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 /*
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 */
 
 /**
   * @file   anim.h
   * @brief  Defines the data structures in which the imported animations
   *         are returned.
   */
 #pragma once
 #ifndef AI_ANIM_H_INC
 #define AI_ANIM_H_INC
 
 #ifdef __GNUC__
 #pragma GCC system_header
 #endif
 
 #include <assimp/quaternion.h>
 #include <assimp/types.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 // ---------------------------------------------------------------------------
 /**
  */
 enum aiAnimInterpolation {
     /** */
     aiAnimInterpolation_Step,
 
     /** */
     aiAnimInterpolation_Linear,
 
     /** */
     aiAnimInterpolation_Spherical_Linear,
 
     /** */
     aiAnimInterpolation_Cubic_Spline,
 
 /** */
 #ifndef SWIG
     _aiAnimInterpolation_Force32Bit = INT_MAX
 #endif
 };
 
 // ---------------------------------------------------------------------------
 /** A time-value pair specifying a certain 3D vector for the given time. */
 struct aiVectorKey {
     /** The time of this key */
     double mTime;
 
     /** The value of this key */
     C_STRUCT aiVector3D mValue;
 
      /** The interpolation setting of this key */
     C_ENUM aiAnimInterpolation mInterpolation;
 
 #ifdef __cplusplus
 
     /// @brief  The default constructor.
     aiVectorKey() AI_NO_EXCEPT
             : mTime(0.0), mValue(), mInterpolation(aiAnimInterpolation_Linear) {}
 
     /// @brief  Construction from a given time and key value.
     aiVectorKey(double time, const aiVector3D &value) :
             mTime(time), mValue(value), mInterpolation(aiAnimInterpolation_Linear){}
 
     typedef aiVector3D elem_type;
 
     // Comparison operators. For use with std::find();
     bool operator==(const aiVectorKey &rhs) const {
         return rhs.mValue == this->mValue;
     }
 
     bool operator!=(const aiVectorKey &rhs) const {
         return rhs.mValue != this->mValue;
     }
 
     // Relational operators. For use with std::sort();
     bool operator<(const aiVectorKey &rhs) const {
         return mTime < rhs.mTime;
     }
 
     bool operator>(const aiVectorKey &rhs) const {
         return mTime > rhs.mTime;
     }
 #endif // __cplusplus
 };
 
 // ---------------------------------------------------------------------------
 /** A time-value pair specifying a rotation for the given time.
  *  Rotations are expressed with quaternions. */
 struct aiQuatKey {
     /** The time of this key */
     double mTime;
 
     /** The value of this key */
     C_STRUCT aiQuaternion mValue;
 
     /** The interpolation setting of this key */
     C_ENUM aiAnimInterpolation mInterpolation;
 
 #ifdef __cplusplus
     aiQuatKey() AI_NO_EXCEPT
             : mTime(0.0), mValue(), mInterpolation(aiAnimInterpolation_Linear) {}
 
     /** Construction from a given time and key value */
     aiQuatKey(double time, const aiQuaternion &value) :
             mTime(time), mValue(value), mInterpolation(aiAnimInterpolation_Linear) {}
 
     typedef aiQuaternion elem_type;
 
     // Comparison operators. For use with std::find();
     bool operator==(const aiQuatKey &rhs) const {
         return rhs.mValue == this->mValue;
     }
 
     bool operator!=(const aiQuatKey &rhs) const {
         return rhs.mValue != this->mValue;
     }
 
     // Relational operators. For use with std::sort();
     bool operator<(const aiQuatKey &rhs) const {
         return mTime < rhs.mTime;
     }
 
     bool operator>(const aiQuatKey &rhs) const {
         return mTime > rhs.mTime;
     }
 #endif
 };
 
 // ---------------------------------------------------------------------------
 /** Binds a anim-mesh to a specific point in time. */
 struct aiMeshKey {
     /** The time of this key */
     double mTime;
 
     /** Index into the aiMesh::mAnimMeshes array of the
      *  mesh corresponding to the #aiMeshAnim hosting this
      *  key frame. The referenced anim mesh is evaluated
      *  according to the rules defined in the docs for #aiAnimMesh.*/
     unsigned int mValue;
 
 #ifdef __cplusplus
 
     aiMeshKey() AI_NO_EXCEPT
             : mTime(0.0),
               mValue(0) {
     }
 
