Shader "Custom/LFade" {
	Properties {
		_Color ("Main Color", Color) = (1, 1, 1, 1)       
		_DawnTex ("Dawn (RGB)", 2D) = "white" {}
		_DayTex ("Day (RGB)", 2D) = "white" {}
		_DuskTex ("Dusk (RGB)", 2D) = "white" {}
		_NightTex ("Night (RGB)", 2D) = "white" {}
		_ViharTex ("Storm (RGB)", 2D) = "white" {}
		_Csuszka ("Day cycle", Range (0,4)) = 2.0
		_ViharCsuszka ("Storm scale", Range (0,0.9)) = 0.3
	}
	SubShader {
		Tags { "RenderType"="Opaque" "IgnoreProjector"="True" }    
		
		Pass
		{       
			Tags { "LightMode"= "Always" }
			Lighting Off
			SetTexture[_DawnTex]
			SetTexture[_DayTex]
			SetTexture[_DuskTex]
			SetTexture[_NightTex]

		}
		
		CGPROGRAM
		#pragma surface surf Unlit noambient novertexlights noforwardadd
		#pragma target 3.0

		sampler2D _DawnTex;
		sampler2D _DayTex;
		sampler2D _DuskTex;
		sampler2D _NightTex;
		sampler2D _ViharTex;
		float _Csuszka;
		float _ViharCsuszka;

		struct Input {
			float2 uv_DawnTex;
			float2 uv_DayTex;
			float2 uv_DuskTex;
			float2 uv_NightTex;
			float2 uv_ViharTex;
		};

		void surf (Input IN, inout SurfaceOutput o) {
			half4 dawn = tex2D (_DawnTex, IN.uv_DawnTex);
			half4 day = tex2D (_DayTex, IN.uv_DayTex);
			half4 dusk = tex2D (_DuskTex, IN.uv_DuskTex);
			half4 night = tex2D (_NightTex, IN.uv_NightTex);
			half4 storm = tex2D (_ViharTex, IN.uv_ViharTex);
			half4 output;
			if(_Csuszka <= 1)
			{
				output = lerp(dawn, day, _Csuszka);
			}
			else if(_Csuszka > 1 && _Csuszka <= 2)
			{
				output = lerp(day, dusk, _Csuszka - 1);
			}
			else if(_Csuszka > 2 && _Csuszka <= 3)
			{
				output = lerp(dusk, night, _Csuszka - 2);
			}
			else if(_Csuszka > 3 && _Csuszka <= 4)
			{
				output = lerp(night, dawn, _Csuszka - 3);
			}
			
			
			
			half4 viharedOutput = lerp(output, storm, _ViharCsuszka);
			
			o.Albedo = viharedOutput.rgb ;
		}
		
		half4 LightingUnlit(SurfaceOutput s, half3 lightDir, half atten)
		{
			return half4(s.Albedo, s.Alpha);
		}

		ENDCG
	} 
	FallBack "Diffuse"
}