using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;

namespace UnityEditor.Graphs.Material
{
	[Title("Input/World Pos Node")]
	public class WorldPosNode : BaseMaterialNode, IGeneratesVertexToFragmentBlock
	{
		private const string kOutputSlotName = "WorldPos";

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

		public override void Init()
		{
			base.Init();
			name = "WorldPos";
			AddSlot(new Slot(SlotType.OutputSlot, kOutputSlotName));
		}

		public override string GetOutputVariableNameForSlot(Slot slot, GenerationMode generationMode)
		{
			// For now add () around whole expressions so that things like .xy work
			// A better solution would be to provide information on the context in which this is used so that we avoid expressions like (half4(p, 1, 1)).xy
			// and can directly output p.
			return "(" + precision + "4 (IN.worldPos, 1))";
		}

		public void GenerateVertexToFragmentBlock(ShaderGenerator visitor, GenerationMode generationMode)
		{
			visitor.AddShaderChunk(precision + "3 worldPos;", true);
		}
	}
}