66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
// Copyright (C) 2012 Rémi Bèges
|
|
// This file is part of the "Nazara Engine".
|
|
// For conditions of distribution and use, see copyright notice in Config.hpp
|
|
|
|
#include <Nazara/Core/Error.hpp>
|
|
#include <Nazara/Noise/Config.hpp>
|
|
#include <Nazara/Noise/HybridMultiFractal4D.hpp>
|
|
#include <Nazara/Noise/Perlin4D.hpp>
|
|
#include <Nazara/Noise/Simplex4D.hpp>
|
|
#include <Nazara/Noise/Debug.hpp>
|
|
|
|
NzHybridMultiFractal4D::NzHybridMultiFractal4D(nzNoises source, unsigned int seed)
|
|
{
|
|
switch(source)
|
|
{
|
|
case PERLIN:
|
|
m_source = new NzPerlin4D();
|
|
break;
|
|
|
|
default:
|
|
m_source = new NzSimplex4D();
|
|
break;
|
|
}
|
|
m_source->SetNewSeed(seed);
|
|
m_source->ShufflePermutationTable();
|
|
m_noiseType = source;
|
|
}
|
|
|
|
float NzHybridMultiFractal4D::GetValue(float x, float y, float z, float w, float resolution)
|
|
{
|
|
this->RecomputeExponentArray();
|
|
|
|
m_offset = 1.0f;
|
|
|
|
m_value = (m_source->GetValue(x,y,z,w,resolution) + m_offset) * m_exponent_array[0];
|
|
m_weight = m_value;
|
|
m_signal = 0.f;
|
|
|
|
resolution *= m_lacunarity;
|
|
|
|
for(int i(1) ; i < m_octaves; ++i)
|
|
{
|
|
if(m_weight > 1.0)
|
|
m_weight = 1.0;
|
|
|
|
m_signal = (m_source->GetValue(x,y,z,w,resolution) + m_offset) * m_exponent_array[i];
|
|
m_value += m_weight * m_signal;
|
|
|
|
m_weight *= m_signal;
|
|
|
|
resolution *= m_lacunarity;
|
|
}
|
|
|
|
m_remainder = m_octaves - static_cast<int>(m_octaves);
|
|
|
|
if (m_remainder != 0)
|
|
m_value += m_remainder * m_source->GetValue(x,y,z,w,resolution) * m_exponent_array[static_cast<int>(m_octaves-1)];
|
|
|
|
return m_value/this->m_sum - m_offset;
|
|
}
|
|
|
|
NzHybridMultiFractal4D::~NzHybridMultiFractal4D()
|
|
{
|
|
delete m_source;
|
|
}
|