Function time_alphaf

src/fl/math/time_alpha.h:25–33

u16 time_alpha16(u32 now, u32 start, u32 end) FL_NOEXCEPT;

inline float time_alphaf(u32 now, u32 start, u32 end) FL_NOEXCEPT {
    if (now < start) {
        return 0.0f;
    }
    u32 elapsed = now - start;
    u32 total = end - start;
    float out = static_cast<float>(elapsed) / static_cast<float>(total);
    return out;
}

class TimeAlpha {
  public: