Texture2D.GetData方法的解决方法 [英] Workaround for Texture2D.GetData method

问题描述

我正在使用Monogame将游戏从XNA转换为iOS。

在下面的代码段中， smallDeform 是 Texture2D 我在其上调用 GetData 方法。

I’m converting a game from XNA to iOS with Monogame.
In the code snippet below, smallDeform is a Texture2D on which I call the GetData method.

smallDeform = Game.Content.Load<Texture2D>("Terrain/...");
smallDeform.GetData(smallDeformData, 0, smallDeform.Width * smallDeform.Height);

我在使用Monogame时遇到一些问题，因为iOS中的功能尚未实现，因为它返回这个例外。

I’m having some problem with Monogame because the feature in iOS has not been implemented yet because it returns this exception.

#if IOS 
   throw new NotImplementedException();
#elif ANDROID

我试图将来自Windows的XML文件中的数据序列化为加载来自iOS的整个文件。序列化文件每个重量超过100MB，这是非常不能解析的。

I tried to serialize the data in a XML file from Windows to load the whole file from iOS. The serialized files weight more than 100MB each, that is quite unacceptable to parse.

基本上，我正在寻找一种解决方法来获取数据（例如 uint [] 或 Color [] ）来自纹理而不使用 GetData 方法。

Basically, I’m looking for a workaround to get the data (for instance a uint[] or Color[]) from a texture without using the GetData method.

PS：我在Mac上，所以我不能使用Monogame SharpDX库。

PS: I'm on Mac, so I can't use the Monogame SharpDX library.

谢谢事先。

推荐答案

我回答我自己的问题，如果有人会遇到同样的问题。

I answer my own question, if someone will have the same problem.

按照 craftworkgame 的建议，我使用字节流保存了数据，但由于缺少 File 类，我不得不使用WinRT函数：

Following craftworkgame's suggestion, I saved my data using byte streams, but due to the absence of File class, I had to use WinRT functions:

private async void SaveColorArray(string filename, Color[] array)
{
    StorageFile sampleFile = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFileAsync(filename + ".dat", CreationCollisionOption.ReplaceExisting);
    IRandomAccessStream writeStream = await sampleFile.OpenAsync(FileAccessMode.ReadWrite);
    IOutputStream outputSteam = writeStream.GetOutputStreamAt(0);
    DataWriter dataWriter = new DataWriter(outputSteam);
    for (int i = 0; i < array.Length; i++)
    {
        dataWriter.WriteByte(array[i].R);
        dataWriter.WriteByte(array[i].G);
        dataWriter.WriteByte(array[i].B);
        dataWriter.WriteByte(array[i].A);
    }

    await dataWriter.StoreAsync();
    await outputSteam.FlushAsync();
}

protected async Task<Color[]> LoadColorArray(string filename)
{
    StorageFile sampleFile = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFileAsync(filename + ".dat", CreationCollisionOption.OpenIfExists);
    IRandomAccessStream readStream = await sampleFile.OpenAsync(FileAccessMode.Read);
    IInputStream inputSteam = readStream.GetInputStreamAt(0);
    DataReader dataReader = new DataReader(inputSteam);
    await dataReader.LoadAsync((uint)readStream.Size);

    Color[] levelArray = new Color[dataReader.UnconsumedBufferLength / 4];
    int i = 0;
    while (dataReader.UnconsumedBufferLength > 0)
    {
        byte[] colorArray = new byte[4];
        dataReader.ReadBytes(colorArray);
        levelArray[i++] = new Color(colorArray[0], colorArray[1], colorArray[2], colorArray[3]);
    }

    return levelArray;
}

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