SurfaceDecalShader

Shader "Custom/TestSurfaceDecal" {
    Properties {
        _Color("Main Color", Color) = (1,1,1,1)
        _MainTex("Base (RGB) Trans (A)", 2D) = "white" {}
        _BumpMap("Normalmap", 2D) = "bump" {}
        _SpecGlossMap("Specular", 2D) = "white" {}
        _Gloss("Gloss", Range(0.0, 1.0)) = 1.0
    }
    SubShader {
        Tags { "RenderType"="Transparent" "IgnoreProjector" = "True" "Queue" = "AlphaTest" }
        LOD 200

        //Blend SrcAlpha OneMinusSrcAlpha

        CGPROGRAM
        // Physically based Standard lighting model, and enable shadows on all light types
        #pragma surface surf StandardSpecular fullforwardshadows decal:blend//alpha:blend

        // Use shader model 3.0 target, to get nicer looking lighting
        #pragma target 3.0

        sampler2D _MainTex;
        sampler2D _BumpMap;
        sampler2D _SpecGlossMap;
        float _Gloss;
        fixed4 _Color;

        struct Input {
            float2 uv_MainTex;
            float2 uv_BumpMap;
            float4 color: Color;
        };

        void surf (Input IN, inout SurfaceOutputStandardSpecular o) {
            fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color  * IN.color;
            o.Albedo = c.rgb;
            o.Alpha = c.a;
            o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
            half4 specGloss = tex2D(_SpecGlossMap, IN.uv_MainTex);
            o.Specular = specGloss.rgb;
            o.Smoothness = specGloss.a*_Gloss;
        }
        ENDCG
    }
    FallBack "Decal/Transparent Diffuse"
}