Shader "Unlit/NewUnlitShader"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            // make fog work
            #pragma multi_compile_fog

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                UNITY_FOG_COORDS(1)
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }

            fixed4 blur(float2 uv, sampler2D tex, float blurAmount, int iterations)
            {
                fixed4 color = tex2D(tex, uv);
                fixed2 offsets[4] = { float2(-blurAmount, 0), float2(blurAmount, 0), float2(0, -blurAmount), float2(0, blurAmount) };
                for (int iter = 0; iter < iterations; iter++)
                {
                    for (int i = 0; i < 4; i++)
                    {
                        color += tex2D(tex, uv + offsets[i] * (iter + 1));
                    }
                }
                return color / (1.0 + 4.0 * iterations);
            }

            fixed luminance(fixed4 color) {
                return  0.2125 * color.r + 0.7154 * color.g + 0.0721 * color.b; 
            }
            fixed4 bloom(fixed4 col, float threshold, float intensity)
            {
                // fixed4 col = tex2D(tex, uv);
                fixed lum = luminance(col);
                fixed val = clamp(lum - threshold, 0.0, 1.0);

                return col * (val * intensity); // Apply bloom effect by multiplying color with intensity
                // }
            }
           
            float2 fisheyeWarp(float2 uv, float strength)
            {
                float2 center = float2(0.5, 0.5);
                float2 delta = uv - center;
                float dist = length(delta);
                float theta = atan2(delta.y, delta.x);
                float warpedDist = pow(dist, strength);
                float2 warpedDelta = float2(cos(theta), sin(theta)) * warpedDist;
                return center + warpedDelta;
            }


            fixed4 frag (v2f i) : SV_Target
            {
                // sample the texture
                v2f o;
                o.uv = fisheyeWarp(i.uv, 1.1); // Apply fisheye warp effect
            

                fixed4 col_raw = tex2D(_MainTex, o.uv);
                fixed4 col_blur = blur(o.uv, _MainTex, 0.01, 2); // Apply blur with a small amount
                fixed4 col_bloom = bloom(col_blur, 0.25, 5.0); // Apply bloom with threshold and intensity
                fixed4 col = col_raw+col_blur * col_bloom; // Combine raw color with blurred and bloom effects

                // apply fog
                UNITY_APPLY_FOG(i.fogCoord, col);
                return col;
            }
            ENDCG
        }
    }
}