glitch post-processing shader broken in A-Frame 0.9.1

Description:
Using aframe-effects,
glitch post-processing shader working on A-Frame 0.9.0:

glitch post-processing shader broken on A-Frame 0.9.1:

• Platform / Device: Tested on OSX Chrome 73
• Reproducible Code Snippet or URL:

AFRAME.registerComponent("glitch", {
	    schema: { default: true },

	    init: function () {
	        this.system = this.el.sceneEl.systems.effects;

	        this.uniforms = {
	            "tDisp":		{ type: "t", value: this.generateHeightmap( 64 ) },
	            "amount":		{ type: "f", value: 0.08 },
	            "angle":		{ type: "f", value: 0.02 },
	            "seed":			{ type: "f", value: 0.02 },
	            "seed_x":		{ type: "f", value: 0.02 },//-1,1
	            "seed_y":		{ type: "f", value: 0.02 },//-1,1
	            "distortion_x":	{ type: "f", value: 0.5 },
	            "distortion_y":	{ type: "f", value: 0.6 },
	            "col_s":		{ type: "f", value: 0.05 }
		    };
	        
			this.exports = {
				glitch: {
	                fragment: this.fragment,
	                uniforms: this.uniforms
	            }
			}
	        // by declaring a .material property we set this component to take a whole pass of it's own
	        this.material = this.system.fuse([this.exports.glitch]);

	        this.system.register(this);
	    },

	    vr: true,

	    update: function () {
	        this.bypass = !this.data;
	        this.curF = 0;
	        this.generateTrigger();
	    },

	    remove: function () {
	        this.system.unregister(this);
	    },

	    tock: function () {
	        this.uniforms[ 'seed' ].value = Math.random();//default seeding
			
			if ( this.curF % this.randX == 0) {

				this.uniforms[ 'amount' ].value = Math.random() / 30;
				this.uniforms[ 'angle' ].value = THREE.Math.randFloat( - Math.PI, Math.PI );
				this.uniforms[ 'seed_x' ].value = THREE.Math.randFloat( - 1, 1 );
				this.uniforms[ 'seed_y' ].value = THREE.Math.randFloat( - 1, 1 );
				this.uniforms[ 'distortion_x' ].value = THREE.Math.randFloat( 0, 1 );
				this.uniforms[ 'distortion_y' ].value = THREE.Math.randFloat( 0, 1 );
				this.curF = 0;
				this.generateTrigger();

			} else if ( this.curF % this.randX < this.randX / 5 ) {

				this.uniforms[ 'amount' ].value = Math.random() / 90;
				this.uniforms[ 'angle' ].value = THREE.Math.randFloat( - Math.PI, Math.PI );
				this.uniforms[ 'distortion_x' ].value = THREE.Math.randFloat( 0, 1 );
				this.uniforms[ 'distortion_y' ].value = THREE.Math.randFloat( 0, 1 );
				this.uniforms[ 'seed_x' ].value = THREE.Math.randFloat( - 0.3, 0.3 );
				this.uniforms[ 'seed_y' ].value = THREE.Math.randFloat( - 0.3, 0.3 );

			} 

			this.curF ++;
	    },

	    generateTrigger: function() {

			this.randX = THREE.Math.randInt( 120, 240 );

		},

		generateHeightmap: function( dt_size ) {

			var data_arr = new Float32Array( dt_size * dt_size * 3 );
			var length = dt_size * dt_size;

			for ( var i = 0; i < length; i ++ ) {

				var val = THREE.Math.randFloat( 0, 1 );
				data_arr[ i * 3 + 0 ] = val;
				data_arr[ i * 3 + 1 ] = val;
				data_arr[ i * 3 + 2 ] = val;

			}

			var texture = new THREE.DataTexture( data_arr, dt_size, dt_size, THREE.RGBFormat, THREE.FloatType );
			texture.needsUpdate = true;
			return texture;

		},

	    fragment: [
			"float $rand(vec2 co){",
				"return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);",
			"}",
					
