Added Cubemap nodes

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/MaterialSlot.cs

                     return "(SS)";
                 case ConcreteSlotValueType.Texture2D:
                     return "(T)";
+                case ConcreteSlotValueType.Cubemap:
+                    return "(C)";
                 default:
                     return "(E)";
             }
                     return slotType == SlotType.Input
                         ? new Texture2DInputMaterialSlot(slotId, displayName, shaderOutputName, shaderStage, hidden)
                         : new Texture2DMaterialSlot(slotId, displayName, shaderOutputName, slotType, shaderStage, hidden);
+                case SlotValueType.Cubemap:
+                    return slotType == SlotType.Input
+                        ? new CubemapInputMaterialSlot(slotId, displayName, shaderOutputName, shaderStage, hidden)
+                        : new CubemapMaterialSlot(slotId, displayName, shaderOutputName, slotType, shaderStage, hidden);
                 case SlotValueType.Dynamic:
                     return new DynamicVectorMaterialSlot(slotId, displayName, shaderOutputName, slotType, defaultValue, shaderStage, hidden);
                 case SlotValueType.Vector4:
                     return inputType == SlotValueType.Matrix2;
                 case SlotValueType.Texture2D:
                     return inputType == SlotValueType.Texture2D;
+                case SlotValueType.Cubemap:
+                    return inputType == SlotValueType.Cubemap;
                 case SlotValueType.Dynamic:
                 case SlotValueType.Vector4:
                     return inputType == SlotValueType.Vector4
             {
                 case ConcreteSlotValueType.Texture2D:
                     return PropertyType.Texture;
+                case ConcreteSlotValueType.Cubemap:
+                    return PropertyType.Cubemap;
                 case ConcreteSlotValueType.Vector1:
                     return PropertyType.Float;
                 case ConcreteSlotValueType.Vector2:

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/AbstractMaterialNode.cs

                     return p + "4";
                 case ConcreteSlotValueType.Texture2D:
                     return "Texture2D";
+                case ConcreteSlotValueType.Cubemap:
+                    return "Cubemap";
                 case ConcreteSlotValueType.Matrix2:
                     return "Matrix2x2";
                 case ConcreteSlotValueType.Matrix3:

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/CodeFunctionNode.cs

             {
                 return SlotValueType.Texture2D;
             }
+            if (t == typeof(Cubemap))
+            {
+                return SlotValueType.Cubemap;
+            }
             if (t == typeof(SamplerState))
             {
                 return SlotValueType.SamplerState;

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/PropertyNode.cs

                 AddSlot(new Texture2DMaterialSlot(OutputSlotId, "T", "T", SlotType.Output));
                 RemoveSlotsNameNotMatching(new[] {OutputSlotId});
             }
+            else if (property is CubemapShaderProperty)
+            {
+                AddSlot(new CubemapMaterialSlot(OutputSlotId, "C", "C", SlotType.Output));
+                RemoveSlotsNameNotMatching(new[] { OutputSlotId });
+            }
         }
 
         public void GenerateNodeCode(ShaderGenerator visitor, GenerationMode generationMode)
             var graph = owner as AbstractMaterialGraph;
             var property = graph.properties.FirstOrDefault(x => x.guid == propertyGuid);
 
-            if (!(property is TextureShaderProperty))
+            if (!(property is TextureShaderProperty) && !(property is CubemapShaderProperty))
                 return base.GetVariableNameForSlot(slotId);
 
             return property.referenceName;

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/SlotValue.cs

         Matrix3,
         Matrix2,
         Texture2D,
+        Cubemap,
         Dynamic,
         Vector4,
         Vector3,
         Matrix3,
         Matrix2,
         Texture2D,
+        Cubemap,
         Vector4,
         Vector3,
         Vector2,
             "typeMatrix",
             "typeMatrix",
             "typeTexture2D",
+            "typeCubemap",
             "typeFloat4",
             "typeFloat3",
             "typeFloat2",

