A shader that cuts a texture from a texture

Hi!
I need to make a shader that cuts a texture from a texture
Below is a picture of how I need it to be as a result:

I have a shader blank, but I do not know in which direction I should move next:

Code (Boo):

1.  
2. Shader "KJPiGames/GlassImortalShader"
3. {
4.      Properties
5.     {
6.         _Color ("Color", Color) = (1,1,1,1)
7.         _MainTex ("Broken Glass", 2D) = "white" {}
8.         _HoleTex ("Hole Texture", 2D) = "white" {}
9.     }
10.  
11.  
12.     SubShader
13.     {
14.         Tags { "RenderType"="Opaque" }
15.         LOD 250
16.         CGPROGRAM
17.  
18.         #pragma surface surf Lambert
19.         fixed4 _Color;
20.         sampler2D _MainTex;
21.         sampler2D _HoleTex;
22.         struct Input
23.         {
24.             float2 uv_MainTex;
25.             float2 uv_HoleTex;
26.         };
27.  
28.         void surf (Input IN, inout SurfaceOutput o)
29.         {
30.             fixed4 base = tex2D(_MainTex, IN.uv_MainTex);
31.             fixed4 two = tex2D(_HoleTex, IN.uv_HoleTex);
32.  
33.             two *= _Color;
34.             base.rgb = base.rgb * base.a + two.rgb * (1 - base.a);
35.             o.Albedo = base.rgb;
36.             o.Alpha = _Color.a;
37.         }
38.  
39.         ENDCG
40.  
41.     }
42.     FallBack "Diffuse"
43. }
44.  

 

change line 36 to

Code (CSharp):

1.  
2. o.Alpha = two.r;
3.  

That should use the red channel from your hole texture as the alpha.

 

It didn't help

 

Okay, I did, who needs to take it

Code (Boo):

1. Shader "KJPiGames/GlassImortalShader"
2. {
3.     Properties{
4.         _MainTex("Albedo (RGB)", 2D) = "white" {}
5.         _MaskTex("Mask", 2D) = "white" {}
6.     }
7.         SubShader{
8.             Tags { "RenderType" = "Opaque" "Queue" = "Transparent"}
9.             Blend SrcAlpha OneMinusSrcAlpha
10.             CGPROGRAM
11.             #pragma surface surf Standard keepalpha
12.             #pragma target 3.0
13.             sampler2D _MainTex;
14.             sampler2D _MaskTex;
15.             struct Input {
16.                 float2 uv_MainTex;
17.             };
18.             void surf(Input IN, inout SurfaceOutputStandard o) {
19.                 fixed4 c = tex2D(_MainTex, IN.uv_MainTex);
20.                 fixed4 m = tex2D(_MaskTex, IN.uv_MainTex);
21.                 c = c * m.r;
22.                 o.Albedo = c.rgb;
23.                 o.Alpha = c.a;
24.             }
25.             ENDCG
26.     }
27.  
28.     FallBack "Diffuse"
29. }