// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

Shader "Portals/Sky" {
	Properties {
	_TintColor ("Tint Color", Color) = (0.5,0.5,0.5,1)
	_Cube ("Environment Map", Cube) = "" {}
}
Category {
	
	Tags { "Queue"="Transparent-1" "IgnoreProjector"="True" "RenderType"="Transparent" }
				Blend SrcAlpha OneMinusSrcAlpha
				Cull Off 
				Lighting Off 
				ZWrite Off

	SubShader {
	
	Stencil {
		Ref 2
		Comp Equal
		Pass Keep
		Fail Keep
	}
		Pass {
				

			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag

			#include "UnityCG.cginc"

			fixed4 _TintColor;
			samplerCUBE _Cube;   

			struct appdata_t {
				float4 vertex : POSITION;
			};

			struct v2f {
				float4 vertex : POSITION;
				float3 viewDir : TEXCOORD1;
			};
			
			float4 _MainTex_ST;

			v2f vert (appdata_t v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.viewDir = mul(unity_ObjectToWorld, v.vertex).xyz - _WorldSpaceCameraPos;
				return o;
			}

			fixed4 frag (v2f i) : COLOR
			{
				float4 cubeTex = texCUBE(_Cube, i.viewDir)*_TintColor;
				return cubeTex;
			}
			ENDCG 
		}
	}	
}
}