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/**
* @author tapio / http://tapio.github.com/
*
* Brightness and contrast adjustment
* https://github.com/evanw/glfx.js
* brightness: -1 to 1 (-1 is solid black, 0 is no change, and 1 is solid white)
* contrast: -1 to 1 (-1 is solid gray, 0 is no change, and 1 is maximum contrast)
*/
var BrightnessContrastShader = {
uniforms: {
"tDiffuse": { value: null },
"brightness": { value: 0 },
"contrast": { value: 0 }
},
vertexShader: [
"varying vec2 vUv;",
"void main() {",
" vUv = uv;",
" gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
"}"
].join( "\n" ),
fragmentShader: [
"uniform sampler2D tDiffuse;",
"uniform float brightness;",
"uniform float contrast;",
"varying vec2 vUv;",
"void main() {",
" gl_FragColor = texture2D( tDiffuse, vUv );",
" gl_FragColor.rgb += brightness;",
" if (contrast > 0.0) {",
" gl_FragColor.rgb = (gl_FragColor.rgb - 0.5) / (1.0 - contrast) + 0.5;",
" } else {",
" gl_FragColor.rgb = (gl_FragColor.rgb - 0.5) * (1.0 + contrast) + 0.5;",
" }",
"}"
].join( "\n" )
};
export { BrightnessContrastShader };
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