/// 
    /// 计算贴图大小,包含mipmap内存的叠加    /// 
    ///     /// 
         public static int CalculateTextureSizeBytes(Texture tTexture)    {        int tWidth = tTexture.width;        int tHeight = tTexture.height;        if (tTexture is Texture2D)        {            Texture2D tTex2D = tTexture as Texture2D;            int bitsPerPixel = GetBitsPerPixel(tTex2D.format);            int mipMapCount = tTex2D.mipmapCount;            int mipLevel = 1;            int tSize = 0;            while (mipLevel <= mipMapCount)            {                tSize += tWidth * tHeight * bitsPerPixel / 8;                tWidth = tWidth / 2;                tHeight = tHeight / 2;                mipLevel++;            }            return tSize;        }        return 0;    }    /// 
    /// 计算贴图大小,包含mipmap内存的叠加,指定贴图格式    /// 
    ///     /// 
         public static int CalculateTextureSizeBytesByFormat(Texture tTexture, TextureImporterFormat format)    {        int tWidth = tTexture.width;        int tHeight = tTexture.height;        if (tTexture is Texture2D)        {            Texture2D tTex2D = tTexture as Texture2D;            if (TextureImporterFormat.Automatic == format)            {                Debug.LogError("------------------>有贴图格式未设置: 贴图名称:" + tTexture.name);            }            int bitsPerPixel = GetBitsPerPixelForImportFormat(format);            int mipMapCount = tTex2D.mipmapCount;            int mipLevel = 1;            int tSize = 0;            while (mipLevel <= mipMapCount)            {                tSize += tWidth * tHeight * bitsPerPixel / 8;                tWidth = tWidth / 2;                tHeight = tHeight / 2;                mipLevel++;            }            return tSize;        }        return 0;    }    /// 
    /// 获取对应个是贴图的位大小    /// 
    ///     /// 
         public static int GetBitsPerPixel(TextureFormat format)    {        switch (format)        {            case TextureFormat.Alpha8: //     Alpha-only texture format.                return 8;            case TextureFormat.ARGB4444: //     A 16 bits/pixel texture format. Texture stores color with an alpha channel.                return 16;            case TextureFormat.RGBA4444: //     A 16 bits/pixel texture format.                return 16;            case TextureFormat.RGB24:   // A color texture format.                return 24;            case TextureFormat.RGBA32:  //Color with an alpha channel texture format.                return 32;            case TextureFormat.ARGB32:  //Color with an alpha channel texture format.                return 32;            case TextureFormat.RGB565:  //     A 16 bit color texture format.                return 16;            case TextureFormat.DXT1:    // Compressed color texture format.                return 4;            case TextureFormat.DXT5:    // Compressed color with alpha channel texture format.                return 8;            case TextureFormat.PVRTC_RGB2://     PowerVR (iOS) 2 bits/pixel compressed color texture format.                return 2;            case TextureFormat.PVRTC_RGBA2://     PowerVR (iOS) 2 bits/pixel compressed with alpha channel texture format                return 2;            case TextureFormat.PVRTC_RGB4://     PowerVR (iOS) 4 bits/pixel compressed color texture format.                return 4;            case TextureFormat.PVRTC_RGBA4://     PowerVR (iOS) 4 bits/pixel compressed with alpha channel texture format                return 4;            case TextureFormat.ETC_RGB4://     ETC (GLES2.0) 4 bits/pixel compressed RGB texture format.                return 4;            case TextureFormat.ETC2_RGBA8://     ATC (ATITC) 8 bits/pixel compressed RGB texture format.                return 8;            case TextureFormat.BGRA32://     Format returned by iPhone camera                return 32;        }        return 0;    }    public static int GetBitsPerPixelForImportFormat(TextureImporterFormat format)    {        switch (format)        {            case TextureImporterFormat.Alpha8: //     Alpha-only texture format.                return 8;            case TextureImporterFormat.RGB24:   // A color texture format.                return 24;            case TextureImporterFormat.RGBA32:  //Color with an alpha channel texture format.                return 32;            case TextureImporterFormat.ARGB32:  //Color with an alpha channel texture format.                return 32;            case TextureImporterFormat.RGBA16:  //     A 16 bit color texture format.                return 16;            case TextureImporterFormat.RGB16:  //     A 16 bit color texture format.                return 16;            case TextureImporterFormat.DXT1:    // Compressed color texture format.                return 4;            case TextureImporterFormat.DXT5:    // Compressed color with alpha channel texture format.                return 8;            case TextureImporterFormat.PVRTC_RGB2://     PowerVR (iOS) 2 bits/pixel compressed color texture format.                return 2;            case TextureImporterFormat.PVRTC_RGBA2://     PowerVR (iOS) 2 bits/pixel compressed with alpha channel texture format                return 2;            case TextureImporterFormat.PVRTC_RGB4://     PowerVR (iOS) 4 bits/pixel compressed color texture format.                return 4;            case TextureImporterFormat.PVRTC_RGBA4://     PowerVR (iOS) 4 bits/pixel compressed with alpha channel texture format                return 4;            case TextureImporterFormat.ETC_RGB4://     ETC (GLES2.0) 4 bits/pixel compressed RGB texture format.                return 4;            case TextureImporterFormat.ETC2_RGB4://     ETC (GLES3.0) 4 bits/pixel compressed RGB texture format.                return 4;            case TextureImporterFormat.ETC2_RGBA8://     ETC (GLES3.0) 8 bits/pixel compressed RGBA texture format.                return 8;            case TextureImporterFormat.Automatic://     没有设置贴图格式，默认给4bit.                return 4;        }        return 0;    }