SurfaceSet2.h

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/*************************************************************************
> File Name: SurfaceSet2.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 2-D surface set.
> Created Time: 2017/04/04
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_SURFACE_SET2_H
#define CUBBYFLOW_SURFACE_SET2_H

#include <Core/Geometry/BVH2.h>
#include <Core/Surface/Surface2.h>

#include <vector>

namespace CubbyFlow
{
    class SurfaceSet2 final : public Surface2
    {
    public:
        class Builder;

        SurfaceSet2();

        explicit SurfaceSet2(
            const std::vector<Surface2Ptr>& others,
            const Transform2& transform = Transform2(),
            bool isNormalFlipped = false);

        SurfaceSet2(const SurfaceSet2& other);

        void UpdateQueryEngine() override;

        size_t NumberOfSurfaces() const;

        const Surface2Ptr& SurfaceAt(size_t i) const;

        void AddSurface(const Surface2Ptr& surface);

        static Builder GetBuilder();

    private:
        std::vector<Surface2Ptr> m_surfaces;
        mutable BVH2<Surface2Ptr> m_bvh;
        mutable bool m_bvhInvalidated = true;

        // Surface2 implementations
        Vector2D ClosestPointLocal(const Vector2D& otherPoint) const override;
        
        BoundingBox2D BoundingBoxLocal() const override;
        
        double ClosestDistanceLocal(const Vector2D& otherPoint) const override;

        bool IntersectsLocal(const Ray2D& ray) const override;

        Vector2D ClosestNormalLocal(const Vector2D& otherPoint) const override;

        SurfaceRayIntersection2 ClosestIntersectionLocal(const Ray2D& ray) const override;

        void InvalidateBVH() const;
        
        void BuildBVH() const;
    };

    using SurfaceSet2Ptr = std::shared_ptr<SurfaceSet2>;

    class SurfaceSet2::Builder final : public SurfaceBuilderBase2<SurfaceSet2>
    {
    public:
        Builder& WithSurfaces(const std::vector<Surface2Ptr>& others);

        SurfaceSet2 Build() const;

        SurfaceSet2Ptr MakeShared() const;

    private:
        std::vector<Surface2Ptr> m_surfaces;
    };
}

#endif