FactoryCraft-Server/FactoryCraft/RandNoise.cpp

#include "RandNoise.h"

#include <stdlib.h>

#ifndef RAND_MAX
#    define RAND_MAX 0x7FFF
#endif

RandNoise::RandNoise(int seed)
    : Noise(),
      seed(seed)
{
    srand(seed);
    table = new unsigned short[RandNoiseTableSize];
    for (int i = 0; i < RandNoiseTableSize; i++)
    {
        int r = rand();
        table[i] = (unsigned short)(r % RAND_MAX);
    }
}

RandNoise::~RandNoise()
{
    delete[] table;
}

int RandNoise::getSeed() const
{
    return seed;
}

double RandNoise::getNoise(double x, double y, double z)
{
    int index = seed % RandNoiseTableSize;
    index = abs(table[index] + (int)x) % RandNoiseTableSize;
    index = abs(table[index] + (int)y) % RandNoiseTableSize;
    index = abs(table[index] + (int)z) % RandNoiseTableSize;
    return (double)table[index] / RAND_MAX;
}