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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.1.0 (2010/04/14)
#ifndef CUBICINTERPOLATOR_H
#define CUBICINTERPOLATOR_H
#include "Wm5Memory.h"
#include "Wm5Tuple.h"
using namespace Wm5;
template <int N, typename Real>
class CubicInterpolator
{
public:
// Construction and destruction. A bool input is set to 'true' whenever
// the corresponding array was dynamically allocated and you want the
// class to own the array and deallocate it during class destruction.
// The inputs must be a strictly increasing sequence of numbers.
CubicInterpolator (int numSamples, Real* inputs, Tuple<N,Real>* outputs,
Tuple<N,Real>* tangents0, Tuple<N,Real>* tangents1, bool ownerInputs,
bool ownerOutputs, bool ownerTangents0, bool ownerTangents1);
CubicInterpolator (const std::string& filename);
~CubicInterpolator ();
// Member access.
inline int GetNumSamples () const;
inline const Real* GetInputs () const;
inline const Real* GetOutputs () const;
inline const Real* GetTangents0 () const;
inline const Real* GetTangents1 () const;
inline const Real GetMinInput () const;
inline const Real GetMaxInput () const;
// Evaluate the interpolator. The input is clamped to [min,max], where
// min = inputs[0] and max = inputs[numSamples-1].
Tuple<N,Real> operator() (Real input) const;
private:
// Support for constructors.
void Initialize ();
// Lookup on bounding keys.
void GetKeyInfo (Real input, Real& normInput, int& key) const;
// Constructor inputs.
int mNumSamples;
Real* mInputs;
Tuple<N,Real>* mOutputs;
Tuple<N,Real>* mTangents0;
Tuple<N,Real>* mTangents1;
bool mOwnerInputs, mOwnerOutputs, mOwnerTangents0, mOwnerTangents1;
// Support for key lookup and evaluation.
int mNumSamplesM1;
Real* mInvDeltas;
Tuple<N,Real>* mC0;
Tuple<N,Real>* mC1;
Tuple<N,Real>* mC2;
Tuple<N,Real>* mC3;
// For O(1) lookup on bounding keys.
mutable int mLastIndex;
};
#include "CubicInterpolator.inl"
#endif
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