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