💿🐜 Antkeeper source code https://antkeeper.com
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/*
* Copyright (C) 2021 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 "animation/tween.hpp"
#include "geometry/bounding-volume.hpp"
#include "math/vector-type.hpp"
#include "math/quaternion-type.hpp"
#include "math/transform-type.hpp"
#include <atomic>
#include <cstdlib>
namespace scene {
/**
* Internal base class for scene objects.
*/
class object_base
{
public:
typedef math::vector<float, 3> vector_type;
typedef math::quaternion<float> quaternion_type;
typedef math::transform<float> transform_type;
typedef bounding_volume<float> bounding_volume_type;
/// Returns the type ID for this scene object type.
virtual const std::size_t get_object_type_id() const = 0;
/**
* Creates a scene object base.
*/
object_base();
/**
* Destroys a scene object base.
*/
virtual ~object_base() = default;
/**
* Updates all tweens in the scene object.
*/
virtual void update_tweens();
/**
* Activates or deactivates the scene object.
*/
void set_active(bool active);
/**
*
*/
void look_at(const vector_type& position, const vector_type& target, const vector_type& up);
/**
* Sets the scene object's transform.
*/
void set_transform(const transform_type& transform);
/**
* Sets the scene object's translation.
*/
void set_translation(const vector_type& translation);
/**
* Sets the scene object's rotation.
*/
void set_rotation(const quaternion_type& rotation);
/**
* Sets the scene object's scale.
*/
void set_scale(const vector_type& scale);
/**
* Sets a culling mask for the object, which will be used for view-frustum culling instead of the object's bounds.
*/
void set_culling_mask(const bounding_volume_type* culling_mask);
/// Returns whether the scene object is active.
bool is_active() const;
/**
* Returns the transform.
*/
const transform_type& get_transform() const;
/**
* Returns the transform's translation vector.
*/
const vector_type& get_translation() const;
/**
* Returns the transform's rotation quaternion.
*/
const quaternion_type& get_rotation() const;
/**
* Returns the transform's scale vector.
*/
const vector_type& get_scale() const;
/**
* Returns the transform tween.
*/
const tween<transform_type>& get_transform_tween() const;
tween<transform_type>& get_transform_tween();
/**
* Returns the bounds of the object.
*/
virtual const bounding_volume_type& get_bounds() const = 0;
/**
* Returns the culling mask of the object.
*/
const bounding_volume_type* get_culling_mask() const;
protected:
static std::size_t next_object_type_id();
private:
/// Interpolates between two transforms.
static transform_type interpolate_transforms(const transform_type& x, const transform_type& y, float a);
/**
* Called every time the scene object's tranform is changed.
*/
virtual void transformed();
bool active;
tween<transform_type> transform;
const bounding_volume_type* culling_mask;
};
inline void object_base::set_active(bool active)
{
this->active = active;
}
inline void object_base::set_transform(const transform_type& transform)
{
this->transform[1] = transform;
transformed();
}
inline void object_base::set_translation(const vector_type& translation)
{
transform[1].translation = translation;
transformed();
}
inline void object_base::set_rotation(const quaternion_type& rotation)
{
transform[1].rotation = rotation;
transformed();
}
inline void object_base::set_scale(const vector_type& scale)
{
transform[1].scale = scale;
transformed();
}
inline bool object_base::is_active() const
{
return active;
}
inline const typename object_base::transform_type& object_base::get_transform() const
{
return transform[1];
}
inline const typename object_base::vector_type& object_base::get_translation() const
{
return get_transform().translation;
}
inline const typename object_base::quaternion_type& object_base::get_rotation() const
{
return get_transform().rotation;
}
inline const typename object_base::vector_type& object_base::get_scale() const
{
return get_transform().scale;
}
inline const tween<typename object_base::transform_type>& object_base::get_transform_tween() const
{
return transform;
}
inline tween<typename object_base::transform_type>& object_base::get_transform_tween()
{
return transform;
}
inline const typename object_base::bounding_volume_type* object_base::get_culling_mask() const
{
return culling_mask;
}
/**
* Abstract base class for lights, cameras, model instances, and other scene objects.
*
* @tparam T This should be the same class that's inheriting from the scene object, in order to give it a valid type-specific ID.
*/
template <class T>
class object: public object_base
{
public:
/// Unique type ID for this scene object type.
static const std::atomic<std::size_t> object_type_id;
virtual const std::size_t get_object_type_id() const final;
};
template <typename T>
const std::atomic<std::size_t> object<T>::object_type_id{object_base::next_object_type_id()};
template <typename T>
inline const std::size_t object<T>::get_object_type_id() const
{
return object_type_id;
}
} // namespace scene
#endif // ANTKEEPER_SCENE_OBJECT_HPP