bounding-volume.hpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ANTKEEPER_GEOM_BOUNDING_VOLUME_HPP
#define ANTKEEPER_GEOM_BOUNDING_VOLUME_HPP
 
#include <engine/math/vector.hpp>
#include <stdexcept>
 
namespace geom {
 
template <class T>
struct sphere;
template <class T>
struct aabb;
 
enum class bounding_volume_type
{
    aabb, 
    sphere, 
    convex_hull 
};
 
template <class T>
class bounding_volume
{
public:
    virtual bounding_volume_type get_bounding_volume_type() const = 0;
    
    virtual bool intersects(const sphere<T>& sphere) const = 0;
    
    virtual bool intersects(const aabb<T>& aabb) const = 0;
    
    virtual bool contains(const sphere<T>& sphere) const = 0;
    
    virtual bool contains(const aabb<T>& aabb) const = 0;
    
    virtual bool contains(const math::vector<T, 3>& point) const = 0;
    
    bool intersects(const bounding_volume& volume) const;
};
 
template <class T>
bool bounding_volume<T>::intersects(const bounding_volume& volume) const
{
    const bounding_volume_type type = volume.get_bounding_volume_type();
    switch (type)
    {
        case bounding_volume_type::sphere:
            return intersects(static_cast<const sphere<T>&>(volume));
            break;
        
        case bounding_volume_type::aabb:
            return intersects(static_cast<const aabb<T>&>(volume));
            break;
        
        default:
            throw std::runtime_error("unimplemented");
            break;
    }
}
 
} // namespace geom
 
#endif // ANTKEEPER_GEOM_BOUNDING_VOLUME_HPP