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namespace LinuxSampler { |
namespace LinuxSampler { |
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template<typename T> |
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class FixedArray { |
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public: |
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FixedArray(int capacity) { |
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iSize = 0; |
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iCapacity = capacity; |
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pData = new T[iCapacity]; |
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} |
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~FixedArray() { |
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delete pData; |
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pData = NULL; |
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} |
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inline int size() const { return iSize; } |
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inline int capacity() { return iCapacity; } |
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void add(T element) { |
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if (iSize >= iCapacity) throw Exception("Array out of bounds"); |
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pData[iSize++] = element; |
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} |
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T increment() { |
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if (iSize >= iCapacity) throw Exception("Array out of bounds"); |
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return pData[iSize++]; |
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} |
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void clear() { iSize = 0; } |
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void copy(const FixedArray<T>& array) { |
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if(array.size() >= capacity()) throw Exception("Not enough space to copy array"); |
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for (int i = 0; i < array.size(); i++) pData[i] = array[i]; |
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iSize = array.size(); |
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} |
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inline T& operator[](int idx) const { |
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return pData[idx]; |
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} |
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private: |
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T* pData; |
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int iSize; |
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int iCapacity; |
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}; |
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class SignalUnitRack; |
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/** |
/** |
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* A signal unit consist of internal signal generator (like envelope generator, |
* A signal unit consist of internal signal generator (like envelope generator, |
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* low frequency oscillator, etc) with a number of generator parameters which |
* low frequency oscillator, etc) with a number of generator parameters which |
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* influence/modulate/dynamically change the generator's signal in some manner. |
* influence/modulate/dynamically change the generator's signal in some manner. |
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* The generators' parameters (also called signal unit parameters) can receive |
* Each generator parameter (also called signal unit parameter) can receive |
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* the signal of one or more signal units (through modulators if need) |
* signal from another signal unit and use this signal to dynamically change the |
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* and use the (modulated) signals of those units to dynamically change the |
* behavior of the signal generator. In turn, the signal of this unit can be fed |
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* behavior of the signal generator. In turn, the signal of those unit can be fed |
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* to another unit(s) and influence its parameters. |
* to another unit(s) and influence its parameters. |
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*/ |
*/ |
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class SignalUnit { |
class SignalUnit { |
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public: |
public: |
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/** |
/** |
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* Used as an intermediate link between a source signal unit and |
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* a destination unit parameter. Modulates the received signal from the |
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* source unit and feed it to the unit parameter to which it is connected. |
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*/ |
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class Modulator { |
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public: |
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SignalUnit* pUnit; /* The signal source which will be used for modulation. |
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* If pUnit is NULL the level is considered to be 1! |
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*/ |
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float Coeff; // The modulation coefficient |
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Modulator() : pUnit(NULL) { } |
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Modulator(SignalUnit* Unit) { pUnit = Unit; } |
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Modulator(const Modulator& Mod) { Copy(Mod); } |
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void operator=(const Modulator& Mod) { Copy(Mod); } |
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virtual void Copy(const Modulator& Mod) { |
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if (this == &Mod) return; |
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pUnit = Mod.pUnit; |
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Coeff = Mod.Coeff; |
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} |
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/** |
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* Gets the normalized level of the signal source for the current |
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* time step (sample point). Returns 1 if source unit is NULL or |
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* if the source unit is inactive. |
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*/ |
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virtual float GetLevel() { |
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if (pUnit == NULL) return 1.0f; |
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return pUnit->Active() ? pUnit->GetLevel() : 1.0f; |
