PBS surface shader

pbs.txt

Shader "Custom/SurfaceStandard" {
	Properties {
		_Color("Color", Color) = (1,1,1)	
		_MainTex("Diffuse", 2D) = "white" {}
		[NoScaleOffset] _SpecGlossMap("Specular", 2D) = "white" {}
        	[NoScaleOffset] _BumpMap("Normal Map", 2D) = "bump" {}
	        _BumpScale("Scale", Float) = 1.0
	        [NoScaleOffset] _Occlusion("Occlusion", 2D) = "white" {}
	        [NoScaleOffset] _EmissionMap("Emission", 2D) = "black" {}
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
		CGPROGRAM
		#pragma surface surf StandardPBS fullforwardshadows
	        #pragma target 3.0
	    
	        #define _GLOSSYENV 1
	        #include "UnityPBSLighting.cginc"
	    
	        sampler2D _MainTex;
	        sampler2D _SpecGlossMap;
	        sampler2D _Occlusion;
	        sampler2D _EmissionMap;
	        sampler2D _BumpMap;
	        fixed4 _Color;
	        half _BumpScale;

		struct Input {
			float2 uv_MainTex;
		};

	        void surf (Input IN, inout SurfaceOutputPBS o) {
	        	fixed4 diff = tex2D (_MainTex, IN.uv_MainTex) * _Color;
	        	fixed4 spec = tex2D (_SpecGlossMap, IN.uv_MainTex);
	        	o.Albedo = diff.rgb;
	        	o.Specular = spec.rgb;
	        	o.Smoothness = spec.a;
	        	o.Alpha = diff.a;
	        	o.Occlusion = tex2D(_Occlusion, IN.uv_MainTex).g;
	        	o.Normal = normalize(UnpackScaleNormal(tex2D(_BumpMap, IN.uv_MainTex), _BumpScale));
	        }
		ENDCG
	}
}

[NoScaleOffset]

Documentation wants it, documentation is HUNGRY!
(I might be wrong and it's there, and I simply don't know where to look, but generally the documention for the shader side (especially awesome stuff) is severly lacking!)