Shader "Myshader/Map"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Grid ("Grid", 2D) = "white" {}
        _Color("Color",COLOR) = (1,1,1,1)
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float4 uv : TEXCOORD0;
            };

            struct v2f
            {
                float4 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            sampler2D _Grid;
            float4 _Grid_ST;
            fixed4 _Color;
            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv.xy = TRANSFORM_TEX(v.uv, _MainTex);
                o.uv.zw = TRANSFORM_TEX(v.uv, _Grid);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                // sample the texture
                fixed4 col = tex2D(_MainTex, i.uv.xy);
                fixed4 col2 = tex2D(_Grid, i.uv.zw);
                return col * (col2 + _Color);
            }
            ENDCG
        }
    }
}