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/**
* @author alteredq / http://alteredqualia.com/
*
* Sepia tone shader
* based on glfx.js sepia shader
* https://github.com/evanw/glfx.js
*/
var 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 );",
"}"
].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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