animation-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/animation-pose.hpp>
#include <engine/animation/skeleton.hpp>
#include <algorithm>
#include <execution>
 
animation_pose::animation_pose(const skeleton& skeleton):
    pose(skeleton),
    m_matrix_palette(skeleton.get_bone_count())
{
    reset();
}
 
void animation_pose::update(bone_index_type first_index, std::size_t bone_count)
{
    // Update absolute transforms
    pose::update(first_index, bone_count);
    
    // Get skeleton rest pose
    const auto& rest_pose = m_skeleton->get_rest_pose();
    
    // Update skinning matrix palette
    std::for_each
    (
        // std::execution::par_unseq,
        std::execution::seq,
        m_matrix_palette.begin() + first_index,
        m_matrix_palette.begin() + (first_index + bone_count),
        [&](auto& skinning_matrix)
        {
            const bone_index_type bone_index = static_cast<bone_index_type>(&skinning_matrix - m_matrix_palette.data());
            skinning_matrix = (m_absolute_transforms[bone_index] * rest_pose.get_inverse_absolute_transform(bone_index)).matrix();
        }
    );
}
 
void animation_pose::reset()
{
    if (!m_skeleton)
    {
        return;
    }
    
    // Get skeleton rest pose
    const auto& rest_pose = m_skeleton->get_rest_pose();
    
    // Reset transforms and skinning matrix palette
    std::for_each
    (
        // std::execution::par_unseq,
        std::execution::seq,
        m_relative_transforms.begin(),
        m_relative_transforms.end(),
        [&](auto& relative_transform)
        {
            const bone_index_type bone_index = static_cast<bone_index_type>(&relative_transform - m_relative_transforms.data());
            
            relative_transform = rest_pose.get_relative_transform(bone_index);
            m_absolute_transforms[bone_index] = rest_pose.get_absolute_transform(bone_index);
            m_matrix_palette[bone_index] = bone_matrix_type::identity();
        }
    );
}