Shader "Bakery/LightFilter"
{
	Properties
	{
		_TransparencyLM ("Transmissive Texture", 2D) = "white" {}
	}
	SubShader
	{
		Tags { "RenderType"="Transparent" "Queue"="Transparent" }
		Cull Off
		Blend DstColor Zero
		ZWrite Off
		LOD 100

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			// make fog work
			#pragma multi_compile_fog
			
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				UNITY_FOG_COORDS(1)
				float4 vertex : SV_POSITION;
			};

			sampler2D _TransparencyLM;
			
			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = v.uv;
				UNITY_TRANSFER_FOG(o,o.vertex);
				return o;
			}
			
			float4 frag (v2f i) : SV_Target
			{
				// sample the texture
				float4 color = tex2D(_TransparencyLM, i.uv);
				// apply fog
				UNITY_APPLY_FOG(i.fogCoord, color);
				return color;
			}
			ENDCG
		}
	}
}