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# Wurley.h

    00001 #ifndef STK_WURLEY_H
    00002 #define STK_WURLEY_H
    00003
    00004 #include "FM.h"
    00005
    00006 namespace stk {
    00007
    00008 /***************************************************/
    00038 /***************************************************/
    00039
    00040 class Wurley : public FM
    00041 {
    00042  public:
    00044
    00047   Wurley( void );
    00048
    00050   ~Wurley( void );
    00051
    00053   void setFrequency( StkFloat frequency );
    00054
    00056   void noteOn( StkFloat frequency, StkFloat amplitude );
    00057
    00059   StkFloat tick( unsigned int channel = 0 );
    00060
    00062
    00069   StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
    00070
    00071  protected:
    00072
    00073 };
    00074
    00075 inline StkFloat Wurley :: tick( unsigned int )
    00076 {
    00077   StkFloat temp, temp2;
    00078
    00079   temp = gains_[1] * adsr_[1]->tick() * waves_[1]->tick();
    00080   temp = temp * control1_;
    00081
    00082   waves_[0]->addPhaseOffset( temp );
    00083   waves_[3]->addPhaseOffset( twozero_.lastOut() );
    00084   temp = gains_[3] * adsr_[3]->tick() * waves_[3]->tick();
    00085   twozero_.tick(temp);
    00086
    00087   waves_[2]->addPhaseOffset( temp );
    00088   temp = ( 1.0 - (control2_ * 0.5)) * gains_[0] * adsr_[0]->tick() * waves_[0]->tick();
    00089   temp += control2_ * 0.5 * gains_[2] * adsr_[2]->tick() * waves_[2]->tick();
    00090
    00091   // Calculate amplitude modulation and apply it to output.
    00092   temp2 = vibrato_.tick() * modDepth_;
    00093   temp = temp * (1.0 + temp2);
    00094
    00095   lastFrame_[0] = temp * 0.5;
    00096   return lastFrame_[0];
    00097 }
    00098
    00099 inline StkFrames& Wurley :: tick( StkFrames& frames, unsigned int channel )
    00100 {
    00101   unsigned int nChannels = lastFrame_.channels();
    00102 #if defined(_STK_DEBUG_)
    00103   if ( channel > frames.channels() - nChannels ) {
    00104     oStream_ << "Wurley::tick(): channel and StkFrames arguments are incompatible!";
    00105     handleError( StkError::FUNCTION_ARGUMENT );
    00106   }
    00107 #endif
    00108
    00109   StkFloat *samples = &frames[channel];
    00110   unsigned int j, hop = frames.channels() - nChannels;
    00111   if ( nChannels == 1 ) {
    00112     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
    00113       *samples++ = tick();
    00114   }
    00115   else {
    00116     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
    00117       *samples++ = tick();
    00118       for ( j=1; j<nChannels; j++ )
    00119         *samples++ = lastFrame_[j];
    00120     }
    00121   }
    00122
    00123   return frames;
    00124 }
    00125
    00126 } // stk namespace
    00127
    00128 #endif

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