mirror of
https://github.com/HifiExperiments/overte.git
synced 2025-06-18 12:08:46 +02:00
126 lines
3.5 KiB
C++
126 lines
3.5 KiB
C++
#ifndef STK_HEVYMETL_H
|
|
#define STK_HEVYMETL_H
|
|
|
|
#include "FM.h"
|
|
|
|
namespace stk {
|
|
|
|
/***************************************************/
|
|
/*! \class HevyMetl
|
|
\brief STK heavy metal FM synthesis instrument.
|
|
|
|
This class implements 3 cascade operators with
|
|
feedback modulation, also referred to as
|
|
algorithm 3 of the TX81Z.
|
|
|
|
\code
|
|
Algorithm 3 is : 4--\
|
|
3-->2-- + -->1-->Out
|
|
\endcode
|
|
|
|
Control Change Numbers:
|
|
- Total Modulator Index = 2
|
|
- Modulator Crossfade = 4
|
|
- LFO Speed = 11
|
|
- LFO Depth = 1
|
|
- ADSR 2 & 4 Target = 128
|
|
|
|
The basic Chowning/Stanford FM patent expired
|
|
in 1995, but there exist follow-on patents,
|
|
mostly assigned to Yamaha. If you are of the
|
|
type who should worry about this (making
|
|
money) worry away.
|
|
|
|
by Perry R. Cook and Gary P. Scavone, 1995-2012.
|
|
*/
|
|
/***************************************************/
|
|
|
|
class HevyMetl : public FM
|
|
{
|
|
public:
|
|
//! Class constructor.
|
|
/*!
|
|
An StkError will be thrown if the rawwave path is incorrectly set.
|
|
*/
|
|
HevyMetl( void );
|
|
|
|
//! Class destructor.
|
|
~HevyMetl( void );
|
|
|
|
//! Start a note with the given frequency and amplitude.
|
|
void noteOn( StkFloat frequency, StkFloat amplitude );
|
|
|
|
//! Compute and return one output sample.
|
|
StkFloat tick( unsigned int channel = 0 );
|
|
|
|
//! Fill a channel of the StkFrames object with computed outputs.
|
|
/*!
|
|
The \c channel argument must be less than the number of
|
|
channels in the StkFrames argument (the first channel is specified
|
|
by 0). However, range checking is only performed if _STK_DEBUG_
|
|
is defined during compilation, in which case an out-of-range value
|
|
will trigger an StkError exception.
|
|
*/
|
|
StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
|
|
|
|
protected:
|
|
|
|
};
|
|
|
|
inline StkFloat HevyMetl :: tick( unsigned int )
|
|
{
|
|
register StkFloat temp;
|
|
|
|
temp = vibrato_.tick() * modDepth_ * 0.2;
|
|
waves_[0]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[0]);
|
|
waves_[1]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[1]);
|
|
waves_[2]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[2]);
|
|
waves_[3]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[3]);
|
|
|
|
temp = gains_[2] * adsr_[2]->tick() * waves_[2]->tick();
|
|
waves_[1]->addPhaseOffset( temp );
|
|
|
|
waves_[3]->addPhaseOffset( twozero_.lastOut() );
|
|
temp = (1.0 - (control2_ * 0.5)) * gains_[3] * adsr_[3]->tick() * waves_[3]->tick();
|
|
twozero_.tick(temp);
|
|
|
|
temp += control2_ * 0.5 * gains_[1] * adsr_[1]->tick() * waves_[1]->tick();
|
|
temp = temp * control1_;
|
|
|
|
waves_[0]->addPhaseOffset( temp );
|
|
temp = gains_[0] * adsr_[0]->tick() * waves_[0]->tick();
|
|
|
|
lastFrame_[0] = temp * 0.5;
|
|
return lastFrame_[0];
|
|
}
|
|
|
|
inline StkFrames& HevyMetl :: tick( StkFrames& frames, unsigned int channel )
|
|
{
|
|
unsigned int nChannels = lastFrame_.channels();
|
|
#if defined(_STK_DEBUG_)
|
|
if ( channel > frames.channels() - nChannels ) {
|
|
oStream_ << "HevyMetl::tick(): channel and StkFrames arguments are incompatible!";
|
|
handleError( StkError::FUNCTION_ARGUMENT );
|
|
}
|
|
#endif
|
|
|
|
StkFloat *samples = &frames[channel];
|
|
unsigned int j, hop = frames.channels() - nChannels;
|
|
if ( nChannels == 1 ) {
|
|
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
|
|
*samples++ = tick();
|
|
}
|
|
else {
|
|
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
|
|
*samples++ = tick();
|
|
for ( j=1; j<nChannels; j++ )
|
|
*samples++ = lastFrame_[j];
|
|
}
|
|
}
|
|
|
|
return frames;
|
|
}
|
|
|
|
} // stk namespace
|
|
|
|
#endif
|