65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
// Copyright (C) 2013 Rémi Bèges
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// This file is part of the "Nazara Engine".
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Core/Error.hpp>
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#include <Nazara/Noise/Config.hpp>
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#include <Nazara/Noise/HybridMultiFractal2D.hpp>
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#include <Nazara/Noise/Perlin2D.hpp>
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#include <Nazara/Noise/Simplex2D.hpp>
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#include <Nazara/Noise/Debug.hpp>
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NzHybridMultiFractal2D::NzHybridMultiFractal2D(nzNoises source, unsigned int seed)
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{
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switch(source)
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{
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case PERLIN:
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m_source = new NzPerlin2D();
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break;
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default:
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m_source = new NzSimplex2D();
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break;
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}
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m_source->SetNewSeed(seed);
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m_source->ShufflePermutationTable();
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m_noiseType = source;
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}
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float NzHybridMultiFractal2D::GetValue(float x, float y, float resolution)
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{
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this->RecomputeExponentArray();
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m_offset = 1.0f;
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m_value = (m_source->GetValue(x,y,resolution) + m_offset) * m_exponent_array[0];
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m_weight = m_value;
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m_signal = 0.f;
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resolution *= m_lacunarity;
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for(int i(1) ; i < m_octaves; ++i)
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{
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if (m_weight > 1.f)
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m_weight = 1.f;
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m_signal = (m_source->GetValue(x,y,resolution) + m_offset) * m_exponent_array[i];
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m_value += m_weight * m_signal;
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m_weight *= m_signal;
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resolution *= m_lacunarity;
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}
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m_remainder = std::floor(m_octaves);
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if (m_remainder > 0.f)
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m_value += m_remainder * m_source->GetValue(x,y,resolution) * m_exponent_array[static_cast<int>(m_octaves-1)];
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return m_value/this->m_sum - m_offset;
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}
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NzHybridMultiFractal2D::~NzHybridMultiFractal2D()
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{
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delete m_source;
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}
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