Fix node compatibility check (#58)

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Presenters/MaterialGraphPresenter.cs

         public override List<NodeAnchorPresenter> GetCompatibleAnchors(NodeAnchorPresenter startAnchor, NodeAdapter nodeAdapter)
         {
             return allChildren.OfType<NodeAnchorPresenter>()
-                .Where(nap => nap.IsConnectable() &&
-                nap.orientation == startAnchor.orientation &&
-                nap.direction != startAnchor.direction &&
-                nodeAdapter.GetAdapter(nap.source, startAnchor.source) != null &&
-                (startAnchor is GraphAnchorPresenter && ((GraphAnchorPresenter)nap).slot is MaterialSlot &&
-                 ((MaterialSlot)((GraphAnchorPresenter)startAnchor).slot).IsCompatibleWithInputSlotType(((MaterialSlot)((GraphAnchorPresenter)nap).slot).valueType)))
+                .Where(nap =>
+                    nap.IsConnectable()
+                    && nap.orientation == startAnchor.orientation
+                    && nap.direction != startAnchor.direction
+                    && nodeAdapter.GetAdapter(nap.source, startAnchor.source) != null && startAnchor is GraphAnchorPresenter && ((GraphAnchorPresenter)nap).slot is MaterialSlot
+                    && ((GraphAnchorPresenter)startAnchor).slot.owner != ((GraphAnchorPresenter)nap).slot.owner
+                    && ((MaterialSlot)((GraphAnchorPresenter)startAnchor).slot).IsCompatibleWithInputSlotType(((MaterialSlot)((GraphAnchorPresenter)nap).slot).valueType))
                 .ToList();
         }
 

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Graphs/MaterialSlot.cs

         [SerializeField]
         private string m_ShaderOutputName;
 
-        public MaterialSlot() {}
+        public MaterialSlot() { }
 
         public MaterialSlot(int slotId, string displayName, string shaderOutputName, SlotType slotType, SlotValueType valueType, Vector4 defaultValue, bool hidden = false)
             : base(slotId, displayName, slotType, hidden)
 
         public bool IsCompatibleWithInputSlotType(SlotValueType inputType)
         {
-            return (inputType == SlotValueType.Dynamic || valueType == SlotValueType.Vector1 || valueType <= inputType);
+            switch (valueType)
+            {
+                case SlotValueType.SamplerState:
+                    return inputType == SlotValueType.SamplerState;
+                case SlotValueType.Matrix4:
+                    return inputType == SlotValueType.Matrix4
+                        || inputType == SlotValueType.Matrix3
+                        || inputType == SlotValueType.Matrix2;
+                case SlotValueType.Matrix3:
+                    return inputType == SlotValueType.Matrix3
+                        || inputType == SlotValueType.Matrix2;
+                case SlotValueType.Matrix2:
+                    return inputType == SlotValueType.Matrix2;
+                case SlotValueType.Texture2D:
+                    return inputType == SlotValueType.Texture2D;
+                case SlotValueType.Vector4:
+                    return inputType == SlotValueType.Vector4
+                        || inputType == SlotValueType.Vector3
+                        || inputType == SlotValueType.Vector2
+                        || inputType == SlotValueType.Vector1
+                        || inputType == SlotValueType.Dynamic;
+                case SlotValueType.Vector3:
+                    return inputType == SlotValueType.Vector3
+                        || inputType == SlotValueType.Vector2
+                        || inputType == SlotValueType.Vector1
+                        || inputType == SlotValueType.Dynamic;
+                case SlotValueType.Vector2:
+                    return inputType == SlotValueType.Vector2
+                        || inputType == SlotValueType.Vector1
+                        || inputType == SlotValueType.Dynamic;
+                case SlotValueType.Dynamic:
+                case SlotValueType.Vector1:
+                    return inputType == SlotValueType.Vector4
+                        || inputType == SlotValueType.Vector3
+                        || inputType == SlotValueType.Vector2
+                        || inputType == SlotValueType.Vector1
+                        || inputType == SlotValueType.Dynamic;
+            }
+            return false;
         }
 
         public string GetDefaultValue(GenerationMode generationMode)