Added hue and saturation adjustment shader "extra".

Also fixed whitespace in the shader list.

examples/js/ShaderExtras.js

@@ -5,15 +5,15 @@
  *
  * ShaderExtras currently contains:
  *
- *	screen
- *	convolution
- *	film
- * 	bokeh
+ *  screen
+ *  convolution
+ *  film
+ *  bokeh
  *  sepia
- *	dotscreen
- *	vignette
+ *  dotscreen
+ *  vignette
  *  bleachbypass
- *	basic
+ *  basic
  *  dofmipmap
  *  focus
  *  triangleBlur
@@ -23,6 +23,7 @@
  *  fxaa
  *  luminosity
  *  colorCorrection
+ *  hueSaturation
  *  normalmap
  *  ssao
  *  colorify
@@ -1336,6 +1337,74 @@ THREE.ShaderExtras = {
 
 	},
 
+	/* -------------------------------------------------------------------------
+	//	Hue and saturation adjustment
+	//	https://github.com/evanw/glfx.js
+	//	hue: -1 to 1 (-1 is 180 degrees in the negative direction, 0 is no change, etc.
+	//	saturation: -1 to 1 (-1 is solid gray, 0 is no change, and 1 is maximum contrast)
+	 ------------------------------------------------------------------------- */
+
+	'hueSaturation': {
+
+		uniforms: {
+
+			"tDiffuse"   : { type: "t", value: null },
+			"hue"        : { type: "f", value: 0 },
+			"saturation" : { 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 hue;",
+			"uniform float saturation;",
+
+			"varying vec2 vUv;",
+
+			"void main() {",
+
+				"gl_FragColor = texture2D( tDiffuse, vUv );",
+
+				// hue
+				"float angle = hue * 3.14159265;",
+				"float s = sin(angle), c = cos(angle);",
+				"vec3 weights = (vec3(2.0 * c, -sqrt(3.0) * s - c, sqrt(3.0) * s - c) + 1.0) / 3.0;",
+				"float len = length(gl_FragColor.rgb);",
+				"gl_FragColor.rgb = vec3(",
+					"dot(gl_FragColor.rgb, weights.xyz),",
+					"dot(gl_FragColor.rgb, weights.zxy),",
+					"dot(gl_FragColor.rgb, weights.yzx)",
+				");",
+
+				// saturation
+				"float average = (gl_FragColor.r + gl_FragColor.g + gl_FragColor.b) / 3.0;",
+				"if (saturation > 0.0) {",
+					"gl_FragColor.rgb += (average - gl_FragColor.rgb) * (1.0 - 1.0 / (1.001 - saturation));",
+				"} else {",
+					"gl_FragColor.rgb += (average - gl_FragColor.rgb) * (-saturation);",
+				"}",
+
+			"}"
+
+		].join("\n")
+
+	},
+
 	/* -------------------------------------------------------------------------
 	//	Normal map shader
 	//	- compute normals from heightmap