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

Shader "Time of Day/Sun"

{

	Properties

	{

	}

	CGINCLUDE

	#include "UnityCG.cginc"

	#include "TOD_Base.cginc"

	struct v2f {

		float4 position : SV_POSITION;

		half3  tex      : TEXCOORD0;

	};

	v2f vert(appdata_base v) {

		v2f o;

		o.position = TOD_TRANSFORM_VERT(v.vertex);

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

		o.tex.xy = 2.0 * v.texcoord - 1.0;

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

		return o;

	}

	half4 frag(v2f i) : COLOR {

		half4 color = half4(TOD_SunMeshColor, 1);

		half dist = length(i.tex.xy);

		half sun  = step(dist, 0.5) * TOD_SunMeshBrightness;

		half glow = smoothstep(0.0, 1.0, 1.0 - pow(dist, TOD_SunMeshContrast)) * saturate(TOD_SunMeshBrightness);

		color.rgb *= saturate(i.tex.z) * (sun + glow);

		return color;

	}

	ENDCG

	SubShader

	{

		Tags

		{

			"Queue"="Background+30"

			"RenderType"="Background"

			"IgnoreProjector"="True"

		}

		Pass

		{

			ZWrite Off

			ZTest LEqual

			Blend One One

			Fog { Mode Off }

			CGPROGRAM

			#pragma vertex vert

			#pragma fragment frag

			ENDCG

		}

	}

	Fallback Off

}