Shader "SupGames/Shaders/Sharpen"
{
	Properties
	{
		_MainTex("Base (RGB)", 2D) = "" {}
	}

	CGINCLUDE

#include "UnityCG.cginc"

	struct appdata {
		half4 pos : POSITION;
		half2 uv  : TEXCOORD0;
	};
	struct v2f
	{
		half4 pos : SV_POSITION;
		half2 uv  : TEXCOORD0;
		half4 uv1  : TEXCOORD1;
	};

	uniform sampler2D _MainTex;
	uniform half _CentralFactor;
	uniform half _SideFactor;
	uniform half4 _MainTex_TexelSize;

	v2f vert(appdata v)
	{
		v2f o;
		o.pos = UnityObjectToClipPos(v.pos);
		o.uv = v.uv;
		o.uv1 = half4(v.uv - _MainTex_TexelSize.xy, v.uv + _MainTex_TexelSize.xy);
		return o;
	}

	half4 frag(v2f i) : SV_Target
	{
		half4 c = tex2D(_MainTex, i.uv) * _CentralFactor;
		c -= tex2D(_MainTex, i.uv1.xy) * _SideFactor;
		c -= tex2D(_MainTex, i.uv1.xw) * _SideFactor;
		c -= tex2D(_MainTex, i.uv1.zy) * _SideFactor;
		c -= tex2D(_MainTex, i.uv1.zw) * _SideFactor;
		return c;
	}

	ENDCG

	Subshader
	{
		Pass
		{
			ZTest Always Cull Off ZWrite Off
			Fog { Mode off }
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma fragmentoption ARB_precision_hint_fastest
			ENDCG
		}
	}

	Fallback off
}