topical media & game development
mobile-query-three-vendor-three.js-shaders-BrightnessContrastShader.js / js
author: tapio / tapio.github.com/
Brightness and contrast adjustment
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)
THREE.BrightnessContrastShader = {
uniforms: {
"tDiffuse": { type: "t", value: null },
"brightness": { type: "f", value: 0 },
"contrast": { type: "f", 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")
};
(C) Æliens
04/09/2009
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