86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
#include "anime_loader.hpp"
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using ::basalt::shared::math::FloatPoint;
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namespace basalt::shared::anime_loader {
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#pragma region Timeline
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Timeline::Timeline() : keyframes(), max_frame_cache(0) {
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// insert default frame for first index
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this->keyframes[0] = KeyFrame{.position = {0, 0, 0}, .rotation = {0, 0, 0, 1}};
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}
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Timeline::~Timeline() {}
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void Timeline::add_key_frame(math::Index frame_index, KeyFrame frame_data) {
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// insert data
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this->keyframes[frame_index] = frame_data;
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// update max frame
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this->max_frame_cache = keyframes.rbegin()->first;
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}
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math::Index Timeline::max_frame() const {
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return this->max_frame_cache;
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}
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KeyFrameSpan Timeline::tick(math::Index frame_index) const {
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if (this->keyframes.empty()) [[unlikely]] {
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throw std::runtime_error("No key frames in timeline");
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}
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// 首先用lower_bound获取到不小于自身的项目（肯定能获取到）
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auto lower_bound = this->keyframes.lower_bound(frame_index);
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// 获取下一帧，如果没有下一帧，就转换为自身
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auto upper_bound = lower_bound;
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++upper_bound;
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if (upper_bound == this->keyframes.end()) {
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upper_bound = lower_bound;
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}
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// 计算归一化时间
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FloatPoint next_time = static_cast<FloatPoint>(frame_index - lower_bound->first)
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/ static_cast<FloatPoint>(upper_bound->first - lower_bound->first + 1);
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FloatPoint prev_time = static_cast<FloatPoint>(1) - next_time;
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// 返回结构
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return KeyFrameSpan{
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.prev_time = prev_time,
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.next_time = next_time,
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.prev_position = lower_bound->second.position,
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.next_position = upper_bound->second.position,
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.prev_rotation = lower_bound->second.rotation,
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.next_rotation = upper_bound->second.rotation,
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};
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}
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#pragma endregion
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#pragma region Anime Loader
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IAnimeLoader::IAnimeLoader() : status(AnimeLoaderStatus::Ready), time(0), timeline() {}
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IAnimeLoader::~IAnimeLoader() {}
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void IAnimeLoader::load(AnimeLoaderConfig&& config) {
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if (this->status != AnimeLoaderStatus::Ready) throw std::runtime_error("unexpected anime loader status");
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this->config = std::move(config);
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this->status = AnimeLoaderStatus::Loaded;
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}
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KeyFrameSpan IAnimeLoader::tick() {
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if (this->status != AnimeLoaderStatus::Loaded) throw std::runtime_error("unexpected anime loader status");
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// Accumulate time
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++this->time;
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if (this->time > this->timeline.max_frame()) {
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this->time = 0;
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}
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// Return from timeline
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return this->timeline.tick(this->time);
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}
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#pragma endregion
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} // namespace basalt::shared::anime_loader
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