更改 RenderTarget 会导致紫屏吗？

发布于 2024-09-10 14:29:26 字数 743 浏览 9 评论 0原文

我试图在运行时更改 RenderTargets，因此我可以在运行时绘制一些元素，操作它们，然后最终将纹理绘制到屏幕上。问题是，如果我在运行时更改 RenderTarget，屏幕会变成紫色。这是我在 Draw 中得到的代码：

        RenderTarget2D tempTarget = new RenderTarget2D(GraphicsDevice, 128, 128, 1,
            GraphicsDevice.DisplayMode.Format, GraphicsDevice.PresentationParameters.MultiSampleType,
            GraphicsDevice.PresentationParameters.MultiSampleQuality, RenderTargetUsage.PreserveContents);

        GraphicsDevice.SetRenderTarget(0, tempTarget);
        GraphicsDevice.Clear(ClearOptions.Target, Color.SpringGreen, 0, 0);
        GraphicsDevice.SetRenderTarget(0, null);

如果我在运行时创建 RenderTarget（并且我确实需要在运行时创建内存中纹理并使用 SpriteBatch 在它们上绘制），那么如何创建 RenderTarget 似乎并不重要结果是完全紫色的屏幕。我可以做什么来解决这个问题？

原文

I'm attempting to change RenderTargets at runtime, so I can draw some elements at runtime, manipulate them and then finally draw the texture to the screen. Problem is, the screen turns purple if I change the RenderTarget at runtime. Here's the code I've got in Draw:

        RenderTarget2D tempTarget = new RenderTarget2D(GraphicsDevice, 128, 128, 1,
            GraphicsDevice.DisplayMode.Format, GraphicsDevice.PresentationParameters.MultiSampleType,
            GraphicsDevice.PresentationParameters.MultiSampleQuality, RenderTargetUsage.PreserveContents);

        GraphicsDevice.SetRenderTarget(0, tempTarget);
        GraphicsDevice.Clear(ClearOptions.Target, Color.SpringGreen, 0, 0);
        GraphicsDevice.SetRenderTarget(0, null);

It doesn't seem to matter how I create the RenderTarget, if I do it at runtime (and I do need to create in-memory textures at runtime and draw on them with SpriteBatch) it results in an entirely purple screen. What can I do to fix this?

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〆凄凉。 2024-09-17 14:29:26

看起来最好的选择是在 Draw 之外的其他地方创建 RenderTarget，在 Update 期间绘制到它，保存生成的纹理（并根据需要进行操作），然后在 Draw 期间绘制该纹理。

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蓝咒 2024-09-17 14:29:26

我知道这已经晚了，但解决方案是在清除屏幕并开始绘制其他项目之前写入 RenderTarget。

protected override void Draw(GameTime gameTime)
{
     GraphicsDevice.SetRenderTarget(_renderTarget);

     //...
     //Perform Rendering to the specified target
     //...

     GraphicsDevice.SetRenderTarget(null);

     GraphicsDevice.Clear(Color.CornflowerBlue);

     //...
     //Code that draws to the users screen goes here
     //...
}

这应该会阻止您按照其他人的建议在 Update 方法中进行渲染，这在很多方面都是违反直觉的。

I know this is late, but the solution is to write to the RenderTarget BEFORE you clear the screen and beginning drawing your other items.

protected override void Draw(GameTime gameTime)
{
     GraphicsDevice.SetRenderTarget(_renderTarget);

     //...
     //Perform Rendering to the specified target
     //...

     GraphicsDevice.SetRenderTarget(null);

     GraphicsDevice.Clear(Color.CornflowerBlue);

     //...
     //Code that draws to the users screen goes here
     //...
}

This should prevent you from rendering in the Update method as suggested by others, which is counter-intuitive in many aspects.

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