SynthLab::DynamicTableSource Class Reference

Storage for one dynamic table source; a wavetable that is created dynamically at load time, rather than being loaded from a static resource or table array. More...

#include <dynamictablesource.h>

Inheritance diagram for SynthLab::DynamicTableSource:

Public Member Functions
	DynamicTableSource ()
	empty constructor
	~DynamicTableSource ()
	empty destructor
virtual const char *	getWaveformName () override
virtual void	selectTable (uint32_t midiNoteNumber) override
	Select a table based on MIDI note number.
virtual double	readWaveTable (double normalizedPhaseInc) override
	Read and interpolate the table; uses linear interpolation but could be changed to 4th order LaGrange interpolation instead. More...
virtual uint32_t	getWaveTableLength () override
void	addWavetable (uint32_t startNoteNumber, uint32_t endNoteNumber, std::shared_ptr< double > _table, uint32_t length, const char *name)
	Adds a new wavetable or tables to the array of 128 tables, one for each MIDI note. More...
void	clearAllWavetables ()
	Clear out the wavetables to initialize or re-initialize.

Protected Attributes
DynamicWavetable	wavetableSet [NUM_MIDI_NOTES]
	— prefab table valid for all MIDI notes
DynamicWavetable	selectedTable
	— selected table, stored here

Detailed Description

Storage for one dynamic table source; a wavetable that is created dynamically at load time, rather than being loaded from a static resource or table array.

• exposes the IWavetableSource interface
• stores 128 DynamicWavetable objects, one for each MIDI note
• stores a selected table
• the owning object (a wavetable core) selects the table based on pitch during the update() phase, then makes calls to read the table during the render() phase
• see also DynamicWavetable

Author

Will Pirkle http://www.willpirkle.com

Remarks

This object is included and described in further detail in Designing Software Synthesizer Plugins in C++ 2nd Ed. by Will Pirkle

Version

Revision : 1.0

Date

Date : 2021 / 04 / 26

Member Function Documentation

addWavetable()

void SynthLab::DynamicTableSource::addWavetable ( uint32_t  startNoteNumber, uint32_t  endNoteNumber, std::shared_ptr< double >  _table, uint32_t  length, const char *  name  )

inline

Adds a new wavetable or tables to the array of 128 tables, one for each MIDI note.

• one table may be used to cover multiple MIDI notes
• if a single table is used for a single MIDI note, set the start and end numbers identically

Parameters

startNoteNumber	the MIDI note number of the first note to add the table
endNoteNumber	the MIDI note number of the last note to add the table
_table	the shared pointer to the table (array)
length	the size of the table (array)
name	the unique name of this table

getWaveformName()

virtual const char* SynthLab::DynamicTableSource::getWaveformName ( )

inlineoverridevirtual

Returns

name of selected string as const char*

Implements SynthLab::IWavetableSource.

getWaveTableLength()

virtual uint32_t SynthLab::DynamicTableSource::getWaveTableLength ( )

inlineoverridevirtual

Returns

the length of the selected wavetable

Implements SynthLab::IWavetableSource.

readWaveTable()

virtual double SynthLab::DynamicTableSource::readWaveTable ( double  normalizedPhaseInc )

inlineoverridevirtual

Read and interpolate the table; uses linear interpolation but could be changed to 4th order LaGrange interpolation instead.

Parameters

normalizedPhaseInc

the phase increment value; usually this is the mcounter member of a SynthClock object and is fo/fs where fo is the desired oscillator frequency

Implements SynthLab::IWavetableSource.

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The documentation for this class was generated from the following file:

• C:/RackAFX Projects/SynthLab_SDK/source/dynamictablesource.h