ScriptableRenderPipeline/MaterialGraphProject/Assets/Andre/ToggleNode.cs

using UnityEngine.Graphing;

namespace UnityEngine.MaterialGraph
{
    [Title("Input/Toggle")]
    public class ToggleNode : PropertyNode, IGeneratesBodyCode
    {
        [SerializeField]
        private float m_Float;
		private bool m_ToggleState;

        private const int kOutputSlotId = 0;
        private const string kOutputSlotName = "Ouput";

        public ToggleNode()
        {
            name = "Toggle";
            UpdateNodeAfterDeserialization();
        }

		/* public override bool hasPreview
        {
            get { return true; }
        }*/

        public sealed override void UpdateNodeAfterDeserialization()
        {
            AddSlot(new MaterialSlot(kOutputSlotId, kOutputSlotName, kOutputSlotName, SlotType.Output, SlotValueType.Vector1, Vector2.zero));
            RemoveSlotsNameNotMatching(new[] { kOutputSlotId });
        }

        public override PropertyType propertyType
        {
			get { return PropertyType.Float; }
        }

        public bool value
        {
            get { return m_ToggleState; }
            set
            {
				if (m_ToggleState == value)
                    return;

				m_ToggleState = value;
                if (onModified != null)
                {
                    onModified(this, ModificationScope.Node);
                }
            }
        }

        public override void GeneratePropertyBlock(PropertyGenerator visitor, GenerationMode generationMode)
        {
            if (exposedState == ExposedState.Exposed)
				visitor.AddShaderProperty(new FloatPropertyChunk(propertyName, description, 0f, PropertyChunk.HideState.Visible));
        }

        public override void GeneratePropertyUsages(ShaderGenerator visitor, GenerationMode generationMode)
        {
            if (exposedState == ExposedState.Exposed || generationMode.IsPreview())
                visitor.AddShaderChunk(precision + " " + propertyName + ";", true);
        }

        public void GenerateNodeCode(ShaderGenerator visitor, GenerationMode generationMode)
        {
            if (exposedState == ExposedState.Exposed || generationMode.IsPreview())
                return;

			visitor.AddShaderChunk(value.ToString (), true);
        }

        public override PreviewProperty GetPreviewProperty()
        {
            return new PreviewProperty
                   {
						m_Name = propertyName,
						m_PropType = PropertyType.Float,
						m_Float = value ? 1f : 0f
                   };
        }
    }
}