Shader "FOW/Fade In" {
	Properties {
		_FOW ("Fog of war texture", 2D) = "white" {}
	}

	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200

		CGPROGRAM
		#pragma surface surf Lambert

		sampler2D _FOW;

		struct Input {
			float2 uv_MainTex;
		};

		void surf( Input IN, inout SurfaceOutput o ) {
			float lastFog = tex2D( _FOW, IN.uv_MainTex ).a;
			if( lastFog < 0.5 ) {
				o.Alpha = lastFog + 0.05;
			}
			o.Alpha = 1;
		}

		ENDCG
	}
	Fallback "Diffuse"
}