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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#pragma once
+#ifndef AV_ANIMEVALUATOR_H_INCLUDED
+#define AV_ANIMEVALUATOR_H_INCLUDED
+
+/** Calculates a pose for a given time of an animation */
+
+#include <tuple>
+#include <vector>
+#include <assimp/matrix4x4.h>
+
+struct aiAnimation;
+
+namespace AssimpView {
+
+/**
+ *  @brief  Calculates transformations for a given timestamp from a set of animation tracks. Not directly useful,
+ *          better use the AnimPlayer class.
+ */
+class AnimEvaluator {
+public:
+    /// @brief  Constructor on a given animation. The animation is fixed throughout the lifetime of
+    /// the object.
+    /// @param pAnim    The animation to calculate poses for. Ownership of the animation object stays
+    ///                 at the caller, the evaluator just keeps a reference to it as long as it persists.
+    AnimEvaluator(const aiAnimation *pAnim);
+
+    /// @brief  The class destructor.
+    ~AnimEvaluator();
+
+    /// @brief Evaluates the animation tracks for a given time stamp.
+    /// The calculated pose can be retrieved as an array of transformation
+    /// matrices afterwards by calling GetTransformations().
+    /// @param pTime    The time for which you want to evaluate the animation, in seconds.
+    ///                 Will be mapped into the animation cycle, so it can get an arbitrary
+    ///                 value. Best use with ever-increasing time stamps.
+    void Evaluate(double pTime);
+
+    /// @brief  Returns the transform matrices calculated at the last Evaluate() call.
+    ///         The array matches the mChannels array of the aiAnimation.
+    const std::vector<aiMatrix4x4> &GetTransformations() const { return mTransforms; }
+
+private:
+    const aiAnimation *mAnim;
+    double mLastTime;
+    std::vector<std::tuple<unsigned int, unsigned int, unsigned int>> mLastPositions;
+    std::vector<aiMatrix4x4> mTransforms;
+};
+
+} // end of namespace AssimpView
+
+#endif // AV_ANIMEVALUATOR_H_INCLUDED