riversong-code-showcase/Source/Riversong/Game/World/Terrain/TileHighlight/TileHighlight.cs

using System;
using Unity.Collections;
using Unity.Mathematics;
using UnityEngine;
using Object = UnityEngine.Object;

namespace DanieleMarotta.RiversongCodeShowcase
{
    public class TileHighlight : IDisposable
    {
        private NativeArray<Color32> _clear;

        private NativeGrid<Color32> _grid;

        public Texture2D Texture { get; private set; }

        public void Create(int2 size)
        {
            Texture = new Texture2D(size.x, size.y, TextureFormat.RGBA32, false);

            _clear = new NativeArray<Color32>(size.x * size.y, Allocator.Persistent);
            _grid = new NativeGrid<Color32>(size, Allocator.Persistent);
        }

        public void Dispose()
        {
            if (Texture)
            {
                Object.Destroy(Texture);
                Texture = null;
            }

            if (_clear.IsCreated)
            {
                _clear.Dispose();
                _clear = default;
            }

            if (_grid != null)
            {
                _grid.Dispose();
                _grid = null;
            }
        }

        public void Apply()
        {
            var dataArray = _grid.GetNativeArray();

            Texture.SetPixelData(dataArray, 0);
            Texture.Apply();

            NativeArray<Color32>.Copy(_clear, dataArray);
        }

        public void AddTile(int2 tile, Color32 color)
        {
            _grid.SetValue(tile, color);
        }
    }
}