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

Shader "UI/UI_dissWithAlpha"
{
    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

        _NoiseTex("Noise", 2D) = "white" {}
        _Threshold("Threshold", Range(-0.2, 1.2)) = 1.2
        _EdgeLength("Edge Length", Range(0.0, 0.4)) = 0.3
        _EdgeColor("Edge Color", Color) = (1,1,1,1)

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

    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;
                float2 uvNoiseTex : TEXCOORD2;
                UNITY_VERTEX_OUTPUT_STEREO
            };

            fixed4 _Color;
            fixed4 _TextureSampleAdd;
            float4 _ClipRect;


            sampler2D _MainTex;
            float4 _MainTex_ST;
            sampler2D _NoiseTex;
            float4 _NoiseTex_ST;
            float _Threshold;
            float _EdgeLength;
            fixed4 _EdgeColor;

            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 = v.texcoord;

                OUT.uvNoiseTex = TRANSFORM_TEX(v.texcoord, _NoiseTex);

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

            fixed4 frag(v2f IN) : SV_Target
            {
                half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd);// * IN.color;

                fixed cutout = tex2D(_NoiseTex, IN.uvNoiseTex).r;
                if(_Threshold > 1.0)
                {
                    return float4(1.0,1.0,1.0, color.a > 0.1 ? (_Threshold -  1.0) / 0.2 : 0.0);
                }
                clip(cutout - _Threshold);
				
				if (dot(IN.color, float3(1,1,1)) < 0.01)
				{
					float grey = dot(color.rgb, float3(0.299, 0.587, 0.114));  
					color.rgb = float3(grey, grey, grey);
					color.a *= IN.color.a;
				}
				else
				{
					color = color*IN.color;
				}

                //边缘颜色
                if(cutout - _Threshold > 0.0 && cutout - _Threshold < _EdgeLength)
                {
                    fixed4 ec = _EdgeColor;
                    ec.rgb = color.rgb;
                    if(color.a >= 0.05)
                    {
                        ec.a = ((cutout - _Threshold)) / _EdgeLength * color.a;
                    }else
                    {
                        ec.a = 0.0;
                    }

                    
                    return  ec;
                }

                #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
        }
    }
}