Unity 如何獲取Texture 的記憶體大小

在Unity中，要獲取Texture的記憶體文件大小，可以使用UnityEditor.TextureUtil類中的一些函數。這些函數提供了獲取存儲記憶體大小和運行時記憶體大小的方法。由於UnityEditor.TextureUtil是一個內部類，我們需要使用反射來訪問它。

步驟

1. 導入UnityEditor命名空間和System.Reflection命名空間：

using UnityEditor;
using System.Reflection;

2. 創建一個函數來獲取Texture的記憶體文件大小：

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

    // 使用反射獲取UnityEditor.TextureUtil類的Type
    Type textureUtilType = typeof(TextureImporter).Assembly.GetType("UnityEditor.TextureUtil");

    // 使用反射獲取UnityEditor.TextureUtil類的GetStorageMemorySizeLong方法
    MethodInfo getStorageMemorySizeLongMethod = textureUtilType.GetMethod("GetStorageMemorySizeLong", BindingFlags.Static | BindingFlags.Public);

    // 調用GetStorageMemorySizeLong方法獲取存儲記憶體大小
    fileSize = (long)getStorageMemorySizeLongMethod.Invoke(null, new object[] { texture });

    return fileSize;
}

3. 創建一個函數來獲取Texture的運行時記憶體大小：

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

    // 使用反射獲取UnityEditor.TextureUtil類的Type
    Type textureUtilType = typeof(TextureImporter).Assembly.GetType("UnityEditor.TextureUtil");

    // 使用反射獲取UnityEditor.TextureUtil類的GetRuntimeMemorySizeLong方法
    MethodInfo getRuntimeMemorySizeLongMethod = textureUtilType.GetMethod("GetRuntimeMemorySizeLong", BindingFlags.Static | BindingFlags.Public);

    // 調用GetRuntimeMemorySizeLong方法獲取運行時記憶體大小
    memorySize = (long)getRuntimeMemorySizeLongMethod.Invoke(null, new object[] { texture });

    return memorySize;
}

示例代碼

示例 1：獲取Texture的存儲記憶體大小

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：獲取Texture的運行時記憶體大小

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：同時獲取Texture的存儲記憶體大小和運行時記憶體大小

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;
    }
}

註意事項

• 確保在使用反射訪問UnityEditor.TextureUtil類之前，已經導入了UnityEditor命名空間和System.Reflection命名空間。
• 使用反射時，需要使用BindingFlags.Static | BindingFlags.Public來獲取靜態公共方法。
• 在示例代碼中，我們使用了Texture2D類型的變數來表示Texture，你可以根據實際情況修改代碼以適應不同的Texture類型。

__EOF__