webvr js meetup initial commit

node_modules/three/examples/js/shaders/HueSaturationShader.js

@@ -0,0 +1,69 @@
+/**
+ * @author tapio / http://tapio.github.com/
+ *
+ * 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)
+ */
+
+THREE.HueSaturationShader = {
+
+	uniforms: {
+
+		"tDiffuse":   { value: null },
+		"hue":        { value: 0 },
+		"saturation": { 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" )
+
+};