gibberish-dsp/js/oscillators/wavetable.js

Gibberish is designed to be an optimized API for audio synthesis using per-sample techniques.

let g = require( 'genish.js' ),
    ugen = require( '../ugen.js' )()

module.exports = function( Gibberish ) {

  const Wavetable = function( inputProps ) {
    const wavetable = Object.create( ugen )
    const props  = Object.assign({}, Gibberish.oscillators.defaults, inputProps )
    const osc = g.wavetable( g.in('frequency'), props )
    const graph = g.mul( 
      osc, 
      g.in( 'gain' )
    )

    Gibberish.factory( wavetable, graph, 'wavetable', props )

    return wavetable
  }

  g.wavetable = function( frequency, props ) {
    let dataProps = { immutable:true }

    // use global references if applicable
    if( props.name !== undefined ) dataProps.global = props.name

    const buffer = g.data( props.buffer, 1, dataProps )

    return g.peek( buffer, g.phasor( frequency, 0, { min:0 } ) )
  }

  return Wavetable
}