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

Shader "Time of Day/Cloud Billboard Far"

{

	Properties

	{

		_MainTex ("Density Map (RGBA)", 2D) = "white" {}

		_BumpMap ("Normal Map", 2D) = "bump" {}

	}

	CGINCLUDE

	#include "UnityCG.cginc"

	#include "TOD_Base.cginc"

	#include "TOD_Clouds.cginc"

	#define TOD_SCATTERING_RAYLEIGH 0

	#include "TOD_Scattering.cginc"

	uniform sampler2D _MainTex;

	uniform sampler2D _BumpMap;

	uniform float4 _MainTex_ST;

	uniform float4 _BumpMap_ST;

	struct v2f {

		float4 position : SV_POSITION;

		float4 color    : TEXCOORD0;

		float4 texcoord : TEXCOORD1;

		float3 viewDir  : TEXCOORD2;

		float3 lightDir : TEXCOORD3;

		float3 lightCol : TEXCOORD4;

	};

	v2f vert(appdata_tan v) {

		v2f o;

		o.position = TOD_TRANSFORM_VERT(v.vertex);

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

		o.texcoord.zw = TRANSFORM_TEX(v.texcoord, _BumpMap);

		o.viewDir = normalize(mul(TOD_World2Sky, mul(unity_ObjectToWorld, v.vertex)).xyz);

		o.lightDir = TOD_LocalSunDirection;

		o.lightCol = ScatteringColor(o.viewDir, TOD_CloudScattering);

		o.color.rgb = CloudColor(o.viewDir, o.lightDir);

		o.color.a   = TOD_CloudOpacity;

		TANGENT_SPACE_ROTATION;

		o.viewDir = normalize(mul(rotation, o.viewDir));

		o.lightDir = normalize(mul(rotation, o.lightDir));

		return o;

	}

	half4 frag(v2f i) : COLOR {

		return CloudBillboardColor(_MainTex, _BumpMap, i.texcoord, i.color, i.viewDir, i.lightDir, i.lightCol);

	}

	ENDCG

	SubShader

	{

		Tags

		{

			"Queue"="Geometry+520"

			"RenderType"="Background"

			"IgnoreProjector"="True"

		}

		Pass

		{

			ZWrite Off

			ZTest LEqual

			Blend SrcAlpha OneMinusSrcAlpha

			Fog { Mode Off }

			CGPROGRAM

			#pragma vertex vert

			#pragma fragment frag

			#pragma multi_compile _ TOD_CLOUDS_DENSITY

			#pragma multi_compile _ TOD_CLOUDS_BUMPED

			ENDCG

		}

	}

	Fallback Off

}