FlipPath.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "Edge.hpp"
#include "TransformPath.hpp"
 
namespace CeresEngine::MeshGenerator {
 
    template<typename Path> class FlipPath {
    private:
        using Impl = TransformPath<Path>;
        Impl mTransformPath;
 
    public:
        class Edges {
        public:
            [[nodiscard]] Edge generate() const {
                Edge edge = mEdges.generate();
                std::swap(edge.vertices[0], edge.vertices[1]);
                return edge;
            }
 
            [[nodiscard]] bool done() const noexcept { return mEdges.done(); }
 
            void next() { mEdges.next(); }
 
        private:
            typename EdgeGeneratorType<TransformPath<Path>>::Type mEdges;
 
            Edges(const TransformPath<Path>& path) : mEdges{path.edges()} {}
 
            friend class FlipPath;
        };
 
        FlipPath(Path path)
                : mTransformPath{std::move(path), [](PathVertex& vertex) {
                                     vertex.tangent *= -1.0;
                                     vertex.normal *= -1.0;
                                 }} {}
 
        [[nodiscard]] Edges edges() const noexcept { return {*this}; }
 
        using Vertices = typename Impl::Vertices;
        [[nodiscard]] Vertices vertices() const noexcept { return mTransformPath.vertices(); }
    };
 
    template<typename Path> FlipPath<Path> flipPath(Path path) { return FlipPath<Path>{std::move(path)}; }
 
} // namespace CeresEngine::MeshGenerator