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HTML

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <canvas id="canvas"></canvas>
!

CSS 

              
                html, body{
  height: 100%;
}

body{
  overflow: hidden;
  cursor: pointer;
  background-color: black;
}

.logo{
  color: white;
  font-size: 2em;
  font-weight: 400;
  font-family: "Montserrat", cursive;
  text-align: center;
}

canvas{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: 1000;
}
!

JS 

              
                const vert = `
  precision mediump float;

  attribute vec3 position;
  attribute vec2 texcoord;

  uniform mat4 uMatrix;
  uniform mat4 uTmatrix;

  uniform float uTime;
  uniform vec2 uRes;
  uniform vec2 uOffset;
  uniform float uPower;

  varying vec2 vTexcoord;

  void main() {
    vec3 pos = position.xzy;

    float dist = distance(uOffset, vec2(pos.x, pos.y));
    float rippleEffect = cos(15.0 * (dist - (uTime / 60.0)));
    float distortionEffect = rippleEffect * uPower;

    pos.x += (distortionEffect / 30.0 * (uOffset.x - pos.x));
    pos.y += distortionEffect / 30.0 * (uOffset.y - pos.y);

    gl_Position = uMatrix * vec4(pos, 1.0);
    vTexcoord = (uTmatrix * vec4(texcoord - vec2(.5), 0, 1)).xy + vec2(.5);
  }  
`

const frag = `
  precision mediump float;

  uniform sampler2D uTexOne;
  uniform sampler2D uTexTwo;
  uniform float uProgress;

  varying vec2 vTexcoord;

  void main() {
    vec2 uv = vTexcoord;
  
    vec4 color = vec4(1.0);

    vec4 texOne = texture2D(uTexOne, uv);
    vec4 texTwo = texture2D(uTexTwo, uv);

    float effect = step(uv.x, uProgress);
    color = mix(texOne, texTwo, effect);

    gl_FragColor = color;
  }
`

function main() {
  const canvas = document.querySelector('#canvas')
  const gl = canvas.getContext('webgl')
  
  const m4 = twgl.m4
  
  const programInfo = twgl.createProgramInfo(gl, [vert, frag])
  const bufferInfo = twgl.primitives.createPlaneBufferInfo(gl, 1, 1, 30, 30)
  
  const images = [
    'https://images.unsplash.com/photo-1492571350019-22de08371fd3?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxzZWFyY2h8NXx8amFwYW58ZW58MHx8MHx8&auto=format&fit=crop&w=600&q=60',
    'https://images.unsplash.com/photo-1512531123205-560f5974e686?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxzZWFyY2h8MTl8fGNpdHl8ZW58MHx8MHx8&auto=format&fit=crop&w=600&q=60',
    'https://images.unsplash.com/photo-1655192972438-71a670198bfd?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwcm9maWxlLXBhZ2V8Mnx8fGVufDB8fHx8&auto=format&fit=crop&w=600&q=60',
    'https://images.unsplash.com/photo-1654431729108-8fe8a1bbbae6?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwcm9maWxlLXBhZ2V8MjF8fHxlbnwwfHx8fA%3D%3D&auto=format&fit=crop&w=600&q=60'
  ]
  
  const textures = []
  
  let values = {
    total: images.length - 1,
    power: 0,
    progress: 0,
    time: 0,
    offset: [0, 0],
    current: 0,
    next: 1
  }
  
  let isAnimating = false
  
  function createTextures() {
    images.forEach(src => {
      const info = {
        texture: null,
        width: 1,
        heigth: 1        
      }
      
      info.texture = createTexture(info, src)
      
      textures.push(info)
    })
  }
  
  function createTexture(info, src) {
    let texture = gl.createTexture()
    gl.bindTexture(gl.TEXTURE_2D, texture)

    const level = 0
    const internalFormat = gl.RGB
    const width = 1
    const height = 1
    const border = 0
    const srcFormat = gl.RGB
    const srcType = gl.UNSIGNED_BYTE
    const pixel = new Uint8Array([0, 0, 0, 0])

    gl.texImage2D(
      gl.TEXTURE_2D, 
      level, 
      internalFormat, 
      width, 
      height, 
      border, 
      srcFormat, 
      srcType, 
      pixel
    )

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)

    const image = document.createElement('img')

    image.addEventListener('load', () => {
      gl.bindTexture(gl.TEXTURE_2D, texture)
      gl.texImage2D(
        gl.TEXTURE_2D, 
        level, 
        internalFormat, 
        srcFormat, 
        srcType, 
        image
      )

      info.width = image.width
      info.height = image.height
    })

    image.crossOrigin = ''
    image.src = src
    
    return texture
  }
  
  function render() {
    twgl.resizeCanvasToDisplaySize(gl.canvas)

    gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight)
    gl.clearColor(0, 0, 0, 0)
    gl.clear(gl.COLOR_BUFFER_BIT)

    let matrix = m4.identity()
    let tMatrix = m4.identity()
    
    const texAspect = textures[0].width / textures[0].height
    const imgAspect = gl.canvas.width / gl.canvas.height

    let scaleY = 0
    let scaleX = 0
    
    if (imgAspect < texAspect) {
      scaleY = 1
      scaleX = imgAspect / texAspect
    } else if (imgAspect > texAspect) {
      scaleY = texAspect / imgAspect
      scaleX = 1
    }
     
    m4.scale(tMatrix, [scaleX, scaleY, 1], tMatrix)

    values.time++
    
    m4.ortho(0, gl.canvas.width, gl.canvas.height, 0, -1, 1, matrix)
    m4.translate(matrix, [gl.canvas.width / 2, gl.canvas.height / 2, 1], matrix)
    m4.scale(matrix, [gl.canvas.width / 1.5, gl.canvas.height / 1.5, 1], matrix)

    gl.useProgram(programInfo.program)
    
    twgl.setBuffersAndAttributes(gl, programInfo, bufferInfo)
    
    twgl.setUniforms(programInfo, {
      uMatrix: matrix,
      uTmatrix: tMatrix,
      uTexOne: textures[values.current].texture,
      uTexTwo: textures[values.next].texture,
      uTime: values.time,
      uPower: values.power,
      uProgress: values.progress,
      uRes: [gl.canvas.width, gl.canvas.height],
      uOffset: values.offset
    })
    
    twgl.drawBufferInfo(gl, bufferInfo)
  }
  
  function listeners() {
    canvas.addEventListener('click', onClick)
  }
  
  function changeSlide() {
    values.current = values.next
    values.next = values.next === values.total ? 0 : values.next + 1
  }
  
  function onClick(e) {
    if (isAnimating) return
    isAnimating = true
    
    values.offset = [
      e.clientX / gl.canvas.width * 2 - 1,
      e.clientY / gl.canvas.height * 2 - 1
    ]
    
    const master = new TimelineMax({ 
        onComplete: () => {
          isAnimating = false
          values.progress = 0
          changeSlide()
        }
    })
    
    const sub = new TimelineLite({ paused: true })

    sub
    .to(values, 0.5, { power: 1, ease: Linear.easeNone }, 0)
    .to(values, 1, { power: 0, ease: Linear.easeNone })
    
    master
    .to(sub, 1.5, { progress: 1, ease: Power2.easeInOut })
    .to(values, 1.15, { progress: 1, ease: Expo.easeInOut }, 0) 
  }
  
  function init () {
    createTextures()
    listeners()

    TweenMax.ticker.addEventListener('tick', render)
  }
  
  init()
}

main()
!
999px

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