//----------------------------------------------------------------------------------------------------------
// X-PostProcessing Library
// https://github.com/QianMo/X-PostProcessing-Library
// Copyright (C) 2020 QianMo. All rights reserved.
// Licensed under the MIT License 
// You may not use this file except in compliance with the License.You may obtain a copy of the License at
// http://opensource.org/licenses/MIT
//----------------------------------------------------------------------------------------------------------

Shader "Hidden/X-PostProcessing/SharpenV2"
{
	HLSLINCLUDE

#include "../../../Shaders/StdLib.hlsl"
#include "../../../Shaders/XPostProcessing.hlsl"

	uniform half _Sharpness;

	half4 Frag(VaryingsDefault i) : SV_Target
	{

		half2 pixelSize = float2(1 / _ScreenParams.x, 1 / _ScreenParams.y);
		pixelSize *= 1.5f;

		half4 blur = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord + half2(pixelSize.x, -pixelSize.y));
		blur += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord + half2(-pixelSize.x, -pixelSize.y));
		blur += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord + half2(pixelSize.x, pixelSize.y));
		blur += SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord + half2(-pixelSize.x, pixelSize.y));
		blur *= 0.25;


		half4 sceneColor = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord);

		return sceneColor + (sceneColor - blur) * _Sharpness;
	}

		ENDHLSL

		SubShader
	{
		Cull Off ZWrite Off ZTest Always

			Pass
		{
			HLSLPROGRAM

			#pragma vertex VertDefault
			#pragma fragment Frag

			ENDHLSL

		}
	}
}