webvr js meetup initial commit

node_modules/three/examples/js/shaders/BrightnessContrastShader.js

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+/**
+ * @author tapio / http://tapio.github.com/
+ *
+ * Brightness and contrast adjustment
+ * https://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":   { value: null },
+		"brightness": { value: 0 },
+		"contrast":   { 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" )
+
+};