ScriptableRenderPipeline/com.unity.shadergraph/Editor/Data/Graphs/Vector2ShaderProperty.cs

using System;
using UnityEditor.Graphing;
using UnityEngine;

namespace UnityEditor.ShaderGraph
{
    [Serializable]
    public class Vector2ShaderProperty : VectorShaderProperty
    {
        public Vector2ShaderProperty()
        {
            displayName = "Vector2";
        }

        public override PropertyType propertyType
        {
            get { return PropertyType.Vector2; }
        }

        public override Vector4 defaultValue
        {
            get { return new Vector4(value.x, value.y, 0, 0); }
        }
       
        public override string GetPropertyDeclarationString(string delimiter = ";")
        {
            return string.Format("float2 {0}{1}", referenceName, delimiter);
        }

        public override PreviewProperty GetPreviewMaterialProperty()
        {
            return new PreviewProperty(PropertyType.Vector2)
            {
                name = referenceName,
                vector4Value = value
            };
        }

        public override INode ToConcreteNode()
        {
            return new Vector2Node { value = value };
        }
    }
}