SkeletalAnimatable.cpp

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/*
   Copyright 2022 Rishi Challa
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
 
       http://www.apache.org/licenses/LICENSE-2.0
 
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
 
#include "SkeletalAnimatable.hpp"
 
using namespace Kale;
 
Skeleton::Skeleton() {
    // Empty Body
}
 
Skeleton::Skeleton(const std::vector<std::tuple<int, float, float>>& bones, AngleUnit unit) {
    this->bones.reserve(bones.size());
    for (const std::tuple<int, float, float>& bone : bones)
        this->bones.push_back(Skeleton::calculateBone(this->bones, std::get<0>(bone), std::get<1>(bone), std::get<2>(bone), unit));
}
 
Skeleton::Skeleton(const std::vector<Bone>& bones) : bones(bones) {
    // Empty Body
}
 
SkeletalAnimatable::SkeletalAnimatable() {
    // Empty Body
}
 
SkeletalAnimatable::SkeletalAnimatable(const Skeleton& base) : base(base) {
    // Empty Body
}
 
void SkeletalAnimatable::setBase(const Skeleton& skeleton) {
    base = skeleton;
}
 
void SkeletalAnimatable::recalculateSkeleton(float deltaTime) {
    // Everything below is thread sensitive and modifies data accessed from other threads. We need mutual access to it
    std::lock_guard lock(mutex);
 
    // If the skeleton has already been recalculated, we don't need to recalculate.
    if (skeletonRecalculated) return;
 
    // Update the states and retrieve the composition. Also flag the skeleton as recalculated
    updateState(deltaTime);
    skeletonRecalculated = true;
    std::vector<std::pair<int, float>> composition = getStateComposition<int>();
 
    // Resize the skeleton if it isn't already at the correct size
    if (skeleton.size() != structures[composition[0].first].bones.size())
        skeleton.resize(structures[composition[0].first].bones.size());
 
    // If the composition size is 1, then the skeleton is simply a single state.
    if (composition.size() == 1) {
        // Simply take the state's worldToBones and multiply it by the inverse of our base
        const std::vector<Skeleton::Bone>& skeletonState = structures[composition[0].first].bones;
        for (size_t i = 0; i < skeleton.size(); i++) skeleton[i] = base.bones[i].inverseWorldToBone * skeletonState[i].worldToBone;
        return;
    }
 
    // If the composition size is 2, then the skeleton is a lerp between two states
    const std::vector<Skeleton::Bone>& fromSkeletonState = structures[composition[0].first].bones;
    const std::vector<Skeleton::Bone>& toSkeletonState = structures[composition[1].first].bones;
    for (size_t i = 0; i < skeleton.size(); i++) {
        // Lerp the transformation matrices between the two states then multiply it with our inverse to get the offset matrix
        skeleton[i] = fromSkeletonState[i].worldToBone * composition[0].second + toSkeletonState[i].worldToBone * composition[1].second;
        skeleton[i] = base.bones[i].inverseWorldToBone * skeleton[i];
    }
}
 
void SkeletalAnimatable::update(size_t threadNum, const Scene& scene, float deltaTime) {
    skeletonRecalculated = false;
}
 
void SkeletalAnimatable::preUpdate(size_t threadNum, const Scene& scene, float deltaTime) {
    recalculateSkeleton(deltaTime);
}
 
const std::vector<Transform>& SkeletalAnimatable::getSkeleton(float deltaTime) {
    recalculateSkeleton(deltaTime);
    return skeleton;
}
 
const std::vector<Transform>& SkeletalAnimatable::getSkeletonNoRecalc() const {
    return skeleton;
}
 
Vector2f SkeletalAnimatable::transform(Vector2f vert, const std::array<std::pair<int, float>, 4>& weights, float deltaTime) {
    recalculateSkeleton(deltaTime);
    return Skeleton::transform(skeleton, vert, weights);
}
 
Vector2f SkeletalAnimatable::transformNoRecalc(Vector2f vert, const std::array<std::pair<int, float>, 4>& weights) const {
    return Skeleton::transform(skeleton, vert, weights);
}