5970682035
Former-commit-id: 77de49ee01fea466cb97b22771e4c625389fd95c [formerly edce9427bc009c8ea6a6df35d9ce134a83ab985c] Former-commit-id: 76227519c8be75a45f6f65250a0870c2eb866953
99 lines
2.5 KiB
C++
99 lines
2.5 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(float x, float y, float scale) const
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{
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float offset = 1.0f;
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float value = (m_source.Get(x, y, 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(x, y, 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(x, y, 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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float HybridMultiFractal::Get(float x, float y, float z, float scale) const
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{
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float offset = 1.0f;
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float value = (m_source.Get(x, y, z, 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(x, y, z, 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(x, y, z, 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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float HybridMultiFractal::Get(float x, float y, float z, float w, float scale) const
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{
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float offset = 1.0f;
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float value = (m_source.Get(x, y, z, w, 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(x, y, z, w, 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(x, y, z, w, 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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