spk_polygon.hpp

#pragma once
 
#include <vector>
 
namespace spk
{
    enum class PolygonOrder
    {
        TriangleFanFromFirst,
        TriangleStrip
    };

    template <typename TVertex>
    struct IPolygon
    {
        using Order = PolygonOrder;

        PolygonOrder order = PolygonOrder::TriangleFanFromFirst;
        std::vector<TVertex> points;

        static IPolygon<TVertex> makeTriangle(const TVertex &p_a, const TVertex &p_b, const TVertex &p_c)
        {
            return {.order = PolygonOrder::TriangleFanFromFirst, .points = {p_a, p_b, p_c}};
        }

        static IPolygon<TVertex> makeQuad(const TVertex &p_a, const TVertex &p_b, const TVertex &p_c, const TVertex &p_d, const PolygonOrder p_order = PolygonOrder::TriangleFanFromFirst)
        {
            return {.order = p_order, .points = {p_a, p_b, p_c, p_d}};
        }
    };
}