Unlit Ping Pong

//by cale bradbury - netgrind.net
//share and shit, don't remove these comments
Shader "Unlit/Ping Pong" {
    Properties {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
    }
    Category{
        Blend SrcAlpha OneMinusSrcAlpha
        AlphaTest Greater 0
        Tags {"Queue"="Transparent"}
        SubShader {
            Pass{
                CGPROGRAM
                #include "UnityCG.cginc"
                #pragma vertex vert_img
                #pragma fragment frag
                sampler2D _MainTex;
                float4 _MainTex_ST;

                fixed4 frag (v2f_img i) : COLOR{
                    return tex2D(_MainTex,abs(fmod(i.uv*_MainTex_ST.xy+_MainTex_ST.zw,float2(2.0,2.0))-float2(1.0,1.0)));
                }
                ENDCG
            }
        }
    }
    FallBack "Unlit"
}