Particle Waves WebGL Shader

index.html

<div class="waves"></div>

particle-waves-webgl-shader.markdown

Particle Waves WebGL Shader

Particle Waves made with native WebGL shader

A Pen by Boris Šehovac on CodePen.

License.

script.js

// https://github.com/bsehovac/shader-program

const pointSize = 2.5

const waves = new ShaderProgram( document.querySelector( '.waves' ), {
  texture: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAAb1BMVEUAAAD///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////8v0wLRAAAAJHRSTlMAC/goGvDhmwcExrVjWzrm29TRqqSKenRXVklANSIUE8mRkGpv+HOfAAABCElEQVQ4y4VT13LDMAwLrUHteO+R9f/fWMfO6dLaPeKVEECRxOULWsEGpS9nULDwia2Y+ALqUNbAWeg775zv+sA4/FFRMxt8U2FZFCVWjR/YrH4/H9sarclSKdPMWKzb8VsEeHB3m0shkhVCyNzeXeAQ9Xl4opEieX2QCGnwGbj6GMyjw9t1K0fK9YZunPXeAGsfJtYjwzxaBnozGGorYz0ypK2HzQSYx1y8DgSRo2ewOiyh2QWOEk1Y9OrQV0a8TiBM1a8eMHWYnRMy7CZ4t1CmyRkhSUvP3gRXyHOCLBxNoC3IJv//ZrJ/kxxUHPUB+6jJZZHrpg6GOjnqaOmzp4NDR48OLxn/H27SRQ08S0ZJAAAAAElFTkSuQmCC',
  uniforms: {
    size: { type: 'float', value: pointSize },
    field: { type: 'vec3', value: [ 0, 0, 0 ] },
    speed: { type: 'float', value: 5 },
  },
  vertex: `
    #define M_PI 3.1415926535897932384626433832795

    precision highp float;

    attribute vec4 a_position;
    attribute vec4 a_color;

    uniform float u_time;
    uniform float u_size;
    uniform float u_speed;
    uniform vec3 u_field;
    uniform mat4 u_projection;

    varying vec4 v_color;

    void main() {

      vec3 pos = a_position.xyz;

      pos.y += (
        cos(pos.x / u_field.x * M_PI * 8.0 + u_time * u_speed) +
        sin(pos.z / u_field.z * M_PI * 8.0 + u_time * u_speed)
      ) * u_field.y;

      gl_Position = u_projection * vec4( pos.xyz, a_position.w );
      gl_PointSize = ( u_size / gl_Position.w ) * 100.0;

      v_color = a_color;

    }`,
  fragment: `
    precision highp float;

    uniform sampler2D u_texture;

    varying vec4 v_color;

    void main() {

      gl_FragColor = v_color * texture2D(u_texture, gl_PointCoord);

    }`,
  onResize( w, h, dpi ) {

    const position = [], color = []

    const width = 400 * ( w / h )
    const depth = 400
    const height = 3
    const distance = 5

    for ( let x = 0; x < width; x += distance ) {
      for ( let z = 0; z < depth; z+= distance ) {

        position.push( - width / 2 + x, -30, -depth / 2 + z )
        color.push( 0, 1 - ( x / width ) * 1, 0.5 + x / width * 0.5, z / depth )

      }
    }

    this.uniforms.field = [ width, height, depth ]

    this.buffers.position = position
    this.buffers.color = color

    this.uniforms.size = ( h / 400) * pointSize * dpi

  },
} )

scripts

<script src="https://codepen.io/bsehovac/pen/mddZWPw.js"></script>

style.css

html, body { height: 100%; }
body { margin: 0; background: #000; }
canvas { display: block; }
.waves { position: absolute; left: 0; top: 0; right: 0; bottom: 0; }