TeapotMesh.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 "BezierMesh.hpp"
#include "MeshVertex.hpp"
#include "Triangle.hpp"
#include "Utility.hpp"
 
#include "CeresEngine/Foundation/SmartPtr.hpp"
 
#include <array>
 
namespace CeresEngine::MeshGenerator {
 
    class TeapotMesh {
    public:
        class Triangles {
        public:
            [[nodiscard]] bool done() const noexcept;
            [[nodiscard]] Triangle generate() const;
            void next();
 
        private:
            const TeapotMesh* mMesh;
            int mIndex;
            SPtr<const BezierMesh<4, 4>> mPatchMesh;
 
            typename TriangleGeneratorType<BezierMesh<4, 4>>::Type mTriangles;
 
            explicit Triangles(const TeapotMesh& mesh) noexcept;
 
            friend class TeapotMesh;
        };
 
        class Vertices {
        public:
            [[nodiscard]] bool done() const noexcept;
            [[nodiscard]] MeshVertex generate() const;
            void next();
 
        private:
            const TeapotMesh* mMesh;
 
            int mIndex;
 
            // Needs be a shared_ptr in order to make copy/move not to mess up the
            // internal pointer in mTriangles.
            SPtr<const BezierMesh<4, 4>> mPatchMesh;
 
            typename VertexGeneratorType<BezierMesh<4, 4>>::Type mVertices;
 
            explicit Vertices(const TeapotMesh& mesh) noexcept;
 
            friend class TeapotMesh;
        };
 
        explicit TeapotMesh(int segments = 8) noexcept;
 
        [[nodiscard]] Triangles triangles() const noexcept;
        [[nodiscard]] Vertices vertices() const noexcept;
 
    private:
        int mSegments;
 
        int mPatchVertexCount;
    };
 
} // namespace CeresEngine::MeshGenerator