Random.hpp

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#pragma once
 
#include <glm/glm.hpp>
#include <limits>
#include <random>
#include <vector>
 
namespace shkyera::random {
 
template <typename SampledType>
class Uniform {
 public:
  Uniform(SampledType min, SampledType max) : _dist(min, max), _rng(std::random_device{}()) {}
 
  SampledType operator()() { return _dist(_rng); }
 
 private:
  std::mt19937_64 _rng;
  std::uniform_real_distribution<SampledType> _dist;
};
 
template <typename SampledType>
class Normal {
 public:
  Normal(SampledType mean, SampledType stddev) : _dist(mean, stddev), _rng(std::random_device{}()) {}
 
  double operator()() { return _dist(_rng); }
 
 private:
  std::mt19937_64 _rng;
  std::normal_distribution<SampledType> _dist;
};
 
class Sphere {
 public:
  Sphere() : _uniformSampler(-1.0f, 1.0f), _rng(std::random_device{}()) {}
 
  glm::vec3 operator()() {
    glm::vec3 point;
 
    point.x = _uniformSampler();
    point.y = _uniformSampler();
    point.z = _uniformSampler();
 
    return glm::normalize(point);
  }
 
 private:
  Uniform<float> _uniformSampler;
  std::mt19937_64 _rng;
};
 
}  // namespace shkyera::random