【Unity】２枚のテクスチャを重ねるシェーダー

DecalCustom.shader

Shader "Unlit/DecalCustom"
{
	Properties
	{
		_MainTex ("MainTex", 2D) = "white" {}
		_SubTex("SubTex",2D)="white"{}
	}
	SubShader
	{
		Tags { "RenderType"="Opaque"
		"Queue" = "Transparent" }
		LOD 100

		Pass
		{
			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;
			sampler2D _SubTex;
			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 mcol = tex2D(_MainTex, i.uv);		
				fixed4 scol = tex2D(_SubTex,i.uv);
				fixed3 col = lerp(mcol.rgb,scol.rgb,scol.a);
				clip(mcol.a - 0.5);
				return fixed4(col.r,col.g,col.b,mcol.a);
			}
			ENDCG
		}
	}
}