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#include "stdafx.h"
#include "PerlinSimplexNoise.h"
PerlinSimplexNoise::PerlinSimplexNoise(int levels)
{
Random random;
init(&random,levels);
}
PerlinSimplexNoise::PerlinSimplexNoise(Random *random, int levels)
{
init(random,levels);
delete random;
}
void PerlinSimplexNoise::init(Random *random, int levels)
{
MemSect(3);
this->levels = levels;
noiseLevels = new SimplexNoise *[levels];
for (int i = 0; i < levels; i++)
{
noiseLevels[i] = new SimplexNoise(random);
}
MemSect(0);
}
PerlinSimplexNoise::~PerlinSimplexNoise()
{
for(int i = 0; i < levels; i++ )
{
delete noiseLevels[i];
}
delete[] noiseLevels;
}
double PerlinSimplexNoise::getValue(double x, double y)
{
double value = 0;
double pow = 1;
for (int i = 0; i < levels; i++)
{
value += noiseLevels[i]->getValue(x * pow, y * pow) / pow;
pow /= 2;
}
return value;
}
double PerlinSimplexNoise::getValue(double x, double y, double z)
{
double value = 0;
double pow = 1;
for (int i = 0; i < levels; i++)
{
value += noiseLevels[i]->getValue(x * pow, y * pow, z * pow) / pow;
pow /= 2;
}
return value;
}
doubleArray PerlinSimplexNoise::getRegion(doubleArray buffer, double x, double y, int xSize, int ySize, double xScale, double yScale, double sizeScale)
{
return getRegion(buffer, x, y, xSize, ySize, xScale, yScale, sizeScale, 0.5);
}
doubleArray PerlinSimplexNoise::getRegion(doubleArray buffer, double x, double y, int xSize, int ySize, double xScale, double yScale, double sizeScale, double powScale)
{
xScale/=1.5;
yScale/=1.5;
if (buffer.data == nullptr || static_cast<int>(buffer.length) < xSize * ySize)
{
if( buffer.data ) delete [] buffer.data;
buffer = doubleArray(xSize * ySize);
}
else for (unsigned int i = 0; i < buffer.length; i++)
buffer[i] = 0;
double pow = 1;
double scale = 1;
for (int i = 0; i < levels; i++)
{
noiseLevels[i]->add(buffer, x, y, xSize, ySize, xScale * scale, yScale * scale, 0.55/pow);
scale *= sizeScale;
pow *= powScale;
}
return buffer;
}
doubleArray PerlinSimplexNoise::getRegion(doubleArray buffer, double x, double y, double z, int xSize, int ySize, int zSize, double xScale, double yScale, double zScale)
{
xScale/=1.5;
yScale/=1.5;
if (buffer.data == nullptr) buffer = doubleArray(xSize * ySize * zSize);
else for (unsigned int i = 0; i < buffer.length; i++)
buffer[i] = 0;
double pow = 1;
for (int i = 0; i < levels; i++) {
// value += noiseLevels[i].getValue(x * pow, y * pow, z * pow) / pow;
noiseLevels[i]->add(buffer, x, y, z, xSize, ySize, zSize, xScale * pow, yScale * pow, zScale * pow, 0.55/pow);
pow *= 0.5;
}
return buffer;
}
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