Question Edit shader

Good afternoon.
I would like help to edit this shader.
https://github.com/keijiro/KinoStreak

Code (CSharp):

1.  
2. // Kino/Streak - Anamorphic lens flare effect for Unity
3. // https://github.com/keijiro/KinoStreak
4.  
5. #include "UnityCG.cginc"
6.  
7. sampler2D _MainTex;
8. float4 _MainTex_TexelSize;
9.  
10. sampler2D _HighTex;
11. float4 _HighTex_TexelSize;
12.  
13. float _Threshold;
14. float _Stretch;
15. float _Intensity;
16. half3 _Color;
17.  
18. // Prefilter: Shrink horizontally and apply threshold.
19. half4 frag_prefilter(v2f_img i) : SV_Target
20. {
21.     // Actually this should be 1, but we assume you need more blur...
22.     const float vscale = 1.5;
23.     const float dy = _MainTex_TexelSize.y * vscale / 2;
24.  
25.     half3 c0 = tex2D(_MainTex, float2(i.uv.x, i.uv.y - dy));
26.     half3 c1 = tex2D(_MainTex, float2(i.uv.x, i.uv.y + dy));
27.     half3 c = (c0 + c1) / 2;
28.  
29.     float br = max(c.r, max(c.g, c.b));
30.     c *= max(0, br - _Threshold) / max(br, 1e-5);
31.  
32.     return half4(c, 1);
33. }
34.  
35. // Downsampler
36. half4 frag_down(v2f_img i) : SV_Target
37. {
38.     // Actually this should be 1, but we assume you need more blur...
39.     const float hscale = 1.25;
40.     const float dx = _MainTex_TexelSize.x * hscale;
41.  
42.     float u0 = i.uv.x - dx * 5;
43.     float u1 = i.uv.x - dx * 3;
44.     float u2 = i.uv.x - dx * 1;
45.     float u3 = i.uv.x + dx * 1;
46.     float u4 = i.uv.x + dx * 3;
47.     float u5 = i.uv.x + dx * 5;
48.  
49.     half3 c0 = tex2D(_MainTex, float2(u0, i.uv.y));
50.     half3 c1 = tex2D(_MainTex, float2(u1, i.uv.y));
51.     half3 c2 = tex2D(_MainTex, float2(u2, i.uv.y));
52.     half3 c3 = tex2D(_MainTex, float2(u3, i.uv.y));
53.     half3 c4 = tex2D(_MainTex, float2(u4, i.uv.y));
54.     half3 c5 = tex2D(_MainTex, float2(u5, i.uv.y));
55.  
56.     // Simple box filter
57.     half3 c = (c0 + c1 + c2 + c3 + c4 + c5) / 6;
58.  
59.     return half4(c, 1);
60. }
61.  
62. // Upsampler
63. half4 frag_up(v2f_img i) : SV_Target
64. {
65.     half3 c0 = tex2D(_MainTex, i.uv) / 4;
66.     half3 c1 = tex2D(_MainTex, i.uv) / 2;
67.     half3 c2 = tex2D(_MainTex, i.uv) / 4;
68.     half3 c3 = tex2D(_HighTex, i.uv);
69.     return half4(lerp(c3, c0 + c1 + c2, _Stretch), 1);
70. }
71.  
72. // Final composition
73. half4 frag_composite(v2f_img i) : SV_Target
74. {
75.     half3 c0 = tex2D(_MainTex, i.uv) / 4;
76.     half3 c1 = tex2D(_MainTex, i.uv) / 2;
77.     half3 c2 = tex2D(_MainTex, i.uv) / 4;
78.     half3 c3 = tex2D(_HighTex, i.uv);
79.     half3 cf = (c0 + c1 + c2) * _Color * _Intensity * 5;
80.     return half4(cf + c3, 1);
81. }
82.  

I would like to take this rays (Anamorphic Flare) and duplicate them on the Y axis.
Something like:


Or create angles between them and do something like this:


I tried to do it by publishing the terms and putting the uv * -1, but it didn't work.

Is there a way to put all this code in just one Pass?
Credits: https://github.com/keijiro