import * as THREE from "three" ; /**
 * `SepiaShader`.
 */ export const SepiaShader = { uniforms : { tDiffuse : { value : null } , amount : { value : 1.0 } } , vertexShader : `
        varying vec2 vUv;
        void main() {
            vUv = uv;
            gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
        }` , fragmentShader : `
        uniform float amount;
        uniform sampler2D tDiffuse;
        varying vec2 vUv;
        void main() {
            vec4 color = texture2D( tDiffuse, vUv );
            vec3 c = color.rgb;
            color.r = dot( c, vec3( 1.0 - 0.607 * amount, 0.769 * amount, 0.189 * amount ) );
            color.g = dot( c, vec3( 0.349 * amount, 1.0 - 0.314 * amount, 0.168 * amount ) );
            color.b = dot( c, vec3( 0.272 * amount, 0.534 * amount, 1.0 - 0.869 * amount ) );
            gl_FragColor = vec4( min( vec3( 1.0 ), color.rgb ), color.a );
        }` } ;