Sophia

I'm attempting to write my first shader and could use a little help. It replicates a very simple modular patch I've been using for a while that simulates the flicker of a television screen on whatever is in front of it- the colors moving across the face of the viewer, etc. I'll attach both the patcher and shader versions, and hopefully someone can correct me on what I've done wrong.

            "box" :             {

                "maxclass" : "newobj",

                "text" : "jit.matrix 4 char 4 4",

                "id" : "obj-8",

                "numinlets" : 1,

                "fontname" : "Arial",

                "numoutlets" : 2,

                "outlettype" : [ "jit_matrix", "" ],

                "patching_rect" : [ 148.0, 100.0, 112.0, 20.0 ],

                "fontsize" : 12.0

                "text" : "jit.convolve",

                "id" : "obj-2",

                "numinlets" : 2,

                "patching_rect" : [ 106.0, 206.0, 70.0, 20.0 ],

                "text" : "jit.op @op +",

                "id" : "obj-11",

                "patching_rect" : [ 50.0, 281.0, 75.0, 20.0 ],

                "maxclass" : "inlet",

                "id" : "obj-10",

                "numinlets" : 0,

                "numoutlets" : 1,

                "outlettype" : [ "" ],

                "patching_rect" : [ 78.0, 40.0, 25.0, 25.0 ],

                "comment" : ""

                "id" : "obj-13",

                "patching_rect" : [ 153.0, 40.0, 25.0, 25.0 ],

                "maxclass" : "outlet",

                "id" : "obj-14",

                "numoutlets" : 0,

                "patching_rect" : [ 55.0, 361.0, 25.0, 25.0 ],

            "patchline" :             {

                "source" : [ "obj-11", 0 ],

                "destination" : [ "obj-14", 0 ],

                "hidden" : 0,

                "midpoints" : [ ]

                "source" : [ "obj-13", 0 ],

                "destination" : [ "obj-8", 0 ],

                "source" : [ "obj-10", 0 ],

                "destination" : [ "obj-2", 0 ],

                "destination" : [ "obj-11", 0 ],

                "source" : [ "obj-8", 0 ],

                "destination" : [ "obj-2", 1 ],

                "source" : [ "obj-2", 0 ],

                "destination" : [ "obj-11", 1 ],

    simulates the flickering of a television screen

I'm attempting to write my first shader and could use a little help.  It replicates a very simple modular patch I've been using for a while that simulates the flicker of a television screen on whatever is in front of it- the colors moving across the face of the viewer, etc.  I'll attach both the patcher and shader versions, and hopefully someone can correct me on what I've done wrong. 

{
	"boxes" : [ 		{
			"box" : 			{
				"maxclass" : "newobj",
				"text" : "jit.matrix 4 char 4 4",
				"id" : "obj-8",
				"numinlets" : 1,
				"fontname" : "Arial",
				"numoutlets" : 2,
				"outlettype" : [ "jit_matrix", "" ],
				"patching_rect" : [ 148.0, 100.0, 112.0, 20.0 ],
				"fontsize" : 12.0
			}

		}
, 		{
			"box" : 			{
				"maxclass" : "newobj",
				"text" : "jit.convolve",
				"id" : "obj-2",
				"numinlets" : 2,
				"fontname" : "Arial",
				"numoutlets" : 2,
				"outlettype" : [ "jit_matrix", "" ],
				"patching_rect" : [ 106.0, 206.0, 70.0, 20.0 ],
				"fontsize" : 12.0
			}

		}
, 		{
			"box" : 			{
				"maxclass" : "newobj",
				"text" : "jit.op @op +",
				"id" : "obj-11",
				"numinlets" : 2,
				"fontname" : "Arial",
				"numoutlets" : 2,
				"outlettype" : [ "jit_matrix", "" ],
				"patching_rect" : [ 50.0, 281.0, 75.0, 20.0 ],
				"fontsize" : 12.0
			}

		}
, 		{
			"box" : 			{
				"maxclass" : "inlet",
				"id" : "obj-10",
				"numinlets" : 0,
				"numoutlets" : 1,
				"outlettype" : [ "" ],
				"patching_rect" : [ 78.0, 40.0, 25.0, 25.0 ],
				"comment" : ""
			}

		}
, 		{
			"box" : 			{
				"maxclass" : "inlet",
				"id" : "obj-13",
				"numinlets" : 0,
				"numoutlets" : 1,
				"outlettype" : [ "" ],
				"patching_rect" : [ 153.0, 40.0, 25.0, 25.0 ],
				"comment" : ""
			}

		}
, 		{
			"box" : 			{
				"maxclass" : "outlet",
				"id" : "obj-14",
				"numinlets" : 1,
				"numoutlets" : 0,
				"patching_rect" : [ 55.0, 361.0, 25.0, 25.0 ],
				"comment" : ""
			}

		}
 ],
	"lines" : [ 		{
			"patchline" : 			{
				"source" : [ "obj-11", 0 ],
				"destination" : [ "obj-14", 0 ],
				"hidden" : 0,
				"midpoints" : [  ]
			}

		}
, 		{
			"patchline" : 			{
				"source" : [ "obj-13", 0 ],
				"destination" : [ "obj-8", 0 ],
				"hidden" : 0,
				"midpoints" : [  ]
			}

		}
, 		{
			"patchline" : 			{
				"source" : [ "obj-10", 0 ],
				"destination" : [ "obj-2", 0 ],
				"hidden" : 0,
				"midpoints" : [  ]
			}

		}
, 		{
			"patchline" : 			{
				"source" : [ "obj-10", 0 ],
				"destination" : [ "obj-11", 0 ],
				"hidden" : 0,
				"midpoints" : [  ]
			}

		}
, 		{
			"patchline" : 			{
				"source" : [ "obj-8", 0 ],
				"destination" : [ "obj-2", 1 ],
				"hidden" : 0,
				"midpoints" : [  ]
			}

		}
, 		{
			"patchline" : 			{
				"source" : [ "obj-2", 0 ],
				"destination" : [ "obj-11", 1 ],
				"hidden" : 0,
				"midpoints" : [  ]
			}

	simulates the flickering of a television screen
		what is on the tv

help with my first shader