TransformMesh.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 "MeshVertex.hpp"
#include "Utility.hpp"
 
#include "CeresEngine/Foundation/Function.hpp"
 
namespace CeresEngine::MeshGenerator {
 
    template<typename Mesh> class TransformMesh {
    private:
        using Impl = Mesh;
        Impl mMesh;
 
    public:
        class Vertices {
        public:
            [[nodiscard]] MeshVertex generate() const {
                auto vertex = vertices_.generate();
                mMesh->mutate_(vertex);
                return vertex;
            }
 
            [[nodiscard]] bool done() const noexcept { return vertices_.done(); }
 
            void next() { vertices_.next(); }
 
        private:
            const TransformMesh* mMesh;
 
            typename VertexGeneratorType<Mesh>::Type vertices_;
 
            explicit Vertices(const TransformMesh& mesh) : mMesh{&mesh}, vertices_{mesh.mMesh.vertices()} {}
 
            friend class TransformMesh;
        };
 
        explicit TransformMesh(Mesh mesh, Function<void(MeshVertex&) const> mutate) : mMesh{std::move(mesh)}, mutate_{std::move(mutate)} {}
 
        using Triangles = typename Impl::Triangles;
 
        [[nodiscard]] Triangles triangles() const noexcept { return mMesh.triangles(); }
        [[nodiscard]] Vertices vertices() const noexcept { return Vertices{*this}; }
 
    private:
        Function<void(MeshVertex&) const> mutate_;
    };
 
    template<typename Mesh> TransformMesh<Mesh> transformMesh(Mesh mesh, Function<void(MeshVertex&) const> mutate) {
        return TransformMesh<Mesh>{std::move(mesh), std::move(mutate)};
    }
 
} // namespace CeresEngine::MeshGenerator