Shader "UI/UIGuideMask"
{
	Properties
	{
		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
		_Color("Tint", Color) = (1,1,1,1)

		_StencilComp("Stencil Comparison", Float) = 8
		_Stencil("Stencil ID", Float) = 0
		_StencilOp("Stencil Operation", Float) = 0
		_StencilWriteMask("Stencil Write Mask", Float) = 255
		_StencilReadMask("Stencil Read Mask", Float) = 255

		_ColorMask("Color Mask", Float) = 15


		[Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip("Use Alpha Clip", Float) = 0


		//-------------------add----------------------
		_DefaultState("DefaultState", Int) = 1
		_IsClose("IsClose", Int) = 0
		_Center("Center", vector) = (0, 0, 0, 0)
		_RectSize("RectWSize", vector) = (20, 20, 0, 0)
		//_Silder("_Silder", Range(0,2000)) = 1000 // sliders
		//-------------------add----------------------
	}

	SubShader
	{
		Tags
		{
			"Queue" = "Transparent"
			"IgnoreProjector" = "True"
			"RenderType" = "Transparent"
			"PreviewType" = "Plane"
			"CanUseSpriteAtlas" = "True"
		}

		Stencil
		{
			Ref[_Stencil]
			Comp[_StencilComp]
			Pass[_StencilOp]
			ReadMask[_StencilReadMask]
			WriteMask[_StencilWriteMask]
		}

		Cull Off
		Lighting Off
		ZWrite Off
		ZTest[unity_GUIZTestMode]
		Blend SrcAlpha OneMinusSrcAlpha
		ColorMask[_ColorMask]

		Pass
		{
			Name "Default"
		CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma target 2.0

			#include "UnityCG.cginc"
			#include "UnityUI.cginc"

			#pragma multi_compile __ UNITY_UI_ALPHACLIP

			struct appdata_t
			{
				float4 vertex   : POSITION;
				float4 color    : COLOR;
				float2 texcoord : TEXCOORD0;
				UNITY_VERTEX_INPUT_INSTANCE_ID
			};

			struct v2f
			{
				float4 vertex   : SV_POSITION;
				fixed4 color : COLOR;
				float2 texcoord  : TEXCOORD0;
				float4 worldPosition : TEXCOORD1;
				UNITY_VERTEX_OUTPUT_STEREO

			};

			fixed4 _Color;
			fixed4 _TextureSampleAdd;
			float4 _ClipRect;
			//-------------------add----------------------
			//float _Silder;
			fixed _DefaultState;
			fixed _IsClose;
			float2 _Center;
			half2 _RectSize;
			//-------------------add----------------------
			v2f vert(appdata_t IN)
			{
				v2f OUT;
				UNITY_SETUP_INSTANCE_ID(IN);
				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
				OUT.worldPosition = IN.vertex;
				OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);

				OUT.texcoord = IN.texcoord;
				OUT.color = IN.color * _Color;
				return OUT;
			}

			sampler2D _MainTex;

			fixed4 frag(v2f IN) : SV_Target
			{
				if (_DefaultState)
					return half4(0,0,0,0);

				float a = distance(IN.worldPosition.x, _Center.x)/ _RectSize.x;
				float b = distance(IN.worldPosition.y, _Center.y)/ _RectSize.y;

				half2 uv = IN.texcoord;
				uv.x = a + .5f;
				uv.y = b + .5f;

				half4 color = (tex2D(_MainTex, uv) + _TextureSampleAdd) * IN.color;

				color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
				#ifdef UNITY_UI_ALPHACLIP
				clip(color.a - 0.001);
				#endif

				color.a = a < 1 && b < 1 ? sin(a)*pow(a, 2) + sin(b)*pow(b, 2) : color.a;
				color.a = step(IN.color.a, color.a) ? IN.color.a:color.a;
				return color;

			}
		ENDCG
		}
	}
}