backend/wayland: spurious eglSwapBuffers failures

[emersion]

Sometimes eglSwapBuffers fails on the Wayland backend. Maybe we're running out of buffers.

2019-07-23 19:12:39 - [EGL] eglSwapInterval: eglSwapInterval
2019-07-23 19:12:39 - [EGL] eglSwapBuffers: eglSwapBuffers
2019-07-23 19:12:39 - [render/egl.c:400] eglSwapBuffers failed

[RedSoxFan]

It looks like this effects the DRM backend as well: swaywm/sway#4419 and #1780

[Emantor]

Probably "fixed" by #1781

[emersion]

Can still reproduce.

[aemino]

I also encounter this with my toy compositor using the Wayland backend. It tends to happen occasionally when I move my mouse in and out of the compositor window.

[ascent12]

I recently updated the EGL log message to give the error code, now making it:

2019-09-20 15:30:31 - [EGL] command: eglSwapInterval, error: 0x300d, message: "eglSwapInterval"
2019-09-20 15:30:31 - [EGL] command: eglSwapBuffers, error: 0x300d, message: "eglSwapBuffers"
2019-09-20 15:30:31 - [render/egl.c:402] eglSwapBuffers failed

The reliable way to trigger it on sway is to simply have a client open, unfocus then focus the window (happens on both), which I assume is triggering an xdg_surface.configure and wl_surface.frame. The X11 backend is not affected.

0x300d is EGL_BAD_SURFACE.

[emersion]

Seems like the error code for eglSwapInterval has changed. It's now:

00:01:01.199 [EGL] command: eglSwapInterval, error: 0x3006, message: "eglSwapInterval"
00:01:01.199 [EGL] command: eglSwapBuffers, error: 0x300d, message: "eglSwapBuffers"
00:01:01.199 [render/egl.c:449] eglSwapBuffers failed