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# Mesh2D.h

    00001 #ifndef STK_MESH2D_H
    00002 #define STK_MESH2D_H
    00003
    00004 #include "Instrmnt.h"
    00005 #include "OnePole.h"
    00006
    00007 namespace stk {
    00008
    00009 /***************************************************/
    00033 /***************************************************/
    00034
    00035 const unsigned short NXMAX = 12;
    00036 const unsigned short NYMAX = 12;
    00037
    00038 class Mesh2D : public Instrmnt
    00039 {
    00040  public:
    00042   Mesh2D( unsigned short nX, unsigned short nY );
    00043
    00045   ~Mesh2D( void );
    00046
    00048   void clear( void );
    00049
    00051   void setNX( unsigned short lenX );
    00052
    00054   void setNY( unsigned short lenY );
    00055
    00057   void setInputPosition( StkFloat xFactor, StkFloat yFactor );
    00058
    00060   void setDecay( StkFloat decayFactor );
    00061
    00063   void noteOn( StkFloat frequency, StkFloat amplitude );
    00064
    00066   void noteOff( StkFloat amplitude );
    00067
    00069   StkFloat energy( void );
    00070
    00072   StkFloat inputTick( StkFloat input );
    00073
    00075   void controlChange( int number, StkFloat value );
    00076
    00078   StkFloat tick( unsigned int channel = 0 );
    00079
    00081
    00088   StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
    00089
    00090  protected:
    00091
    00092   StkFloat tick0();
    00093   StkFloat tick1();
    00094   void clearMesh();
    00095
    00096   unsigned short NX_, NY_;
    00097   unsigned short xInput_, yInput_;
    00098   OnePole  filterX_[NXMAX];
    00099   OnePole  filterY_[NYMAX];
    00100   StkFloat v_[NXMAX-1][NYMAX-1]; // junction velocities
    00101   StkFloat vxp_[NXMAX][NYMAX];   // positive-x velocity wave
    00102   StkFloat vxm_[NXMAX][NYMAX];   // negative-x velocity wave
    00103   StkFloat vyp_[NXMAX][NYMAX];   // positive-y velocity wave
    00104   StkFloat vym_[NXMAX][NYMAX];   // negative-y velocity wave
    00105
    00106   // Alternate buffers
    00107   StkFloat vxp1_[NXMAX][NYMAX];  // positive-x velocity wave
    00108   StkFloat vxm1_[NXMAX][NYMAX];  // negative-x velocity wave
    00109   StkFloat vyp1_[NXMAX][NYMAX];  // positive-y velocity wave
    00110   StkFloat vym1_[NXMAX][NYMAX];  // negative-y velocity wave
    00111
    00112   int counter_; // time in samples
    00113 };
    00114
    00115 inline StkFrames& Mesh2D :: tick( StkFrames& frames, unsigned int channel )
    00116 {
    00117   unsigned int nChannels = lastFrame_.channels();
    00118 #if defined(_STK_DEBUG_)
    00119   if ( channel > frames.channels() - nChannels ) {
    00120     oStream_ << "Mesh2D::tick(): channel and StkFrames arguments are incompatible!";
    00121     handleError( StkError::FUNCTION_ARGUMENT );
    00122   }
    00123 #endif
    00124
    00125   StkFloat *samples = &frames[channel];
    00126   unsigned int j, hop = frames.channels() - nChannels;
    00127   if ( nChannels == 1 ) {
    00128     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
    00129       *samples++ = tick();
    00130   }
    00131   else {
    00132     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
    00133       *samples++ = tick();
    00134       for ( j=1; j<nChannels; j++ )
    00135         *samples++ = lastFrame_[j];
    00136     }
    00137   }
    00138
    00139   return frames;
    00140 }
    00141
    00142 } // stk namespace
    00143
    00144 #endif

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