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https://github.com/thestk/stk
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108 lines
3.0 KiB
C++
108 lines
3.0 KiB
C++
#ifndef STK_MESH2D_H
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#define STK_MESH2D_H
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#include "Instrmnt.h"
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#include "OnePole.h"
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namespace stk {
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/***************************************************/
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/*! \class Mesh2D
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\brief Two-dimensional rectilinear waveguide mesh class.
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This class implements a rectilinear,
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two-dimensional digital waveguide mesh
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structure. For details, see Van Duyne and
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Smith, "Physical Modeling with the 2-D Digital
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Waveguide Mesh", Proceedings of the 1993
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International Computer Music Conference.
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This is a digital waveguide model, making its
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use possibly subject to patents held by Stanford
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University, Yamaha, and others.
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Control Change Numbers:
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- X Dimension = 2
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- Y Dimension = 4
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- Mesh Decay = 11
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- X-Y Input Position = 1
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by Julius Smith, 2000 - 2002.
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Revised by Gary Scavone for STK, 2002.
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*/
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/***************************************************/
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const short NXMAX = 12;
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const short NYMAX = 12;
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class Mesh2D : public Instrmnt
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{
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public:
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//! Class constructor, taking the x and y dimensions in samples.
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Mesh2D( short nX, short nY );
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//! Class destructor.
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~Mesh2D( void );
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//! Reset and clear all internal state.
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void clear( void );
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//! Set the x dimension size in samples.
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void setNX( short lenX );
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//! Set the y dimension size in samples.
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void setNY( short lenY );
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//! Set the x, y input position on a 0.0 - 1.0 scale.
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void setInputPosition( StkFloat xFactor, StkFloat yFactor );
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//! Set the loss filters gains (0.0 - 1.0).
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void setDecay( StkFloat decayFactor );
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//! Impulse the mesh with the given amplitude (frequency ignored).
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void noteOn( StkFloat frequency, StkFloat amplitude );
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//! Stop a note with the given amplitude (speed of decay) ... currently ignored.
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void noteOff( StkFloat amplitude );
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//! Calculate and return the signal energy stored in the mesh.
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StkFloat energy( void );
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//! Input a sample to the mesh and compute one output sample.
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StkFloat inputTick( StkFloat input );
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//! Perform the control change specified by \e number and \e value (0.0 - 128.0).
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void controlChange( int number, StkFloat value );
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//! Compute and return one output sample.
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StkFloat tick( unsigned int channel = 0 );
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protected:
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StkFloat tick0();
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StkFloat tick1();
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void clearMesh();
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short NX_, NY_;
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short xInput_, yInput_;
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OnePole filterX_[NXMAX];
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OnePole filterY_[NYMAX];
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StkFloat v_[NXMAX-1][NYMAX-1]; // junction velocities
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StkFloat vxp_[NXMAX][NYMAX]; // positive-x velocity wave
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StkFloat vxm_[NXMAX][NYMAX]; // negative-x velocity wave
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StkFloat vyp_[NXMAX][NYMAX]; // positive-y velocity wave
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StkFloat vym_[NXMAX][NYMAX]; // negative-y velocity wave
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// Alternate buffers
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StkFloat vxp1_[NXMAX][NYMAX]; // positive-x velocity wave
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StkFloat vxm1_[NXMAX][NYMAX]; // negative-x velocity wave
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StkFloat vyp1_[NXMAX][NYMAX]; // positive-y velocity wave
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StkFloat vym1_[NXMAX][NYMAX]; // negative-y velocity wave
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int counter_; // time in samples
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};
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} // stk namespace
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#endif
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