Unity中如何计算带minimap的贴图资源的大小

/// <summary>/// 计算贴图大小,包含mipmap内存的叠加/// </summary>/// <param name="tTexture"></param>/// <returns></returns>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;}/// <summary>/// 计算贴图大小,包含mipmap内存的叠加,指定贴图格式/// </summary>/// <param name="tTexture"></param>/// <returns></returns>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;}/// <summary>/// 获取对应个是贴图的位大小/// </summary>/// <param name="format"></param>/// <returns></returns>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 formatreturn 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 formatreturn 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 camerareturn 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 formatreturn 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 formatreturn 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;}

 

转载于:https://www.cnblogs.com/hengsoft/p/10289647.html

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