Shader "Hidden/NewImageEffectShader"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
		_EffectScaler ("Effect Scaler", float) = 0
		_EffectLerp ("Effect Lerp", float) = 0
	}
	SubShader
	{
		// No culling or depth
		Cull Off ZWrite Off 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;
				float4 scrPos:TEXCOORD1;
			};

			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
				o.uv = v.uv;
				o.scrPos = ComputeScreenPos(o.vertex);
				return o;
			}

			sampler2D _MainTex;
			uniform half4 _MainTex_TexelSize;
			sampler2D _CameraDepthTexture;
			float _EffectScaler;
			float _EffectLerp;

			fixed4 frag (v2f i) : SV_Target
			{
				// pixel to uv ratios
				float pr_x = 1 / _MainTex_TexelSize.x;
				float pr_y = 1 / _MainTex_TexelSize.y;

				fixed4 col = tex2D(_MainTex, i.uv);
				fixed4 ogCol = col;

				float ogColPowerScaler = ogCol.x;//length(ogCol);
				float depth = pow(1 - Linear01Depth(SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv)), 10);

				float2 offsetCoord_1 = float2(i.uv.x + frac(i.uv.y/7) * _EffectScaler  * ogColPowerScaler, i.uv.y);
				float2 offsetCoord_2 = float2(i.uv.x - frac(i.uv.y / 7) * _EffectScaler  * ogColPowerScaler, i.uv.y);

				fixed4 samp_1 = tex2D(_MainTex,  offsetCoord_1);
				fixed4 samp_2 = tex2D(_MainTex,  offsetCoord_2);

				fixed4 effectCol_1 = (depth *ogCol + samp_1 + samp_2) /3;

				//col = pow( 1- Linear01Depth(tex2D(_CameraDepthTexture, i.uv)), 100 );

				//float depth = 1- pow( Linear01Depth(tex2Dproj(_CameraDepthTexture, UNITY_PROJ_COORD(i.scrPos)).r), 1) ;


				col = lerp(ogCol, effectCol_1, _EffectLerp );

				//col = fixed4(depth,depth,depth,1);

				//col = abs(col - brightness);
				// just invert the colors
				//col = 1 - col;
				return col;
			}
			ENDCG
		}
	}
}