     /** Construction from a given time and key value */
     aiMeshKey(double time, const unsigned int value) :
             mTime(time), mValue(value) {}
 
     typedef unsigned int elem_type;
 
     // Comparison operators. For use with std::find();
     bool operator==(const aiMeshKey &o) const {
         return o.mValue == this->mValue;
     }
     bool operator!=(const aiMeshKey &o) const {
         return o.mValue != this->mValue;
     }
 
     // Relational operators. For use with std::sort();
     bool operator<(const aiMeshKey &o) const {
         return mTime < o.mTime;
     }
     bool operator>(const aiMeshKey &o) const {
         return mTime > o.mTime;
     }
 
 #endif
 };
 
 // ---------------------------------------------------------------------------
 /** Binds a morph anim mesh to a specific point in time. */
 struct aiMeshMorphKey {
     /** The time of this key */
     double mTime;
 
     /** The values and weights at the time of this key
      *   - mValues: index of attachment mesh to apply weight at the same position in mWeights
      *   - mWeights: weight to apply to the blend shape index at the same position in mValues
      */
     unsigned int *mValues;
     double *mWeights;
 
     /** The number of values and weights */
     unsigned int mNumValuesAndWeights;
 #ifdef __cplusplus
     aiMeshMorphKey() AI_NO_EXCEPT
             : mTime(0.0),
               mValues(nullptr),
               mWeights(nullptr),
               mNumValuesAndWeights(0) {
     }
 
     ~aiMeshMorphKey() {
         if (mNumValuesAndWeights && mValues && mWeights) {
             delete[] mValues;
             delete[] mWeights;
         }
     }
 #endif
 };
 
 // ---------------------------------------------------------------------------
 /** Defines how an animation channel behaves outside the defined time
  *  range. This corresponds to aiNodeAnim::mPreState and
  *  aiNodeAnim::mPostState.*/
 enum aiAnimBehaviour {
     /** The value from the default node transformation is taken*/
     aiAnimBehaviour_DEFAULT = 0x0,
 
     /** The nearest key value is used without interpolation */
     aiAnimBehaviour_CONSTANT = 0x1,
 
     /** The value of the nearest two keys is linearly
      *  extrapolated for the current time value.*/
     aiAnimBehaviour_LINEAR = 0x2,
 
     /** The animation is repeated.
      *
      *  If the animation key go from n to m and the current
      *  time is t, use the value at (t-n) % (|m-n|).*/
     aiAnimBehaviour_REPEAT = 0x3,
 
 /** This value is not used, it is just here to force the
      *  the compiler to map this enum to a 32 Bit integer  */
 #ifndef SWIG
     _aiAnimBehaviour_Force32Bit = INT_MAX
 #endif
 };
 
 // ---------------------------------------------------------------------------
 /** Describes the animation of a single node. The name specifies the
  *  bone/node which is affected by this animation channel. The keyframes
  *  are given in three separate series of values, one each for position,
  *  rotation and scaling. The transformation matrix computed from these
  *  values replaces the node's original transformation matrix at a
  *  specific time.
  *  This means all keys are absolute and not relative to the bone default pose.
  *  The order in which the transformations are applied is
  *  - as usual - scaling, rotation, translation.
  *
  *  @note All keys are returned in their correct, chronological order.
  *  Duplicate keys don't pass the validation step. Most likely there
  *  will be no negative time values, but they are not forbidden also ( so
  *  implementations need to cope with them! ) */
 struct aiNodeAnim {
     /** The name of the node affected by this animation. The node
      *  must exist and it must be unique.*/
     C_STRUCT aiString mNodeName;
 
     /** The number of position keys */
     unsigned int mNumPositionKeys;
 
     /** The position keys of this animation channel. Positions are
      * specified as 3D vector. The array is mNumPositionKeys in size.
      *
      * If there are position keys, there will also be at least one
      * scaling and one rotation key.*/
     C_STRUCT aiVectorKey *mPositionKeys;
 
     /** The number of rotation keys */
     unsigned int mNumRotationKeys;
 
     /** The rotation keys of this animation channel. Rotations are
      *  given as quaternions,  which are 4D vectors. The array is
      *  mNumRotationKeys in size.
      *
      * If there are rotation keys, there will also be at least one
      * scaling and one position key. */
     C_STRUCT aiQuatKey *mRotationKeys;
 
     /** The number of scaling keys */
     unsigned int mNumScalingKeys;
 
