bias in rad/s.
+    Vector3 bias;
+
+    // The position of the headset.
+    Vector3 position = Vector3(0, 0, 0);
+
+    // In the same coordinate frame as the position.
+    Vector3 velocity = Vector3(0, 0, 0);
+
+    // Flags indicating the status of the pose.
+    uint64_t flags = 0U;
+};
+
+} // namespace cardboard
+
+#endif // CARDBOARD_SDK_SENSORS_POSE_STATE_H_