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/SubGraph/AbstractSubGraphNode.cs

                     case PropertyType.Texture:
                         slotType = SlotValueType.Texture2D;
                         break;
+                    case PropertyType.Cubemap:
+                        slotType = SlotValueType.Cubemap;
+                        break;
                     case PropertyType.Float:
                         slotType = SlotValueType.Vector1;
                         break;
                     var tProp = prop as TextureShaderProperty;
                     if (tSlot != null && tProp != null)
                         tSlot.texture = tProp.value.texture;
+                }
+                // copy default for cubemap for niceness
+                else if (slotType == SlotValueType.Cubemap && propType == PropertyType.Cubemap)
+                {
+                    var tSlot = slot as CubemapInputMaterialSlot;
+                    var tProp = prop as CubemapShaderProperty;
+                    if (tSlot != null && tProp != null)
+                        tSlot.cubemap = tProp.value.cubemap;
                 }
                 AddSlot(slot);
                 validNames.Add(id);

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Inspector/GraphInspectorView.cs

             gm.AddItem(new GUIContent("Vector4"), false, () => AddProperty(new Vector4ShaderProperty()));
             gm.AddItem(new GUIContent("Color"), false, () => AddProperty(new ColorShaderProperty()));
             gm.AddItem(new GUIContent("Texture"), false, () => AddProperty(new TextureShaderProperty()));
+            gm.AddItem(new GUIContent("Cubemap"), false, () => AddProperty(new CubemapShaderProperty()));
             gm.ShowAsContext();
         }
 

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Inspector/ShaderPropertyView.cs

                 objectField.OnValueChanged(OnTextureChanged);
                 Add(objectField);
             }
+            else if (property is CubemapShaderProperty)
+            {
+                var fProp = (CubemapShaderProperty)property;
+                var objectField = new ObjectField { name = "value", objectType = typeof(Cubemap), value = fProp.value.cubemap };
+                objectField.OnValueChanged(OnCubemapChanged);
+                Add(objectField);
+            }
 
             Add(new Button(OnClickRemove) { name = "remove", text = "Remove" });
         }
             if (newValue != fProp.value.texture)
             {
                 fProp.value.texture = newValue;
+                NotifyNodes();
+            }
+        }
+
+        void OnCubemapChanged(ChangeEvent<Object> evt)
+        {
+            var fProp = (CubemapShaderProperty)property;
+            var newValue = (Cubemap)evt.newValue;
+            if (newValue != fProp.value.cubemap)
+            {
+                fProp.value.cubemap = newValue;
                 NotifyNodes();
             }
         }

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Manipulators/GraphDropTarget.cs

         bool ValidateObject(Object obj)
         {
             return EditorUtility.IsPersistent(obj)
-                && (obj is Texture2D || obj is MaterialSubGraphAsset);
+                && (obj is Texture2D || obj is Cubemap || obj is MaterialSubGraphAsset);
         }
 
         void CreateNode(Object obj, Vector2 nodePosition)
             {
                 m_Graph.owner.RegisterCompleteObjectUndo("Drag Texture");
                 var property = new TextureShaderProperty { displayName = texture2D.name, value = { texture = texture2D } };
+                m_Graph.AddShaderProperty(property);
+                var node = new PropertyNode();
+                var drawState = node.drawState;
+                drawState.position = new Rect(nodePosition, drawState.position.size);
+                node.drawState = drawState;
+                m_Graph.AddNode(node);
+                node.propertyGuid = property.guid;
+            }
+
+            var cubemap = obj as Cubemap;
+            if (cubemap != null)
+            {
+                m_Graph.owner.RegisterCompleteObjectUndo("Drag Cubemap");
+                var property = new CubemapShaderProperty { displayName = cubemap.name, value = { cubemap = cubemap } };
                 m_Graph.AddShaderProperty(property);
                 var node = new PropertyNode();
                 var drawState = node.drawState;

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/MaterialGraphEditWindow.cs

                     case ConcreteSlotValueType.Texture2D:
                         prop = new TextureShaderProperty();
                         break;
+                    case ConcreteSlotValueType.Cubemap:
+                        prop = new CubemapShaderProperty();
+                        break;
                     case ConcreteSlotValueType.Vector4:
                         prop = new Vector4ShaderProperty();
                         break;

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/CubemapInputMaterialSlot.cs

