// Copyright (C) 2015 Rémi Bèges
// This file is part of the "Nazara Engine".
// For conditions of distribution and use, see copyright notice in Config.hpp

#include <cmath>
#include <Nazara/Core/Error.hpp>
#include <Nazara/Noise/Config.hpp>
#include <Nazara/Noise/ComplexNoiseBase.hpp>
#include <Nazara/Noise/Debug.hpp>

namespace Nz
{
	ComplexNoiseBase::ComplexNoiseBase()
	{
		m_parametersModified = true;
		m_lacunarity = 5.0f;
		m_hurst = 1.2f;
		m_octaves = 3.0f;

		for (int i(0) ; i < m_octaves; ++i)
		{
			m_exponent_array[i] = 0;
		}
	}

	float ComplexNoiseBase::GetLacunarity() const
	{

		return m_lacunarity;
	}

	float ComplexNoiseBase::GetHurstParameter() const
	{
		return m_hurst;
	}

	float ComplexNoiseBase::GetOctaveNumber() const
	{
		return m_octaves;
	}

	void ComplexNoiseBase::SetLacunarity(float lacunarity)
	{
		m_lacunarity = lacunarity;
		m_parametersModified = true;

	}

	void ComplexNoiseBase::SetHurstParameter(float h)
	{
		m_hurst = h;
		m_parametersModified = true;
	}

	void ComplexNoiseBase::SetOctavesNumber(float octaves)
	{
		if(octaves <= 30.0f)
			m_octaves = octaves;
		else
			m_octaves = 30.0f;

		m_parametersModified = true;
	}

	void ComplexNoiseBase::RecomputeExponentArray()
	{
		if(m_parametersModified)
		{
			float frequency = 1.0;
			m_sum = 0.f;
			for (int i(0) ; i < static_cast<int>(m_octaves) ; ++i)
			{

				m_exponent_array[i] = std::pow( frequency, -m_hurst );
				frequency *= m_lacunarity;

				m_sum += m_exponent_array[i];

			}
			m_parametersModified = false;
		}
	}
}