问题

unity中创建新的shader时，不能直接创建自定义的shader模板，每次都需要替换

创建新的自定义shader

• 需求：创建新的shader时，不能直接创建自定义的shader模板，每次都需要替换

• 解决之道：写入一个shader 模板信息到stream并写入到Asset中，随后再自定义一个菜单按钮来创建shader

• 实现

  using UnityEngine;
  using UnityEditor;
  using System;
  using System.IO;
  using System.Text;
  using UnityEditor.ProjectWindowCallback;
  using System.Text.RegularExpressions;
  
  public class ElysiaCreateShader
  {
    public const string m_PBRShaderTemplatePath = "Assets/Materials/PBR/S_PBR.shader";
  
    [MenuItem("Assets/Create/Elysia/PBR Shader")]
    public static void CreateShaderTemplate()
    {
        // 资源重命名
        ProjectWindowUtil.StartNameEditingIfProjectWindowExists(0,
            ScriptableObject.CreateInstance<ElysiaShaderAsset>(),
            GetSelectedDirectoryPath() + "/S_PBR.shader",
            null,
            m_PBRShaderTemplatePath
            ); 
    }
  
    // 获取文件夹路径
    public static string GetSelectedDirectoryPath()
    {
        string path = "";
  
        // 获取选中物体的路径
        foreach (UnityEngine.Object obj in Selection.GetFiltered(typeof(UnityEngine.Object), SelectionMode.Assets))
        {
            path = AssetDatabase.GetAssetPath(obj);
            if (!string.IsNullOrEmpty(path) && File.Exists(path))
            {
                path = Path.GetDirectoryName(path);
            }
        }
  
        return path;
    }
  
  
  }
  
  class ElysiaShaderAsset : EndNameEditAction
  {
    public override void Action(int instanceId, string pathName, string resourceFile)
    {
        UnityEngine.Object o = CreateAssetFromTemplate(pathName, resourceFile);
        ProjectWindowUtil.ShowCreatedAsset(o);  // 在Inspector视图中自动打开并选中
    }
  
    static UnityEngine.Object CreateAssetFromTemplate(string pathName, string resourceFile)
    {
        string fullPathName = Path.GetFullPath(pathName);
  
        // 读取shader模板内容
        StreamReader streamReader = new StreamReader(resourceFile);
        string text = streamReader.ReadToEnd();
        streamReader.Close();
  
        string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(pathName);   // 去除文件后缀名
        text = Regex.Replace(text, "#NAME#", fileNameWithoutExtension); // 把模板的#NAME#替换为文件名
  
        // 编码UTF8
        bool bEncoderShouldEmitUTF8Identifier = true;
        bool bThrowOnInvalidBytes = false;
        UTF8Encoding utf8Encoding = new UTF8Encoding(bEncoderShouldEmitUTF8Identifier, bThrowOnInvalidBytes);
  
        // 写入文件
        bool append = false;    // 全部重写
        StreamWriter streamWriter = new StreamWriter(fullPathName, append, utf8Encoding);
        streamWriter.Write(text);
        streamWriter.Close();
  
        // 导入Asset
        AssetDatabase.ImportAsset(pathName);
        return AssetDatabase.LoadAssetAtPath(pathName, typeof(UnityEngine.Object));
    }
  }