aswi2021tri-musketyri-gitlab/Client/WebGLResponsiveTest/Assets/Scripts/Grayscale.shader @ master

Shader "Unlit/Grayscale"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Min("Min", Range(0.0, 1.0)) = 0.0
        _Max("Max", Range(0.0, 1.0)) = 0.25
        _Color("Color", Color) = (0,0,0,0)

    }
    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;
            float _Min;
            float _Max;
            float4 _Color;

            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 frag (v2f i) : SV_Target
            {
                // sample the texture
                fixed4 col = tex2D(_MainTex, i.uv);
                float bw = (0.3f * col.r) + (0.59f * col.g) + (0.11f * col.b);
                bw *= col.a;

                float res = _Min + (_Max - _Min) * bw;

                return 1 - fixed4(res, res, res, 1);
            }
            ENDCG
        }
    }
}