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} |
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/** |
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* Gets the modulated level of the source signal |
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* for the current time step (sample point). |
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*/ |
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virtual float GetValue() { |
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return Transform(GetLevel()); |
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} |
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/** |
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* Calculates the transformation that should be applied |
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* to the signal of the source unit and multiplies by Coeff. |
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* This implementation of the method just multiplies by Coeff, |
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* or returns 1 if the source unit is inactive. |
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*/ |
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virtual float Transform(float val) { |
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if (pUnit != NULL && !pUnit->Active()) return 1; |
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return val * Coeff; |
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} |
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}; |
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/** |
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* This class represents a parameter which will influence the signal |
* This class represents a parameter which will influence the signal |
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* unit to which it belongs in certain way. |
* unit to which it belongs in certain way. |
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* For example, let's say the signal unit is a low frequency oscillator |
* For example, let's say the signal unit is a low frequency oscillator |
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* with frequency 1Hz. If we want to modulate the LFO to start with 1Hz |
* with frequency 1Hz. If we want to modulate the LFO to start with 1Hz |
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* and increment its frequency to 5Hz in 1 second, we can add |
* and increment its frequency to 5Hz in 1 second, we can add |
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* a parameter with one modulator which signal source is an envelope |
* a parameter which signal source is an envelope |
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* generator with attack time of 1 second and coefficient 4. Thus, the |
* generator with attack time of 1 second and coefficient 4. Thus, the |
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* normalized level of the EG will move from 0 to 1 in one second. |
* normalized level of the EG will move from 0 to 1 in one second. |
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* On every time step (sample point) the normalized level |
* On every time step (sample point) the normalized level |
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*/ |
*/ |
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class Parameter { |
class Parameter { |
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public: |
public: |
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ArrayList<Modulator> Modulators; // A list of signal units which will modulate this parameter |
SignalUnit* pUnit; /* The source unit whose output signal |
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* will modulate the parameter. |
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SignalUnit* pUnit; /* If pUnit is not NULL, the modulators are ignored and |
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* this unit is used as only source. |
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* This is done for efficiency reasons. |
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*/ |
*/ |
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float Coeff; // The global modulation coefficient |
float Coeff; // The modulation coefficient |
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Parameter() : Coeff(1), pUnit(NULL) { } |
Parameter() : Coeff(1), pUnit(NULL) { } |
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/** |
/** |
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* Most often we just need to directly feed the signal of single unit |
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* to a unit parameter without any additional modulation. |
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* This constructor creates a parameter with only a single source |
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* unit without additional modulation, optimized for efficiency. |
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* @param unit The source unit used to influence this parameter. |
* @param unit The source unit used to influence this parameter. |
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* @param coeff The coefficient by which the normalized signal |
* @param coeff The coefficient by which the normalized signal |
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* received from the source unit should be multiplied when a |
* received from the source unit should be multiplied when a |
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Parameter(const Parameter& Prm) { Copy(Prm); } |
Parameter(const Parameter& Prm) { Copy(Prm); } |
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void operator=(const Parameter& Prm) { Copy(Prm); } |
void operator=(const Parameter& Prm) { Copy(Prm); } |
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virtual void Copy(const Parameter& Prm) { |
void Copy(const Parameter& Prm) { |
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if (this == &Prm) return; |
if (this == &Prm) return; |
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Modulators = Prm.Modulators; |
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pUnit = Prm.pUnit; |
pUnit = Prm.pUnit; |
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Coeff = Prm.Coeff; |
Coeff = Prm.Coeff; |
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} |
} |
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/** |
/** |
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* Calculates the global transformation for this parameter |
* Calculates the transformation for this parameter |
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* which should be applied to the parameter's value |
* which should be applied to the parameter's value |
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* and multiplies by Coeff. |
* and multiplies by Coeff. |
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* This implementation of the method just multiplies by Coeff. |
* This implementation of the method just multiplies by Coeff. |
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} |
} |
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/** |
/** |
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* Gets the current value of the parameter (without transformation). |
