Shader "MyShaders/OldFilmEffectShader"  
 {  
    Properties   
    {  
        _MainTex ("Base (RGB)", 2D) = "white" {}  
        _VignetteTex ("Vignette Texture", 2D) = "white"{}  
        _ScratchesTex ("Scartches Texture", 2D) = "white"{}  
        _DustTex ("Dust Texture", 2D) = "white"{}  
        _SepiaColor ("Sepia Color", Color) = (1,1,1,1)  
        _EffectAmount ("Old Film Effect Amount", Range(0,1)) = 1.0  
        _VignetteAmount ("Vignette Opacity", Range(0,1)) = 1.0  
        _ScratchesYSpeed ("Scratches Y Speed", Float) = 10.0  
        _ScratchesXSpeed ("Scratches X Speed", Float) = 10.0  
        _dustXSpeed ("Dust X Speed", Float) = 10.0  
        _dustYSpeed ("Dust Y Speed", Float) = 10.0  
        _RandomValue ("Random Value", Float) = 1.0  
        _Contrast ("Contrast", Float) = 3.0  
          
        _distortion ("Distortion", Float) = 0.2  
        _cubicDistortion ("Cubic Distortion", Float) = 0.6  
        _scale ("Scale (Zoom)", Float) = 0.8  
    }  
      
    SubShader   
    {  
        Pass  
        {  
            CGPROGRAM  
            #pragma vertex vert_img  
            #pragma fragment frag  
            #pragma fragmentoption ARB_precision_hint_fastest  
            #include "UnityCG.cginc"  
              
            uniform sampler2D _MainTex;  
            uniform sampler2D _VignetteTex;  
            uniform sampler2D _ScratchesTex;  
            uniform sampler2D _DustTex;  
            fixed4 _SepiaColor;  
            fixed _VignetteAmount;  
            fixed _ScratchesYSpeed;  
            fixed _ScratchesXSpeed;  
            fixed _dustXSpeed;  
            fixed _dustYSpeed;  
            fixed _EffectAmount;  
            fixed _RandomValue;  
            fixed _Contrast;  
              
            float _distortion;  
            float _cubicDistortion;  
            float _scale;  
  
            float2 barrelDistortion(float2 coord)   
            {  
  
                float2 h = coord.xy - float2(0.5, 0.5);  
                float r2 = h.x * h.x + h.y * h.y;  
                float f = 1.0 + r2 * (_distortion + _cubicDistortion * sqrt(r2));  
  
                return f * _scale * h + 0.5;  
            }  
  
            fixed4 frag(v2f_img i) : COLOR  
            {  
                //Get the colors from the RenderTexture and the uv's  
                //from the v2f_img struct  
                half2 distortedUV = barrelDistortion(i.uv);  
                distortedUV = half2(i.uv.x, i.uv.y + (_RandomValue * _SinTime.z * 0.005));  
                fixed4 renderTex = tex2D(_MainTex, i.uv);  
                  
                //Get the pixels from the Vignette Texture  
                fixed4 vignetteTex = tex2D(_VignetteTex, i.uv);  
                  
                //Process the Scratches UV and pixels  
                half2 scratchesUV = half2(i.uv.x + (_RandomValue * _SinTime.z * _ScratchesXSpeed),  
                                         i.uv.y + (_Time.x * _ScratchesYSpeed));  
                fixed4 scratchesTex = tex2D(_ScratchesTex, scratchesUV);  
                  
                //Process the Dust UV and pixels  
                half2 dustUV = half2(i.uv.x + (_RandomValue * (_SinTime.z * _dustXSpeed)),   
                                    i.uv.y + (_RandomValue * (_SinTime.z * _dustYSpeed)));  
                fixed4 dustTex = tex2D(_DustTex, dustUV);  
                  
                // get the luminosity values from the render texture using the YIQ values.  
                fixed lum = dot (fixed3(0.299, 0.587, 0.114), renderTex.rgb);  
  
                  
                //Add the constant color to the lum values  
                fixed4 finalColor = lum + lerp(_SepiaColor, _SepiaColor +  
                                                fixed4(0.1f,0.1f,0.1f,1.0f), _RandomValue);  
                finalColor = pow(finalColor, _Contrast);  
                  
                //Create a constant white color we can use to adjust opacity of effects  
                fixed3 constantWhite = fixed3(1,1,1);  
                  
                //Composite together the different layers to create finsl Screen Effect  
                finalColor = lerp(finalColor, finalColor * vignetteTex, _VignetteAmount);  
                finalColor.rgb *= lerp(scratchesTex, constantWhite, (_RandomValue));  
                finalColor.rgb *= lerp(dustTex.rgb, constantWhite, (_RandomValue * _SinTime.z));  
                finalColor = lerp(renderTex, finalColor, _EffectAmount);  
                  
                return finalColor;  
            }  
      
            ENDCG  
        }  
    }   
    FallBack off  
}