skeleton.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_ANIMATION_SKELETON_HPP
#define ANTKEEPER_ANIMATION_SKELETON_HPP
 
#include <engine/animation/bone.hpp>
#include <engine/animation/rest-pose.hpp>
#include <engine/animation/animation-pose.hpp>
#include <engine/utility/hash/fnv1a.hpp>
#include <unordered_map>
#include <vector>
#include <optional>
 
class skeleton
{
public:
    explicit skeleton(std::size_t bone_count);
    
    skeleton();
    
    void update_rest_pose();
    
    bone_index_type add_bones(std::size_t bone_count);
    
    inline bone_index_type add_bone()
    {
        return add_bones(1);
    }
    
    bone_index_type add_bone(hash::fnv1a32_t name);
    
    void remove_bones();
    
    animation_pose& add_pose(hash::fnv1a32_t name);
    
    void remove_pose(hash::fnv1a32_t name);
    
    void remove_poses();
    
    void set_bone_parent(bone_index_type child_index, bone_index_type parent_index);
    
    inline void set_bone_transform(bone_index_type index, const bone_transform_type& transform)
    {
        m_rest_pose.set_relative_transform(index, transform);
    }
    
    void set_bone_name(bone_index_type index, hash::fnv1a32_t name);
    
    [[nodiscard]] inline std::size_t get_bone_count() const noexcept
    {
        return m_bone_parents.size();
    }
    
    [[nodiscard]] inline bone_index_type get_bone_parent(bone_index_type child_index) const
    {
        return m_bone_parents[child_index];
    }
    
    [[nodiscard]] std::optional<bone_index_type> get_bone_index(hash::fnv1a32_t name) const;
    
    [[nodiscard]] const animation_pose* get_pose(hash::fnv1a32_t name) const;
    [[nodiscard]] animation_pose* get_pose(hash::fnv1a32_t name);
    
    [[nodiscard]] inline const rest_pose& get_rest_pose() const noexcept
    {
        return m_rest_pose;
    }
    
private:
    std::vector<bone_index_type> m_bone_parents;
    
    rest_pose m_rest_pose;
    
    std::unordered_map<hash::fnv1a32_t, bone_index_type> m_bone_map;
    
    std::unordered_map<hash::fnv1a32_t, animation_pose> m_pose_map;
};
 
#endif // ANTKEEPER_ANIMATION_SKELETON_HPP