+using System;
+using UnityEditor.Graphing;
+using UnityEditor.ShaderGraph.Drawing.Slots;
+using UnityEngine;
+using UnityEngine.Experimental.UIElements;
+
+namespace UnityEditor.ShaderGraph
+{
+    [Serializable]
+    public class CubemapInputMaterialSlot : CubemapMaterialSlot
+    {
+        [SerializeField]
+        private SerializableCubemap m_Cubemap = new SerializableCubemap();
+
+        public Cubemap cubemap
+        {
+            get { return m_Cubemap.cubemap; }
+            set { m_Cubemap.cubemap = value; }
+        }
+
+        public CubemapInputMaterialSlot()
+        {}
+
+        public CubemapInputMaterialSlot(
+            int slotId,
+            string displayName,
+            string shaderOutputName,
+            ShaderStage shaderStage = ShaderStage.Dynamic,
+            bool hidden = false)
+            : base(slotId, displayName, shaderOutputName, SlotType.Input, shaderStage, hidden)
+        {}
+
+        public override VisualElement InstantiateControl()
+        {
+            return new CubemapSlotControlView(this);
+        }
+
+        public override string GetDefaultValue(GenerationMode generationMode)
+        {
+            var matOwner = owner as AbstractMaterialNode;
+            if (matOwner == null)
+                throw new Exception(string.Format("Slot {0} either has no owner, or the owner is not a {1}", this, typeof(AbstractMaterialNode)));
+
+            return matOwner.GetVariableNameForSlot(id);
+        }
+
+        public override void AddDefaultProperty(PropertyCollector properties, GenerationMode generationMode)
+        {
+            var matOwner = owner as AbstractMaterialNode;
+            if (matOwner == null)
+                throw new Exception(string.Format("Slot {0} either has no owner, or the owner is not a {1}", this, typeof(AbstractMaterialNode)));
+
+            var prop = new CubemapShaderProperty();
+            prop.overrideReferenceName = matOwner.GetVariableNameForSlot(id);
+            prop.modifiable = false;
+            prop.generatePropertyBlock = true;
+            prop.value.cubemap = cubemap;
+            properties.AddShaderProperty(prop);
+        }
+
+        public override PreviewProperty GetPreviewProperty(string name)
+        {
+            var pp = new PreviewProperty
+            {
+                m_Name = name,
+                m_PropType = PropertyType.Cubemap,
+                m_Cubemap = cubemap
+            };
+            return pp;
+        }
+
+        public override void CopyValuesFrom(MaterialSlot foundSlot)
+        {
+            var slot = foundSlot as CubemapInputMaterialSlot;
+            if (slot != null)
+                m_Cubemap = slot.m_Cubemap;
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/CubemapInputMaterialSlot.cs.meta

+fileFormatVersion: 2
+guid: 7b961f6f7e2617446afb6a8e329d84d4
+timeCreated: 1509276977

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/CubemapMaterialSlot.cs

+using System;
+using UnityEditor.Graphing;
+
+namespace UnityEditor.ShaderGraph
+{
+    [Serializable]
+    public class CubemapMaterialSlot : MaterialSlot
+    {
+        public CubemapMaterialSlot()
+        {}
+
+        public CubemapMaterialSlot(
+            int slotId,
+            string displayName,
+            string shaderOutputName,
+            SlotType slotType,
+            ShaderStage shaderStage = ShaderStage.Dynamic,
+            bool hidden = false)
+            : base(slotId, displayName, shaderOutputName, slotType, shaderStage, hidden)
+        {}
+
+        public override SlotValueType valueType { get { return SlotValueType.Cubemap; } }
+        public override ConcreteSlotValueType concreteValueType { get { return ConcreteSlotValueType.Cubemap; } }
+
+        public override void AddDefaultProperty(PropertyCollector properties, GenerationMode generationMode)
+        {}
+
+        public override void CopyValuesFrom(MaterialSlot foundSlot)
+        {}
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/CubemapMaterialSlot.cs.meta

+fileFormatVersion: 2
+guid: ada5a840e90db5e4d901c686dca382ab
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/CubemapShaderProperty.cs

