43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
// Copyright (C) 2016 Rémi Bèges
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// This file is part of the "Nazara Engine - Noise module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Noise/HybridMultiFractal.hpp>
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#include <Nazara/Noise/Debug.hpp>
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namespace Nz
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{
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HybridMultiFractal::HybridMultiFractal(const NoiseBase & source) :
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m_source(source)
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{
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}
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float HybridMultiFractal::Get(std::initializer_list<float> coordinates, float scale) const
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{
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float offset = 1.0f;
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float value = (m_source.Get(coordinates,scale) + offset) * m_exponent_array.at(0);
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float weight = value;
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float signal = 0.f;
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scale *= m_lacunarity;
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for(int i(1) ; i < m_octaves; ++i)
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{
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if (weight > 1.f)
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weight = 1.f;
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signal = (m_source.Get(coordinates,scale) + offset) * m_exponent_array.at(i);
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value += weight * signal;
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weight *= signal;
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scale *= m_lacunarity;
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}
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float remainder = m_octaves - static_cast<int>(m_octaves);
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if (remainder > 0.f)
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value += remainder * m_source.Get(coordinates,scale) * m_exponent_array.at(static_cast<int>(m_octaves-1));
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return value / m_sum - offset;
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}
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}
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