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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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