			"void $main(inout vec4 color, vec4 origColor, vec2 uv, float depth) {",
					"vec2 p = uv;",
	                "vec2 p2 = vec2( smoothstep(uvClamp.x, uvClamp.y, p.x),p.y);",
					"float xs = floor(gl_FragCoord.x / 0.5);",
					"float ys = floor(gl_FragCoord.y / 0.5);",
					//based on staffantans glitch shader for unity https://github.com/staffantan/unityglitch
					"vec4 normal = texture2D ($tDisp, p2 * $seed * $seed);",
					"if(p2.y < $distortion_x + $col_s && p2.y > $distortion_x - $col_s * $seed) {",
						"if($seed_x>0.){",
							"p.y = 1. - (p.y + $distortion_y);",
						"}",
						"else {",
							"p.y = $distortion_y;",
						"}",
					"}",
					"if(p2.x < $distortion_y + $col_s && p2.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($angle));",
					"vec4 cr = textureVR(tDiffuse, p + offset);",
					"vec4 cga = textureVR(tDiffuse, p);",
					"vec4 cb = textureVR(tDiffuse, p - offset);",
					"color = vec4(cr.r, cga.g, cb.b, cga.a);",
					//add noise
					"vec4 snow = 200.*$amount*vec4($rand(vec2(xs * $seed,ys * $seed*50.))*0.2);",
					"color = color+ snow;",
			"}"
		].join( "\n" )
	});

Here is the effects system:

	AFRAME.registerSystem("effects", {
	    schema: { type: "array", default: [] },

	    init: function () {
	        this.effects = {};
	        this.passes = [];
	        this._passes = [];
	        this.cameras = [];
	        this.setupPostState();
	        this.needsOverride = true;
	        this.lightComponents = [];
			this.LightState = {
				rows: 0,
				cols: 0,
				width: 0,
				height: 0,
				tileData: { value: null },
				tileTexture: { value: null },
				lightTexture: {
					value: new THREE.DataTexture( new Float32Array( 32 * 2 * 4 ), 32, 2, THREE.RGBAFormat, THREE.FloatType )
				},
			};
	    },

	    update: function () {
	        this.needsUpdate = true;
	    },
	    
	    addLight: function (behavior) {
			this.lightComponents.push(behavior);
		},
		
		removeLight: function (behavior) {
			var index = this.lightComponents.indexOf(behavior);
			this.lightComponents.splice(index);
	    },
	    
	    setupPostState: function () {
	        this.renderTarget = new THREE.WebGLRenderTarget(1, 1, { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter, format: THREE.RGBAFormat });
	        this.renderTarget.texture.generateMipmaps = false;
	        this.renderTarget.depthBuffer = true;
	        this.renderTarget.depthTexture = new THREE.DepthTexture();
	        this.renderTarget.depthTexture.type = THREE.UnsignedShortType;
	        this.renderTarget.depthTexture.minFilter = THREE.LinearFilter;
	        this.renderTarget.stencilBuffer = false;
	        this.scene = new THREE.Scene();
	        this.camera = new THREE.OrthographicCamera(-1, 1, 1, -1, 0, 1);
	        this.quad = new THREE.Mesh(new THREE.PlaneBufferGeometry(2, 2), null);
	        this.quad.frustumCulled = false;
	        this.scene.add(this.quad);
	        this.sceneLeft = new THREE.Scene();
	        this.quadLeft = new THREE.Mesh(new THREE.PlaneBufferGeometry(2, 2), null);
	        this.quadLeft.geometry.attributes.uv.array.set([0, 1, 0.5, 1, 0, 0, 0.5, 0]);
	        this.quadLeft.frustumCulled = false;
	        this.sceneLeft.add(this.quadLeft);
	        this.sceneRight = new THREE.Scene();
	        this.quadRight = new THREE.Mesh(new THREE.PlaneBufferGeometry(2, 2), null);
	        this.quadRight.geometry.attributes.uv.array.set([0.5, 1, 1, 1, 0.5, 0, 1, 0]);
	        this.quadRight.frustumCulled = false;
	        this.sceneRight.add(this.quadRight);
	        this.targets = [
	            new THREE.WebGLRenderTarget(1, 1, { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter, format: THREE.RGBAFormat }),
	            new THREE.WebGLRenderTarget(1, 1, { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter, format: THREE.RGBAFormat })
	        ];
	        
	        this.tDiffuse = {type: "t", value: null};
	        this.tDepth = {type: "t", value: this.renderTarget.depthTexture};
	        this.cameraFar = {type: "f", value: 0};
	        this.cameraNear = {type: "f", value: 0};
	        this.time = { type: "f", value: 0 };
	        this.timeDelta = { type: "f", value: 0 };
	        this.uvClamp = { type: "v2", value: this.uvBoth };
	        this.resolution = { type: "v4", value: new THREE.Vector4() };

