ScriptableRenderPipeline/MaterialGraphProject/Assets/Matt/NormalBlend.cs

using UnityEngine.Graphing;

namespace UnityEngine.MaterialGraph
{
    [Title("Art/Normal Blend")]
    public class NormalBlendNode : Function2Input, IGeneratesFunction
    {
        public NormalBlendNode()
        {
            name = "Normal Blend";
        }

        protected override string GetFunctionName()
        {
            return "unity_normalblend_" + precision;
        }

        protected override MaterialSlot GetInputSlot1()
        {
            return new MaterialSlot(InputSlot1Id, GetInputSlot1Name(), kInputSlot1ShaderName, SlotType.Input, SlotValueType.Vector3, Vector4.zero);
        }

        protected override MaterialSlot GetInputSlot2()
        {
            return new MaterialSlot(InputSlot2Id, GetInputSlot2Name(), kInputSlot2ShaderName, SlotType.Input, SlotValueType.Vector3, Vector4.zero);
        }

        protected override MaterialSlot GetOutputSlot()
        {
            return new MaterialSlot(OutputSlotId, GetOutputSlotName(), kOutputSlotShaderName, SlotType.Output, SlotValueType.Vector3, Vector4.zero);
        }

        public void GenerateNodeFunction(ShaderGenerator visitor, GenerationMode generationMode)
        {
            var outputString = new ShaderGenerator();
            outputString.AddShaderChunk(GetFunctionPrototype("arg1", "arg2"), false);
            outputString.AddShaderChunk("{", false);
            outputString.Indent();
            outputString.AddShaderChunk("return normalize("+precision+"3(arg1.rg + arg2.rg, arg1.b * arg2.b));", false);
            outputString.Deindent();
            outputString.AddShaderChunk("}", false);

            visitor.AddShaderChunk(outputString.GetShaderString(0), true);
        }
    }
}