object.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_SCENE_OBJECT_HPP
#define ANTKEEPER_SCENE_OBJECT_HPP
 
#include <engine/geom/primitives/box.hpp>
#include <engine/math/vector.hpp>
#include <engine/math/quaternion.hpp>
#include <engine/math/transform.hpp>
#include <engine/render/context.hpp>
#include <atomic>
#include <cstdint>
 
namespace scene {
 
class object_base
{
public:
    using vector_type = math::fvec3;
    using quaternion_type = math::fquat;
    using transform_type = math::transform<float>;
    using aabb_type = geom::box<float>;
    
    [[nodiscard]] virtual const std::size_t get_object_type_id() const noexcept = 0;
    
    inline virtual void render(render::context& ctx) const {}
    
    void look_at(const vector_type& position, const vector_type& target, const vector_type& up);
    
    inline constexpr void set_layer_mask(std::uint32_t mask) noexcept
    {
        m_layer_mask = mask;
    }
    
    inline void set_transform(const transform_type& transform)
    {
        m_transform = transform;
        transformed();
    }
 
    inline void set_translation(const vector_type& translation)
    {
        m_transform.translation = translation;
        transformed();
    }
    
    inline void set_rotation(const quaternion_type& rotation)
    {
        m_transform.rotation = rotation;
        transformed();
    }
    
    inline void set_scale(const vector_type& scale)
    {
        m_transform.scale = scale;
        transformed();
    }
    inline void set_scale(float scale)
    {
        m_transform.scale = {scale, scale, scale};
        transformed();
    }
    
    [[nodiscard]] inline constexpr std::uint32_t get_layer_mask() const noexcept
    {
        return m_layer_mask;
    }
 
    [[nodiscard]] inline constexpr const transform_type& get_transform() const noexcept
    {
        return m_transform;
    }
 
    [[nodiscard]] inline constexpr const vector_type& get_translation() const noexcept
    {
        return m_transform.translation;
    }
 
    [[nodiscard]] inline constexpr const quaternion_type& get_rotation() const noexcept
    {
        return m_transform.rotation;
    }
 
    [[nodiscard]] inline constexpr const vector_type& get_scale() const noexcept
    {
        return m_transform.scale;
    }
    
    [[nodiscard]] virtual const aabb_type& get_bounds() const noexcept = 0;
 
protected:
    static std::size_t next_object_type_id();
    
    inline virtual void transformed() {}
    
    std::uint32_t m_layer_mask{1};
    transform_type m_transform{transform_type::identity()};
};
 
template <class T>
class object: public object_base
{
public:
    static const std::atomic<std::size_t> object_type_id;
    
    [[nodiscard]] inline const std::size_t get_object_type_id() const noexcept final
    {
        return object_type_id;
    }
};
 
template <typename T>
const std::atomic<std::size_t> object<T>::object_type_id{object_base::next_object_type_id()};
 
} // namespace scene
 
#endif // ANTKEEPER_SCENE_OBJECT_HPP