Shader "Terrain Grid System/Unlit Highlight Ground Texture" {
Properties {
    _Color ("Tint Color", Color) = (1,1,1,0.5)
    _Color2 ("Color", Color) = (0,1,0,0)
    _Offset ("Depth Offset", Int) = -1    
    _MainTex("Texture", 2D) = "black" {}
    _FadeAmount("Fade Amount", Float) = 0
    _Scale ("Scale Min", Float) = 1.0
    _ZWrite("ZWrite", Int) = 0
    _SrcBlend("Src Blend", Int) = 5
    _DstBlend("Dst Blend", Int) = 10
    _Cull ("Cull", Int) = 2
    _ZTest("ZTest", Int) = 4
    _HighlightBorderColor("Highlight Border Color", Color) = (1,1,1)
	_HighlightBorderSize("Highlight Border Size", Float) = 1
	_Mask("Mask Texture", 2D) = "white" {}
}
SubShader {
    Tags {
      "Queue"="Geometry+205"
      "RenderType"="Transparent"
  	}
  	Offset [_Offset], [_Offset]
    Blend [_SrcBlend] [_DstBlend]
  	ZWrite [_ZWrite]
  	Cull [_Cull]
  	ZTest [_ZTest]

    	Pass {
			CGPROGRAM						
			#pragma fragment frag			
			#pragma vertex vert			
			#pragma multi_compile_local _ TGS_TRANSPARENT
			#pragma multi_compile_local _ TGS_TEX_HIGHLIGHT_ADDITIVE TGS_TEX_HIGHLIGHT_MULTIPLY TGS_TEX_HIGHLIGHT_COLOR TGS_TEX_HIGHLIGHT_SCALE TGS_TEX_DUAL_COLORS
			#include "UnityCG.cginc"		

			sampler2D _MainTex;
			fixed4 _Color, _Color2, _HighlightBorderColor;								
			fixed _FadeAmount, _Scale, _HighlightBorderSize;
			sampler2D _MaskTex;

			struct AppData {
				float4 vertex : POSITION;	
				float2 texcoord: TEXCOORD0;			
				UNITY_VERTEX_INPUT_INSTANCE_ID
			};

			struct v2f {
				float4 pos : SV_POSITION;	
				float2 uv: TEXCOORD0;			
				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);	
				o.uv = v.texcoord;
				return o;								
			}

			fixed4 frag(v2f i) : SV_Target {
				fixed4 color = _Color;
				#if TGS_TRANSPARENT
					#if TGS_TEX_HIGHLIGHT_ADDITIVE
						fixed4 pixel = tex2D(_MainTex, i.uv);
						color.rgb = lerp(pixel.rgb + color.rgb, pixel.rgb, _FadeAmount) * pixel.aaa;
						color.a = pixel.a;
					#elif TGS_TEX_HIGHLIGHT_MULTIPLY
						fixed4 pixel = tex2D(_MainTex, i.uv);
						color.rgb = lerp(pixel.rgb * color.rgb, pixel.rgb, _FadeAmount) * pixel.aaa;
						color.a = pixel.a;
					#elif TGS_TEX_HIGHLIGHT_COLOR
						fixed4 pixel = tex2D(_MainTex, i.uv);
						color.rgb = lerp(pixel.rgb, color.rgb, _FadeAmount) * pixel.aaa;
						color.a = pixel.a;
					#elif TGS_TEX_HIGHLIGHT_SCALE
						fixed4 pixel = tex2D(_MainTex, 0.5 + (i.uv - 0.5) * _Scale);
						color.rgb = pixel.rgb * lerp(color.rgb, 1.0, _FadeAmount) * pixel.aaa;
						color.a = pixel.a;
                	#elif TGS_TEX_DUAL_COLORS
	                    fixed4 pixel = tex2D(_MainTex, i.uv);
    	                color.rgb = lerp(color.rgb * color.a, pixel.rgb * pixel.a, _FadeAmount);
            	        color = lerp(_Color2, color, _FadeAmount);
					#else
						fixed4 pixel = tex2D(_MainTex, i.uv);
						color = lerp(color, pixel, _FadeAmount);
					#endif
				#else
					#if TGS_TEX_HIGHLIGHT_ADDITIVE
						fixed4 pixel = tex2D(_MainTex, i.uv);
						color.rgb = lerp(pixel.rgb + color.rgb, pixel.rgb, _FadeAmount) * pixel.aaa;
						color.a = 1.0 - pixel.a;
					#elif TGS_TEX_HIGHLIGHT_MULTIPLY
						fixed4 pixel = tex2D(_MainTex, i.uv);
						color.rgb = pixel.rgb * lerp(color.rgb, 1.0, _FadeAmount) * pixel.aaa;
						color.a = 1.0 - pixel.a;
					#elif TGS_TEX_HIGHLIGHT_COLOR
						fixed4 pixel = tex2D(_MainTex, i.uv);
						color.rgb = lerp(pixel.rgb, color.rgb, _FadeAmount) * pixel.aaa;
						color.a = 1.0 - pixel.a;
					#elif TGS_TEX_HIGHLIGHT_SCALE
						fixed4 pixel = tex2D(_MainTex, 0.5 + (i.uv - 0.5) * _Scale);
						color.rgb = pixel.rgb * lerp(color.rgb, 1.0, _FadeAmount) * pixel.aaa;
						color.a = 1.0 - pixel.a;
            	    #elif TGS_TEX_DUAL_COLORS
	                    fixed4 pixel = tex2D(_MainTex, i.uv);
    	                color.rgb = lerp(color.rgb * color.a, pixel.rgb * pixel.a, _FadeAmount);
        	            color.a = 1.0 - color.a;
            	        color = lerp(_Color2, color, _FadeAmount);
					#else
						fixed4 pixel = tex2D(_MainTex, i.uv);
						color.rgb = lerp(color.rgb * color.a, pixel.rgb * pixel.a, _FadeAmount);
						color.a = 1.0 - color.a;
					#endif
				#endif

				fixed isBorder = any(abs(i.uv.xy-0.5)>_HighlightBorderSize);
				color = lerp(color, _HighlightBorderColor, isBorder);

				fixed4 mask = tex2D(_MaskTex, i.uv);
				color *= mask;
			
				return color;
			}

			ENDCG		

		}
}
 
}