	    },

	    vertexShader: [
	        '#include <common>',
	        'varying vec2 vUv;',
	        'void main() {',
	        '   vUv = uv;',
	        '   gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
	        '}'
	    ].join('\n'),

	    uvLeft: new THREE.Vector2(0, 0.5),
	    uvRight: new THREE.Vector2(0.5, 1),
	    uvBoth: new THREE.Vector2(0, 1),

	    parseToken: /([#a-z0-9\-\_]+)\.{0,1}([#a-z0-9\-\_]*)\s*\({0,1}\s*([\$a-z0-9\-\_\.\s]*)\){0,1}([\!\?]{0,1})/i,

	    renderPass: function (material, renderTarget, viewCb, forceClear){
	        var renderer = this.sceneEl.renderer;
	        this.quad.material = material;
	        var isFn = typeof viewCb === "function";
	        var s = renderTarget || renderer.getSize();
	        this.resolution.value.set(s.width, s.height, 1/s.width, 1/s.height);
	        var oldClear = renderer.autoClear;
	        renderer.autoClear = false;
	        if (viewCb) {
	            if (this.cameras.length > 1){
	                this.quadLeft.material = material;
	                this.uvClamp.value = this.uvLeft;
	                setView(0, 0, Math.round(s.width * 0.5), s.height);
	                if (isFn) viewCb(material, this.cameras[0], -1);
				    renderer.render(this.sceneLeft, this.camera, renderTarget, oldClear || forceClear);        
	                
	                this.quadRight.material = material;
	                this.uvClamp.value = this.uvRight;
	                setView(Math.round(s.width * 0.5), 0, Math.round(s.width * 0.5), s.height);
	                if (isFn) viewCb(material, this.cameras[1], 1);
	                renderer.render( this.sceneRight, this.camera, renderTarget);

	                this.uvClamp.value = this.uvBoth;
	                setView(0, 0, s.width, s.height);
	            } else {
	                setView(0, 0, s.width, s.height);
	                if (isFn) viewCb(material, this.sceneEl.camera, 0);
	                renderer.render( this.scene, this.camera, renderTarget, oldClear || forceClear);
	            }
	        } else {
	            setView(0, 0, s.width, s.height);
	            renderer.render(this.scene, this.camera, renderTarget, oldClear || forceClear);
	        }
	        renderer.autoClear = oldClear;
	        function setView(x,y,w,h) {
	            if (renderTarget) {
	                renderTarget.viewport.set( x, y, w, h );
					renderTarget.scissor.set( x, y, w, h );
	            } else {
	                renderer.setViewport( x, y, w, h );
					renderer.setScissor( x, y, w, h );
	            }
	        }
	    },

	    materialize: function (m) {
	        var fs = [
	            "uniform vec2 uvClamp;",
	            "vec4 textureVR( sampler2D sampler, vec2 uv ) {",
	            " return texture2D(sampler, vec2(clamp(uv.x, uvClamp.x, uvClamp.y), uv.y));",
	            "} ",
	            m.fragmentShader            
	        ].join("\n");
	        
	        m.uniforms.uvClamp = this.uvClamp;
	        
	        return new THREE.ShaderMaterial({
	            uniforms: m.uniforms,
	            vertexShader: m.vertexShader || this.vertexShader,
	            fragmentShader: fs,
	            depthWrite: false,
	            depthTest: false,
	            blending: THREE.NoBlending,
	            fog: false,
	            extensions: {
	                derivatives: true
	            },
	            defines: m.defines || {}
	        });
	    },

	    fuse: function (temp, alpha) {
	        if (!temp.length) return;
	        var self = this, count=0;
	        var chunks = [], head = [], main = [], includes = {}, 
	            needsDepth = false, needsDiffuse = false, k;
	 
	        var uniforms = {
	            time: this.time,
	            timeDelta: this.timeDelta,
	            resolution: this.resolution
	        };

	        temp.forEach(function (obj) {
	            var callMain = true, swapMain = false, args=[];
	            if (typeof obj === "string") {
	                var tok = self.parseToken.exec(obj);
	                if(!tok) return;
	                
	                callMain = tok[4] !== "!";
	                swapMain = tok[4] === "?";
	                obj = tok[1];
	                var prop = tok[2];
	                var temp = {};
	                
	                if(obj[0] === "#") {
	                    var el = document.querySelector(obj);
	                    if(!el) return;
	                    
