💿🐜 Antkeeper source code
https://antkeeper.com
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119 lines
2.9 KiB
119 lines
2.9 KiB
/*
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* Copyright (C) 2021 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_ANIMATION_BONE_HPP
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#define ANTKEEPER_ANIMATION_BONE_HPP
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#include <cstdint>
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/// Mask to extract the index of a bone.
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constexpr std::uint16_t bone_index_mask = 0xFF;
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/**
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* Skeletal animation bone identifier, consisting of a bone index in the lower half, and a parent bone index in the upper half.
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*/
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typedef std::uint16_t bone;
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/**
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* Bone index comparison function object.
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*/
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struct bone_index_compare
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{
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/**
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* Compares the indices of two bones.
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*
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* @param lhs First bone.
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* @param rhs Second bone.
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* @return Comparison result.
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*/
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bool operator()(const bone& lhs, const bone& rhs) const;
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};
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/**
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* Constructs a bone identifier.
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*
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* @param index Index of the bone.
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* @param parent_index Index of the parent bone.
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* @return Bone identifier.
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*/
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bone make_bone(std::uint8_t index, std::uint8_t parent_index);
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/**
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* Constructs an orphan bone identifier.
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*
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* @param index Index of the orphan bone.
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* @return Orphan bone identifier.
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*/
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bone make_bone(std::uint8_t index);
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/**
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* Returns the index of a bone.
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*
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* @param x Bone identifier.
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* @return Index of the bone.
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*/
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std::uint8_t bone_index(bone x);
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/**
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* Returns the parent index of a bone.
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*
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* @param x Bone identifier.
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* @return Index of the parent bone.
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*/
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std::uint8_t bone_parent_index(bone x);
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/**
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* Returns `true` if a bone has a parent, `false` otherwise.
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*
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* @param x Bone identifier.
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* @return Bone parent status.
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*/
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bool bone_has_parent(bone x);
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inline bool bone_index_compare::operator()(const bone& lhs, const bone& rhs) const
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{
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return (lhs & bone_index_mask) < (rhs & bone_index_mask);
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}
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inline bone make_bone(std::uint8_t index, std::uint8_t parent_index)
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{
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return (static_cast<std::uint16_t>(parent_index) << 8) | index;
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}
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inline bone make_bone(std::uint8_t index)
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{
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return make_bone(index, index);
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}
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inline std::uint8_t bone_index(bone x)
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{
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return static_cast<std::uint8_t>(x & bone_index_mask);
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}
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inline std::uint8_t bone_parent_index(bone x)
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{
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return static_cast<std::uint8_t>(x >> 8);
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}
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inline bool bone_has_parent(bone x)
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{
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return (x & bone_index_mask) != (x >> 8);
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}
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#endif // ANTKEEPER_ANIMATION_BONE_HPP
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