Question

我有一些代码如下：

        GraphicsDevice.SetRenderTarget(0, myRenderTarget);
        GraphicsDevice.Clear(Color.Black);
        spriteBatch.Begin(SpriteBlendMode.AlphaBlend, SpriteSortMode.Immediate, SaveStateMode.None);
        myEffect.Begin();
        myEffectCurrentTechnique.Passes[0].Begin();
        spriteBatch.Draw(aRegularTexture, Vector2.Zero, Color.White);
        spriteBatch.End();
        myEffect.CurrentTechnique.Passes[0].End();
        myEffect.End();
        GraphicsDevice.SetRenderTarget(0, backBuffer);
        Texture2D bloomTexture = myRenderTarget.GetTexture();
        ...
        GraphicsDevice.SetRenderTarget(0, myRenderTarget);
        GraphicsDevice.Clear(Color.Black);
        spriteBatch.Begin();
        spriteBatch.Draw(aRegularTexture, Vector2.Zero, Color.White);
        spriteBatch.End();
        GraphicsDevice.SetRenderTarget(0, backBuffer);
        aRegularTexture = myRenderTarget.GetTexture(); 
        //SHOULD be doing nothing, since I'm just rendering said texture into a render target and pulling it back out

（注意：这被修剪为最小的再现代码，而不是我实际使用的）

如果我在第二段代码之前将aRegularTexture渲染到屏幕上，它看起来很好并且不受影响。但是如果我在第二个代码块之后将其渲染出来，它就会被设置为aModifiedTexture的内容，即使我从未做过任何导致这种情况的事情。为什么？（使用XNA 3.1）

Answer 1

通过Shawn Hargreaves：“GetTexture返回与rendertarget本身相同的表面内存的别名，而不是单独的数据副本”

http://blogs.msdn.com/b/shawnhar/archive/2010/03/26/rendertarget-changes-in-xna-game-studio-4-0.aspx

重用渲染目标“溢出油漆”？

1 个答案: