webvr js meetup initial commit

node_modules/three/examples/js/shaders/VignetteShader.js

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+/**
+ * @author alteredq / http://alteredqualia.com/
+ *
+ * Vignette shader
+ * based on PaintEffect postprocess from ro.me
+ * http://code.google.com/p/3-dreams-of-black/source/browse/deploy/js/effects/PaintEffect.js
+ */
+
+THREE.VignetteShader = {
+
+	uniforms: {
+
+		"tDiffuse": { value: null },
+		"offset":   { value: 1.0 },
+		"darkness": { value: 1.0 }
+
+	},
+
+	vertexShader: [
+
+		"varying vec2 vUv;",
+
+		"void main() {",
+
+			"vUv = uv;",
+			"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
+
+		"}"
+
+	].join( "\n" ),
+
+	fragmentShader: [
+
+		"uniform float offset;",
+		"uniform float darkness;",
+
+		"uniform sampler2D tDiffuse;",
+
+		"varying vec2 vUv;",
+
+		"void main() {",
+
+			// Eskil's vignette
+
+			"vec4 texel = texture2D( tDiffuse, vUv );",
+			"vec2 uv = ( vUv - vec2( 0.5 ) ) * vec2( offset );",
+			"gl_FragColor = vec4( mix( texel.rgb, vec3( 1.0 - darkness ), dot( uv, uv ) ), texel.a );",
+
+			/*
+			// alternative version from glfx.js
+			// this one makes more "dusty" look (as opposed to "burned")
+
+			"vec4 color = texture2D( tDiffuse, vUv );",
+			"float dist = distance( vUv, vec2( 0.5 ) );",
+			"color.rgb *= smoothstep( 0.8, offset * 0.799, dist *( darkness + offset ) );",
+			"gl_FragColor = color;",
+			*/
+
+		"}"
+
+	].join( "\n" )
+
+};