Unity a user-friendly UI grayscale shader

Unity A good one UI Grayscale Shader

introduction

stay unity During the development of daily projects , This is often the case , The display button cannot be clicked , The easiest way , Direct will Button Of Interactable Change it to false, however UI The performance is not very good . We can consider remaking a grayscale UI, If there are many demands , You need to make a lot of pictures , At this time, you can consider using gray shader To replace , If you pursue UI Picture quality , It's better to make a new picture .

Shader

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Common/UI/UIGray"
{
	Properties
	{
		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
		_Color("Tint", Color) = (1,1,1,1)

		_StencilComp("Stencil Comparison", Float) = 8
		_Stencil("Stencil ID", Float) = 0
		_StencilOp("Stencil Operation", Float) = 0
		_StencilWriteMask("Stencil Write Mask", Float) = 255
		_StencilReadMask("Stencil Read Mask", Float) = 255

		_ColorMask("Color Mask", Float) = 15

		[Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip("Use Alpha Clip", Float) = 0
		//-------------------add----------------------  
		[Toggle(UNITY_UI_GRAYSCALE)] _UseUIGrayScale("Use Gray Scale", Float) = 1
		//-------------------add----------------------  
	}

		SubShader
	{
		Tags
	{
		"Queue" = "Transparent"
		"IgnoreProjector" = "True"
		"RenderType" = "Transparent"
		"PreviewType" = "Plane"
		"CanUseSpriteAtlas" = "True"
	}

		Stencil
	{
		Ref[_Stencil]
		Comp[_StencilComp]
		Pass[_StencilOp]
		ReadMask[_StencilReadMask]
		WriteMask[_StencilWriteMask]
	}

		Cull Off
		Lighting Off
		ZWrite Off
		ZTest[unity_GUIZTestMode]
		Blend SrcAlpha OneMinusSrcAlpha
		ColorMask[_ColorMask]

		Pass
	{
		CGPROGRAM
#pragma vertex vert  
#pragma fragment frag  

#include "UnityCG.cginc"  
#include "UnityUI.cginc"  

#pragma multi_compile __ UNITY_UI_ALPHACLIP  
		//-------------------add----------------------  
#pragma multi_compile __ UNITY_UI_GRAYSCALE  
		//-------------------add----------------------  

	struct appdata_t
	{
		float4 vertex   : POSITION;
		float4 color    : COLOR;
		float2 texcoord : TEXCOORD0;
	};

	struct v2f
	{
		float4 vertex   : SV_POSITION;
		fixed4 color : COLOR;
		half2 texcoord  : TEXCOORD0;
		float4 worldPosition : TEXCOORD1;
	};

	fixed4 _Color;
	fixed4 _TextureSampleAdd;
	float4 _ClipRect;

	v2f vert(appdata_t IN)
	{
		v2f OUT;
		OUT.worldPosition = IN.vertex;
		OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);

		OUT.texcoord = IN.texcoord;

#ifdef UNITY_HALF_TEXEL_OFFSET  
		OUT.vertex.xy += (_ScreenParams.zw - 1.0)*float2(-1,1);
#endif  

		OUT.color = IN.color * _Color;
		return OUT;
	}

	sampler2D _MainTex;

	fixed4 frag(v2f IN) : SV_Target
	{
		half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;

		color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);

#ifdef UNITY_UI_ALPHACLIP  
		clip(color.a - 0.001);
#endif  
		//-------------------add----------------------  
#ifdef UNITY_UI_GRAYSCALE  
		color.rgb = Luminance(color.rgb);
#endif        
		//-------------------add----------------------  
		return color;
	}
		ENDCG
	}
	}
}

Usage method

1、 Create a Material, Use this shader

2、 take Material Assign to corresponding Image Of Material That's all right. .

If there is a better way , Welcome to discuss .