Shader "Custom/ColorBlender"
{
    Properties {
        [HDR] _Color("Color", Color) = (1,1,1,1)
        [Enum(UnityEngine.Rendering.CullMode)] _Culling ("Cull Mode", Int) = 2
        [Enum(Off,0,On,1)] _ZWrite("ZWrite", Int) = 1
        [Enum(UnityEngine.Rendering.CompareFunction)] _ZTest ("ZTest", Int) = 4

        [Enum(UnityEngine.Rendering.BlendMode)] _BlendSrc ("Blend mode Source", Int) = 2
        [Enum(UnityEngine.Rendering.BlendMode)] _BlendDst ("Blend mode Destination", Int) = 2
    }
    SubShader
    {
        Tags { "Queue" = "Overlay" }

        Pass
        {

            Cull [_Culling]
            Offset [_Offset], [_Offset]
            ZWrite [_ZWrite]
            ZTest [_ZTest]
            Blend [_BlendSrc] [_BlendDst]

            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

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

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = ComputeGrabScreenPos(o.vertex);
                return o;
            }

            fixed4 _Color;

            fixed4 frag (v2f i) : SV_Target
            {
                return _Color;
            }
            ENDCG
        }
    }
}