// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Zhanyou/CameraBlack"
{
	Properties
	{
		_MainTex("Sprite Texture", 2D) = "white" {}
		_Color("Alpha Color Key", Color) = (0,0,0,1)
		_IsGray("IsGray", Range(100, 200.0)) = 100
	}
	SubShader
	{
		Tags
		{
			"RenderType" = "Opaque"
			"Queue" = "Transparent+1"
		}

		Pass
		{
			ZWrite Off
			Blend SrcAlpha OneMinusSrcAlpha

			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag

			sampler2D _MainTex;
			float4 _Color;
			int _IsGray;

			struct Vertex
			{
				float4 vertex : POSITION;
				float2 uv_MainTex : TEXCOORD0;
				float2 uv2 : TEXCOORD1;
			};

			struct Fragment
			{
				float4 vertex : POSITION;
				float2 uv_MainTex : TEXCOORD0;
				float2 uv2 : TEXCOORD1;
			};

			Fragment vert(Vertex v)
			{
				Fragment o;

				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv_MainTex = v.uv_MainTex;
				o.uv2 = v.uv2;

				return o;
			}

			float4 frag(Fragment IN) : COLOR
			{
				half4 c = tex2D(_MainTex, IN.uv_MainTex);

				if (_IsGray > 0)
				{
					half gray = (c.r * 30 + c.g * 59 + c.b * 11) / _IsGray;
					c.r = gray;
					c.g = gray;
					c.b = gray;
				}

				return c;
			}

			ENDCG
		}
	}
}