simsite/frontend/node_modules/three-stdlib/shaders/SepiaShader.js

const SepiaShader = {
  uniforms: {
    tDiffuse: { value: null },
    amount: { value: 1 }
  },
  vertexShader: (
    /* glsl */
    `
    varying vec2 vUv;

    void main() {

    	vUv = uv;
    	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

    }
  `
  ),
  fragmentShader: (
    /* glsl */
    `
    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 );

    }
  `
  )
};
export {
  SepiaShader
};
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