💿🐜 Antkeeper source code
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185 lines
4.4 KiB
185 lines
4.4 KiB
/*
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* Copyright (C) 2023 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_SCENE_OBJECT_HPP
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#define ANTKEEPER_SCENE_OBJECT_HPP
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#include <engine/geom/primitives/box.hpp>
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#include <engine/math/vector.hpp>
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#include <engine/math/quaternion.hpp>
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#include <engine/math/transform-type.hpp>
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#include <engine/render/context.hpp>
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#include <atomic>
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#include <cstddef>
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namespace scene {
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/**
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* Abstract base class for scene objects.
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*/
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class object_base
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{
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public:
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using vector_type = math::vector<float, 3>;
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using quaternion_type = math::quaternion<float>;
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using transform_type = math::transform<float>;
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using aabb_type = geom::box<float>;
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/// Returns the type ID for this scene object type.
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virtual const std::size_t get_object_type_id() const noexcept = 0;
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/**
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* Adds render operations to a render context.
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*
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* @param ctx Render context.
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*/
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inline virtual void render(render::context& ctx) const {}
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/**
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* Activates or deactivates the scene object.
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*/
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inline void set_active(bool active) noexcept
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{
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m_active = active;
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}
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/**
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*
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*/
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void look_at(const vector_type& position, const vector_type& target, const vector_type& up);
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/**
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* Sets the scene object's transform.
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*/
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inline void set_transform(const transform_type& transform)
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{
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m_transform = transform;
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transformed();
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}
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/**
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* Sets the scene object's translation.
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*/
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inline void set_translation(const vector_type& translation)
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{
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m_transform.translation = translation;
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transformed();
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}
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/**
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* Sets the scene object's rotation.
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*/
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inline void set_rotation(const quaternion_type& rotation)
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{
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m_transform.rotation = rotation;
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transformed();
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}
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/**
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* Sets the scene object's scale.
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*/
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inline void set_scale(const vector_type& scale)
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{
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m_transform.scale = scale;
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transformed();
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}
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/// Returns whether the scene object is active.
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[[nodiscard]] inline bool is_active() const noexcept
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{
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return m_active;
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}
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/**
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* Returns the transform.
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*/
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[[nodiscard]] inline const transform_type& get_transform() const noexcept
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{
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return m_transform;
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}
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/**
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* Returns the transform's translation vector.
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*/
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[[nodiscard]] inline const vector_type& get_translation() const noexcept
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{
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return m_transform.translation;
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}
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/**
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* Returns the transform's rotation quaternion.
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*/
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[[nodiscard]] inline const quaternion_type& get_rotation() const noexcept
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{
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return m_transform.rotation;
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}
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/**
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* Returns the transform's scale vector.
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*/
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[[nodiscard]] inline const vector_type& get_scale() const noexcept
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{
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return m_transform.scale;
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}
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/**
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* Returns the bounds of the object.
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*/
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[[nodiscard]] virtual const aabb_type& get_bounds() const noexcept = 0;
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protected:
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static std::size_t next_object_type_id();
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private:
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/// Interpolates between two transforms.
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static transform_type interpolate_transforms(const transform_type& x, const transform_type& y, float a);
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/**
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* Called every time the scene object's tranform is changed.
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*/
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inline virtual void transformed() {}
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bool m_active{true};
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transform_type m_transform{transform_type::identity};
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};
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/**
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* Abstract base class for lights, cameras, model instances, and other scene objects.
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*
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* @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.
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*/
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template <class T>
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class object: public object_base
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{
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public:
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/// Unique type ID for this scene object type.
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static const std::atomic<std::size_t> object_type_id;
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inline const std::size_t get_object_type_id() const noexcept final
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{
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return object_type_id;
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}
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};
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template <typename T>
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const std::atomic<std::size_t> object<T>::object_type_id{object_base::next_object_type_id()};
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} // namespace scene
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#endif // ANTKEEPER_SCENE_OBJECT_HPP
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