Shader "Terrain Grid System/Unlit Fade" {
 
Properties {
    _Color ("Color", Color) = (1,1,1,1)
    _Offset ("Depth Offset", float) = -1
    _NearClip ("Near Clip", Range(0, 1000.0)) = 25.0
    _FallOff ("FallOff", Range(1, 1000.0)) = 50.0
    _FarFadeDistance ("Far Fade Distance", Float) = 10000
    _FarFadeFallOff ("Far Fade FallOff", Range(1, 1000.0)) = 50.0
    _CircularFadeDistance ("Circular Fade Distance", Float) = 250000
    _CircularFadeFallOff ("Circular Fade FallOff", Float) = 50.0
    _ZTest("ZTest", Int) = 4
}
 
SubShader {
    Tags {
      "Queue"="Transparent"
      "RenderType"="Transparent"
  	}
	Offset [_Offset], [_Offset]
	Blend SrcAlpha OneMinusSrcAlpha
  	ZTest [_ZTest]
	ZWrite Off
    Pass {
    	CGPROGRAM
		#pragma vertex vert	
		#pragma fragment frag
		#pragma multi_compile __ TGS_NEAR_CLIP_FADE
		#pragma multi_compile __ TGS_FAR_FADE
		#pragma multi_compile __ TGS_CIRCULAR_FADE
		#include "UnityCG.cginc"			
		#include "TGSCommon.cginc"

		struct AppData {
			float4 vertex : POSITION;
			UNITY_VERTEX_INPUT_INSTANCE_ID
		};

		struct v2f {
			fixed4 pos : SV_POSITION;	
			fixed4 color: COLOR;
			UNITY_VERTEX_OUTPUT_STEREO
		};
		
		
		v2f vert(AppData v) {
			v2f o;
			UNITY_SETUP_INSTANCE_ID(v);
			UNITY_INITIALIZE_OUTPUT(v2f, o);
			UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);

			o.pos = UnityObjectToClipPos(v.vertex);
			APPLY_FADE(_Color, v.vertex, o.pos, o.color)
			return o;									
		}
		
		fixed4 frag(v2f i) : SV_Target {
			return i.color;
		}
			
		ENDCG
    }
    
}
}