rewind.h

#pragma once
 
#include <cstdint>
#include <unordered_map>
 
#include <glm/glm.hpp>
#include <glm/gtc/quaternion.hpp>
 
#include "ecs/entity.h"
#include "net/prediction/sample_track.h"
 
namespace Vkm::Engine {

class NetRewind {
    public:
        static constexpr size_t HISTORY_TICKS = 64;
 
    public:
        NetRewind() = default;
        ~NetRewind() = default;
 
        NetRewind(const NetRewind& other) = delete;
        NetRewind& operator=(const NetRewind& other) = delete;
 
        NetRewind(NetRewind && other) = delete;
        NetRewind& operator=(NetRewind && other) = delete;
 
    public:
        void record(EntityId entity, uint32_t tick, const glm::vec3& position, const glm::quat& rotation);

        bool poseAt(EntityId entity, double tick, glm::vec3& position, glm::quat& rotation) const;

        void forget(EntityId entity);
 
        void clear() { m_tracks.clear(); }
 
        size_t tracked() const { return m_tracks.size(); }
 
    private:
        std::unordered_map<uint32_t, SampleTrack<HISTORY_TICKS>> m_tracks;
};
 
} // namespace Vkm::Engine