CRT Shader Android Problem

Hello, I'm testing camera effect from this tutorial http://www.gamasutra.com/blogs/SvyatoslavCherkasov/20140531/218753/Shader_tutorial_CRT_emulation.php. Everything works well on pc, but when I run this on android (OnePlusOne) there are only shades of red

This is my shader code:

Code (CSharp):

1. Shader "Custom/RetroShader"
2. {
3.     Properties
4.     {
5.         _MainTex("Base (RGB)", 2D) = "white" {}
6.     }
7.  
8.         SubShader
9.     {
10.         Pass
11.     {
12.         ZTest Always Cull Off ZWrite Off Fog{ Mode off }
13.  
14.         CGPROGRAM
15.  
16. #pragma vertex vert
17. #pragma fragment frag
18. #pragma fragmentoption ARB_precision_hint_fastest
19. #include "UnityCG.cginc"
20. #pragma target 3.0
21.  
22.     struct v2f
23.     {
24.         float4 pos      : POSITION;
25.         float2 uv       : TEXCOORD0;
26.         float4 scr_pos : TEXCOORD1;
27.     };
28.  
29.     uniform sampler2D _MainTex;
30.  
31.     v2f vert(appdata_img v)
32.     {
33.         v2f o;
34.         o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
35.         o.uv = MultiplyUV(UNITY_MATRIX_TEXTURE0, v.texcoord);
36.         o.scr_pos = ComputeScreenPos(o.pos);
37.         return o;
38.     }
39.  
40.     half4 frag(v2f i) : COLOR
41.     {
42.         half4 color = tex2D(_MainTex, i.uv);
43.  
44.         float2 ps = i.scr_pos.xy *_ScreenParams.xy / i.scr_pos.w;
45.  
46.         int pp = (int)(ps.x) % 3;
47.         float4 outcolor = float4(0, 0, 0, 1);
48.  
49.         if (pp == 0) outcolor.r = color.r;
50.         else if (pp == 1) outcolor.g = color.g;
51.         else if (pp == 2) outcolor.b = color.b;
52.        
53.         return outcolor;
54.     }
55.  
56.         ENDCG
57.     }
58.     }
59.         FallBack "Diffuse"
60. }
61.  

 

I tried to make another simple effect of scanlines every 2 pixels but it doesn't work on android either. This is my code:

Code (CSharp):

1. Shader "Custom/RetroShader"
2. {
3.     Properties
4.     {
5.         _MainTex("Base (RGB)", 2D) = "white" {}
6.     }
7.  
8.         SubShader
9.     {
10.         Pass
11.     {
12.         ZTest Always Cull Off ZWrite Off Fog{ Mode off }
13.  
14.         CGPROGRAM
15.  
16. #pragma vertex vert
17. #pragma fragment frag
18. //#pragma fragmentoption ARB_precision_hint_fastest
19. #include "UnityCG.cginc"
20. //#pragma target 3.0
21.  
22.     struct v2f
23.     {
24.         float4 pos      : POSITION;
25.         float2 uv       : TEXCOORD0;
26.         float4 scr_pos : TEXCOORD1;
27.     };
28.  
29.     uniform sampler2D _MainTex;
30.  
31.     v2f vert(appdata_img v)
32.     {
33.         v2f o;
34.         o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
35.         o.uv = MultiplyUV(UNITY_MATRIX_TEXTURE0, v.texcoord);
36.         o.scr_pos = ComputeScreenPos(o.pos);
37.         return o;
38.     }
39.  
40.     half4 frag(v2f i) : COLOR
41.     {
42.         half4 color = tex2D(_MainTex, i.uv);
43.  
44.         float2 ps = i.scr_pos.xy *_ScreenParams.xy / i.scr_pos.w;
45.  
46.         int yPos = (int)(ps.y);
47.  
48.         if (((yPos / 2) & 1) == 0)
49.         {
50.             color *= 0.5f;
51.         }
52.  
53.         return color;
54.     }
55.  
56.         ENDCG
57.     }
58.     }
59.         FallBack "Diffuse"
60. }

I completely don't know what's wrong :/ It works perfectly on pc.