Adding ChannelBlend node

MaterialGraphProject/Assets/Eduardo/FunctionNInNOut.cs

         private string GetOutputDeclaration()
         {
             string outDeclaration = "";
-            foreach (ISlot outSlot in GetOutputSlots<ISlot>())
+            foreach (MaterialSlot outSlot in GetOutputSlots<MaterialSlot>())
             {
                 outDeclaration += "\n " + precision + GetSlotTypeName(outSlot.id) + " " + GetVariableNameForSlot(outSlot.id) + ";\n";
             }

MaterialGraphProject/Assets/Eduardo/HeightToNormalNode.cs

 
 namespace UnityEngine.MaterialGraph
 {
-    [Title("HeightToNormal")]
+    [Title("Utility/Heightmap To Normalmap")]
     public class HeightToNormalNode : FunctionNInNOut, IGeneratesFunction
     {
 

MaterialGraphProject/Assets/Eduardo/ChannelBlendNode.cs

+using UnityEngine.Graphing;
+using System.Linq;
+using System.Collections;
+
+namespace UnityEngine.MaterialGraph
+{
+    [Title("ChannelBlend")]
+    public class ChannelBlend : FunctionNInNOut, IGeneratesFunction
+    {
+
+        public ChannelBlend()
+        {
+            name = "ChannelBlend";
+            AddSlot("Mask", "mask", Graphing.SlotType.Input, SlotValueType.Vector4, Vector4.zero);
+            AddSlot("RColor", "rCol", Graphing.SlotType.Input, SlotValueType.Vector4, Vector4.zero);
+            AddSlot("GColor", "gCol", Graphing.SlotType.Input, SlotValueType.Vector4, Vector4.zero);
+            AddSlot("BColor", "bCol", Graphing.SlotType.Input, SlotValueType.Vector4, Vector4.zero);
+            AddSlot("AColor", "aCol", Graphing.SlotType.Input, SlotValueType.Vector4, Vector4.zero);
+            AddSlot("BGColor", "bgCol", Graphing.SlotType.Input, SlotValueType.Vector4, Vector4.zero);
+
+            AddSlot("BlendedColor", "blendCol", Graphing.SlotType.Output, SlotValueType.Vector4, Vector4.zero);
+        }
+
+        protected override string GetFunctionName()
+        {
+            return "unity_ChannelBlend";
+        }
+
+        public override bool hasPreview
+        {
+            get { return true; }
+        }
+
+        public void GenerateNodeFunction(ShaderGenerator visitor, GenerationMode generationMode)
+        {
+            var outputString = new ShaderGenerator();
+            outputString.AddShaderChunk(GetFunctionPrototype(), false);
+            outputString.AddShaderChunk("{", false);
+            outputString.AddShaderChunk("float4 background = step(max(mask.r,max(mask.g,mask.b)), 0.001) * bgCol;", false);
+            outputString.AddShaderChunk("blendCol = mask.r * rCol + mask.g * gCol + mask.b * bCol + mask.a * aCol + background;", false);
+            outputString.AddShaderChunk("}", false);
+
+            visitor.AddShaderChunk(outputString.GetShaderString(0), true);
+        }
+    }
+}

MaterialGraphProject/Assets/Eduardo/ChannelBlendNode.cs.meta

+fileFormatVersion: 2
+guid: a3ee559026fa1ca4aab68fafbdcfbc56
+timeCreated: 1495618140
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: