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wayland: don't hang in SDL_GL_SwapBuffers if the compositor is ghosting us.

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If you hide a window on Mutter, for example, the compositor never requests
new frames, which will cause Mesa to block forever in eglSwapBuffers to
satisfy the swap interval.

We now always set the swap interval to 0 and manage this ourselves, handing
the frame to Wayland when it requests a new one, and timing out at 10fps just
to keep apps moving if the compositor wants no frames at all.

My understanding is that other protocols are coming that might improve upon
this solution, but for now it solves the total hang.

Fixes #4335.
This commit is contained in:
Ryan C. Gordon
2021-04-30 13:19:36 -04:00
parent 227021b647
commit c54c16d353
5 changed files with 97 additions and 7 deletions
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include/SDL_video.h
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@@ -1795,7 +1795,7 @@ extern DECLSPEC void SDLCALL SDL_GL_GetDrawableSize(SDL_Window * window, int *w,
* vsync. Adaptive vsync works the same as vsync, but if you've already missed
* the vertical retrace for a given frame, it swaps buffers immediately, which
* might be less jarring for the user during occasional framerate drops. If
* application requests adaptive vsync and the system does not support it,
* an application requests adaptive vsync and the system does not support it,
* this function will fail and return -1. In such a case, you should probably
* retry the call with 1 for the interval.
*