// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

Shader "FairyGUI/EyeOpeningEffect"
{
	Properties
	{
		_MainTex("Base (RGB), Alpha (A)", 2D) = "black" {}

		_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

		[Space(100)]
		_Param("Param", vector) = (0.6, 0.3, 1, 1)
	}

		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_CLIP_RECT
	#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
		};

		sampler2D _MainTex;
		fixed4 _Color;
		fixed4 _TextureSampleAdd;
		float4 _ClipRect;
		float4 _MainTex_ST;
		half3 _Param;

		v2f vert(appdata_t v)
		{
			v2f OUT;
			UNITY_SETUP_INSTANCE_ID(v);
			UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
			OUT.worldPosition = v.vertex;
			OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);

			OUT.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);

			OUT.color = v.color * _Color;
			return OUT;
		}

		fixed4 frag(v2f IN) : SV_Target
		{
			//half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;
			half4 color = IN.color;
			half x = IN.texcoord.x - 0.5;
			half y = IN.texcoord.y - 0.5;
			half oval = x * x / (_Param.x * _Param.x) + y * y / (_Param.y * _Param.y);
			color.a = oval;

	#ifdef UNITY_UI_CLIP_RECT
			color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
	#endif

	#ifdef UNITY_UI_ALPHACLIP
			clip(color.a - 0.001);
	#endif

			return color;
		}
			ENDCG
		}
		}
}