/*
           ██████╗░██╗░░░░░██╗░░░██╗██████╗░  ░██████╗██╗░░██╗░█████╗░██████╗░███████╗██████╗░
           ██╔══██╗██║░░░░░██║░░░██║██╔══██╗  ██╔════╝██║░░██║██╔══██╗██╔══██╗██╔════╝██╔══██╗
           ██████╦╝██║░░░░░██║░░░██║██████╔╝  ╚█████╗░███████║███████║██║░░██║█████╗░░██████╔╝
           ██╔══██╗██║░░░░░██║░░░██║██╔══██╗  ░╚═══██╗██╔══██║██╔══██║██║░░██║██╔══╝░░██╔══██╗
           ██████╦╝███████╗╚██████╔╝██║░░██║  ██████╔╝██║░░██║██║░░██║██████╔╝███████╗██║░░██║
           ╚═════╝░╚══════╝░╚═════╝░╚═╝░░╚═╝  ╚═════╝░╚═╝░░╚═╝╚═╝░░╚═╝╚═════╝░╚══════╝╚═╝░░╚═╝
            
                █▀▀▄ █──█ 　 ▀▀█▀▀ █──█ █▀▀ 　 ░█▀▀▄ █▀▀ ▀█─█▀ █▀▀ █── █▀▀█ █▀▀█ █▀▀ █▀▀█ 
                █▀▀▄ █▄▄█ 　 ─░█── █▀▀█ █▀▀ 　 ░█─░█ █▀▀ ─█▄█─ █▀▀ █── █──█ █──█ █▀▀ █▄▄▀ 
                ▀▀▀─ ▄▄▄█ 　 ─░█── ▀──▀ ▀▀▀ 　 ░█▄▄▀ ▀▀▀ ──▀── ▀▀▀ ▀▀▀ ▀▀▀▀ █▀▀▀ ▀▀▀ ▀─▀▀
____________________________________________________________________________________________________________________________________________

        ▄▀█ █▀ █▀ █▀▀ ▀█▀ ▀   █░█ █░░ ▀█▀ █ █▀▄▀█ ▄▀█ ▀█▀ █▀▀   ▄█ █▀█ ▄█▄   █▀ █░█ ▄▀█ █▀▄ █▀▀ █▀█ █▀
        █▀█ ▄█ ▄█ ██▄ ░█░ ▄   █▄█ █▄▄ ░█░ █ █░▀░█ █▀█ ░█░ ██▄   ░█ █▄█ ░▀░   ▄█ █▀█ █▀█ █▄▀ ██▄ █▀▄ ▄█
____________________________________________________________________________________________________________________________________________
License:
    The license is ATTRIBUTION 3.0

    More license info here:
        https://creativecommons.org/licenses/by/3.0/
____________________________________________________________________________________________________________________________________________
This shader has NOT been tested on any other PC configuration except the following:
    CPU: Intel Core i5-6400
    GPU: NVidia GTX 750Ti
    RAM: 16GB
    Windows: 10 x64
    DirectX: 11
____________________________________________________________________________________________________________________________________________
*/

Shader "Ultimate 10+ Shaders/Blur"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _BlurAmount ("Blur Amount", Range(0, 0.03)) = 0.0128
    }
    SubShader
    {
        Tags { "Queue"="Transparent" }
        Cull Back
        ZTest Always

        GrabPass { }

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
            };    

            struct v2f
            {
                float4 position : POSITION;
                float4 screenPos : TEXCOORD0;
            };

            half _BlurAmount;
            fixed4 _Color;
            sampler2D _GrabTexture : register(s0);

            v2f vert(appdata input)
            {
                v2f output;

                output.position = UnityObjectToClipPos(input.vertex);
                output.screenPos = output.position;

                return output;
            }

            half4 pixel;
            half2 uv;
            fixed i = 0;
            half iBlur;
            half4 frag(v2f input) : SV_Target
            {    
                uv = input.screenPos.xy / input.screenPos.w;
                uv.x = (uv.x + 1) * .5;
                uv.y = 1.0 - (uv.y + 1) * .5;

                pixel = 0;

                pixel += tex2D(_GrabTexture, half2(uv.x + 1.5 * _BlurAmount, uv.y + 0.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x + 1.5 * _BlurAmount, uv.y - 0.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x + 1.5 * _BlurAmount, uv.y - 1.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x + 1.5 * _BlurAmount, uv.y - 2.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x + 0.5 * _BlurAmount, uv.y + 2.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x + 0.5 * _BlurAmount, uv.y + 1.5 * _BlurAmount));

                pixel += tex2D(_GrabTexture, half2(uv.x + 0.5 * _BlurAmount, uv.y + 0.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x + 0.5 * _BlurAmount, uv.y - 0.5 * _BlurAmount));

                pixel += tex2D(_GrabTexture, half2(uv.x + 0.5 * _BlurAmount, uv.y - 1.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x + 0.5 * _BlurAmount, uv.y - 2.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x - 0.5 * _BlurAmount, uv.y + 2.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x - 0.5 * _BlurAmount, uv.y + 1.5 * _BlurAmount));
                
                pixel += tex2D(_GrabTexture, half2(uv.x - 0.5 * _BlurAmount, uv.y + 0.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x - 0.5 * _BlurAmount, uv.y - 0.5 * _BlurAmount));

                pixel += tex2D(_GrabTexture, half2(uv.x - 0.5 * _BlurAmount, uv.y - 1.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x - 0.5 * _BlurAmount, uv.y - 2.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x - 1.5 * _BlurAmount, uv.y + 2.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x - 1.5 * _BlurAmount, uv.y + 1.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x - 1.5 * _BlurAmount, uv.y + 0.5 * _BlurAmount));
                pixel += tex2D(_GrabTexture, half2(uv.x - 1.5 * _BlurAmount, uv.y - 0.5 * _BlurAmount));

				pixel += tex2D(_GrabTexture, half2(uv.x, uv.y));

                return (pixel / 20.0) * _Color;
            }
            ENDCG
        }
    }
}