Rename plugins to external

applications/external/airmouse/tracking/util/matrix_4x4.h

@@ -0,0 +1,37 @@
+/*
+ * 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_UTIL_MATRIX_4X4_H_
+#define CARDBOARD_SDK_UTIL_MATRIX_4X4_H_
+
+#include <array>
+
+namespace cardboard {
+
+class Matrix4x4 {
+public:
+    static Matrix4x4 Identity();
+    static Matrix4x4 Zeros();
+    static Matrix4x4 Translation(float x, float y, float z);
+    static Matrix4x4 Perspective(const std::array<float, 4>& fov, float zNear, float zFar);
+    void ToArray(float* array) const;
+
+private:
+    std::array<std::array<float, 4>, 4> m;
+};
+
+} // namespace cardboard
+
+#endif // CARDBOARD_SDK_UTIL_MATRIX4X4_H_