perlin.h

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// MIT License
//
// Copyright (c) 2022 Ian Parberry
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
 
#ifndef __PERLIN_H__
#define __PERLIN_H__
 
#include <windows.h>
#include <windowsx.h>
#include <random>
 
#include "Defines.h"
 
 
class CPerlinNoise2D{
  private:
    eHash m_eHash = eHash::Permutation; 
    eSpline m_eSpline = eSpline::Cubic; 
    eDistribution m_eDistribution = eDistribution::Uniform; 
 
    size_t* m_nPerm = nullptr; 
    float* m_fTable = nullptr; 
    
    std::default_random_engine m_stdRandom; 
    UINT m_nSeed = 0; 
 
    const size_t m_nDefTableSize = 256; 
    const size_t m_nMinTableSize = 16; 
    const size_t m_nMaxTableSize = 1024; 
 
    size_t m_nSize = m_nDefTableSize; 
    size_t m_nMask = m_nDefTableSize - 1; 
    
    inline const size_t pair(size_t, size_t) const; 
    inline const size_t pairstd(size_t, size_t) const; 
    
    inline const size_t hash(size_t) const; 
    inline const size_t hashstd(size_t) const; 
    inline const size_t hash2(size_t, size_t) const; 
 
    void HashCorners(size_t, size_t, size_t[4]) const; 
    
    void RandomizeTableUniform(); 
    void RandomizeTableCos(); 
    void RandomizeTableNormal(); 
    void RandomizeTableExp(); 
    void RandomizeTableMaximal(); 
 
    void RandomizeTableMidpoint(size_t, size_t, float); 
    void RandomizeTableMidpoint(); 
 
    inline const float spline(float) const; 
    inline const float z(size_t, float, float, eNoise) const; 
    const float Lerp(float, float, float, size_t*, eNoise) const; 
    const float noise(float, float, eNoise) const; 
 
    void RandomizePermutation(); 
    void Initialize(); 
 
  public:
    CPerlinNoise2D(); 
    ~CPerlinNoise2D(); 
    
    const float generate(float, float, eNoise, size_t, float=0.5f, float=2.0f)
      const; 
 
    //functions that change the noise properties
    
    void SetSeed(); 
    void RandomizeTable(eDistribution); 
 
    bool DoubleTableSize(); 
    bool HalveTableSize(); 
    bool DefaultTableSize(); 
    
    void SetSpline(eSpline); 
    void SetHash(eHash); 
 
    //reader functions
    
    const size_t GetTableSize() const; 
    const size_t GetMinTableSize() const; 
    const size_t GetMaxTableSize() const; 
    const size_t GetDefTableSize() const; 
 
    const eHash GetHash() const; 
    const eSpline GetSpline() const; 
    const eDistribution GetDistribution() const; 
}; //CPerlinNoise2D
 
#endif //__PERLIN_H__