Pixelblaze Triple Helix Hourglass ⏳⌛️

pixelblaze-triple-helix-hourglass.js

// Pixelblaze Triple Helix Hourglass
// by Jason Coon, Evil Genius Labs: evilgeniuslabs.org
// This work is licensed under a Creative Commons (4.0 International License):
// Attribution—Noncommercial—Share Alike: https://creativecommons.org/licenses/by-nc-sa/4.0

var pixels = array(pixelCount)

export var maxLevel = 0.25
export var friction = 128

// export function sliderFriction(v) {
//   friction = clamp(v * 1024, 1, 1024)
// }

// export function showNumberFriction() {
//   return friction
// }

// export function sliderMaxLevel(v) {
//   maxLevel = v / 2
// }

// export function showNumberMaxLevel() {
//   return maxLevel
// }

export var topLevel = maxLevel / 2
export var bottomLevel = maxLevel / 2
export var vInc = 1.0 / friction
export var upsideDown
export var falling
export var accelerometer

export function beforeRender(delta) {
  t1 = time(0.01)
  
  var az = accelerometer[2]
  
  // if az > 0 right side up
  // if az < 0 upside down
  upsideDown = az < 0

  topLevel -= az / friction
  bottomLevel += az / friction

  topLevel = clamp(topLevel, 0, maxLevel)
  bottomLevel = clamp(bottomLevel, 0, maxLevel)
  
  falling = topLevel !== 0 && bottomLevel !== 0
  
  mapPixels((index, x, y, z) => {
    var v = pixels[index]
    
    if (falling) {
      if (upsideDown) { // upside down
        if (z >= 0.5 && z < (1 - topLevel)) {
          v = wave(t1 - z * 16) * 0.4
        }
      }
      else { // rightside up
        if (z <= 0.5 && z > bottomLevel) {
          v = wave(t1 + z * 16) * 0.4
        }
      }
    }
    
    if (upsideDown) {
      if(z > (1 - maxLevel) && z > (1 - topLevel)) {
        // "bottom" pile
        v += vInc
      }
      else if (z < 0.5 && z > 0.5 - bottomLevel) {
        // "top" pile, avove the mid level, waiting to fall
        v += vInc
      }
      else {
        v -= vInc
      }
    } else { // rightside up
      if (z < maxLevel && z < bottomLevel) {
        // "bottom" pile
        v += vInc
      }
      else if (z > 0.5 && z < 0.5 + topLevel) {
        // "top" pile, avove the mid level, waiting to fall
        v += vInc
      }
      else {
        v -= vInc
      }
    }
    
    v = clamp(v, 0, 1)
    
    pixels[index] = v
  })
}

export function render3D(index, x, y, z) {
  // middle indicator
  // if (z >= 0.5 && z <= 0.5) {
  //   return hsv(0, 1, 0.5)
  // }
  
  var v = pixels[index]
    
  return hsv(0.2, 0.25, v * v)
}