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

[Title("Wunderwunsch", "HexNode")]
public class HexNode : CodeFunctionNode
{
    public HexNode()
    {
        name = "HexNode";
    }

    protected override MethodInfo GetFunctionToConvert()
    {
        return GetType().GetMethod("HexNodeFunction", BindingFlags.Static | BindingFlags.NonPublic);

    }

    static string HexNodeFunction
        (
        [Slot(0, Binding.None)] Vector3 WorldPosition,
        [Slot(1, Binding.None)] Vector2 gridSize,
        [Slot(2, Binding.None)] Vector1 borderWidth,
        [Slot(3, Binding.None)] out Vector1 value
        )
    {
        return @"
        {
            float2 g = gridSize;
            float2 p = abs(WorldPosition.xz);
            p = p * g;
            float2 q = float2( p.x*1.1547006, p.y + p.x*0.5773503 );
            float2 pi = floor(q);
            float2 pf = frac(q);
            float v = fmod(pi.x + pi.y, 3.0);
            float ca = step(1.0,v), cb = step(2.0,v);
            float2 ma = step(pf.xy,pf.yx);
            float e = dot( ma, 1.0-pf.yx + ca*(pf.x+pf.y-1.0) + cb*(pf.yx-2.0*pf.xy) );
            value = step(borderWidth,e);
        }
        ";
    }
}