	                    obj = {
	                        attrName: [obj.replace("#", "script_"), "_", (count++), "_"].join(""),
	                        fragment: prop ? 
	                            (el[prop] instanceof Document ? el[prop].body.textContent : el[prop]) 
	                            : el.textContent,
	                        depth: el.dataset.depth !== undefined,
	                        diffuse: el.dataset.diffuse !== undefined,
	                        includes: el.dataset.includes ? el.dataset.includes.trim().split(" ") : null,
	                        defaults: el.dataset.defaults ? el.dataset.defaults.trim().split(" ") : null
	                    };
	                } else {
	                    obj = self.effects[obj];
	                    if (!obj) return;
	                    if (prop) {
	                        obj = obj.exports ? obj.exports[prop] : null;
	                        if (!obj) return;
	                        obj.attrName = tok[1] + "_" + prop + "_";
	                    }
	                }
	                if (tok[3]) {
	                    args = tok[3].trim().split(" ");
	                }
	            }
	            var prefix = (obj.attrName ? obj.attrName : "undefined_" + (count++)) + "_";
	            prefix = prefix.replace("__","_");
	            if (obj.defaults) {
	                obj.defaults.forEach(function (d, i) {
	                    var v = args[i];
	                    chunks.push(["#define $", i, " ", v  && v !== "$" ? v : d ].join("").replace(/\$/g, prefix).replace("__","_"));
	                });
	            }
	            if (obj.diffuse) { needsDiffuse = true; }
	            if (obj.depth) { needsDepth = true; }
	            if (obj.fragment) { chunks.push(obj.fragment.replace(/\$/g, prefix)); }
	            if (obj.uniforms) {
	                for (var u in obj.uniforms) {
	                    uniforms[prefix + u] = obj.uniforms[u];
	                }
	            };
	            if (obj.includes) {
	                obj.includes.forEach(function (inc) {
	                    includes[inc] = true;
	                });
	            }
	            if (callMain) {
	                main.push(["  ", prefix, "main(", ( swapMain ? "origColor, color": "color, origColor"), ", vUv, depth);"].join(""));
	            }
	        });
	        var t2u = { "i": "int", "f": "float", "t": "sampler2D",
	            "v2": "vec2", "v3": "vec3", "c": "vec3","v4": "vec4", 
	            "m2": "mat2", "m3":"mat3", "m4": "mat4", "b": "bool" };

	        for(k in includes) { head.push("#include <" + k + ">"); }
	        
	        var premain = [
	            "void main () {" 
	        ];
	        uniforms["tDiffuse"] = this.tDiffuse;
	             
	        if (needsDiffuse){
	             premain.push("  vec4 color = texture2D(tDiffuse, vUv);"); 
	        } else {
	             premain.push("  vec4 color = vec4(0.0);"); 
	        }
	        premain.push("  vec4 origColor = color;"); 
	        
	        uniforms["tDepth"] = this.tDepth;
	        uniforms["cameraFar"] = this.cameraFar;
	        uniforms["cameraNear"] = this.cameraNear;
	            
	        if (needsDepth){
	            premain.push("  float depth = texture2D(tDepth, vUv).x;");
	        } else {
	            premain.push("  float depth = 0.0;");
	        }
	        
	        for(k in uniforms) {
	            var u = uniforms[k];
	            head.push(["uniform", t2u[u.type], k, ";"].join(" "));
	        }
	        
	        head.push("varying vec2 vUv;");
	        var source = [
	            head.join("\n"), chunks.join("\n"), "\n",
	                premain.join("\n"), main.join("\n"), 
	                alpha ? "  gl_FragColor = color;" : "  gl_FragColor = vec4(color.rgb, 1.0);", "}"
	        ].join("\n");

	        var material = this.materialize({
	            fragmentShader: source, 
	            uniforms: uniforms
	        });

	        if(this.sceneEl.components.debug) console.log(source, material);
	        return material;
	    },

	    rebuild: function () {
	        var self = this, passes = [], temp = [];
	        this.passes.forEach(function(pass){
	            if (pass.dispose) pass.dispose();
	        });
	        this.data.forEach(function (k) {
	            if(!k){
	                pickup();
	                return;
	            }
	            var obj, name;
	            var tok = self.parseToken.exec(k);
	            if(!tok || !tok[1]) return;
	            name = tok[1];
	            obj = self.effects[name];
	            if (!obj){
	                temp.push(k);
	                return;
	            }
	            if (obj.pass) {
	                pickup();
	                passes.push({ pass: obj.pass, behavior: obj } );
	            } else if (obj.material){
	                pickup();
	                passes.push({ pass: makepass(obj.material, false, obj.vr), behavior: obj });
	            } else {
	                temp.push(k);
	            }          
	        });

