FFT.h

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/*
--------------------------------------------------------------------------------
This source file is part of Hydrax.
Visit ---
 
Copyright (C) 2008 Xavier Verguín González <xavierverguin@hotmail.com>
                                           <xavyiy@gmail.com>
 
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
 
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
--------------------------------------------------------------------------------
*/
 
#ifndef _Hydrax_Noise_FFT_H_
#define _Hydrax_Noise_FFT_H_
 
 
 
#include "Noise.h"
 
#include <complex>
 
 
 
namespace Hydrax{ namespace Noise
{
    class FFT : public Noise
    {
    public:
        struct Options
        {
            int Resolution;
            float PhysicalResolution;
            float Scale;
            Ogre::Vector2 WindDirection;
            float AnimationSpeed;
            float KwPower;
            float Amplitude;
 
            float GPU_Strength;
            Ogre::Vector3 GPU_LODParameters;
 
            Options()
                : Resolution(128)
                , PhysicalResolution(32.0f)
                , Scale(0.25f)
                , WindDirection(Ogre::Vector2(4,5))
                , AnimationSpeed(1)
                , KwPower(6.0f)
                , Amplitude(1.0f)
                , GPU_Strength(2.0f)
                , GPU_LODParameters(Ogre::Vector3(0.5f, 50, 150000))
            {
            }
 
            Options(const int&           _Resolution,
                    const float&         _PhysicalResolution,
                    const float&         _Scale,
                    const Ogre::Vector2& _WindDirection,
                    const float&         _AnimationSpeed,
                    const float&         _KwPower,
                    const float&         _Amplitude)
                : Resolution(_Resolution)
                , PhysicalResolution(_PhysicalResolution)
                , Scale(_Scale)
                , WindDirection(_WindDirection)
                , AnimationSpeed(_AnimationSpeed)
                , KwPower(_KwPower)
                , Amplitude(_Amplitude)
                , GPU_Strength(2.0f)
                , GPU_LODParameters(Ogre::Vector3(0.5f, 50, 150000))
            {
            }
 
            Options(const int&           _Resolution,
                    const float&         _PhysicalResolution,
                    const float&         _Scale,
                    const Ogre::Vector2& _WindDirection,
                    const float&         _AnimationSpeed,
                    const float&         _KwPower,
                    const float&         _Amplitude,
                    const float &_GPU_Strength,
                    const Ogre::Vector3 &_GPU_LODParameters)
                : Resolution(_Resolution)
                , PhysicalResolution(_PhysicalResolution)
                , Scale(_Scale)
                , WindDirection(_WindDirection)
                , AnimationSpeed(_AnimationSpeed)
                , KwPower(_KwPower)
                , Amplitude(_Amplitude)
                , GPU_Strength(_GPU_Strength)
                , GPU_LODParameters(_GPU_LODParameters)
            {
            }
        };
 
        FFT();
 
        FFT(const Options &Options);
 
        ~FFT();
 
        void create();
 
        bool createGPUNormalMapResources(GPUNormalMapManager *g);
 
        void remove();
 
        void update(const Ogre::Real &timeSinceLastFrame);
 
        void saveCfg(Ogre::String &Data);
 
        bool loadCfg(Ogre::ConfigFile &CfgFile);
 
        float getValue(const float &x, const float &y);
 
        void setOptions(const Options &Options);
 
        inline const Options& getOptions() const
        {
            return mOptions;
        }
 
    private:
        void _initNoise();
 
        void _calculeNoise(const float &delta);
 
        void _executeInverseFFT();
 
        void _normalizeFFTData(const float& scale);
 
        const float _getPhillipsSpectrum(const Ogre::Vector2& waveVector, const Ogre::Vector2& wind, const float& kwPower_ = 2.0f) const;
 
        const float _getGaussianRandomFloat() const;
 
        void _updateGPUNormalMapResources();
 
        int resolution;
        float *re, *img;
        float maximalValue;
 
        std::complex<float> *initialWaves;
        std::complex<float> *currentWaves;
        float  *angularFrequencies;
        float time;
 
        GPUNormalMapManager *mGPUNormalMapManager;
 
        Options mOptions;
    };
}}
 
 
#endif