webvr js meetup initial commit

node_modules/three/examples/js/shaders/DigitalGlitch.js

@@ -0,0 +1,103 @@
+/**
+ * @author felixturner / http://airtight.cc/
+ *
+ * RGB Shift Shader
+ * Shifts red and blue channels from center in opposite directions
+ * Ported from http://kriss.cx/tom/2009/05/rgb-shift/
+ * by Tom Butterworth / http://kriss.cx/tom/
+ *
+ * amount: shift distance (1 is width of input)
+ * angle: shift angle in radians
+ */
+
+THREE.DigitalGlitch = {
+
+	uniforms: {
+
+		"tDiffuse":		{ value: null },//diffuse texture
+		"tDisp":		{ value: null },//displacement texture for digital glitch squares
+		"byp":			{ value: 0 },//apply the glitch ?
+		"amount":		{ value: 0.08 },
+		"angle":		{ value: 0.02 },
+		"seed":			{ value: 0.02 },
+		"seed_x":		{ value: 0.02 },//-1,1
+		"seed_y":		{ value: 0.02 },//-1,1
+		"distortion_x":	{ value: 0.5 },
+		"distortion_y":	{ value: 0.6 },
+		"col_s":		{ value: 0.05 }
+	},
+
+	vertexShader: [
+
+		"varying vec2 vUv;",
+		"void main() {",
+			"vUv = uv;",
+			"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
+		"}"
+	].join( "\n" ),
+
+	fragmentShader: [
+		"uniform int byp;",//should we apply the glitch ?
+		
+		"uniform sampler2D tDiffuse;",
+		"uniform sampler2D tDisp;",
+		
+		"uniform float amount;",
+		"uniform float angle;",
+		"uniform float seed;",
+		"uniform float seed_x;",
+		"uniform float seed_y;",
+		"uniform float distortion_x;",
+		"uniform float distortion_y;",
+		"uniform float col_s;",
+			
+		"varying vec2 vUv;",
+		
+		
+		"float rand(vec2 co){",
+			"return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);",
+		"}",
+				
+		"void main() {",
+			"if(byp<1) {",
+				"vec2 p = vUv;",
+				"float xs = floor(gl_FragCoord.x / 0.5);",
+				"float ys = floor(gl_FragCoord.y / 0.5);",
+				//based on staffantans glitch shader for unity https://github.com/staffantan/unityglitch
+				"vec4 normal = texture2D (tDisp, p*seed*seed);",
+				"if(p.y<distortion_x+col_s && p.y>distortion_x-col_s*seed) {",
+					"if(seed_x>0.){",
+						"p.y = 1. - (p.y + distortion_y);",
+					"}",
+					"else {",
+						"p.y = distortion_y;",
+					"}",
+				"}",
+				"if(p.x<distortion_y+col_s && p.x>distortion_y-col_s*seed) {",
+					"if(seed_y>0.){",
+						"p.x=distortion_x;",
+					"}",
+					"else {",
+						"p.x = 1. - (p.x + distortion_x);",
+					"}",
+				"}",
+				"p.x+=normal.x*seed_x*(seed/5.);",
+				"p.y+=normal.y*seed_y*(seed/5.);",
+				//base from RGB shift shader
+				"vec2 offset = amount * vec2( cos(angle), sin(angle));",
+				"vec4 cr = texture2D(tDiffuse, p + offset);",
+				"vec4 cga = texture2D(tDiffuse, p);",
+				"vec4 cb = texture2D(tDiffuse, p - offset);",
+				"gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);",
+				//add noise
+				"vec4 snow = 200.*amount*vec4(rand(vec2(xs * seed,ys * seed*50.))*0.2);",
+				"gl_FragColor = gl_FragColor+ snow;",
+			"}",
+			"else {",
+				"gl_FragColor=texture2D (tDiffuse, vUv);",
+			"}",
+		"}"
+
+	].join( "\n" )
+
+};