color-to-vec4/es/lib/rgbToVec4.js

:white_square_button: a color (rgb, rgba, hex) to vec4 convertor

import mapChannel from './mapChannel';
import normalize from './normalize';

export default (function (color) {

  var alpha = false;

  if (color.startsWith('rgba(')) alpha = true;else if (color.startsWith('rgb(')) alpha = false;

  var split = alpha ? 'rgba(' : 'rgb(';

  var channels = color.split(split)[1].split(')')[0].split(',');
  if (channels.length < 3 || channels.length > 4) {
    throw new Error(color + ' is not a valid rgb(a) color');
  }

  channels = channels.map(function (c) {
    return parseFloat(c);
  }).map(function (c) {
    return normalize(0, 255, c);
  });

  var _channels = channels,
      r = _channels[0],
      g = _channels[1],
      b = _channels[2],
      _channels$ = _channels[3],
      a = _channels$ === undefined ? 1 : _channels$;

  var aa = normalize(0, 1, a);

  var rgb = [r, g, b].map(mapChannel);

  return [].concat(rgb, [aa]);
});