gradientfield.h

// Description: Gradient field for noise algorithms

#ifndef PASTELGFX_GRADIENTFIELD_H
#define PASTELGFX_GRADIENTFIELD_H

#include "pastel/sys/mytypes.h"
#include "pastel/sys/vector.h"

#include <vector>

namespace Pastel
{

        template <typename Real, integer N = 2>
        class GradientField
        {
        public:
            static GradientField<Real, N>& create();

            Real operator()(
                const Vector<integer, N>& position,
                const Vector<Real, N>& delta) const;

        private:
            GradientField();
            explicit GradientField(integer n);
            ~GradientField();

            void initialize(integer n);

            GradientField(const GradientField& that) = delete;
            GradientField<Real, N>& operator=(
                const GradientField& that) = delete;

            std::vector<integer> permutation_;
            integer permutationMask_;
            Real normalizationFactor_;
        };

        template <typename Real, integer N>
        GradientField<Real, N>& gradientField();

}

#include "pastel/gfx/noise/gradientfield.hpp"

#endif