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

Shader "Time of Day/Space"

{

	Properties

	{

		_CubeTex ("Cube (RGB)", Cube) = "black" {}

		_Brightness ("Brightness", float) = 0

	}

	CGINCLUDE

	#include "UnityCG.cginc"

	#include "TOD_Base.cginc"

	uniform samplerCUBE _CubeTex;

	uniform float _Brightness;

	struct v2f {

		float4 position : SV_POSITION;

		float4 viewdir  : TEXCOORD0;

	};

	v2f vert(appdata_base v) {

		v2f o;

		o.position = TOD_TRANSFORM_VERT(v.vertex);

		float3 vertnorm = normalize(v.vertex.xyz);

		float3 worldNormal = normalize(mul((float3x3)unity_ObjectToWorld, vertnorm));

		o.viewdir.xyz = vertnorm;

		o.viewdir.w   = saturate(_Brightness * TOD_StarVisibility * worldNormal.y);

		return o;

	}

	half4 frag(v2f i) : COLOR {

		return half4(texCUBE(_CubeTex, i.viewdir.xyz).rgb * i.viewdir.w, 1);

	}

	ENDCG

	SubShader

	{

		Tags

		{

			"Queue"="Background+10"

			"RenderType"="Background"

			"IgnoreProjector"="True"

		}

		Pass

		{

			ZWrite Off

			ZTest LEqual

			Fog { Mode Off }

			CGPROGRAM

			#pragma vertex vert

			#pragma fragment frag

			ENDCG

		}

	}

	Fallback Off

}