using UnityEngine;

public class TileTextureGenerator : MonoBehaviour
{
    public Texture2D[] tileTextures; // 瓷砖贴图数组
    public int tileRows = 3; // 平铺行数
    public int tileCols = 3; // 平铺列数
    public Material targetMaterial; // 目标材质

    void Start()
    {
        if (tileTextures == null || tileTextures.Length == 0)
        {
            Debug.LogError("请设置瓷砖贴图数组！");
            return;
        }

        if (targetMaterial == null)
        {
            Debug.LogError("请设置目标材质！");
            return;
        }

        GenerateTiledTexture();
    }

    void GenerateTiledTexture()
    {
        // 获取第一张瓷砖贴图的尺寸
        int tileWidth = tileTextures[0].width;
        int tileHeight = tileTextures[0].height;

        // 计算目标贴图尺寸
        int targetWidth = tileWidth * tileCols;
        int targetHeight = tileHeight * tileRows;

        // 创建目标贴图
        Texture2D targetTexture = new Texture2D(targetWidth, targetHeight);

        // 循环平铺
        for (int row = 0; row < tileRows; row++)
        {
            for (int col = 0; col < tileCols; col++)
            {
                // 计算当前瓷砖在目标贴图上的起始位置
                int x = col * tileWidth;
                int y = row * tileHeight;

                // 选择要使用的瓷砖贴图（这里简单地循环使用数组中的贴图）
                Texture2D currentTile = tileTextures[(row * tileCols + col) % tileTextures.Length];

                // 将当前瓷砖贴图复制到目标贴图
                for (int i = 0; i < tileWidth; i++)
                {
                    for (int j = 0; j < tileHeight; j++)
                    {
                        targetTexture.SetPixel(x + i, y + j, currentTile.GetPixel(i, j));
                    }
                }
            }
        }

        // 应用更改并生成 Mipmap
        targetTexture.Apply();

        // 将生成的贴图应用到目标材质
        targetMaterial.mainTexture = targetTexture;
    }
}