Add text field on properties to allow a custom reference name

com.unity.shadergraph/Editor/Data/Graphs/AbstractShaderProperty.cs

         private string m_Name;
 
         [SerializeField]
+        private string m_CustomReferenceName;
+
+        [SerializeField]
+
+        [SerializeField]
+        private bool m_UseCustomReferenceName = false;
 
         [SerializeField]
         private SerializableGuid m_Guid = new SerializableGuid();
             set { m_Name = value; }
         }
 
+        public string customReferenceName
+        {
+            get
+            {
+                if (string.IsNullOrEmpty(m_CustomReferenceName))
+                    m_CustomReferenceName = "_" + displayName;
+                return m_CustomReferenceName;
+            }
+            set { m_CustomReferenceName = value; }
+        }
+
         string m_DefaultReferenceName;
 
         public string referenceName
+                if (useCustomReferenceName)
+                {
+                    return customReferenceName;
+                }
+
                 if (string.IsNullOrEmpty(overrideReferenceName))
                 {
                     if (string.IsNullOrEmpty(m_DefaultReferenceName))
         {
             get { return m_GeneratePropertyBlock; }
             set { m_GeneratePropertyBlock = value; }
+        }
+
+        public bool useCustomReferenceName
+        {
+            get { return m_UseCustomReferenceName; }
+            set { m_UseCustomReferenceName = value; }
         }
 
         public abstract Vector4 defaultValue { get; }

com.unity.shadergraph/Editor/Data/Graphs/IShaderProperty.cs

         PropertyType propertyType { get; }
         Guid guid { get; }
         bool generatePropertyBlock { get; set; }
+        bool useCustomReferenceName { get; set; }
+        string customReferenceName { get; set; }
         Vector4 defaultValue { get; }
         string overrideReferenceName { get; set; }
 

com.unity.shadergraph/Editor/Drawing/Blackboard/BlackboardFieldPropertyView.cs

 using UnityEditor.Graphing;
 using UnityEngine;
 using UnityEngine.Experimental.UIElements;
+using Toggle = UnityEngine.Experimental.UIElements.Toggle;
 
 namespace UnityEditor.ShaderGraph.Drawing
 {
 
+        Toggle m_UseCustomReferenceNameToggle;
+        TextField m_ReferenceNameField;
+
+
+            m_ReferenceNameField = new TextField(30, false, false, ' ');
+            AddRow("Reference name", m_ReferenceNameField);
+            m_UseCustomReferenceNameToggle = new Toggle(() =>
+            {
+                property.useCustomReferenceName = m_UseCustomReferenceNameToggle.on;
+                m_ReferenceNameField.SetEnabled(property.useCustomReferenceName);
+                m_Graph.ValidateGraph();
+            });
+            m_UseCustomReferenceNameToggle.on = property.useCustomReferenceName;
+            m_ReferenceNameField.value = property.customReferenceName;
+            m_ReferenceNameField.SetEnabled(property.useCustomReferenceName);
+            m_ReferenceNameField.OnValueChanged(newName =>
+            {
+                property.customReferenceName = newName.newValue;
+            });
+            AddRow("Specify reference name", m_UseCustomReferenceNameToggle);
+
             if (property is Vector1ShaderProperty)
             {
                 VisualElement floatRow = new VisualElement();
 //            AddRow("Range", new Toggle(null));
 //            AddRow("Default", new TextField());
 //            AddRow("Tooltip", new TextField());
+
 
             AddToClassList("sgblackboardFieldPropertyView");
         }