Unity URP Shader之灰度化

shader如下：

Shader "TA/Unlit/UI/UIImageGray"
{
    Properties
    {
        _MainTex("Main Texture", 2D) = "white"{}
    }

    SubShader
    {
        Tags
        {
            "Queue" = "Transparent"
            "IgnoreProjector" = "True"
            "RenderType" = "Transparent"
            "RenderPipeline" = "UniversalForward"
        }

        Pass
        {
            Blend SrcAlpha OneMinusSrcAlpha
            Cull Off
            Lighting Off 
            ZWrite Off

            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"

            TEXTURE2D(_MainTex); SAMPLER(sampler_MainTex);
            float4 _MainTex_ST;
            
            struct appdata_t
            {
                float4 vertex : POSITION;
                float2 texcoord : TEXCOORD0;
                half4 color : COLOR;
            };

            struct v2f
            {
                float4 clipPos : POSITION;
                float2 uv : TEXCOORD0;
                half4 color : COLOR;
            };
            

            v2f vert (appdata_t v)
            {
                v2f o;
                o.clipPos = mul(UNITY_MATRIX_MVP, v.vertex);
                o.uv = TRANSFORM_TEX(v.texcoord,_MainTex);
                o.color = v.color;
                return o;
            }
            
            half4 frag (v2f i) : SV_Target
            {
                half4 mainCol = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv);
                half4 col;
                col.rgb = dot(mainCol.rgb, half3(0.222, 0.707, 0.071));
                col.a = mainCol.a;
                col *= i.color;
                return col;
            }
            ENDHLSL
        }
    }

    FallBack Off
}

 

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