How to add Alpha to this Shader?

Hey Guys,

right now I'm working on a gameproject for a Hardware which has limited support for shaders.
The following shaders are supported:
Vertex Shaders, Fragment Shaders (Limited), This Unity version has vertex shader support based on OpenGL ES 2.0.

Unsupported;
Standard Shaders, Surface Shaders, Compute Shaders, Pixel Lighting, HDR Rendering, Linear Rendering, Image Effects

Can someone help me with this shader?
I want to add Alpha for the texture to this shader but I don't know how.
I tried it with "Alpha Cutout" but it isn't supported on the hardware...

Code (CSharp):

1.  
2. Shader "N3DS/DoubleSided/DoubleSided"
3. {
4. Properties
5. {
6.     _MainTex ("Base (RGB)", 2D) = "white" {}
7. }
8.  
9. SubShader
10. {
11.     Tags { "Queue"="Transparent" "RenderType" = "Transparent" }
12.     Cull Off
13.     LOD 80
14.  
15.     // Non-lightmapped
16.     Pass {
17.         Tags { "LightMode" = "Vertex" }
18.         Material
19.         {
20.             Diffuse (1,1,1,1)
21.             Ambient (1,1,1,1)
22.         }
23.         Lighting On
24.         SetTexture [_MainTex] {
25.             constantColor (1,1,1,1)
26.             Combine texture * primary DOUBLE, texture * primary
27.         }
28.     }
29.  
30.     // Lightmapped, encoded as dLDR
31.     Pass
32.      {
33.         Tags { "LightMode" = "VertexLM" }
34.         Cull Off
35.  
36.         BindChannels {
37.             Bind "Vertex", vertex
38.             Bind "normal", normal
39.             Bind "texcoord1", texcoord0 // lightmap uses 2nd uv
40.             Bind "texcoord", texcoord1 // main uses 1st uv
41.         }
42.      
43.         SetTexture [unity_Lightmap] {
44.             matrix [unity_LightmapMatrix]
45.             combine texture
46.         }
47.         SetTexture [_MainTex] {
48.             constantColor (1,1,1,1)
49.             combine texture * previous DOUBLE, texture * primary
50.         }
51.     }
52.  
53.     // Lightmapped, encoded as RGBM
54.     Pass
55.     {
56.         Tags { "LightMode" = "VertexLMRGBM" }
57.         Cull Off
58.  
59.         BindChannels {
60.             Bind "Vertex", vertex
61.             Bind "normal", normal
62.             Bind "texcoord1", texcoord0 // lightmap uses 2nd uv
63.             Bind "texcoord", texcoord1 // main uses 1st uv
64.         }
65.      
66.         SetTexture [unity_Lightmap] {
67.             matrix [unity_LightmapMatrix]
68.             combine texture * texture alpha DOUBLE
69.         }
70.         SetTexture [_MainTex] {
71.             constantColor (1,1,1,1)
72.             combine texture * previous QUAD, texture * primary
73.         }
74.     }
75.  
76.     // Pass to render object as a shadow caster
77.     Pass
78.     {
79.         Name "ShadowCaster"
80.         Tags { "LightMode" = "ShadowCaster" }
81.         Cull Off
82.         ZWrite On ZTest LEqual Cull Off
83.  
84.         CGPROGRAM
85.         #pragma vertex vert
86.         #pragma fragment frag
87.         #pragma multi_compile_shadowcaster
88.         #include "UnityCG.cginc"
89.  
90.         struct v2f {
91.             V2F_SHADOW_CASTER;
92.         };
93.  
94.         v2f vert( appdata_base v )
95.         {
96.             v2f o;
97.             TRANSFER_SHADOW_CASTER_NORMALOFFSET(o)
98.             return o;
99.         }
100.  
101.         float4 frag( v2f i ) : SV_Target
102.         {
103.             SHADOW_CASTER_FRAGMENT(i)
104.         }
105.         ENDCG
106.     }
107. }
108. }
109.  

On Hardware it looks like this:


But it should look like this:

 

/push