Linux wayland-weston 注意点

1. 可选的环境变量，这将为您获得更多的调试输出：

export MESA_DEBUG=1

export EGL_LOG_LEVEL=debug

export LIBGL_DEBUG=verbose

export WAYLAND_DEBUG=1

2.  运行egl程序时，帧率不高，可以设置 vblank_mode=0 tells the graphic card to ignore the refresh rate of your monitor and just try to reach the maximux fps it's capable off.

You usually don't want this, because it causes tearing and wastes battery life without any benefits (you can't view more then, in your case, 60fps because your monitor isn't able to change what's displaying more than 60 times every second).

You might sometimes want this (in online shooters such as cs:go for example) because otherwise you will have a lot of input lag. It's a trade-off, input lag vs. screen tearing.

I think optirun sets vblank_mode=0 by default, so it doesn't change whether you specify it or not. primusrun doesn't and it too caps at 60 fps without vblank_mode=0.

3. 关于weston运行时的一些环境变量

WAYLAND_SOCKET

WAYLAND_DISPLAY 默认为wayland-0， wayland-1。

XDG_RUNTIME_DIR 默认为/run/user/1000 上述socket文件wayland-0在此目录下。

wayland用egl是为了摆脱x11，glx 建立的context绕不开X。egl创建的context可以使用gbm来创建绘图用的surface，而不需要一个X Window。这样就可以干很多有意思的事情，比如在纯终端下跑opengl，比如kmscon这种。

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