     /** The scaling keys of this animation channel. Scalings are
      *  specified as 3D vector. The array is mNumScalingKeys in size.
      *
      * If there are scaling keys, there will also be at least one
      * position and one rotation key.*/
     C_STRUCT aiVectorKey *mScalingKeys;
 
     /** Defines how the animation behaves before the first
      *  key is encountered.
      *
      *  The default value is aiAnimBehaviour_DEFAULT (the original
      *  transformation matrix of the affected node is used).*/
     C_ENUM aiAnimBehaviour mPreState;
 
     /** Defines how the animation behaves after the last
      *  key was processed.
      *
      *  The default value is aiAnimBehaviour_DEFAULT (the original
      *  transformation matrix of the affected node is taken).*/
     C_ENUM aiAnimBehaviour mPostState;
 
 #ifdef __cplusplus
     aiNodeAnim() AI_NO_EXCEPT
             : mNumPositionKeys(0),
               mPositionKeys(nullptr),
               mNumRotationKeys(0),
               mRotationKeys(nullptr),
               mNumScalingKeys(0),
               mScalingKeys(nullptr),
               mPreState(aiAnimBehaviour_DEFAULT),
               mPostState(aiAnimBehaviour_DEFAULT) {
         // empty
     }
 
     ~aiNodeAnim() {
         delete[] mPositionKeys;
         delete[] mRotationKeys;
         delete[] mScalingKeys;
     }
 #endif // __cplusplus
 };
 
 // ---------------------------------------------------------------------------
 /** Describes vertex-based animations for a single mesh or a group of
  *  meshes. Meshes carry the animation data for each frame in their
  *  aiMesh::mAnimMeshes array. The purpose of aiMeshAnim is to
  *  define keyframes linking each mesh attachment to a particular
  *  point in time. */
 struct aiMeshAnim {
     /** Name of the mesh to be animated. An empty string is not allowed,
      *  animated meshes need to be named (not necessarily uniquely,
      *  the name can basically serve as wild-card to select a group
      *  of meshes with similar animation setup)*/
     C_STRUCT aiString mName;
 
     /** Size of the #mKeys array. Must be 1, at least. */
     unsigned int mNumKeys;
 
     /** Key frames of the animation. May not be nullptr. */
     C_STRUCT aiMeshKey *mKeys;
 
 #ifdef __cplusplus
 
     aiMeshAnim() AI_NO_EXCEPT
             : mNumKeys(),
               mKeys() {}
 
     ~aiMeshAnim() {
         delete[] mKeys;
     }
 
 #endif
 };
 
 // ---------------------------------------------------------------------------
 /** Describes a morphing animation of a given mesh. */
 struct aiMeshMorphAnim {
     /** Name of the mesh to be animated. An empty string is not allowed,
      *  animated meshes need to be named (not necessarily uniquely,
      *  the name can basically serve as wildcard to select a group
      *  of meshes with similar animation setup)*/
     C_STRUCT aiString mName;
 
     /** Size of the #mKeys array. Must be 1, at least. */
     unsigned int mNumKeys;
 
     /** Key frames of the animation. May not be nullptr. */
     C_STRUCT aiMeshMorphKey *mKeys;
 
 #ifdef __cplusplus
 
     aiMeshMorphAnim() AI_NO_EXCEPT
             : mNumKeys(),
               mKeys() {}
 
     ~aiMeshMorphAnim() {
         delete[] mKeys;
     }
 
 #endif
 };
 
 // ---------------------------------------------------------------------------
 /** An animation consists of key-frame data for a number of nodes. For
  *  each node affected by the animation a separate series of data is given.*/
 struct aiAnimation {
     /** The name of the animation. If the modeling package this data was
      *  exported from does support only a single animation channel, this
      *  name is usually empty (length is zero). */
     C_STRUCT aiString mName;
 
     /** Duration of the animation in ticks.  */
     double mDuration;
 
     /** Ticks per second. 0 if not specified in the imported file */
     double mTicksPerSecond;
 
     /** The number of bone animation channels. Each channel affects
      *  a single node. */
     unsigned int mNumChannels;
 
     /** The node animation channels. Each channel affects a single node.
      *  The array is mNumChannels in size. */
     C_STRUCT aiNodeAnim **mChannels;
 
     /** The number of mesh animation channels. Each channel affects
      *  a single mesh and defines vertex-based animation. */
     unsigned int mNumMeshChannels;
 
