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FormSwep.h
1 #ifndef STK_FORMSWEP_H
2 #define STK_FORMSWEP_H
3
4 #include "Filter.h"
5
6 namespace stk {
7
8 /***************************************************/
18 /***************************************************/
19
20 class FormSwep : public Filter
21 {
22 public:
23
25 FormSwep( void );
26
28 ~FormSwep();
29
31 void ignoreSampleRateChange( bool ignore = true ) { ignoreSampleRateChange_ = ignore; };
32
34
47 void setResonance( StkFloat frequency, StkFloat radius );
48
50 void setStates( StkFloat frequency, StkFloat radius, StkFloat gain = 1.0 );
51
53 void setTargets( StkFloat frequency, StkFloat radius, StkFloat gain = 1.0 );
54
56
64 void setSweepRate( StkFloat rate );
65
67
72 void setSweepTime( StkFloat time );
73
75 StkFloat lastOut( void ) const { return lastFrame_[0]; };
76
78 StkFloat tick( StkFloat input );
79
81
89 StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
90
92
100 StkFrames& tick( StkFrames& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 );
101
102 protected:
103
104 virtual void sampleRateChanged( StkFloat newRate, StkFloat oldRate );
105
106 bool dirty_;
107 StkFloat frequency_;
108 StkFloat radius_;
109 StkFloat startFrequency_;
110 StkFloat startRadius_;
111 StkFloat startGain_;
112 StkFloat targetFrequency_;
113 StkFloat targetRadius_;
114 StkFloat targetGain_;
115 StkFloat deltaFrequency_;
116 StkFloat deltaRadius_;
117 StkFloat deltaGain_;
118 StkFloat sweepState_;
119 StkFloat sweepRate_;
120
121 };
122
123 inline StkFloat FormSwep :: tick( StkFloat input )
124 {
125 if ( dirty_ ) {
126 sweepState_ += sweepRate_;
127 if ( sweepState_ >= 1.0 ) {
128 sweepState_ = 1.0;
129 dirty_ = false;
130 radius_ = targetRadius_;
131 frequency_ = targetFrequency_;
132 gain_ = targetGain_;
133 }
134 else {
135 radius_ = startRadius_ + (deltaRadius_ * sweepState_);
136 frequency_ = startFrequency_ + (deltaFrequency_ * sweepState_);
137 gain_ = startGain_ + (deltaGain_ * sweepState_);
138 }
139 this->setResonance( frequency_, radius_ );
140 }
141
142 inputs_[0] = gain_ * input;
143 lastFrame_[0] = b_[0] * inputs_[0] + b_[1] * inputs_[1] + b_[2] * inputs_[2];
144 lastFrame_[0] -= a_[2] * outputs_[2] + a_[1] * outputs_[1];
145 inputs_[2] = inputs_[1];
146 inputs_[1] = inputs_[0];
147 outputs_[2] = outputs_[1];
148 outputs_[1] = lastFrame_[0];
149
150 return lastFrame_[0];
151 }
152
153 inline StkFrames& FormSwep :: tick( StkFrames& frames, unsigned int channel )
154 {
155 #if defined(_STK_DEBUG_)
156 if ( channel >= frames.channels() ) {
157 oStream_ << "FormSwep::tick(): channel and StkFrames arguments are incompatible!";
158 handleError( StkError::FUNCTION_ARGUMENT );
159 }
160 #endif
161
162 StkFloat *samples = &frames[channel];
163 unsigned int hop = frames.channels();
164 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
165 *samples = tick( *samples );
166
167 return frames;
168 }
169
170 inline StkFrames& FormSwep :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
171 {
172 #if defined(_STK_DEBUG_)
173 if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
174 oStream_ << "FormSwep::tick(): channel and StkFrames arguments are incompatible!";
175 handleError( StkError::FUNCTION_ARGUMENT );
176 }
177 #endif
178
179 StkFloat *iSamples = &iFrames[iChannel];
180 StkFloat *oSamples = &oFrames[oChannel];
181 unsigned int iHop = iFrames.channels(), oHop = oFrames.channels();
182 for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop )
183 *oSamples = tick( *iSamples );
184
185 return iFrames;
186 }
187
188 } // stk namespace
189
190 #endif

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