Shader "Custom/GrayCamera" {
    Properties {
        _MainTex ("Base (RGB)", 2D) = "white" {}
        _LuminosityAmount ("GrayScale Amount", Range(0.0, 1.0)) = 1.0
    }
    SubShader {
        Pass {
            CGPROGRAM
            #pragma vertex vert_img
			#pragma fragment frag
			#pragma fragmentoption ARB_precision_hint_fastest
            #include "UnityCG.cginc"
            
            uniform sampler2D _MainTex;
            fixed _LuminosityAmount;
            
            fixed4 frag(v2f_img i) : COLOR
            {
                fixed4 renderTex = tex2D(_MainTex, i.uv);
                
                float luminosity = 0.299 * renderTex.r + 0.587 * renderTex.g + 0.114 * renderTex.b;
                fixed4 finalColor = lerp(renderTex, luminosity, _LuminosityAmount);
                
                return finalColor;
            }
            
            ENDCG
        }
    }
    //FallBack "Diffuse"
}