Rename plugins to external

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

@@ -0,0 +1,65 @@
+/*
+ * 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_MATRIXUTILS_H_
+#define CARDBOARD_SDK_UTIL_MATRIXUTILS_H_
+
+//
+// This file contains operators and free functions that define generic Matrix
+// operations.
+//
+
+#include "matrix_3x3.h"
+#include "rotation.h"
+#include "vector.h"
+
+namespace cardboard {
+
+// Returns the transpose of a matrix.
+Matrix3x3 Transpose(const Matrix3x3& m);
+
+// Multiplies a Matrix and a column Vector of the same Dimension to produce
+// another column Vector.
+Vector3 operator*(const Matrix3x3& m, const Vector3& v);
+
+// Returns the determinant of the matrix. This function is defined for all the
+// typedef'ed Matrix types.
+double Determinant(const Matrix3x3& m);
+
+// Returns the adjugate of the matrix, which is defined as the transpose of the
+// cofactor matrix. This function is defined for all the typedef'ed Matrix
+// types.  The determinant of the matrix is computed as a side effect, so it is
+// returned in the determinant parameter if it is not null.
+Matrix3x3 AdjugateWithDeterminant(const Matrix3x3& m, double* determinant);
+
+// Returns the inverse of the matrix. This function is defined for all the
+// typedef'ed Matrix types.  The determinant of the matrix is computed as a
+// side effect, so it is returned in the determinant parameter if it is not
+// null. If the determinant is 0, the returned matrix has all zeroes.
+Matrix3x3 InverseWithDeterminant(const Matrix3x3& m, double* determinant);
+
+// Returns the inverse of the matrix. This function is defined for all the
+// typedef'ed Matrix types. If the determinant of the matrix is 0, the returned
+// matrix has all zeroes.
+Matrix3x3 Inverse(const Matrix3x3& m);
+
+// Returns a 3x3 Matrix representing a 3D rotation. This creates a Matrix that
+// does not work with homogeneous coordinates, so the function name ends in
+// "NH".
+Matrix3x3 RotationMatrixNH(const Rotation& r);
+
+} // namespace cardboard
+
+#endif // CARDBOARD_SDK_UTIL_MATRIXUTILS_H_