triangle_filter.h

// Description: Triangle_Filter class
// Detail: Triangle reconstruction filter
// Documentation: filters.txt

#ifndef PASTELGFX_TRIANGLE_FILTER_H
#define PASTELGFX_TRIANGLE_FILTER_H

#include "pastel/gfx/filter.h"

#include <cmath>

namespace Pastel
{

    class Triangle_Filter
        : public Filter
    {
    public:
        // Using default constructor.
        // Using default copy constructor.
        // Using default assignment.

        Triangle_Filter()
        : Filter(1, "triangle")
        {
        }

        virtual ~Triangle_Filter()
        {
        }

        virtual real evaluateInRange(real x) const
        {
            return 1 - std::abs(x);
        }

    private:
        Triangle_Filter(const Triangle_Filter& that) = delete;
        Triangle_Filter& operator=(const Triangle_Filter& that) = delete;
    };

    using TriangleFilterPtr = std::shared_ptr<Triangle_Filter>;
    using ConstTriangleFilterPtr = std::shared_ptr<const Triangle_Filter>;

    inline TriangleFilterPtr triangleFilter()
    {
        return std::make_shared<Triangle_Filter>();
    }

}

#endif