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Shader "Test"
{
    Properties{}
    
    CGINCLUDE
    #include "UnityCG.cginc"

    float4 frag(v2f_img i) : SV_Target
    {
        float2 d = distance(float2(0.5, 0.5), i.uv);
        float threshold = abs(sin(_Time.y))*0.5;
        d = step(d, threshold); 
        return d.x;
    }

    ENDCG
    SubShader
    {
        Pass
        {
            CGPROGRAM
            #pragma vertex vert_img
            #pragma fragment frag
            ENDCG
        }
    }
}