+using System;
+using System.Text;
+using UnityEngine;
+
+namespace UnityEditor.ShaderGraph
+{
+    [Serializable]
+    public class CubemapShaderProperty : AbstractShaderProperty<SerializableCubemap>
+    {
+        [SerializeField]
+        private bool m_Modifiable = true;
+
+        public CubemapShaderProperty()
+        {
+            value = new SerializableCubemap();
+        }
+
+        public override PropertyType propertyType
+        {
+            get { return PropertyType.Cubemap; }
+        }
+
+        public bool modifiable
+        {
+            get { return m_Modifiable; }
+            set { m_Modifiable = value; }
+        }
+
+        public override Vector4 defaultValue
+        {
+            get { return new Vector4(); }
+        }
+
+        public override string GetPropertyBlockString()
+        {
+            var result = new StringBuilder();
+            if (!m_Modifiable)
+            {
+                result.Append("[NonModifiableTextureData] ");
+            }
+            result.Append("[NoScaleOffset] ");
+
+            result.Append(referenceName);
+            result.Append("(\"");
+            result.Append(displayName);
+            result.Append("\", CUBE) = \"\" {}");
+            return result.ToString();
+        }
+
+        public override string GetPropertyDeclarationString()
+        {
+            return "samplerCUBE " + referenceName + ";";
+        }
+
+        /*public override string GetInlinePropertyDeclarationString()
+        {
+            return "UNITY_DECLARE_TEX2D_NOSAMPLER(" + referenceName + ");";
+        }*/
+
+        public override PreviewProperty GetPreviewMaterialProperty()
+        {
+            return new PreviewProperty()
+            {
+                m_Name = referenceName,
+                m_PropType = PropertyType.Cubemap,
+                m_Cubemap = value.cubemap
+            };
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/CubemapShaderProperty.cs.meta

+fileFormatVersion: 2
+guid: ca5ddce766d5ae24f8be282b4f7a21bd
+timeCreated: 1505346949

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/SerializableCubemap.cs

+using System;
+using UnityEngine;
+
+namespace UnityEditor.ShaderGraph
+{
+    [Serializable]
+    public class SerializableCubemap
+    {
+        [SerializeField]
+        private string m_SerializedCubemap;
+
+        [Serializable]
+        private class CubemapHelper
+        {
+            public Cubemap cubemap;
+        }
+
+        public Cubemap cubemap
+        {
+            get
+            {
+                if (string.IsNullOrEmpty(m_SerializedCubemap))
+                    return null;
+
+                var cube = new CubemapHelper();
+                EditorJsonUtility.FromJsonOverwrite(m_SerializedCubemap, cube);
+                return cube.cubemap;
+            }
+            set
+            {
+                if (cubemap == value)
+                    return;
+
+                var cube = new CubemapHelper();
+                cube.cubemap = value;
+                m_SerializedCubemap = EditorJsonUtility.ToJson(cube, true);
+            }
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/SerializableCubemap.cs.meta

+fileFormatVersion: 2
+guid: 01e80e004e94f5e48ad1cb83d5701300
+timeCreated: 1505346945

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Input/Texture/CubemapAssetNode.cs

+using System.Collections.Generic;
+using UnityEditor.ShaderGraph.Drawing.Controls;
+using UnityEngine;
+using UnityEditor.Graphing;
+
+namespace UnityEditor.ShaderGraph
+{
+    [Title("Input/Texture/Cubemap Asset")]
+    public class CubemapAssetNode : AbstractMaterialNode
+    {
+        public const int OutputSlotId = 0;
+
+        const string kOutputSlotName = "Out";
+
+        public CubemapAssetNode()
+        {
+            name = "Cubemap Asset";
+            UpdateNodeAfterDeserialization();
+        }
+
+        public sealed override void UpdateNodeAfterDeserialization()
+        {
+            AddSlot(new CubemapMaterialSlot(OutputSlotId, kOutputSlotName, kOutputSlotName, SlotType.Output));
+            RemoveSlotsNameNotMatching(new[] { OutputSlotId });
+        }
+
+        [SerializeField]
+        private SerializableCubemap m_Cubemap = new SerializableCubemap();
+
+        [CubemapControl("")]
+        public Cubemap cubemap
+        {
+            get { return m_Cubemap.cubemap; }
+            set
+            {
+                if (m_Cubemap.cubemap == value)
+                    return;
+                m_Cubemap.cubemap = value;
+                if (onModified != null)
+                {
+                    onModified(this, ModificationScope.Node);
+                }
+            }
+        }
+
+        public override void CollectShaderProperties(PropertyCollector properties, GenerationMode generationMode)
+        {
+            properties.AddShaderProperty(new CubemapShaderProperty()
+            {
+                overrideReferenceName = GetVariableNameForSlot(OutputSlotId),
+                generatePropertyBlock = true,
+                value = m_Cubemap,
+                modifiable = false
+            });
+        }
+
+        public override void CollectPreviewMaterialProperties(List<PreviewProperty> properties)
+        {
+            properties.Add(new PreviewProperty
+            {
+                m_Name = GetVariableNameForSlot(OutputSlotId),
+                m_PropType = PropertyType.Cubemap,
+                m_Cubemap = cubemap
+            });
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Input/Texture/CubemapAssetNode.cs.meta

