float_encoder.hpp

#pragma once
 
#include <cmath>
#include <cstdint>
#include <stdexcept>
 
namespace LibXR
{
 
template <int Bits, typename Scalar = float>
class FloatEncoder
{
 public:
  static_assert(Bits > 0 && Bits < 32, "Bits must be between 1 and 31");
 
  static constexpr uint32_t MaxInt() { return (1u << Bits) - 1; }
 
  FloatEncoder(Scalar min, Scalar max) : min_(min), max_(max), range_(max - min) {}
 
  uint32_t Encode(Scalar value) const
  {
    Scalar clamped = std::fmin(std::fmax(value, min_), max_);
    Scalar norm = (clamped - min_) / range_;
    return static_cast<uint32_t>(std::round(norm * MaxInt()));
  }
 
  Scalar Decode(uint32_t encoded) const
  {
    Scalar norm = static_cast<Scalar>(encoded) / MaxInt();
    return min_ + norm * range_;
  }
 
 private:
  Scalar min_;    
  Scalar max_;    
  Scalar range_;  
};
 
}  // namespace LibXR