Random.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2018 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
#ifndef GF_RANDOM_H
#define GF_RANDOM_H

#include <cstdint>
#include <random>

#include "Portability.h"
#include "Rect.h"
#include "Vector.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif

  class GF_API Random {
  public:
    Random();

    Random(std::uint_fast32_t seed)
    : m_engine(seed)
    {

    }

    template<typename T>
    T computeUniformInteger(T min, T max) {
      std::uniform_int_distribution<T> dist(min, max);
      return dist(m_engine);
    }

    template<typename T>
    T computeUniformFloat(T min, T max) {
      std::uniform_real_distribution<T> dist(min, max);
      return dist(m_engine);
    }

    template<typename T>
    T computeNormalFloat(T mean, T stddev) {
      std::normal_distribution<T> dist(mean, stddev);
      return dist(m_engine);
    }

    bool computeBernoulli(double p) {
      std::bernoulli_distribution dist(p);
      return dist(m_engine);
    }

    Vector2f computePosition(const RectF& area);

    Vector2i computePosition(const RectI& area);

    std::mt19937& getEngine() {
      return m_engine;
    }

  private:
    std::mt19937 m_engine;
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_RANDOM_H