FlipMesh.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 "TransformMesh.hpp"
#include "Triangle.hpp"
 
namespace CeresEngine::MeshGenerator {
 
    template<typename Mesh> class FlipMesh {
    private:
        using Impl = TransformMesh<Mesh>;
        Impl mTransformMesh;
 
    public:
        class Triangles {
        public:
            [[nodiscard]] Triangle generate() const {
                Triangle triangle = mTriangles.generate();
                std::swap(triangle.vertices[0], triangle.vertices[2]);
                return triangle;
            }
 
            [[nodiscard]] bool done() const noexcept { return mTriangles.done(); }
 
            void next() { mTriangles.next(); }
 
        private:
            typename TriangleGeneratorType<TransformMesh<Mesh>>::Type mTriangles;
 
            Triangles(const TransformMesh<Mesh>& mesh) : mTriangles{mesh.triangles()} {}
 
            friend class FlipMesh;
        };
 
        FlipMesh(Mesh mesh)
                : mTransformMesh{std::move(mesh), [](MeshVertex& vertex) {
                                     vertex.normal *= -1.0;
                                 }} {}
 
        [[nodiscard]] Triangles triangles() const noexcept { return this->mTransformMesh; }
 
        using Vertices = typename Impl::Vertices;
        [[nodiscard]] Vertices vertices() const noexcept { return mTransformMesh.vertices(); }
    };
 
    template<typename Mesh> FlipMesh<Mesh> flipMesh(Mesh mesh) { return FlipMesh<Mesh>{std::move(mesh)}; }
 
} // namespace CeresEngine::MeshGenerator