three-stdlib/shaders/SepiaShader.js

stand-alone library of threejs examples

const SepiaShader = {
  uniforms: {
    tDiffuse: { value: null },
    amount: { value: 1 }
  },
  vertexShader: [
    "varying vec2 vUv;",
    "void main() {",
    "	vUv = uv;",
    "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
    "}"
  ].join("\n"),
  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 );",
    "}"
  ].join("\n")
};
export {
  SepiaShader
};
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