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类似于许多采用平铺地图的程序，如游戏泰拉瑞亚中的那样，并将地图变成整个地图的单张图片，我正在尝试做类似的事情。问题是，我的块纹理位于单个大型纹理图集中并由索引引用，并且我无法从单个块中获取颜色数据并将其放置在较大纹理中的正确位置。

到目前为止，这是我的代码。

从索引中获取源代码（此代码有效）：

public static Rectangle GetSourceForIndex(int index, Texture2D tex)
    {
        int dim = tex.Width / TEXTURE_MAP_DIM;

        int startx = index % TEXTURE_MAP_DIM;
        int starty = index / TEXTURE_MAP_DIM;

        return new Rectangle(startx * dim, starty * dim, dim, dim);
    }

在索引处获取纹理（问题开始的地方）：

public static Texture2D GetTextureAtIndex(int index, Texture2D tex)
    {
        Rectangle source = GetSourceForIndex(index, tex);
        Texture2D texture = new Texture2D(_device, source.Width, source.Height);

        Color[] colors = new Color[tex.Width * tex.Height];
        tex.GetData<Color>(colors);
        Color[] colorData = new Color[source.Width * source.Height];

        for (int x = 0; x < source.Width; x++)
        {
            for (int y = 0; y < source.Height; y++)
            {
                colorData[x + y * source.Width] = colors[x + source.X + (y + source.Y) * tex.Width];
            }
        }

        texture.SetData<Color>(colorData);
        return texture;
    }

将纹理放入更大的图片中（我敢肯定这是完全错误的）：

private void doSave()
    {
        int texWidth = this._rWidth * Region.REGION_DIM * 16;
        int texHeight = this._rHeight * Region.REGION_DIM * 16;

        Texture2D picture = new Texture2D(Game.GraphicsDevice, texWidth, texHeight);
        Color[] pictureData = new Color[picture.Width * picture.Height];

        for (int blockX = 0; blockX < texWidth / 16; blockX++)
        {
            for (int blockY = 0; blockY < texHeight / 16; blockY++)
            {
                Block b = this.GetBlockAt(blockX, blockY);
                Texture2D toCopy = TextureManager.GetTextureAtIndex(b.GetIndexBasedOnMetadata(b.GetMetadataForSurroundings(this, blockX, blockY)), b.GetTextureFile());
                Color[] copyData = new Color[toCopy.Width * toCopy.Height];
                Rectangle source = new Rectangle(blockX * 16, blockY * 16, 16, 16);
                toCopy.GetData<Color>(copyData);

                for (int x = 0; x < source.Width; x++)
                {
                    for (int y = 0; y < source.Height; y++)
                    {
                        pictureData[x + source.X + (y + source.Y) * picture.Width] = copyData[x + y * source.Width];
                    }
                }
            }
        }

        picture.SetData<Color>(pictureData);

        string fileName = "picture" + DateTime.Now.ToString(@"MM\-dd\-yyyy-h\-mm-tt");
        FileStream stream = File.Open(this.GetSavePath() + @"Pictures\" + fileName, FileMode.OpenOrCreate);
        picture.SaveAsPng(stream, picture.Width, picture.Height);

我找不到关于如何在纹理和一维颜色数组之间正确转换的任何好的描述。如果我知道如何轻松、正确地将正方形颜色放入更大的二维纹理中，那就容易多了。

TL;DR：如何将较小的纹理放入较大的纹理中？

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1 回答 1

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创建一个与您最大纹理大小相同的 RenderTarget2D 并将其设置为活动。画大纹理，然后画小纹理。将对原始纹理的引用设置为您刚刚绘制到的 RenderTarget2D。

int texWidth = this._rWidth * Region.REGION_DIM * 16;
int texHeight = this._rHeight * Region.REGION_DIM * 16;

_renderTarget = new RenderTarget2D(GraphicsDevice, texWidth, texHeight);
GraphicsDevice.SetRenderTarget(_renderTarget);
GraphicsDevice.Clear(Color.Transparent);

_spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque);

for (int blockX = 0; blockX < texWidth / 16; blockX++)
{
    for (int blockY = 0; blockY < texHeight / 16; blockY++)
    {
         _spriteBatch.Draw(
            TextureManager.GetTextureAtIndex(b.GetIndexBasedOnMetadata(b.GetMetadataForSurroundings(this, blockX, blockY)), b.GetTextureFile()), 
         new Rectangle(blockX * 16, blockY * 16, 16, 16), 
         Color.White);
     }
}

_spriteBatch.End()

GraphicsDevice.SetRenderTarget(null);
var picture = _renderTarget;
于 2013-04-26T09:32:29.423 回答