Unity 如何获取Texture 的内存大小

在Unity中，要获取Texture的内存文件大小，可以使用UnityEditor.TextureUtil类中的一些函数。这些函数提供了获取存储内存大小和运行时内存大小的方法。由于UnityEditor.TextureUtil是一个内部类，我们需要使用反射来访问它。

1. 导入UnityEditor命名空间和System.Reflection命名空间：

   using UnityEditor;
   using System.Reflection;

2. 创建一个函数来获取Texture的内存文件大小：

   public static long GetTextureFileSize(Texture2D texture)
   {
   long fileSize = 0;

   // 使用反射获取UnityEditor.TextureUtil类的Type
   Type textureUtilType = typeof(TextureImporter).Assembly.GetType("UnityEditor.TextureUtil");
   
   // 使用反射获取UnityEditor.TextureUtil类的GetStorageMemorySizeLong方法
   MethodInfo getStorageMemorySizeLongMethod = textureUtilType.GetMethod("GetStorageMemorySizeLong", BindingFlags.Static | BindingFlags.Public);
   
   // 调用GetStorageMemorySizeLong方法获取存储内存大小
   fileSize = (long)getStorageMemorySizeLongMethod.Invoke(null, new object[] { texture });
   
   return fileSize;

   }

3. 创建一个函数来获取Texture的运行时内存大小：

   public static long GetTextureRuntimeMemorySize(Texture2D texture)
   {
   long memorySize = 0;

   // 使用反射获取UnityEditor.TextureUtil类的Type
   Type textureUtilType = typeof(TextureImporter).Assembly.GetType("UnityEditor.TextureUtil");
   
   // 使用反射获取UnityEditor.TextureUtil类的GetRuntimeMemorySizeLong方法
   MethodInfo getRuntimeMemorySizeLongMethod = textureUtilType.GetMethod("GetRuntimeMemorySizeLong", BindingFlags.Static | BindingFlags.Public);
   
   // 调用GetRuntimeMemorySizeLong方法获取运行时内存大小
   memorySize = (long)getRuntimeMemorySizeLongMethod.Invoke(null, new object[] { texture });
   
   return memorySize;

   }

示例 1：获取Texture的存储内存大小

using UnityEngine;
using UnityEditor;
using System.Reflection;

public class TextureSizeExample : MonoBehaviour
{
    [SerializeField]
    private Texture2D texture;

    private void Start()
    {
        long fileSize = GetTextureFileSize(texture);
        Debug.Log("Texture File Size: " + fileSize + " bytes");
    }

    private static long GetTextureFileSize(Texture2D texture)
    {
        long fileSize = 0;

        Type textureUtilType = typeof(TextureImporter).Assembly.GetType("UnityEditor.TextureUtil");
        MethodInfo getStorageMemorySizeLongMethod = textureUtilType.GetMethod("GetStorageMemorySizeLong", BindingFlags.Static | BindingFlags.Public);
        fileSize = (long)getStorageMemorySizeLongMethod.Invoke(null, new object[] { texture });

        return fileSize;
    }
}

示例 2：获取Texture的运行时内存大小

using UnityEngine;
using UnityEditor;
using System.Reflection;

public class TextureSizeExample : MonoBehaviour
{
    [SerializeField]
    private Texture2D texture;

    private void Start()
    {
        long memorySize = GetTextureRuntimeMemorySize(texture);
        Debug.Log("Texture Runtime Memory Size: " + memorySize + " bytes");
    }

    private static long GetTextureRuntimeMemorySize(Texture2D texture)
    {
        long memorySize = 0;

        Type textureUtilType = typeof(TextureImporter).Assembly.GetType("UnityEditor.TextureUtil");
        MethodInfo getRuntimeMemorySizeLongMethod = textureUtilType.GetMethod("GetRuntimeMemorySizeLong", BindingFlags.Static | BindingFlags.Public);
        memorySize = (long)getRuntimeMemorySizeLongMethod.Invoke(null, new object[] { texture });

        return memorySize;
    }
}

示例 3：同时获取Texture的存储内存大小和运行时内存大小

using UnityEngine;
using UnityEditor;
using System.Reflection;

public class TextureSizeExample : MonoBehaviour
{
    [SerializeField]
    private Texture2D texture;

    private void Start()
    {
        long fileSize = GetTextureFileSize(texture);
        long memorySize = GetTextureRuntimeMemorySize(texture);

        Debug.Log("Texture File Size: " + fileSize + " bytes");
        Debug.Log("Texture Runtime Memory Size: " + memorySize + " bytes");
    }

    private static long GetTextureFileSize(Texture2D texture)
    {
        long fileSize = 0;

        Type textureUtilType = typeof(TextureImporter).Assembly.GetType("UnityEditor.TextureUtil");
        MethodInfo getStorageMemorySizeLongMethod = textureUtilType.GetMethod("GetStorageMemorySizeLong", BindingFlags.Static | BindingFlags.Public);
        fileSize = (long)getStorageMemorySizeLongMethod.Invoke(null, new object[] { texture });

        return fileSize;
    }

    private static long GetTextureRuntimeMemorySize(Texture2D texture)
    {
        long memorySize = 0;

        Type textureUtilType = typeof(TextureImporter).Assembly.GetType("UnityEditor.TextureUtil");
        MethodInfo getRuntimeMemorySizeLongMethod = textureUtilType.GetMethod("GetRuntimeMemorySizeLong", BindingFlags.Static | BindingFlags.Public);
        memorySize = (long)getRuntimeMemorySizeLongMethod.Invoke(null, new object[] { texture });

        return memorySize;
    }
}

• 确保在使用反射访问UnityEditor.TextureUtil类之前，已经导入了UnityEditor命名空间和System.Reflection命名空间。
• 使用反射时，需要使用BindingFlags.Static | BindingFlags.Public来获取静态公共方法。
• 在示例代码中，我们使用了Texture2D类型的变量来表示Texture，你可以根据实际情况修改代码以适应不同的Texture类型。