	        function pickup () {
	            if (!temp.length) return;
	            passes.push({ pass: makepass(self.fuse(temp), true)});
	            temp = [];
	        }

	        function makepass (material, dispose, viewCb) {
	            return {
	                render: function(renderer, writeBuffer, readBuffer){
	                    self.renderPass(material, writeBuffer, viewCb);
	                },

	                dispose: function () {
	                    if (dispose) material.dispose();
	                }
	            }
	        }
	        pickup();
	        this.needsUpdate = false;
	        this.passes = passes;
	    },

	    isActive: function (behavior, resize) {
	        var scene = this.sceneEl;
	        if (behavior.bypass) return false;
	        var isEnabled = scene.renderTarget ? true : false;
	        if (!isEnabled) return false;
	        if (resize && (this.needsResize || behavior.needsResize) && behavior.setSize) {
	            var size = scene.renderer.getSize();
	            behavior.setSize(size.width, size.height);
	            delete behavior.needsResize;
	        }
	        return true;
	    },

	    register: function (behavior) {
	        this.effects[behavior.attrName] = behavior;
	        this.needsUpdate = true;
	    },

	    unregister: function (behavior) {
	        delete this.effects[behavior.attrName];
	        this.needsUpdate = true;
	    },

	    tick: function (time, timeDelta) {
	        var self = this, sceneEl = this.sceneEl, renderer = sceneEl.renderer, effect = sceneEl.effect, 
	            rt = this.renderTarget, rts = this.targets, scene = sceneEl.object3D;
	        if(!rt || !renderer) { return; }
	        if (this.needsOverride) {
	            if(scene.onBeforeRender) {
	                scene.onBeforeRender = function (renderer, scene, camera) {
	                    var size = renderer.getSize();
	                    if (size.width !== rt.width || size.height !== rt.height) {
	                        rt.setSize(size.width, size.height);
	                        rts[0].setSize(size.width, size.height);
	                        rts[1].setSize(size.width, size.height);
	                        self.resolution.value.set(size.width, size.height, 1/size.width, 1/size.height);
	                        self.needsResize = true;
	                        self.resizeTiles();
	                    }
	                    if(camera instanceof THREE.ArrayCamera) {
	                        self.cameras = camera.cameras;
	                    } else {
	                        self.cameras.push(camera);
	                    }
	                    self.tileLights(renderer, scene, camera);
	                }
	            } else {
	                var rendererRender = renderer.render;
	                renderer.render = function (scene, camera, renderTarget, forceClear) {
	                    if (renderTarget === rt) {
	                        var size = renderer.getSize();
	                        if (size.width !== rt.width || size.height !== rt.height) {
	                            rt.setSize(size.width, size.height);
	                            rts[0].setSize(size.width, size.height);
	                            rts[1].setSize(size.width, size.height);
	                            self.resolution.value.set(size.width, size.height, 1/size.width, 1/size.height);
	                            self.needsResize = true;
	                        }
	                        self.cameras.push(camera);
	                    }
	                    rendererRender.call(renderer, scene, camera, renderTarget, forceClear);
	                }
	            }        
	            this.needsOverride = false;
	        }
	        this.cameras = [];
	        this.time.value = time / 1000;
	        this.timeDelta.value = timeDelta / 1000;

	        if (this.needsUpdate === true) { this.rebuild(); }

	       this.setupPasses();

	        this.tDiffuse.value = this.renderTarget.texture;
	        this.tDepth.value = this.renderTarget.depthTexture;
	        var camera = this.sceneEl.camera;
	        this.cameraFar.value = camera.far;
	        this.cameraNear.value = camera.near;                
	    },

	    setupPasses : function () {
	        var arr = [], rt = this.renderTarget;
	        this.passes.forEach(function (p) {
	            if (p.behavior && p.behavior.bypass === true) return;
	            arr.push(p);
	        });
	        this.sceneEl.renderTarget = arr.length && this.sceneEl.isPlaying ? rt : null;
	        this._passes = arr;
	    },
	    tock: function () {
	        var scene = this.sceneEl, renderer = scene.renderer, self = this;
	        if(!scene.renderTarget) { return; }
	        var rt = scene.renderTarget, rts = this.targets;
	        this._passes.forEach(function (pass, i) {
	            var r = i ? rts[i & 1] : rt;
	            self.tDiffuse.value = r.texture;   
	            if (pass.behavior && pass.behavior.resize) self.isActive(pass.behavior, true);
	            pass.pass.render(renderer, i < self._passes.length - 1 ? rts[(i+1) & 1] : null, r);
	        });
	        this.needsResize = false;
	    },

