Shader "TouchScript/Cursor"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
	}
	SubShader
	{
		Tags { "Queue"="Transparent" "RenderType" = "Transparent" }
		Blend SrcAlpha OneMinusSrcAlpha
		ZTest Always

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				float4 vertex : SV_POSITION;
			};

			sampler2D _MainTex;
			
			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = v.uv;
				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				float2 uv = float2(length(i.uv - float2(.5, .5)) * 2, 0.5);
				fixed4 col = tex2D(_MainTex, uv);
				return col;
			}
			ENDCG
		}
	}
}