* Gets the current value of the parameter. |
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* This implementation just sum the modulators values. |
* This implementation returns the current signal level of the |
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* If only a single unit is used without additional modulation |
* source unit with applied transformation if the source unit is |
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* returns the source unit's level or 1 if the unit is not active. |
* active, otherwise returns 1. |
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* Note that this method assume that pUnit is not NULL. |
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*/ |
*/ |
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virtual float GetValue() { |
virtual float GetValue() { |
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if (pUnit != NULL) { |
return pUnit->Active() ? Transform(pUnit->GetLevel()) : 1.0f; |
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return pUnit->Active() ? pUnit->GetLevel() : 1.0f; |
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} |
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float val = 0; |
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for(int i = 0; i < Modulators.size(); i++) { |
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val += Modulators[i].GetValue(); |
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} |
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return val; |
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} |
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/** Gets the final value - with applied transformation. */ |
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virtual float GetFinalValue() { |
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return Transform(GetValue()); |
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} |
} |
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}; |
}; |
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public: |
public: |
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ArrayList<SignalUnit::Parameter> Params; // The list of parameters which are modulating the signal unit |
ArrayList<SignalUnit::Parameter> Params; // The list of parameters which are modulating the signal unit |
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SignalUnit() : bActive(false), Level(0.0f), bCalculating(false), uiDelayTrigger(0) { } |
SignalUnit(SignalUnitRack* rack): pRack(rack), bActive(false), Level(0.0f), bCalculating(false), uiDelayTrigger(0) { } |
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SignalUnit(const SignalUnit& Unit) { Copy(Unit); } |
SignalUnit(const SignalUnit& Unit): pRack(Unit.pRack) { Copy(Unit); } |
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void operator=(const SignalUnit& Unit) { Copy(Unit); } |
void operator=(const SignalUnit& Unit) { Copy(Unit); } |
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virtual void Copy(const SignalUnit& Unit) { |
void Copy(const SignalUnit& Unit) { |
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if (this == &Unit) return; |
if (this == &Unit) return; |
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bActive = Unit.bActive; |
bActive = Unit.bActive; |
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*/ |
*/ |
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virtual void Increment() { bRecalculate = true; } |
virtual void Increment() { bRecalculate = true; } |
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/** Initializes and triggers the unit. */ |
/** |
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* Initializes and triggers the unit. |
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* Note that when a voice is the owner of a unit rack, all settings |
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* should be reset when this method is called, because the sampler |
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* is reusing the voice objects. |
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*/ |
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virtual void Trigger() = 0; |
virtual void Trigger() = 0; |
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/** |
/** |
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*/ |
*/ |
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virtual uint DelayTrigger() { return uiDelayTrigger; } |
virtual uint DelayTrigger() { return uiDelayTrigger; } |
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/** |
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* A helper method which checks whether the delay |
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* stage is finished. |
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*/ |
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bool DelayStage(); |
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protected: |
protected: |
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SignalUnitRack* const pRack; |
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bool bActive; /* Don't use it to check the active state of the unit!!! |
bool bActive; /* Don't use it to check the active state of the unit!!! |
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* Use Active() instead! */ |
* Use Active() instead! */ |
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float Level; |
float Level; |
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}; |
}; |
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class EndpointSignalUnit: virtual public SignalUnit { |
class EndpointSignalUnit: public SignalUnit { |
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public: |
public: |
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EndpointSignalUnit(SignalUnitRack* rack): SignalUnit(rack) { } |
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/** |
/** |
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* Gets the volume modulation value |
* Gets the volume modulation value |
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* for the current time step (sample point). |
* for the current time step (sample point). |
297 |
*/ |
*/ |
298 |
virtual float GetResonance() = 0; |
virtual float GetResonance() = 0; |
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virtual float CalculateFilterCutoff(float cutoff) = 0; |
/** Should return value in the range [-100, 100] (L <-> R) */ |
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virtual float GetPan() = 0; |
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virtual float CalculatePitch(float pitch) = 0; |
virtual float CalculateFilterCutoff(float cutoff) { |
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cutoff *= GetFilterCutoff(); |
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return cutoff > 13500 ? 13500 : cutoff; |
306 |
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} |
307 |
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308 |
virtual float CalculateResonance(float res) = 0; |
virtual float CalculatePitch(float pitch) { |
309 |
}; |
return GetPitch() * pitch; |
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} |
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class SignalUnitRack; |
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template <class O /* The signal unit's owner */> |