     /** The mesh animation channels. Each channel affects a single mesh.
      *  The array is mNumMeshChannels in size. */
     C_STRUCT aiMeshAnim **mMeshChannels;
 
     /** The number of mesh animation channels. Each channel affects
      *  a single mesh and defines morphing animation. */
     unsigned int mNumMorphMeshChannels;
 
     /** The morph mesh animation channels. Each channel affects a single mesh.
      *  The array is mNumMorphMeshChannels in size. */
     C_STRUCT aiMeshMorphAnim **mMorphMeshChannels;
 
 #ifdef __cplusplus
     aiAnimation() AI_NO_EXCEPT
             : mDuration(-1.),
               mTicksPerSecond(0.),
               mNumChannels(0),
               mChannels(nullptr),
               mNumMeshChannels(0),
               mMeshChannels(nullptr),
               mNumMorphMeshChannels(0),
               mMorphMeshChannels(nullptr) {
         // empty
     }
 
     ~aiAnimation() {
         // DO NOT REMOVE THIS ADDITIONAL CHECK
         if (mNumChannels && mChannels) {
             for (unsigned int a = 0; a < mNumChannels; a++) {
                 delete mChannels[a];
             }
 
             delete[] mChannels;
         }
         if (mNumMeshChannels && mMeshChannels) {
             for (unsigned int a = 0; a < mNumMeshChannels; a++) {
                 delete mMeshChannels[a];
             }
 
             delete[] mMeshChannels;
         }
         if (mNumMorphMeshChannels && mMorphMeshChannels) {
             for (unsigned int a = 0; a < mNumMorphMeshChannels; a++) {
                 delete mMorphMeshChannels[a];
             }
 
             delete[] mMorphMeshChannels;
         }
     }
 #endif // __cplusplus
 };
 
 #ifdef __cplusplus
 }
 
 /// @brief  Some C++ utilities for inter- and extrapolation
 namespace Assimp {
 
 // ---------------------------------------------------------------------------
 /**
   * @brief CPP-API: Utility class to simplify interpolations of various data types.
   *
   *  The type of interpolation is chosen automatically depending on the
   *  types of the arguments.
   */
 template <typename T>
 struct Interpolator {
     // ------------------------------------------------------------------
     /** @brief Get the result of the interpolation between a,b.
      *
      *  The interpolation algorithm depends on the type of the operands.
      *  aiQuaternion's and aiQuatKey's SLERP, the rest does a simple
      *  linear interpolation. */
     void operator()(T &anim_out, const T &a, const T &b, ai_real d) const {
         anim_out = a + (b - a) * d;
     }
 }; // ! Interpolator <T>
 
 //! @cond Never
 
 template <>
 struct Interpolator<aiQuaternion> {
     void operator()(aiQuaternion &out, const aiQuaternion &a,
             const aiQuaternion &b, ai_real d) const {
         aiQuaternion::Interpolate(out, a, b, d);
     }
 }; // ! Interpolator <aiQuaternion>
 
 template <>
 struct Interpolator<unsigned int> {
     void operator()(unsigned int &out, unsigned int a,
             unsigned int b, ai_real d) const {
         out = d > 0.5f ? b : a;
     }
 }; // ! Interpolator <aiQuaternion>
 
 template <>
 struct Interpolator<aiVectorKey> {
     void operator()(aiVector3D &out, const aiVectorKey &a,
             const aiVectorKey &b, ai_real d) const {
         Interpolator<aiVector3D> ipl;
         ipl(out, a.mValue, b.mValue, d);
     }
 }; // ! Interpolator <aiVectorKey>
 
 template <>
 struct Interpolator<aiQuatKey> {
     void operator()(aiQuaternion &out, const aiQuatKey &a,
             const aiQuatKey &b, ai_real d) const {
         Interpolator<aiQuaternion> ipl;
         ipl(out, a.mValue, b.mValue, d);
     }
 }; // ! Interpolator <aiQuatKey>
 
 template <>
 struct Interpolator<aiMeshKey> {
     void operator()(unsigned int &out, const aiMeshKey &a,
             const aiMeshKey &b, ai_real d) const {
         Interpolator<unsigned int> ipl;
         ipl(out, a.mValue, b.mValue, d);
     }
 }; // ! Interpolator <aiQuatKey>
 
 //! @endcond
 
 } // namespace Assimp
 
 #endif // __cplusplus
 
 #endif // AI_ANIM_H_INC

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