genish.js/js/sah.js

gen~ in js

'use strict'

let gen     = require( './gen.js' )

let proto = {
  basename:'sah',

  gen() {
    let inputs = gen.getInputs( this ), out

    //gen.data[ this.name ] = 0
    //gen.data[ this.name + '_control' ] = 0

    gen.requestMemory( this.memory )


    out = 
` var ${this.name}_control = memory[${this.memory.control.idx}],
      ${this.name}_trigger = ${inputs[1]} > ${inputs[2]} ? 1 : 0

  if( ${this.name}_trigger !== ${this.name}_control  ) {
    if( ${this.name}_trigger === 1 ) 
      memory[${this.memory.value.idx}] = ${inputs[0]}
    
    memory[${this.memory.control.idx}] = ${this.name}_trigger
  }
`
    
    gen.memo[ this.name ] = `memory[${this.memory.value.idx}]`//`gen.data.${this.name}`

    return [ `memory[${this.memory.value.idx}]`, ' ' +out ]
  }
}

module.exports = ( in1, control, threshold=0, properties ) => {
  let ugen = Object.create( proto ),
      defaults = { init:0 }

  if( properties !== undefined ) Object.assign( defaults, properties )

  Object.assign( ugen, { 
    lastSample: 0,
    uid:        gen.getUID(),
    inputs:     [ in1, control,threshold ],
    memory: {
      control: { idx:null, length:1 },
      value:   { idx:null, length:1 },
    }
  },
  defaults )
  
  ugen.name = `${ugen.basename}${ugen.uid}`

  return ugen
}