63 lines
1.7 KiB
C++
63 lines
1.7 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/FBM.hpp>
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#include <Nazara/Noise/Debug.hpp>
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namespace Nz
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{
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FBM::FBM(const NoiseBase & source): m_source(source)
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{
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}
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///TODO: Handle with variadic templates
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float FBM::Get(float x, float y, float scale) const
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{
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float value = 0.f;
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for(int i = 0; i < m_octaves; ++i)
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{
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value += m_source.Get(x, y, scale) * m_exponent_array.at(i);
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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(std::fabs(remainder) > 0.01f)
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value += remainder * m_source.Get(x, y, scale) * m_exponent_array.at(static_cast<int>(m_octaves-1));
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return value / m_sum;
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}
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float FBM::Get(float x, float y, float z, float scale) const
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{
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float value = 0.f;
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for(int i = 0; i < m_octaves; ++i)
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{
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value += m_source.Get(x, y, z, scale) * m_exponent_array.at(i);
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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(std::fabs(remainder) > 0.01f)
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value += remainder * m_source.Get(x, y, z, scale) * m_exponent_array.at(static_cast<int>(m_octaves-1));
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return value / m_sum;
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}
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float FBM::Get(float x, float y, float z, float w, float scale) const
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{
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float value = 0.f;
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for(int i = 0; i < m_octaves; ++i)
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{
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value += m_source.Get(x, y, z, w, scale) * m_exponent_array.at(i);
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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(std::fabs(remainder) > 0.01f)
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value += remainder * m_source.Get(x, y, z, w, scale) * m_exponent_array.at(static_cast<int>(m_octaves-1));
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return value / m_sum;
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}
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}
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