garden_client/Assets/Resources/Shader/Gray.shader

Shader "DashGame/Gray"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
	}

	SubShader
	{
		Tags { "Queue"="Overlay" }

		Pass
		{
			Blend SrcAlpha OneMinusSrcAlpha

			CGPROGRAM

			#pragma vertex vert
			#pragma fragment frag
			
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				float4 vertex : SV_POSITION;
			};

			sampler2D _MainTex;
			float4 _MainTex_ST;
			
			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				fixed4 col = tex2D(_MainTex, i.uv);

				fixed gray = dot(col.rgb, fixed3(0.299, 0.587, 0.114));

				col.rgb = fixed3(gray, gray, gray);
				return col;
			}
			ENDCG
		}
	}
}