(XNA) 切换渲染目标会导致性能下降

发布于 2024-12-27 22:52:58 字数 818 浏览 1 评论 0原文

我有以下问题。我尝试使用 Stencil、AlphaTestEffect 和 RenderTarget 剪切部分纹理，但这对我造成了巨大的性能影响。如果没有它，我的帧率接近 30 fps，而有了它，它会下降到 4 fps。

我试图隔离问题的根源，在处理它时，我注意到即使我什么都不做，但将活动渲染目标切换到我的自定义渲染目标，然后如果我将其切换回 backBuffer，我的fps 下降接近 10fps。我所做的就是这样：

            graphicsDevice.SetRenderTarget(renderTargetA);
            graphicsDevice.SetRenderTarget(null);

虽然渲染目标是这样创建的：

        renderTargetA = new RenderTarget2D(KnightGame.CurrentGame.ScreenManager.GraphicsDevice, 800, 480,
                                           false, SurfaceFormat.Color, DepthFormat.Depth24Stencil8,
                                           0, RenderTargetUsage.PreserveContents);

我尝试使用不同大小的 DiscardContents，但它总是会降低 fps。我评论了与切断图像部分有关的所有部分，并且仍然只是切换渲染目标，这对性能造成了影响。有人可以指导我找出这个问题的原因吗？

卢卡斯

原文

I have the following problem. I'm trying to cut parts of the texture using the Stencil, AlphaTestEffect and RenderTarget, but this causes a huge performance hit for me. Without it, I have close to 30fps, while with it, it drops to 4fps.

I was trying to isolate the root of the problem, and while with it, I noticed that even if I do nothing, but switch the active render target to my custom render target, and then right afterwards if I switch it back to backBuffer, my fps drops by close to 10fps's. All I do is this:

            graphicsDevice.SetRenderTarget(renderTargetA);
            graphicsDevice.SetRenderTarget(null);

While the render target is created that way:

        renderTargetA = new RenderTarget2D(KnightGame.CurrentGame.ScreenManager.GraphicsDevice, 800, 480,
                                           false, SurfaceFormat.Color, DepthFormat.Depth24Stencil8,
                                           0, RenderTargetUsage.PreserveContents);

I tried using DiscardContents, different sizes, but it always drops the fps. I commented all the parts that have to do with cutting off the part of the image and still just with switching the render target it makes a hit to the performance. Can anybody direct me to the cause of this problem?

Lucas

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