topical media & game development
mobile-query-three-vendor-three-r53.js-shaders-BleachBypassShader.js / js
author: alteredq / alteredqualia.com/
Bleach bypass shader [http://en.wikipedia.org/wiki/Bleach_bypass]
- based on Nvidia example
http://developer.download.nvidia.com/shaderlibrary/webpages/shader_library.html#post_bleach_bypass
THREE.BleachBypassShader = {
uniforms: {
"tDiffuse": { type: "t", value: null },
"opacity": { type: "f", value: 1.0 }
},
vertexShader: [
"varying vec2 vUv;",
"void main() {",
"vUv = uv;",
"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
"}"
].join("\n"),
fragmentShader: [
"uniform float opacity;",
"uniform sampler2D tDiffuse;",
"varying vec2 vUv;",
"void main() {",
"vec4 base = texture2D( tDiffuse, vUv );",
"vec3 lumCoeff = vec3( 0.25, 0.65, 0.1 );",
"float lum = dot( lumCoeff, base.rgb );",
"vec3 blend = vec3( lum );",
"float L = min( 1.0, max( 0.0, 10.0 * ( lum - 0.45 ) ) );",
"vec3 result1 = 2.0 * base.rgb * blend;",
"vec3 result2 = 1.0 - 2.0 * ( 1.0 - blend ) * ( 1.0 - base.rgb );",
"vec3 newColor = mix( result1, result2, L );",
"float A2 = opacity * base.a;",
"vec3 mixRGB = A2 * newColor.rgb;",
"mixRGB += ( ( 1.0 - A2 ) * base.rgb );",
"gl_FragColor = vec4( mixRGB, base.a );",
"}"
].join("\n")
};
(C) Æliens
04/09/2009
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