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diff --git a/src/3rdparty/resonance-audio/resonance_audio/geometrical_acoustics/parallel_for.h b/src/3rdparty/resonance-audio/resonance_audio/geometrical_acoustics/parallel_for.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_GEOMETRICAL_ACOUSTICS_PARALLEL_FOR_H_
+#define RESONANCE_AUDIO_GEOMETRICAL_ACOUSTICS_PARALLEL_FOR_H_
+
+#include <algorithm>
+#include <functional>
+#include <thread>
+
+namespace vraudio {
+
+// Gets the number of hardware threads; always returns more than zero.
+//
+// @return Number of hardware threads.
+inline unsigned int GetNumberOfHardwareThreads() {
+  // According to the standard, hardware_concurrency() may return zero if "this
+  // value is not computable or well defined". In that case, we want to have a
+  // thread count of one (instead of zero).
+  return std::max(1U, std::thread::hardware_concurrency());
+}
+
+// Repeatedly executes |function| multiple times, specified by |num_iterations|.
+// Different executions of |function| may occur on one of the |num_threads|
+// threads.
+//
+// |function| has a function signature of void(const size_t i), with |i| taking
+// values in the range [0, |num_iterations|).
+//
+// @param num_threads Number of threads to execute |function|.
+// @param num_iterations Number of iterations for this for loop.
+// @param function Function to be run. The function should take a single
+//     parameter that is of type const size_t, representing the iteration
+//     index, and no return value.
+void ParallelFor(unsigned int num_threads, size_t num_iterations,
+                 const std::function<void(const size_t)>& function);
+
+}  // namespace vraudio
+
+#endif  // RESONANCE_AUDIO_GEOMETRICAL_ACOUSTICS_PARALLEL_FOR_H_