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diff --git a/src/3rdparty/resonance-audio/platforms/common/utils.h b/src/3rdparty/resonance-audio/platforms/common/utils.h
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+/*
+Copyright 2018 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 RESONANCE_AUDIO_PLATFORM_COMMON_UTILS_H_
+#define RESONANCE_AUDIO_PLATFORM_COMMON_UTILS_H_
+
+#include "Eigen/Dense"
+
+namespace vraudio {
+
+// Flips the z-axis of a transformation matrix, which effectively allows
+// switching between the left-handed and right-handed coordinate systems.
+//
+// @param matrix 4x4 transformation matrix.
+// @return 4x4 transformation matrix with the z-axis flipped.
+void FlipZAxis(Eigen::Matrix4f* matrix);
+
+// Returns the position vector of a transformation matrix.
+//
+// @param matrix 4x4 transformation matrix.
+// @return 3D position vector.
+Eigen::Vector3f GetPosition(const Eigen::Matrix4f& matrix);
+
+// Returns the rotation quaternion of a transformation matrix.
+//
+// @param matrix 4x4 transformation matrix.
+// @return Quaternion representation of the rotation.
+Eigen::Quaternionf GetQuaternion(const Eigen::Matrix4f& matrix);
+
+// Returns a transformation matrix from position, forward & up vectors.
+//
+// @param position Position vector.
+// @param forward Forward direction vector describing rotation.
+// @param up Up direction vector describing rotation.
+// @return 4x4 transformation matrix.
+Eigen::Matrix4f GetTransformMatrix(const Eigen::Vector3f& position,
+                                   const Eigen::Vector3f& forward,
+                                   const Eigen::Vector3f& up);
+
+}  // namespace vraudio
+
+#endif  // RESONANCE_AUDIO_PLATFORM_COMMON_UTILS_H_