CRT Shader Android Problem

Graphics Shaders & Materials
1

Hello, I’m testing camera effect from this tutorial Game Platforms recent news | Game Developer. Everything works well on pc, but when I run this on android (OnePlusOne) there are only shades of red :frowning:

This is my shader code:

Shader "Custom/RetroShader"
{
    Properties
    {
        _MainTex("Base (RGB)", 2D) = "white" {}
    }

        SubShader
    {
        Pass
    {
        ZTest Always Cull Off ZWrite Off Fog{ Mode off }

        CGPROGRAM

#pragma vertex vert
#pragma fragment frag
#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"
#pragma target 3.0

    struct v2f
    {
        float4 pos      : POSITION;
        float2 uv       : TEXCOORD0;
        float4 scr_pos : TEXCOORD1;
    };

    uniform sampler2D _MainTex;

    v2f vert(appdata_img v)
    {
        v2f o;
        o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
        o.uv = MultiplyUV(UNITY_MATRIX_TEXTURE0, v.texcoord);
        o.scr_pos = ComputeScreenPos(o.pos);
        return o;
    }

    half4 frag(v2f i) : COLOR
    {
        half4 color = tex2D(_MainTex, i.uv);

        float2 ps = i.scr_pos.xy *_ScreenParams.xy / i.scr_pos.w;

        int pp = (int)(ps.x) % 3;
        float4 outcolor = float4(0, 0, 0, 1);

        if (pp == 0) outcolor.r = color.r;
        else if (pp == 1) outcolor.g = color.g;
        else if (pp == 2) outcolor.b = color.b;
       
        return outcolor;
    }

        ENDCG
    }
    }
        FallBack "Diffuse"
}
2

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

Shader "Custom/RetroShader"
{
    Properties
    {
        _MainTex("Base (RGB)", 2D) = "white" {}
    }

        SubShader
    {
        Pass
    {
        ZTest Always Cull Off ZWrite Off Fog{ Mode off }

        CGPROGRAM

#pragma vertex vert
#pragma fragment frag
//#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"
//#pragma target 3.0

    struct v2f
    {
        float4 pos      : POSITION;
        float2 uv       : TEXCOORD0;
        float4 scr_pos : TEXCOORD1;
    };

    uniform sampler2D _MainTex;

    v2f vert(appdata_img v)
    {
        v2f o;
        o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
        o.uv = MultiplyUV(UNITY_MATRIX_TEXTURE0, v.texcoord);
        o.scr_pos = ComputeScreenPos(o.pos);
        return o;
    }

    half4 frag(v2f i) : COLOR
    {
        half4 color = tex2D(_MainTex, i.uv);

        float2 ps = i.scr_pos.xy *_ScreenParams.xy / i.scr_pos.w;

        int yPos = (int)(ps.y);

        if (((yPos / 2) & 1) == 0)
        {
            color *= 0.5f;
        }

        return color;
    }

        ENDCG
    }
    }
        FallBack "Diffuse"
}

I completely don’t know what’s wrong :confused: It works perfectly on pc.