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import { dot, Fn, vec3, vec4 } from 'three/tsl';
/** @module Sepia **/
/**
* Applies a sepia effect to the given color node.
*
* @function
* @param {Node<vec4>} color - The color node to apply the sepia for.
* @return {Node<vec4>} The updated color node.
*/
export const sepia = /*@__PURE__*/ Fn( ( [ color ] ) => {
const c = vec3( color );
// https://github.com/evanw/glfx.js/blob/master/src/filters/adjust/sepia.js
return vec4(
dot( c, vec3( 0.393, 0.769, 0.189 ) ),
dot( c, vec3( 0.349, 0.686, 0.168 ) ),
dot( c, vec3( 0.272, 0.534, 0.131 ) ),
color.a
);
} );
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