HudTween.hpp

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#pragma once
 
#include <cstdint>

using HudEaseFn = float (*)(float t);
 
// ── Built-in easing functions ───────────────────────────────────────────────
float easeLinear(float t);
float easeInQuad(float t);
float easeOutQuad(float t);
float easeInOutQuad(float t);
float easeOutBack(float t);
float easeOutElastic(float t);
 
// ── Tween pool ──────────────────────────────────────────────────────────────

struct HudTweenEntry
{
    float* target = nullptr;
    float from = 0.f;
    float to = 0.f;
    float duration = 0.f;
    float elapsed = 0.f;
    HudEaseFn ease = easeOutQuad;
    bool active = false;
};

class HudTweenPool
{
public:
    static constexpr int k_maxTweens = 64;

    void tween(float* target, float to, float duration, HudEaseFn ease = easeOutQuad);

    void tween(float* target, float from, float to, float duration, HudEaseFn ease = easeOutQuad);

    void cancel(float* target);

    void update(float dt);
 
private:
    HudTweenEntry entries_[k_maxTweens] = {};

    HudTweenEntry* findSlot(float* target);
};