//----------------------------------------------------------------------------------------------------------
// 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/Glitch/WaveJitter"
{
	HLSLINCLUDE
	
	#include "../../../Shaders/XPostProcessing.hlsl"
	#include "../../../Shaders/XNoiseLibrary.hlsl"
	
	#pragma shader_feature USING_FREQUENCY_INFINITE

	uniform half4 _Params;
	half2 _Resolution;

	#define _Frequency _Params.x
	#define _RGBSplit _Params.y
	#define _Speed _Params.z
	#define _Amount _Params.w

	
	float4 Frag_Horizontal(VaryingsDefault i): SV_Target
	{
		half strength = 0.0;
		#if USING_FREQUENCY_INFINITE
			strength = 1;
		#else
			strength = 0.5 + 0.5 *cos(_Time.y * _Frequency);
		#endif
		
		// Prepare UV
		float uv_y = i.texcoord.y * _Resolution.y;
		float noise_wave_1 = snoise(float2(uv_y * 0.01, _Time.y * _Speed * 20)) * (strength * _Amount * 32.0);
		float noise_wave_2 = snoise(float2(uv_y * 0.02, _Time.y * _Speed * 10)) * (strength * _Amount * 4.0);
		float noise_wave_x = noise_wave_1 * noise_wave_2 / _Resolution.x;
		float uv_x = i.texcoord.x + noise_wave_x;

		float rgbSplit_uv_x = (_RGBSplit * 50 + (20.0 * strength + 1.0)) * noise_wave_x / _Resolution.x;

		// Sample RGB Color-
		half4 colorG = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, float2(uv_x, i.texcoord.y));
		half4 colorRB = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, float2(uv_x + rgbSplit_uv_x, i.texcoord.y));
		
		return  half4(colorRB.r, colorG.g, colorRB.b, colorRB.a + colorG.a);
	}

	float4 Frag_Vertical(VaryingsDefault i) : SV_Target
	{
		half strength = 0.0;
		#if USING_FREQUENCY_INFINITE
			strength = 1;
		#else
			strength = 0.5 + 0.5 * cos(_Time.y * _Frequency);
		#endif

		// Prepare UV
		float uv_x = i.texcoord.x * _Resolution.x;
		float noise_wave_1 = snoise(float2(uv_x * 0.01, _Time.y * _Speed * 20)) * (strength * _Amount * 32.0);
		float noise_wave_2 = snoise(float2(uv_x * 0.02, _Time.y * _Speed * 10)) * (strength * _Amount * 4.0);
		float noise_wave_y = noise_wave_1 * noise_wave_2 / _Resolution.x;
		float uv_y = i.texcoord.y + noise_wave_y;

		float rgbSplit_uv_y = (_RGBSplit * 50 + (20.0 * strength + 1.0)) * noise_wave_y / _Resolution.y;

		// Sample RGB Color
		half4 colorG = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, float2(i.texcoord.x, uv_y));
		half4 colorRB = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, float2(i.texcoord.x, uv_y + rgbSplit_uv_y));

		return half4(colorRB.r, colorG.g, colorRB.b, colorRB.a + colorG.a);
	}
	
	ENDHLSL
	
	SubShader
	{
		Cull Off ZWrite Off ZTest Always

		Pass
		{
			HLSLPROGRAM

			#pragma vertex VertDefault
			#pragma fragment Frag_Horizontal

			ENDHLSL

		}

		Pass
		{
			HLSLPROGRAM
			
			#pragma vertex VertDefault
			#pragma fragment Frag_Vertical
			
			ENDHLSL
			
		}
	}
}