InterpolationBuffer.hpp

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#pragma once
 
#include "AnimSnapshot.hpp"
 
#include <SDL3/SDL_stdinc.h>
 
#include <array>
#include <cstddef>
#include <glm/vec3.hpp>

struct InterpolationBuffer
{
    static constexpr std::size_t k_capacity = 8;

    struct Sample
    {
        Uint64 captureNs = 0;     
        glm::vec3 position{0.0f}; 
        glm::vec3 velocity{0.0f}; 
        float yaw = 0.0f;         
        float pitch = 0.0f;       
 
        // PlayerVisState fields the animator reads, interp-delayed
        // alongside the position so locomotion-state transitions
        // happen at the SAME logical instant the body visibly
        // changes pose.  Stored as `uint8_t` casts to keep this
        // header free of `PlayerStateEnums.hpp` dependency.
        std::uint8_t moveMode = 0;    
        std::uint8_t wallRunSide = 0; 
        bool grounded = false;        
        bool sprinting = false;       
        bool crouching = false;       

        AnimSnapshot anim{};
    };
 
    std::array<Sample, k_capacity> ring{};
    std::size_t head = 0;  
    std::size_t count = 0; 
};