unity_native_render_plugin/Assets/Editor/TexturePack/TextureMapInfo.cs

using System;
using System.Collections.Generic;
using System.IO;
using Unity.Mathematics;
using UnityEditor;
using UnityEngine;
using UnityEngine.Rendering;

namespace TexturePacker
{
    public sealed class TextureMapInfo : ScriptableObject
    {
        public const string TextureMapDir = "Assets/Editor/TexturePack/Resources";

        [Serializable]
        public struct TextureInfo
        {
            public Texture2D OriginTexture;
            public int ArrayIndex;
            public float2 Offset;
        }

        [Serializable]
        public enum EPackType
        {
            Atlas,
            Array
        }

        public EPackType PackType = EPackType.Atlas;
        public SerializedDictionary<Texture2D, TextureInfo> OriginTexture2TextureInfo = new();
        public List<Texture2D> Textures;
        public Texture2D TextureAtlas;
        public float AtlasScale;
        public string TextureAtlasPath;
        public Texture2DArray TextureArray;
        public string TextureArrayPath;
        public bool IsNormalMap;

        [ContextMenu("Test")]
        private void Test()
        {
            Texture2D offsetTex = new Texture2D(Textures.Count, 1, TextureFormat.RG16, false);
            for (int i = 0; i < Textures.Count; i++)
            {
                var tex = Textures[i];
                var info = OriginTexture2TextureInfo[tex];
                offsetTex.SetPixel(i, 0, new Color(info.Offset.x, info.Offset.y, 0));
            }

            var path = EditorUtility.SaveFilePanelInProject("保存offset图", "OffsetMap", "png", "");
            File.WriteAllBytes(path, offsetTex.EncodeToPNG());
        }
    }

}