rest-pose.cpp

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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/>.
 */
 
#include <engine/animation/rest-pose.hpp>
#include <engine/animation/skeleton.hpp>
#include <algorithm>
#include <execution>
 
rest_pose::rest_pose(const skeleton& skeleton):
    pose(skeleton),
    m_inverse_absolute_transforms(skeleton.get_bone_count(), bone_transform_type::identity())
{}
 
void rest_pose::update(bone_index_type first_index, std::size_t bone_count)
{
    // Update absolute transforms
    pose::update(first_index, bone_count);
    
    // Update inverse absolute transforms
    std::for_each
    (
        // std::execution::par_unseq,
        std::execution::seq,
        m_inverse_absolute_transforms.begin() + first_index,
        m_inverse_absolute_transforms.begin() + (first_index + bone_count),
        [&](auto& inverse_absolute_transform)
        {
            bone_index_type bone_index = static_cast<bone_index_type>(&inverse_absolute_transform - m_inverse_absolute_transforms.data());
            inverse_absolute_transform = math::inverse(m_absolute_transforms[bone_index]);
        }
    );
}
 
void rest_pose::resize()
{
    if (m_skeleton)
    {
        const std::size_t bone_count = m_skeleton->get_bone_count();
        
        if (bone_count != m_inverse_absolute_transforms.size())
        {
            m_relative_transforms.resize(bone_count);
            m_absolute_transforms.resize(bone_count);
            m_inverse_absolute_transforms.resize(bone_count);
        }
    }
}