Spiral3D.cpp

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/** @file
 *
 * @ingroup dspTrajectoryLib
 *
 * @brief Spiral Unit in 3D for Jamoma DSP
 *
 * @details see http://mathworld.wolfram.com/SpiralsCurve.html and http://www.wolframalpha.com/entities/space_curves/spherical_spiral/lu/g9/pv/ for details @n
 * 
 * @authors Nils Peters
 *
 * @copyright Copyright © 2011 by Nils Peters @n
 * This code is licensed under the terms of the "New BSD License" @n
 * http://creativecommons.org/licenses/BSD/
 */

#include "Spiral3D.h"


#define thisTTClass         Spiral3D
#define thisTTClassName     "spherical.spiral.3D"
#define thisTTClassTags     "audio, trajectory, 3D, Spiral"


TT_AUDIO_CONSTRUCTOR
{   
    addAttribute(A, kTypeFloat64);
    setProcessMethod(processAudio);
//  setCalculateMethod(calculateValue);
}


Spiral3D::~Spiral3D()
{
    ;
}

//TTErr Spiral3D::calculateValue(const TTFloat64& x, TTFloat64& y, TTPtrSizedInt data)
//{
//  y = x;
//  return kTTErrNone;
//}


TTErr Spiral3D::processAudio(TTAudioSignalArrayPtr inputs, TTAudioSignalArrayPtr outputs)
{
    TTAudioSignal&      out = outputs->getSignal(0);
    TTChannelCount      numOutputChannels = out.getNumChannelsAsInt();
    
    if (numOutputChannels != 3) {
        TTValue v = 3;      
        out.setMaxNumChannels(v);
        out.setNumChannels(v);      
    }
    
    TTAudioSignal&      in0 = inputs->getSignal(0);
    TTUInt16             vs = in0.getVectorSizeAsInt();
    
    TTSampleValuePtr    inSampleX           = in0.mSampleVectors[0];
    TTSampleValuePtr    outSampleX          = out.mSampleVectors[0];
    TTSampleValuePtr    outSampleY          = out.mSampleVectors[1];
    TTSampleValuePtr    outSampleZ          = out.mSampleVectors[2];
    
    TTFloat64 phi, c;
    
    for (int i=0; i<vs; i++) {  
                        
        phi = inSampleX[i] * kTTTwoPi - kTTTwoPi; // -2Pi .. 2Pi
        c = sqrt(1 + mA*mA*phi*phi);
        outSampleX[i] = cos(phi)/c;
        outSampleY[i] = sin(phi)/c;
        outSampleZ[i] = -mA * phi/c;

    }
return kTTErrNone;
}