+fileFormatVersion: 2
+guid: 968ed0a541658844486b1ac5ab57ee2d
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Input/Texture/CubemapNode.cs

+using System.Linq;
+using System.Reflection;
+using UnityEngine;
+using UnityEditor.Graphing;
+using UnityEditor.ShaderGraph.Drawing.Controls;
+
+namespace UnityEditor.ShaderGraph
+{
+    [Title("Input/Texture/Cubemap")]
+    public class CubemapNode : AbstractMaterialNode, IGeneratesBodyCode, IMayRequireViewDirection, IMayRequireNormal
+    {
+        public const int OutputSlotId = 0;
+        public const int CubemapInputId = 1;
+        public const int ViewDirInputId = 2;
+        public const int NormalInputId = 3;
+
+        const string kOutputSlotName = "Out";
+        const string kCubemapInputName = "Cube";
+        const string kViewDirInputName = "ViewDir";
+        const string kNormalInputName = "Normal";
+
+        public override bool hasPreview { get { return true; } }
+
+        public CubemapNode()
+        {
+            name = "Cubemap";
+            UpdateNodeAfterDeserialization();
+        }
+
+        public sealed override void UpdateNodeAfterDeserialization()
+        {
+            AddSlot(new Vector4MaterialSlot(OutputSlotId, kOutputSlotName, kOutputSlotName, SlotType.Output, Vector4.zero));
+            AddSlot(new CubemapInputMaterialSlot(CubemapInputId, kCubemapInputName, kCubemapInputName));
+            AddSlot(new ViewDirectionMaterialSlot(ViewDirInputId, kViewDirInputName, kViewDirInputName, CoordinateSpace.Object));
+            AddSlot(new NormalMaterialSlot(NormalInputId, kNormalInputName, kNormalInputName, CoordinateSpace.Object));
+            RemoveSlotsNameNotMatching(new[] { OutputSlotId, CubemapInputId, ViewDirInputId, NormalInputId });
+        }
+
+        public override PreviewMode previewMode
+        {
+            get { return PreviewMode.Preview3D; }
+        }
+
+        // Node generations
+        public virtual void GenerateNodeCode(ShaderGenerator visitor, GenerationMode generationMode)
+        {
+            string result = string.Format("{0}4 {1} = texCUBE ({2}, reflect(-{3}, {4}));"
+                        , precision
+                        , GetVariableNameForSlot(OutputSlotId)
+                        , GetSlotValue(CubemapInputId, generationMode)
+                        , GetSlotValue(ViewDirInputId, generationMode)
+                        , GetSlotValue(NormalInputId, generationMode));
+
+            visitor.AddShaderChunk(result, true);
+        }
+
+        public NeededCoordinateSpace RequiresViewDirection()
+        {
+            var viewDirSlot = FindInputSlot<MaterialSlot>(ViewDirInputId);
+            var edgesViewDir = owner.GetEdges(viewDirSlot.slotReference);
+            if (!edgesViewDir.Any())
+                return CoordinateSpace.Object.ToNeededCoordinateSpace();
+            else
+                return NeededCoordinateSpace.None;
+        }
+
+        public NeededCoordinateSpace RequiresNormal()
+        {
+            var normalSlot = FindInputSlot<MaterialSlot>(NormalInputId);
+            var edgesNormal = owner.GetEdges(normalSlot.slotReference);
+            if (!edgesNormal.Any())
+                return CoordinateSpace.Object.ToNeededCoordinateSpace();
+            else
+                return NeededCoordinateSpace.None;
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Input/Texture/CubemapNode.cs.meta

