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

Shader "Time of Day/Moon"

{

	Properties

	{

		_MainTex ("Base (RGB)", 2D) = "white" {}

	}

	CGINCLUDE

	#include "UnityCG.cginc"

	#include "TOD_Base.cginc"

	uniform sampler2D _MainTex;

	uniform float4 _MainTex_ST;

	struct v2f {

		float4 position : SV_POSITION;

		half3  tex      : TEXCOORD0;

		half3  normal   : TEXCOORD1;

	};

	v2f vert(appdata_base v) {

		v2f o;

		o.position = TOD_TRANSFORM_VERT(v.vertex);

		o.normal = normalize(mul((float3x3)unity_ObjectToWorld, v.normal));

		float3 skyPos = mul(TOD_World2Sky, mul(unity_ObjectToWorld, v.vertex)).xyz;

		o.tex.xy = TRANSFORM_TEX(v.texcoord, _MainTex);

		o.tex.z  = skyPos.y * 25;

		return o;

	}

	half4 frag(v2f i) : COLOR {

		half4 color = half4(TOD_MoonMeshColor, 1);

		half alpha = max(0, dot(i.normal, TOD_SunDirection));

		alpha = saturate(i.tex.z) * TOD_MoonMeshBrightness * pow(alpha, TOD_MoonMeshContrast);

		half3 maintex = tex2D(_MainTex, i.tex).rgb;

		color.rgb *= maintex * alpha;

		return color;

	}

	ENDCG

	SubShader

	{

		Tags

		{

			"Queue"="Background+40"

			"RenderType"="Background"

			"IgnoreProjector"="True"

		}

		Pass

		{

			ZWrite Off

			ZTest LEqual

			Fog { Mode Off }

			CGPROGRAM

			#pragma vertex vert

			#pragma fragment frag

			ENDCG

		}

	}

	Fallback Off

}