index.js

const Output = require('./src/output.js')
const loop = require('raf-loop')
const Source = require('./src/hydra-source.js')
const GeneratorFactory = require('./src/GeneratorFactory.js')
const getUserMedia = require('getusermedia')
const mouse = require('mouse-change')()
const Audio = require('./src/audio.js')
const VidRecorder = require('./src/video-recorder.js')

// to do: add ability to pass in certain uniforms and transforms
class HydraSynth {

  constructor ({
    pb = null,
    width = 1280,
    height = 720,
    numSources = 4,
    numOutputs = 4,
    makeGlobal = true,
    autoLoop = true,
    detectAudio = true,
    enableStreamCapture = true,
    canvas
  } = {}) {

    this.bpm = 60
    this.pb = pb
    this.width = width
    this.height = height
    this.time = 0
    this.makeGlobal = makeGlobal
    this.renderAll = false
    this.detectAudio = detectAudio

    // boolean to store when to save screenshot
    this.saveFrame = false

    // if stream capture is enabled, this object contains the capture stream
    this.captureStream = null

    this._initCanvas(canvas)
    this._initRegl()
    this._initOutputs(numOutputs)
    this._initSources(numSources)
    this._generateGlslTransforms()

    window.screencap = () => {
      this.saveFrame = true
    }

    if (enableStreamCapture) {
      this.captureStream = this.canvas.captureStream(25)

      // to do: enable capture stream of specific sources and outputs
      window.vidRecorder = new VidRecorder(this.captureStream)
    }

    if(detectAudio) this._initAudio()
    //if(makeGlobal) {
      window.mouse = mouse
      window.time = this.time
      window['render'] = this.render.bind(this)
    //  window.bpm = this.bpm
      window.bpm = this._setBpm.bind(this)
  //  }
    if(autoLoop) loop(this.tick.bind(this)).start()
  }

  getScreenImage(callback) {
    this.imageCallback = callback
    this.saveFrame = true
  }

  canvasToImage (callback) {
    const a = document.createElement('a')
    a.style.display = 'none'

    let d = new Date()
    a.download = `hydra-${d.getFullYear()}-${d.getMonth() + 1}-${d.getDate()}-${d.getHours()}.${d.getMinutes()}.${d.getSeconds()}.png`
    document.body.appendChild(a)
    var self = this
    this.canvas.toBlob( (blob) => {
      //  var url = window.URL.createObjectURL(blob)

        if(self.imageCallback){
          self.imageCallback(blob)
          delete self.imageCallback
        } else {
          a.href = URL.createObjectURL(blob)
          console.log(a.href)
          a.click()
        }
    }, 'image/png')
    setTimeout(() => {
      document.body.removeChild(a);
      window.URL.revokeObjectURL(a.href);
    }, 300);
  }

  _initAudio () {
    this.audio = new Audio({
      numBins: 4
    })
    if(this.makeGlobal) window.a = this.audio
  }
  // create main output canvas and add to screen
  _initCanvas (canvas) {
    if (canvas) {
      this.canvas = canvas
      this.width = canvas.width
      this.height = canvas.height
    } else {
      this.canvas = document.createElement('canvas')
      this.canvas.width = this.width
      this.canvas.height = this.height
      this.canvas.style.width = '100%'
      this.canvas.style.height = '100%'
      document.body.appendChild(this.canvas)
    }
  }

  _initRegl () {
    this.regl = require('regl')({
      canvas: this.canvas,
      pixelRatio: 1,
      extensions: [
        'oes_texture_half_float',
        'oes_texture_half_float_linear'
      ],
      optionalExtensions: [
        'oes_texture_float',
        'oes_texture_float_linear'
      ]})

    // This clears the color buffer to black and the depth buffer to 1
    this.regl.clear({
      color: [0, 0, 0, 1]
    })

    this.renderAll = this.regl({
      frag: `
      precision highp float;
      varying vec2 uv;
      uniform sampler2D tex0;
      uniform sampler2D tex1;
      uniform sampler2D tex2;
      uniform sampler2D tex3;

      void main () {
        vec2 st = vec2(1.0 - uv.x, uv.y);
        st*= vec2(2);
        vec2 q = floor(st).xy*(vec2(2.0, 1.0));
        int quad = int(q.x) + int(q.y);
        st.x += step(1., mod(st.y,2.0));
        st.y += step(1., mod(st.x,2.0));
        st = fract(st);
        if(quad==0){
          gl_FragColor = texture2D(tex0, st);
        } else if(quad==1){
          gl_FragColor = texture2D(tex1, st);
        } else if (quad==2){
          gl_FragColor = texture2D(tex2, st);
        } else {
          gl_FragColor = texture2D(tex3, st);
        }

