MirrorTextureNode.cs

using System.Reflection;
using UnityEngine;
using UnityEditor.ShaderGraph;

[Title("Custom", "Mirror Texture Node")]
public class MirrorTextureNode : CodeFunctionNode
{
    public MirrorTextureNode()
    {
        name = "Mirror Texture";
    }
    
    protected override MethodInfo GetFunctionToConvert()
    {
        return GetType().GetMethod("MirrorTextureFunction",
            BindingFlags.Static | BindingFlags.NonPublic);
    }

    static string MirrorTextureFunction(
        [Slot(0, Binding.None)] Boolean mirrorX,
        [Slot(1, Binding.None)] Boolean mirrorY,
        [Slot(2, Binding.MeshUV0)] Vector2 UV,
        [Slot(3, Binding.None)] Texture2D Texture,
        [Slot(4, Binding.None)] SamplerState SS,
        [Slot(5, Binding.None)] out Vector4 RGBA
        )
    {
        RGBA = Vector4.zero;
        return @"
{            
                    float2 mirroredUV = float2(lerp(UV.x, 1.0f - UV.x, mirrorX),lerp(UV.y, 1.0f - UV.y, mirrorY));
                    RGBA = Texture.Sample(SS,mirroredUV);
}
        ";

    }
}