TracerEffect.hpp

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#pragma once
 
#include "ecs/registry/Registry.hpp"
#include "particles/ParticlePool.hpp"
#include "particles/ParticleTypes.hpp"
 
#include <glm/glm.hpp>
#include <unordered_map>
 
class TracerEffect
{
public:
    void update(float dt, Registry& registry);
 
    void attach(entt::entity e, Registry& registry);
 
    void detach(entt::entity e);
 
    void spawnFree(glm::vec3 tip, glm::vec3 tail, float lifetime = 0.12f);
 
    [[nodiscard]] const TracerParticle* data() const { return pool_.rawData(); }
    [[nodiscard]] uint32_t count() const { return pool_.liveCount(); }
 
private:
    ParticlePool<TracerParticle, 512> pool_;
 
    // Maps entity -> index into pool (for fast detach / per-entity update)
    std::unordered_map<uint32_t, uint32_t> entityToIdx_;
 
    static constexpr float k_streakLength = 200.f; 
    static constexpr float k_fadeTime = 0.15f;     
};