Shader "Infinity Code/Online Maps/Tileset Fade Shader"
{
	Properties
	{
		_Color("Main Color", Color) = (1,1,1,1)
		_MainTex("Base (RGB) Trans (A)", 2D) = "white" {}
		_OverlayBackTex("Overlay Back Texture", 2D) = "black" {}
		_OverlayBackAlpha("Overlay Back Alpha", Range(0, 1)) = 1
		_TrafficTex("Traffic Texture", 2D) = "black" {}
		_OverlayFrontTex("Overlay Front Texture", 2D) = "black" {}
		_OverlayFrontAlpha("Overlay Front Alpha", Range(0, 1)) = 1
	}

		SubShader
	{
		Tags{ "Queue" = "Transparent-100" "IgnoreProjector" = "True" "RenderType" = "Transparent" }
		LOD 200

		CGPROGRAM
#pragma surface surf Lambert alpha

		sampler2D _MainTex;

		static const int _MaxSegments = 128;

        uniform int _CountSegments;
		uniform float4 _Segments[_MaxSegments * 2]; // [start, end, start, end, ...]
		uniform int _SegmentsThickness;
		uniform fixed4 _SegmentsColor;

		struct Input
		{
			float2 uv_MainTex;
			float3 worldPos;
		};

		float sdf(float2 p, float2 a, float2 b)
		{
			float2 pa = p - a, ba = b - a;
			float h = saturate(dot(pa, ba) / dot(ba, ba));
			return length(pa - ba * h);
		}

		void surf(Input IN, inout SurfaceOutput o)
		{
			fixed4 c = tex2D(_MainTex, IN.uv_MainTex);
		    fixed3 rgb = c.rgb;

            const float2 wp = float2(IN.worldPos.x, IN.worldPos.z);

		    [loop]
		    for (int i = 0; i < _CountSegments; ++i)
		    {
			    float4 start = _Segments[i * 2];
		    	float4 end = _Segments[i * 2 + 1];
		    	float d = sdf(wp, start.xy, end.xy);
		    	if (d < _SegmentsThickness)
		    	{
		    		rgb = lerp(rgb, _SegmentsColor.rgb, _SegmentsColor.a);
		    		break;
		    	}
		    }
		    
            o.Albedo = rgb;
            o.Alpha = c.a;
		}
		ENDCG
	}

	Fallback "Transparent/Cutout/Diffuse"
}