genish.js/js/rate.js

gen~ in js

'use strict'

let gen     = require( './gen.js' ),
    history = require( './history.js' ),
    sub     = require( './sub.js' ),
    add     = require( './add.js' ),
    mul     = require( './mul.js' ),
    memo    = require( './memo.js' ),
    delta   = require( './delta.js' ),
    wrap    = require( './wrap.js' )

let proto = {
  basename:'rate',

  gen() {
    let inputs = gen.getInputs( this ),
        phase  = history(),
        inMinus1 = history(),
        genName = 'gen.' + this.name,
        filter, sum, out

    gen.closures.add({ [ this.name ]: this }) 

    out = 
` var ${this.name}_diff = ${inputs[0]} - ${genName}.lastSample
  if( ${this.name}_diff < -.5 ) ${this.name}_diff += 1
  ${genName}.phase += ${this.name}_diff * ${inputs[1]}
  if( ${genName}.phase > 1 ) ${genName}.phase -= 1
  ${genName}.lastSample = ${inputs[0]}
`
    out = ' ' + out

    return [ genName + '.phase', out ]
  }
}

module.exports = ( in1, rate ) => {
  let ugen = Object.create( proto )

  Object.assign( ugen, { 
    phase:      0,
    lastSample: 0,
    uid:        gen.getUID(),
    inputs:     [ in1, rate ],
  })
  
  ugen.name = `${ugen.basename}${ugen.uid}`

  return ugen
}