// Made with Amplify Shader Editor
// Available at the Unity Asset Store - http://u3d.as/y3X
Shader "BF/Models/StaticLightmap"
{
	Properties
	{
		[Gamma]_albedo("albedo", 2D) = "white" {}
		_main_color("main_color", Color) = (1,1,1,1)
		_lightmap("lightmap", 2D) = "black" {}
		_light("light", Range( 1 , 5)) = 1
		_dark("dark", Range( 0 , 1)) = 0
		_gray("gray", Range( 0 , 2)) = 1
		_fog_color("fog_color", Color) = (0,0,0,0)
		_fog_range("fog_range", Float) = 1
		_fog_density("fog_density", Float) = 100
		[HideInInspector] _texcoord2( "", 2D ) = "white" {}
		[HideInInspector] _texcoord( "", 2D ) = "white" {}
	}

	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 100

		CGINCLUDE
		#pragma target 3.0
		ENDCG
		Blend Off
		Cull Back
		ColorMask RGBA
		ZWrite On
		ZTest LEqual
		Offset 0 , 0

		Pass
		{
			Name "Unlit"
			Tags { "LightMode"="ForwardBase" }
			CGPROGRAM

			#ifndef UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX
				//only defining to not throw compilation error over Unity 5.5
				#define UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input)
			#endif

			#pragma vertex vert
			#pragma fragment frag
			#pragma multi_compile_instancing
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float4 color : COLOR;
				UNITY_VERTEX_INPUT_INSTANCE_ID
				float4 texcoord1 : TEXCOORD1;
				float4 texcoord : TEXCOORD0;
			};

			struct v2f
			{
				float4 vertex : SV_POSITION;
				UNITY_VERTEX_INPUT_INSTANCE_ID
				UNITY_VERTEX_OUTPUT_STEREO
				float4 texcoord : TEXCOORD0;
				float4 texcoord1 : TEXCOORD1;
			};

			uniform sampler2D _lightmap;
			uniform float4 _lightmap_ST;
			uniform float _gray;
			uniform float _light;
			uniform float _dark;
			uniform float4 _main_color;
			uniform sampler2D _albedo;
			uniform float4 _albedo_ST;
			uniform float4 _fog_color;
			uniform float _fog_range;
			uniform float _fog_density;

			v2f vert ( appdata v )
			{
				v2f o;
				UNITY_SETUP_INSTANCE_ID(v);
				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
				UNITY_TRANSFER_INSTANCE_ID(v, o);

				float3 worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
				o.texcoord1.xyz = worldPos;
				o.texcoord.xy = v.texcoord1.xy;
				o.texcoord.zw = v.texcoord.xy;
				//setting value to unused interpolator channels and avoid initialization warnings
				o.texcoord1.w = 0;
				o.vertex = UnityObjectToClipPos(v.vertex);
				return o;
			}

			fixed4 frag (v2f i ) : SV_Target
			{
				UNITY_SETUP_INSTANCE_ID(i);
				UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);

				float2 uv_lightmap = i.texcoord.xy * _lightmap_ST.xy + _lightmap_ST.zw;
				float4 ligthMapColor = tex2D(_lightmap, uv_lightmap);
				float4 temp_cast = (-1.0).xxxx;
				float4 lerpLightColor = lerp((ligthMapColor * (ligthMapColor * _gray) * _light) , temp_cast , _dark);
				float2 uv_albedo = i.texcoord.zw * _albedo_ST.xy + _albedo_ST.zw;
				float3 worldPos = i.texcoord1.xyz;
				float clampFog = clamp(((worldPos.z - _fog_range) / (_fog_density - _fog_range)), 0, 1);
				float4 result = lerp((lerpLightColor * (_main_color * tex2D(_albedo, uv_albedo))), _fog_color, clampFog);
				return result;
			}
			ENDCG
		}
	}
}