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class SignalUnitBase: virtual public SignalUnit { |
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public: |
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SignalUnitBase() : pOwner(NULL) { } |
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SignalUnitBase(const SignalUnitBase& Unit) { Copy(Unit); } |
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void operator=(const SignalUnitBase& Unit) { Copy(Unit); } |
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312 |
virtual void Copy(const SignalUnitBase& Unit) { |
virtual float CalculateResonance(float res) { |
313 |
if (this == &Unit) return; |
return GetResonance() * res; |
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pOwner = Unit.pOwner; |
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SignalUnit::Copy(Unit); |
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} |
} |
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316 |
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/** Should return value in the range [0, 127] (L <-> R) */ |
317 |
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virtual uint8_t CaluclatePan(uint8_t pan) { |
318 |
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int p = pan + GetPan() * 0.63; |
319 |
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if (p < 0) return 0; |
320 |
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if (p > 127) return 127; |
321 |
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return p; |
322 |
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} |
323 |
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}; |
324 |
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325 |
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/** |
326 |
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* Used to smooth out the parameter changes. |
327 |
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*/ |
328 |
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class Smoother { |
329 |
protected: |
protected: |
330 |
O* pOwner; // The owner to which this rack belongs. |
uint timeSteps; // The number of time steps to reach the goal |
331 |
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uint currentTimeStep; |
332 |
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uint8_t goal; // 0 - 127 |
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uint8_t prev; // 0 - 127 |
334 |
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SignalUnitRack* GetSignalUnitRack() { return pOwner->GetSignalUnitRack(); } |
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335 |
public: |
public: |
336 |
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/** |
337 |
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* |
338 |
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* @param time The time (in seconds) to reach the goal |
339 |
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* @param sampleRate |
340 |
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* @param val The initial value |
341 |
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*/ |
342 |
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void trigger(float time, float sampleRate, uint8_t val = 0) { |
343 |
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currentTimeStep = timeSteps = time * sampleRate; |
344 |
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prev = goal = val; |
345 |
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} |
346 |
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347 |
/** |
/** |
348 |
* The owner of the unit is set by the rack |
* Set the current value, which the smoother will not smooth out. |
349 |
* just before the call to the unit's trigger method. |
* If you want the value to be smoothen out, use update() instead. |
350 |
*/ |
*/ |
351 |
void SetOwner(O* Owner) { pOwner = Owner; } |
void setValue( uint8_t val) { |
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currentTimeStep = timeSteps; |
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prev = goal = val; |
354 |
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} |
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/** |
/** |
357 |
* A helper method which checks whether the delay |
* Sets a new value. The render function will return |
358 |
* stage is finished. |
* values gradually approaching this value. |
359 |
*/ |
*/ |
360 |
bool DelayStage() { |
void update(uint8_t val) { |
361 |
return (DelayTrigger() >= GetSignalUnitRack()->GetCurrentStep()); |
if (val == goal) return; |
362 |
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363 |
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prev = prev + (goal - prev) * (currentTimeStep / (float)timeSteps); |
364 |
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goal = val; |
365 |
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currentTimeStep = 0; |
366 |
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} |
367 |
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368 |
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uint8_t render() { |
369 |
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if (currentTimeStep >= timeSteps) return goal; |
370 |
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return prev + (goal - prev) * (currentTimeStep++ / (float)timeSteps); |
371 |
} |
} |
372 |
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373 |
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bool isSmoothingOut() { return currentTimeStep < timeSteps; } |
374 |
}; |
}; |
375 |
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376 |
/** |
/** |
377 |
* Continuous controller signal unit. |
* Continuous controller signal unit. |
378 |
* The level of this unit corresponds to the controller changes |
* The level of this unit corresponds to the controllers changes |
379 |
* and is normalized to be in the range from -1 to +1. |
* and their influences. |
380 |
*/ |
*/ |
381 |
template<class O> |
class CCSignalUnit: public SignalUnit { |
382 |
class CCSignalUnit: public SignalUnitBase<O> { |
public: |
383 |
private: |
/** Listener which will be notified when the level of the unit is changed. */ |
384 |
uint8_t Ctrl; // The number of the MIDI controller which modulates this signal unit. |
class Listener { |
385 |
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public: |
386 |
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virtual void ValueChanged(CCSignalUnit* pUnit) = 0; |
387 |
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}; |
388 |
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389 |
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protected: |
390 |
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class CC { |
391 |
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public: |
392 |
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uint8_t Controller; ///< MIDI controller number. |
393 |
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uint8_t Value; ///< Controller Value. |
394 |
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short int Curve; ///< specifies the curve type |
395 |
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float Influence; |
396 |
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397 |
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Smoother* pSmoother; |
398 |
