Shader "DashGame/Mask"
{
	Properties
	{
		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
		_Color("Tint", Color) = (1,1,1,1)
		[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
	}

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

		Cull Off
		Lighting Off
		ZWrite Off

		Pass
	{
		Blend SrcAlpha OneMinusSrcAlpha

		CGPROGRAM

#pragma vertex vert
#pragma fragment frag

#pragma target 2.0

#pragma multi_compile _ PIXELSNAP_ON
#pragma multi_compile _ ETC1_EXTERNAL_ALPHA

#include "UnityCG.cginc"

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

	struct v2f
	{
		fixed4 color : COLOR;
		float4 vertex   : SV_POSITION;
		float4 screenPos   : TEXCOORD1;
		float2 texcoord  : TEXCOORD0;
	};

	float _RadiusX;
	float _RadiusY;
	float2 _Center;
	fixed4 _Color;

	v2f vert(appdata_t IN)
	{
		v2f OUT;

		OUT.vertex = UnityObjectToClipPos(IN.vertex);
		OUT.screenPos = ComputeScreenPos(OUT.vertex);
		OUT.texcoord = IN.texcoord;
		OUT.color = IN.color * _Color;

		return OUT;
	}

	sampler2D _MainTex;

	fixed4 SampleSpriteTexture(float2 uv)
	{
		fixed4 color = tex2D(_MainTex, uv);

		return color;
	}

	fixed4 frag(v2f IN) : SV_Target
	{
		fixed4 c = SampleSpriteTexture(IN.texcoord) * IN.color;

		float x = IN.screenPos.x - _Center.x;
		float y = IN.screenPos.y - _Center.y;

		if (abs(x) < _RadiusX && abs(y) < _RadiusY)
		{
			c.a = 0;
		}

		return c;
	}
		ENDCG
	}
	}
}