DepthNormalsTextureNode.cs

using System.Collections.Generic;
using UnityEngine;
using UnityEditor.Graphing;

namespace UnityEditor.ShaderGraph
{
    [Title("Custom", "Input", "Texture", "_CameraDepthNormalsTexture")]
    class DepthNormalsTextureNode : AbstractMaterialNode
    {
        public const int OutputSlotId = 0;
        const string kOutputSlotName = "Out";

        private string inputTexture;

        public DepthNormalsTextureNode()
        {
            name = "_CameraDepthNormalsTexture";
            inputTexture = "_CameraDepthNormalsTexture";
            UpdateNodeAfterDeserialization();
        }

        public sealed override void UpdateNodeAfterDeserialization()
        {
            AddSlot(new Texture2DMaterialSlot(OutputSlotId, kOutputSlotName, kOutputSlotName, SlotType.Output));
            RemoveSlotsNameNotMatching(new[] {OutputSlotId});
        }

        public override void CollectShaderProperties(PropertyCollector properties, GenerationMode generationMode)
        {
            properties.AddShaderProperty(new TextureShaderProperty
            {
                displayName = "Main Texture",
                overrideReferenceName = GetVariableNameForSlot(OutputSlotId),
                generatePropertyBlock = false
            });
        }

        public override void CollectPreviewMaterialProperties(List<PreviewProperty> properties)
        {
            properties.Add(new PreviewProperty(PropertyType.Texture2D)
            {
                name = GetVariableNameForSlot(OutputSlotId),
                textureValue = Shader.GetGlobalTexture(inputTexture)
            });
        }

        public override string GetVariableNameForSlot(int slotId)
        {
            return slotId == OutputSlotId ? inputTexture : base.GetVariableNameForSlot(slotId);
        }
    }
}