using UnityEngine;
using UnityEditor.ShaderGraph;
using System.Reflection;

[Title("Utility", "Graph Preview")]
public class GraphPreviewNode : CodeFunctionNode
{
    protected override MethodInfo GetFunctionToConvert()
    {
        return GetType().GetMethod("MyCustomFunction",
            BindingFlags.Static | BindingFlags.NonPublic);
    }
    static string MyCustomFunction(
        [Slot(0, Binding.MeshUV0)] Vector2 UV,
        [Slot(1, Binding.None)] Vector1 Input,
        [Slot(2, Binding.None, 0.018f, 0f, 0f, 0f)] Vector1 LineWidth,
        [Slot(3, Binding.None, true)] out ColorRGB OutColor,
        [Slot(4, Binding.None)] out Vector1 OutFloat
    )
    {
        return @"{
                #define LINE_SIZE LineWidth
                #define LINE_COLOR float4(1,1,1,1)
                #define BRIGHTNESS 5.0
                #define X (Input)
                #define Y (UV.y)
                #define InvX (1.0 - X)
                #define InvY (1.0 - Y)
                OutColor = BRIGHTNESS * LINE_COLOR * (
                    smoothstep(Y - LINE_SIZE, Y + LINE_SIZE, X)
                    * smoothstep(InvY - LINE_SIZE, InvY + LINE_SIZE, InvX)
                );
                OutFloat = Input;
            }";
    }
}