[PATCH] wined3d: Avoid crash in swapchain_gl_present() if context could not be acquired.

[Henri Verbeet]

On Wed, 13 Nov 2019 at 19:16, Paul Gofman <gofmanp at gmail.com> wrote:
> That what happens with AION game, upon transition from login screen to
> 3D scene display. I did not unwind the sequence which leads to that,
> there is quite the time to pass loading to that point, and then it uses
> some mixture of d3d9 and d3d11 elements rendered to the same main
> window. Adding this check fixes the crash and it renders everything
> flawlessly after that. Somehow I though a lot of things can go wrong
> during acquiring or creating a new context for the thread, especially
> when the app is recreating Windows and devices. If nothing of that is
> supposed, I can try to detect what exactly is going on there, but that's
> going to take some time.
>
There are certainly cases where creating a valid OpenGL context could
legitimately fail, but for those cases I'd either expect it to fail
earlier during swapchain creation, or to fallback to creating a
"backup window" context.