Shader "Map/Multiply" {
	Properties {
		_Color ("Color", Color) = (1, 1, 1, 1)
		_MainTex ("Texture", 2D) = "white" { }
	}
	SubShader {
		Tags {
			"RenderType" = "Transparent"
			"Queue" = "Transparent"
		}
		LOD 100
		
		Blend Zero SrcColor

		Pass {
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag

			#include "UnityCG.cginc"

			struct appdata {
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
				fixed4 color : COLOR0;
			};

			struct v2f {
				float2 uv : TEXCOORD0;
				float4 vertex : SV_POSITION;
				fixed4 color : COLOR0;
			};

			sampler2D _MainTex;
			float4 _MainTex_ST;
			fixed4 _Color;

			v2f vert (appdata v) {
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				o.color = v.color;
				return o;
			}

			fixed4 frag (v2f i) : SV_Target {
				float a = i.color.a * _Color.a;
				fixed4 col = 1 - a * (1 - tex2D(_MainTex, i.uv) * i.color * _Color);
				return col;
			}
			ENDCG
		}
	}
}