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Modal.h
1 #ifndef STK_MODAL_H
2 #define STK_MODAL_H
3 
4 #include "Instrmnt.h"
5 #include "Envelope.h"
6 #include "FileLoop.h"
7 #include "SineWave.h"
8 #include "BiQuad.h"
9 #include "OnePole.h"
10 
11 namespace stk {
12 
13 /***************************************************/
24 /***************************************************/
25 
26 class Modal : public Instrmnt
27 {
28 public:
30 
33  Modal( unsigned int modes = 4 );
34 
36  virtual ~Modal( void );
37 
39  void clear( void );
40 
42  virtual void setFrequency( StkFloat frequency );
43 
45  void setRatioAndRadius( unsigned int modeIndex, StkFloat ratio, StkFloat radius );
46 
48  void setMasterGain( StkFloat aGain ) { masterGain_ = aGain; };
49 
51  void setDirectGain( StkFloat aGain ) { directGain_ = aGain; };
52 
54  void setModeGain( unsigned int modeIndex, StkFloat gain );
55 
57  virtual void strike( StkFloat amplitude );
58 
60  void damp( StkFloat amplitude );
61 
63  void noteOn( StkFloat frequency, StkFloat amplitude );
64 
66  void noteOff( StkFloat amplitude );
67 
69  virtual void controlChange( int number, StkFloat value ) = 0;
70 
72  StkFloat tick( unsigned int channel = 0 );
73 
75 
82  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
83 
84 protected:
85 
86  Envelope envelope_;
87  FileWvIn *wave_;
88  BiQuad **filters_;
89  OnePole onepole_;
90  SineWave vibrato_;
91 
92  unsigned int nModes_;
93  std::vector<StkFloat> ratios_;
94  std::vector<StkFloat> radii_;
95 
96  StkFloat vibratoGain_;
97  StkFloat masterGain_;
98  StkFloat directGain_;
99  StkFloat stickHardness_;
100  StkFloat strikePosition_;
101  StkFloat baseFrequency_;
102 };
103 
104 inline StkFloat Modal :: tick( unsigned int )
105 {
106  StkFloat temp = masterGain_ * onepole_.tick( wave_->tick() * envelope_.tick() );
107 
108  StkFloat temp2 = 0.0;
109  for ( unsigned int i=0; i<nModes_; i++ )
110  temp2 += filters_[i]->tick(temp);
111 
112  temp2 -= temp2 * directGain_;
113  temp2 += directGain_ * temp;
114 
115  if ( vibratoGain_ != 0.0 ) {
116  // Calculate AM and apply to master out
117  temp = 1.0 + ( vibrato_.tick() * vibratoGain_ );
118  temp2 = temp * temp2;
119  }
120 
121  lastFrame_[0] = temp2;
122  return lastFrame_[0];
123 }
124 
125 inline StkFrames& Modal :: tick( StkFrames& frames, unsigned int channel )
126 {
127  unsigned int nChannels = lastFrame_.channels();
128 #if defined(_STK_DEBUG_)
129  if ( channel > frames.channels() - nChannels ) {
130  oStream_ << "Modal::tick(): channel and StkFrames arguments are incompatible!";
131  handleError( StkError::FUNCTION_ARGUMENT );
132  }
133 #endif
134 
135  StkFloat *samples = &frames[channel];
136  unsigned int j, hop = frames.channels() - nChannels;
137  if ( nChannels == 1 ) {
138  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
139  *samples++ = tick();
140  }
141  else {
142  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
143  *samples++ = tick();
144  for ( j=1; j<nChannels; j++ )
145  *samples++ = lastFrame_[j];
146  }
147  }
148 
149  return frames;
150 }
151 
152 } // stk namespace
153 
154 #endif

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