SHADER 灰阶公式快捷使用

Basic

Example

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 Shader "Unlit/NewUnlitShader"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
		_DesatValue("DesatValue",Range(0,1)) = 0.5
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 100

		CGPROGRAM
		#pragma surface surf Lambert
		
		sampler2D _MainTex;
		fixed _DesatValue;

		struct Input
		{
			float2 uv_MainTex;
		};

		void surf(Input IN,inout SurfaceOutput o)
		{
			float4 c = tex2D(_MainTex,IN.uv_MainTex);
			c.rgb = lerp(c.rgb,Luminance(c.rgb),_DesatValue);
			o.Albedo = c.rgb;
			o.Alpha = c.a;
		}


		ENDCG
	}
}

参数详情

1.Luminance
简单的说Luminance就是实现灰阶公式的函数。位于UnityCG.glslinc

具体实现如下

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 // Converts color to luminance (grayscale)
float Luminance( vec3 c )
{
	return dot( c, vec3(0.22, 0.707, 0.071) );
}

WARNING

1.能用函数尽量用函数，自己也可以将自定义的函数封装到.cginc文件中。