使用窗口系统 (GLX) 交换缓冲区和清除返回 [英] Swap Buffers and Clear Back using windowing system (GLX)
问题描述
在后台缓冲区和前台缓冲区之间交换时，后台缓冲区中的内容变得不确定.我想使用窗口系统"来定义它，例如 GLX、EGL、WGL.使用诸如 OpenGL (glClear) 之类的本机"渲染器是我的备用计划，别费心提了.它是备份的原因是因为我不想弄乱本机渲染上下文.对于这个问题，我将坚持使用 X/GLX，但如果您想描述如何在其他环境中执行此操作，请继续.
When swapping between back and front buffers the content in the back buffer becomes undefined. I´d like to define it using the "windowing system", such as GLX, EGL, WGL. Using "native" renderer such as OpenGL (glClear) is my backup plan, don´t bother mentioning it. The reason it is backup is because I don´t want to mess with native rendering contexts. I´ll stick to X/GLX for this question but if you feel inclined to describe how to do it in other Environments then go ahead.
来自 Xlib 文档(http://www.x.org/docs/X11/xlib.pdf) 我找到了一个操作，XClearWindow，用于清除带有背景像素"的窗口(顺便说一句，这个名字很棒......不是).
From the Xlib documentation (http://www.x.org/docs/X11/xlib.pdf) I find an operation, XClearWindow, for clearing window with "background pixel" (awesome name by the way... not).
- XClearWindow 是清除前/后缓冲区还是清除两个缓冲区?我想后备缓冲是有道理的，但我无法仅从 Xlib 文档中弄清楚...如果有人问起三重缓冲，那不是我！
- 它是否与 OpenGL 渲染同步，或者我是否必须通过例如在操作前调用 glxWaitGL 来同步自己?
- 命令是否阻塞，即停止直到完成?依赖于实现?
有关如何在使用窗口系统 (GLX) 进行交换后清除后台缓冲区的其他建议.
Other suggestions as how to clear the back buffer after a swap using windowing system (GLX) is appriciated.
干杯！
推荐答案
在后台缓冲区和前台缓冲区之间交换时，后台缓冲区中的内容变得不确定.
When swapping between back and front buffers the content in the back buffer becomes undefined.
是的，这是一件好事.
我想使用窗口系统"来定义它，例如 GLX、EGL、WGL
I´d like to define it using the "windowing system", such as GLX, EGL, WGL
为什么?除此之外，这样做是未定义的，因为交换后的背景不会有任何好处.
Why? Apart from that doing this is just as undefined, as the background after a swap nothing good will come from it.
如果 OpenGL DDX 知道它将同步的 XClearWindow，它充其量只会降低性能.在最坏的情况下，您会引入一个竞争条件，结果是不可预测的.
At best it will just degrade performance if the OpenGL DDX is aware of the XClearWindow it will sync. At worst you're introducing a race condition between which the results are unpredicatable.
有关如何在使用窗口系统 (GLX) 进行交换后清除后台缓冲区的其他建议.
Other suggestions as how to clear the back buffer after a swap using windowing system (GLX) is appriciated.
使用正确的 OpenGL 操作:glClear(…).
Use the proper OpenGL operation: glClear(…).
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