+fileFormatVersion: 2
+guid: 6eaeb9c846408f74daeadcc3314810e4
+timeCreated: 1495637741
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Controls/CubemapControl.cs

+using System;
+using System.Reflection;
+using UnityEditor.Experimental.UIElements;
+using UnityEngine;
+using UnityEngine.Experimental.UIElements;
+using UnityEngine.Experimental.UIElements.StyleSheets;
+using UnityEditor.ShaderGraph;
+
+namespace UnityEditor.ShaderGraph.Drawing.Controls
+{
+    [AttributeUsage(AttributeTargets.Property)]
+    public class CubemapControlAttribute : Attribute, IControlAttribute
+    {
+        string m_Label;
+
+        public CubemapControlAttribute(string label = null)
+        {
+            m_Label = label;
+        }
+
+        public VisualElement InstantiateControl(AbstractMaterialNode node, PropertyInfo propertyInfo)
+        {
+            return new CubemapControlView(m_Label, node, propertyInfo);
+        }
+    }
+
+    public class CubemapControlView : VisualElement
+    {
+        AbstractMaterialNode m_Node;
+        PropertyInfo m_PropertyInfo;
+
+        public CubemapControlView(string label, AbstractMaterialNode node, PropertyInfo propertyInfo)
+        {
+            m_Node = node;
+            m_PropertyInfo = propertyInfo;
+            if (propertyInfo.PropertyType != typeof(Cubemap))
+                throw new ArgumentException("Property must be of type Texture.", "propertyInfo");
+            label = label ?? ObjectNames.NicifyVariableName(propertyInfo.Name);
+
+            if (!string.IsNullOrEmpty(label))
+                Add(new Label(label));
+
+            var cubemapField = new ObjectField { value = (Cubemap) m_PropertyInfo.GetValue(m_Node, null), objectType = typeof(Cubemap) };
+            cubemapField.OnValueChanged(OnChange);
+            Add(cubemapField);
+        }
+
+        void OnChange(ChangeEvent<UnityEngine.Object> evt)
+        {
+            m_Node.owner.owner.RegisterCompleteObjectUndo("Cubemap Change");
+            m_PropertyInfo.SetValue(m_Node, evt.newValue, null);
+            Dirty(ChangeType.Repaint);
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Controls/CubemapControl.cs.meta

+fileFormatVersion: 2
+guid: abdad6e5c36e0994290fcacce2fab066
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Views/Slots/CubemapSlotControlView.cs

+using System;
+using UnityEditor.Experimental.UIElements;
+using UnityEditor.Graphing;
+using UnityEngine;
+using UnityEngine.Experimental.UIElements;
+using UnityEngine.Experimental.UIElements.StyleSheets;
+using Object = UnityEngine.Object;
+
+namespace UnityEditor.ShaderGraph.Drawing.Slots
+{
+    public class CubemapSlotControlView : VisualElement
+    {
+        CubemapInputMaterialSlot m_Slot;
+
+        public CubemapSlotControlView(CubemapInputMaterialSlot slot)
+        {
+            m_Slot = slot;
+            var objectField = new ObjectField { objectType = typeof(Cubemap), value = m_Slot.cubemap };
+            objectField.OnValueChanged(OnValueChanged);
+            Add(objectField);
+        }
+
+        void OnValueChanged(ChangeEvent<Object> evt)
+        {
+            var cubemap = evt.newValue as Cubemap;
+            if (cubemap != m_Slot.cubemap)
+            {
+                m_Slot.owner.owner.owner.RegisterCompleteObjectUndo("Change Cubemap");
+                m_Slot.cubemap = cubemap;
+                if (m_Slot.owner.onModified != null)
+                    m_Slot.owner.onModified(m_Slot.owner, ModificationScope.Node);
+            }
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Views/Slots/CubemapSlotControlView.cs.meta

+fileFormatVersion: 2
+guid: b54f542a9d5f7b84e974b54d625d73ea
+timeCreated: 1509718979