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399 |
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CC(uint8_t Controller = 0, float Influence = 0.0f, short int Curve = -1, Smoother* pSmoother = NULL) { |
400 |
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this->Controller = Controller; |
401 |
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this->Value = 0; |
402 |
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this->Curve = Curve; |
403 |
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this->Influence = Influence; |
404 |
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this->pSmoother = pSmoother; |
405 |
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} |
406 |
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407 |
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CC(const CC& cc) { Copy(cc); } |
408 |
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void operator=(const CC& cc) { Copy(cc); } |
409 |
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410 |
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void Copy(const CC& cc) { |
411 |
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Controller = cc.Controller; |
412 |
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Value = cc.Value; |
413 |
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Influence = cc.Influence; |
414 |
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Curve = cc.Curve; |
415 |
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pSmoother = cc.pSmoother; |
416 |
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} |
417 |
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}; |
418 |
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419 |
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FixedArray<CC> Ctrls; // The MIDI controllers which modulates this signal unit. |
420 |
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Listener* pListener; |
421 |
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bool hasSmoothCtrls; // determines whether there are smooth controllers (used for optimization) |
422 |
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bool isSmoothingOut; // determines whether there is a CC which is in process of smoothing out (used for optimization) |
423 |
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424 |
public: |
public: |
425 |
CCSignalUnit(uint8_t Controller) { |
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426 |
Ctrl = Controller; |
CCSignalUnit(SignalUnitRack* rack, Listener* l = NULL): SignalUnit(rack), Ctrls(128) { |
427 |
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pListener = l; |
428 |
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hasSmoothCtrls = isSmoothingOut = false; |
429 |
} |
} |
430 |
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431 |
CCSignalUnit(const CCSignalUnit& Unit) { Copy(Unit); } |
CCSignalUnit(const CCSignalUnit& Unit): SignalUnit(Unit.pRack), Ctrls(128) { Copy(Unit); } |
432 |
void operator=(const CCSignalUnit& Unit) { Copy(Unit); } |
void operator=(const CCSignalUnit& Unit) { Copy(Unit); } |
433 |
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|
434 |
virtual void Copy(const CCSignalUnit& Unit) { |
void Copy(const CCSignalUnit& Unit) { |
435 |
SignalUnitBase<O>::Copy(Unit); |
Ctrls.copy(Unit.Ctrls); |
436 |
Ctrl = Unit.Ctrl; |
pListener = Unit.pListener; |
437 |
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hasSmoothCtrls = Unit.hasSmoothCtrls; |
438 |
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isSmoothingOut = Unit.isSmoothingOut; |
439 |
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SignalUnit::Copy(Unit); |
440 |
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} |
441 |
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442 |
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void AddCC(uint8_t Controller, float Influence, short int Curve = -1, Smoother* pSmoother = NULL) { |
443 |
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Ctrls.add(CC(Controller, Influence, Curve, pSmoother)); |
444 |
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if (pSmoother != NULL) hasSmoothCtrls = true; |
445 |
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} |
446 |
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447 |
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void RemoveAllCCs() { |
448 |
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Ctrls.clear(); |
449 |
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} |
450 |
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451 |
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virtual void Increment() { |
452 |
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if (hasSmoothCtrls && isSmoothingOut) Calculate(); |
453 |
} |
} |
454 |
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|
455 |
virtual void Increment() { } |
virtual void Trigger() { |
456 |
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Calculate(); |
457 |
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bActive = Level != 0; |
458 |
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} |
459 |
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|
460 |
virtual void ProcessCCEvent(uint8_t Controller, uint8_t Value) { |
virtual void ProcessCCEvent(uint8_t Controller, uint8_t Value) { |
461 |
if (Controller != Ctrl) return; |
bool recalculate = false; |
462 |
|
|
463 |
// Normalize the value so it belongs to the interval [-1, +1] |
for (int i = 0; i < Ctrls.size(); i++) { |
464 |
SignalUnitBase<O>::Level = 2 * Value; |
if (Controller != Ctrls[i].Controller) continue; |
465 |
SignalUnitBase<O>::Level = SignalUnitBase<O>::Level/127.0f - 1.0f; |
if (Ctrls[i].Value == Value) continue; |
466 |
|
Ctrls[i].Value = Value; |
467 |
|
if (Ctrls[i].pSmoother != NULL) Ctrls[i].pSmoother->update(Value); |
468 |
|
if (!bActive) bActive = true; |
469 |
|
recalculate = true; |
470 |
|
} |
471 |
|
|
472 |
if (!SignalUnitBase<O>::bActive) SignalUnitBase<O>::bActive = true; |
if (!(hasSmoothCtrls && isSmoothingOut) && recalculate) Calculate(); |
|
} |
|
|
}; |
|
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|
|
|
/** |
|
|
* Endpoint signal unit. |
|
|
*/ |
|
|
template<class O> |
|
|
class EndpointSignalUnitBase : public SignalUnitBase<O>, public EndpointSignalUnit { |
|
|
public: |
|
|
|
|
|
virtual float CalculateFilterCutoff(float cutoff) { |
|
|
return GetFilterCutoff() * cutoff; |
|
473 |
} |
} |
474 |
|
|
475 |
virtual float CalculatePitch(float pitch) { |
virtual void Calculate() { |
476 |
return GetPitch() * pitch; |
float l = 0; |
477 |
|
isSmoothingOut = false; |
478 |
|
for (int i = 0; i < Ctrls.size(); i++) { |
479 |
|
if (Ctrls[i].pSmoother == NULL) { |
480 |
|
l += Normalize(Ctrls[i].Value, Ctrls[i].Curve) * Ctrls[i].Influence; |
481 |
|
} else { |
482 |
|
if (Ctrls[i].pSmoother->isSmoothingOut()) isSmoothingOut = true; |
483 |
|
l += Normalize(Ctrls[i].pSmoother->render(), Ctrls[i].Curve) * Ctrls[i].Influence; |
484 |
|
} |
485 |
|
} |
486 |
|
if (Level != l) { |
487 |
|
Level = l; |
488 |
|
if (pListener != NULL) pListener->ValueChanged(this); |
489 |
|
} |
490 |
} |
} |
491 |
|
|
492 |
virtual float CalculateResonance(float res) { |
virtual float Normalize(uint8_t val, short int curve = -1) { |
493 |
return GetResonance() * res; |
return val / 127.0f; |
494 |
} |
} |
495 |
}; |
}; |
496 |
|
|