      }
      `,
      vert: `
      precision highp float;
      attribute vec2 position;
      varying vec2 uv;

      void main () {
        uv = position;
        gl_Position = vec4(1.0 - 2.0 * position, 0, 1);
      }`,
      attributes: {
        position: [
          [-2, 0],
          [0, -2],
          [2, 2]
        ]
      },
      uniforms: {
        tex0: this.regl.prop('tex0'),
        tex1: this.regl.prop('tex1'),
        tex2: this.regl.prop('tex2'),
        tex3: this.regl.prop('tex3')
      },
      count: 3,
      depth: { enable: false }
    })

    this.renderFbo = this.regl({
      frag: `
      precision highp float;
      varying vec2 uv;
      uniform vec2 resolution;
      uniform sampler2D tex0;

      void main () {
        gl_FragColor = texture2D(tex0, vec2(1.0 - uv.x, uv.y));
      }
      `,
      vert: `
      precision highp float;
      attribute vec2 position;
      varying vec2 uv;

      void main () {
        uv = position;
        gl_Position = vec4(1.0 - 2.0 * position, 0, 1);
      }`,
      attributes: {
        position: [
          [-2, 0],
          [0, -2],
          [2, 2]
        ]
      },
      uniforms: {
        tex0: this.regl.prop('tex0'),
        resolution: this.regl.prop('resolution')
      },
      count: 3,
      depth: { enable: false }
    })
  }

  _initOutputs (numOutputs) {
    const self = this
    this.o = (Array(numOutputs)).fill().map((el, index) => {
      var o = new Output({regl: this.regl, width: this.width, height: this.height})
      o.render()
      o.id = index
      if (self.makeGlobal) window['o' + index] = o
      return o
    })

    // set default output
    this.output = this.o[0]
  }

  _initSources (numSources) {
    this.s = []
    for(var i = 0; i < numSources; i++) {
      this.createSource()
    }
  }

  _setBpm(bpm) {
    this.bpm = bpm
  }

  createSource () {
    let s = new Source({regl: this.regl, pb: this.pb, width: this.width, height: this.height})
    if(this.makeGlobal) {
      window['s' + this.s.length] = s
    }
    this.s.push(s)
    return s
  }

  _generateGlslTransforms () {
    const self = this
    const gen = new GeneratorFactory(this.o[0])
    window.generator = gen
    Object.keys(gen.functions).forEach((key)=>{
      self[key] = gen.functions[key]
      if(self.makeGlobal === true) {
        window[key] = gen.functions[key]
      }
    })
  }

  render (output) {
    if (output) {
      this.output = output
      this.isRenderingAll = false
    } else {
      this.isRenderingAll = true
    }
  }

  tick (dt, uniforms) {

  //  if(self.detectAudio === true) self.fft = self.audio.frequencies()
  // this.regl.frame(function () {
    this.time += dt * 0.001
    // console.log(this.time)
    // this.regl.clear({
    //   color: [0, 0, 0, 1]
    // })
    window.time = this.time
    if(this.detectAudio === true) this.audio.tick()
    for (let i = 0; i < this.s.length; i++) {
      this.s[i].tick(this.time)
    }

    for (let i = 0; i < this.o.length; i++) {
    //  console.log('WIDTH', this.canvas.width, this.o[0].getCurrent())
      this.o[i].tick({
        time: this.time,
        mouse: mouse,
        bpm: this.bpm,
        resolution: [this.canvas.width, this.canvas.height]
      })
    }

    // console.log("looping", self.o[0].fbo)
    if (this.isRenderingAll) {
      this.renderAll({
        tex0: this.o[0].getCurrent(),
        tex1: this.o[1].getCurrent(),
        tex2: this.o[2].getCurrent(),
        tex3: this.o[3].getCurrent(),
        resolution: [this.canvas.width, this.canvas.height]
      })
    } else {
    //  console.log('out', self.output.id)
      this.renderFbo({
        tex0: this.output.getCurrent(),
        resolution: [this.canvas.width, this.canvas.height]
      })
    }
    if(this.saveFrame === true) {
      this.canvasToImage()
      this.saveFrame = false
    }
  }


}

module.exports = HydraSynth