Hex colors to Godot Vec4 Uniforms

hexToGodotVec4ShaderUniform.js

// Uses Apollo Color Pallete By Default: https://lospec.com/palette-list/apollo
var hexColors = [
  '#172038',
  '#253a5e',
  '#3c5e8b',
  '#4f8fba',
  '#73bed3',
  '#a4dddb',
  '#19332d',
  '#25562e',
  '#468232',
  '#75a743',
  '#a8ca58',
  '#d0da91',
  '#4d2b32',
  '#7a4841',
  '#ad7757',
  '#c09473',
  '#d7b594',
  '#e7d5b3',
  '#341c27',
  '#602c2c',
  '#884b2b',
  '#be772b',
  '#de9e41',
  '#e8c170',
  '#241527',
  '#411d31',
  '#752438',
  '#a53030',
  '#cf573c',
  '#da863e',
  '#1e1d39',
  '#402751',
  '#7a367b',
  '#a23e8c',
  '#c65197',
  '#df84a5',
  '#090a14',
  '#10141f',
  '#151d28',
  '#202e37',
  '#394a50',
  '#577277',
  '#819796',
  '#a8b5b2',
  '#c7cfcc',
  '#ebede9',
];

function hexToGodotVec4ShaderUniform(hexColor, alpha, index) {
  var red_channel = hexChannelToFloat(hexColor, 'red');
  var green_channel = hexChannelToFloat(hexColor, 'green');
  var blue_channel = hexChannelToFloat(hexColor, 'blue');

  return `uniform vec4 color_${(index + 1)} = vec4(${red_channel}, ${green_channel}, ${blue_channel}, ${(alpha || 1.0).toFixed(1)});`;
}

function hexChannelToFloat(hexColor, channel) {
  var hexSliceDigits;
  if (channel === 'red') hexSliceDigits = [1, 3];
  if (channel === 'green') hexSliceDigits = [3, 5];
  if (channel === 'blue') hexSliceDigits = [5, 7];

  return parseInt(hexColor.slice(hexSliceDigits[0], hexSliceDigits[1]), 16) / 256;
};

var shaderColors = hexColors.map(function(hexColor, index) {
  return hexToGodotVec4ShaderUniform(hexColor, 1.0, index)
});

console.log(shaderColors.join('\n'));