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mobile-query-three-vendor-three.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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