	    resizeTiles: function () {
	        var LightState = this.LightState;
	        var width = LightState.width;
	        var height = LightState.height;
	        LightState.cols = Math.ceil( width / 32 );
	        LightState.rows = Math.ceil( LightState.height / 32 );
	        LightState.tileData.value = [ width, height, 0.5 / Math.ceil( width / 32 ), 0.5 / Math.ceil( height / 32 ) ];
	        LightState.tileTexture.value = new THREE.DataTexture( new Uint8Array( LightState.cols * LightState.rows * 4 ), LightState.cols, LightState.rows );
	    },
	    
	    tileLights: function ( renderer, scene, camera ) {
	        if ( ! camera.projectionMatrix ) return;
	        var LightState = this.LightState, lights = this.lightComponents;
	        var size = renderer.getSize();
	        var d = LightState.tileTexture.value.image.data;
	        var ld = LightState.lightTexture.value.image.data;
	        var viewMatrix = camera.matrixWorldInverse;
	        d.fill( 0 );
	        var vector = new THREE.Vector3();

	        var passes;
	        if(camera instanceof THREE.ArrayCamera) {
	            passes = [ [0.5, 0, camera.cameras[0]], [0.5, 0.5, camera.cameras[1]]];
	        } else {
	            passes = [1.0, 0, camera];
	        }
	        passes.forEach(function(pass){
	            lights.forEach( function ( light, index ) {
	                vector.setFromMatrixPosition( light.el.object3D.matrixWorld );
	                var pw = LightState.width * pass[0];
	                var pm = LightState.width * pass[1];
	                var bs = self.lightBounds( pass[2], vector, light.data.radius, pw );
	                vector.applyMatrix4( viewMatrix );
	                vector.toArray( ld, 4 * index );
	                ld[ 4 * index + 3 ] = light.data.radius;
	                light.data.color.toArray( ld, 32 * 4 + 4 * index );
	                ld[ 32 * 4 + 4 * index + 3 ] = light.data.decay;
	                if ( bs[ 1 ] < 0 || bs[ 0 ] > pw || bs[ 3 ] < 0 || bs[ 2 ] > LightState.height ) return;
	                if ( bs[ 0 ] < 0 ) bs[ 0 ] = 0;
	                if ( bs[ 1 ] > pw ) bs[ 1 ] = pw;
	                if ( bs[ 2 ] < 0 ) bs[ 2 ] = 0;
	                if ( bs[ 3 ] > LightState.height ) bs[ 3 ] = LightState.height;
	                var i4 = Math.floor( index / 8 ), i8 = 7 - ( index % 8 );
	                for ( var i = Math.floor( bs[ 2 ] / 32 ); i <= Math.ceil( bs[ 3 ] / 32 ); i ++ ) {
	                    for ( var j = Math.floor( (bs[ 0 ] + pm) / 32  ); j <= Math.ceil( (bs[ 1 ] + pm) / 32 ); j ++ ) {
	                        d[ ( LightState.cols * i + j ) * 4 + i4 ] |= 1 << i8;
	                    }
	                }
	            } );
	        });
	        LightState.tileTexture.value.needsUpdate = true;
	        LightState.lightTexture.value.needsUpdate = true;
	    },
	    
	    lightBounds: function () {  
	        let v = new THREE.Vector3();
	        return function ( camera, pos, r, w ) {
	            var LightState = this.LightState;
	            var minX = w, maxX = 0, minY = LightState.height, maxY = 0, hw = w / 2, hh = LightState.height / 2;
	            for ( var i = 0; i < 8; i ++ ) {
	                v.copy( pos );
	                v.x += i & 1 ? r : - r;
	                v.y += i & 2 ? r : - r;
	                v.z += i & 4 ? r : - r;
	                var vector = v.project( camera );
	                var x = ( vector.x * hw ) + hw;
	                var y = ( vector.y * hh ) + hh;
	                minX = Math.min( minX, x );
	                maxX = Math.max( maxX, x );
	                minY = Math.min( minY, y );
	                maxY = Math.max( maxY, y );
	            }
	            return [ minX, maxX, minY, maxY ];
	    };
	    }()
	});

Start with the supplied glitch component and the effects system, especially materialize and renderPass, then compare the generated shader and rendering behavior between A-Frame 0.9.0 and 0.9.1 using the provided Chrome reproduction. Done means the glitch post-processing shader produces the expected effect on A-Frame 0.9.1 without breaking the supplied example.