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Shader "Tiles" {

    Properties {

        _MainTex ("Base (RGB)", 2D) = "white" {}

        _gNumTiles ("Number Of Tiles", Range (1,100)) = 1

        _gThreshhold ("Edge Width", Range (0.0,2.0)) = 0.15

        _gEdgeColor ("Color", Color)  = (.5, .5, .5, 1)

    }

    SubShader {

        Tags { "RenderType"="Opaque" }

        LOD 200

        

        CGPROGRAM

        #pragma surface surf Lambert

 

        sampler2D _MainTex;

 

        struct Input {

            float2 uv_MainTex;

        };

        

        float _gNumTiles;

        float _gThreshhold;

        float4 _gEdgeColor;

        

    void surf (Input IN, inout SurfaceOutput o) {

            

        half size = 1.0/_gNumTiles;

        half2 Pbase = IN.uv_MainTex - fmod(IN.uv_MainTex,size.xx);

        half2 PCenter = Pbase + (size/2.0).xx;

        half2 st = (IN.uv_MainTex - Pbase)/size;

        half4 c1 = (half4)0;

        half4 c2 = (half4)0;

        half4 invOff = half4((1-_gEdgeColor.xyz),1);

        if (st.x > st.y) { c1 = invOff; }

        half threshholdB =  1.0 - _gThreshhold;

        if (st.x > threshholdB) { c2 = c1; }

        if (st.y > threshholdB) { c2 = c1; }

        half4 cBottom = c2;

        c1 = (half4)0;

        c2 = (half4)0;

        if (st.x > st.y) { c1 = invOff; }

        if (st.x < _gThreshhold) { c2 = c1; }

        if (st.y < _gThreshhold) { c2 = c1; }

        half4 cTop = c2;

        half4 tileColor = tex2D(_MainTex,PCenter);

        half4 result = tileColor + cTop - cBottom;

        o.Albedo = result.rgb;

        o.Alpha = result.a;

            

        }

        ENDCG

    } 

    FallBack "Diffuse"

}