Curve.h

/*
 * Copyright (c) 2008-2017, NVIDIA CORPORATION.  All rights reserved.
 *
 * NVIDIA CORPORATION and its licensors retain all intellectual property
 * and proprietary rights in and to this software, related documentation
 * and any modifications thereto.  Any use, reproduction, disclosure or
 * distribution of this software and related documentation without an express
 * license agreement from NVIDIA CORPORATION is strictly prohibited.
 */


#ifndef CURVE_H
#define CURVE_H

#include "Apex.h"
#include "nvparameterized/NvParameterized.h"

namespace nvidia
{
namespace apex
{

PX_PUSH_PACK_DEFAULT

template <typename T>
struct Vec2T
{
    Vec2T(T _x = T(), T _y = T()) : x(_x), y(_y) { }

    T x;
    T y;

    T& operator[](uint32_t ndx)
    {
        PX_ASSERT(ndx < 2);
        return ((T*)&x)[ndx];
    }
};

typedef Vec2T<float> Vec2R;

class Curve
{
public:
    virtual ~Curve() {}

    virtual float evaluate(float x) const = 0;

    virtual uint32_t addControlPoint(const Vec2R& controlPoint) = 0;

    virtual void addControlPoints(::NvParameterized::Interface* param, ::NvParameterized::Handle& hPoints) = 0;

    virtual bool calculateControlPoints(float x, Vec2R& outXPoints, Vec2R& outYPoints) const = 0;

    virtual uint32_t calculateFollowingControlPoint(float xValue) const = 0;

    virtual const Vec2R* getControlPoints(uint32_t& outCount) const = 0;
};

PX_POP_PACK

}
} // namespace apex

#endif // CURVE_H