__sync_lock_test_and_set() is designed for creating locks, not as
a general atomic exchange function. As a result, it only provides
an acquire memory barrier and isn't guaranteed to actually store
the provided value (though it does on architectures we care about).
__atomic_exchange_n() is supported on GCC/Clang for the last ~10
years, so let's use that instead if available. We will keep the
__sync_lock_test_and_set() fallback around for ancient platforms,
but add a full memory barrier to match the documented behavior.
This hint is documented to not just turn off fullscreen windows going into a
new Fullscreen Space, but also to make the green button on a resizeable
window's title bar do a maximize/zoom instead of make the window fullscreen.
Previously, this only did the former and not the latter (or perhaps it worked
and the defaults changed in a newer macOS, we aren't sure).
Fixes#7470.
(cherry picked from commit 50f3adec77)
When there is already a BApplication, SDL cannot start its own. In a
previous version, it instead started a separate looper. This results in
some extra complexity as there is now yet another thread to manage (in
addition to the main thread, the application thread, and the window
threads).
Instead, create a BHandler and attach it to the existing BApplication,
which allows it to receive messages in the already existing application
thread.
At best, this is a no-op.
At worst, it might:
- Clobber a signal handler someone registered after us
- Overwrite the signal mask or flags
- Cause unregistration to fail (sigaction() isn't guaranteed to return the exact pointer passed to signal())
If this application is being run under Wine but Steam doesn't know that, Steam won't set STEAM_COMPAT_PROTON. So we'll use wine_get_version() to detect that we're running under Wine instead.
(cherry picked from commit e2e8f86076)
This makes sure that anything that hooks window creation to set up window proc hooks will call DefWindowProc instead of infinitely recursing when we set up our window proc afterwards.
Fixes https://github.com/libsdl-org/SDL/issues/10529
(cherry picked from commit 6c4f2bd83d)
Implements extraction and launching of a 'launchOnExit' URI parameter from protocol activation in SDL_WinRTApp. The URI is stored and launched on app exit, suspension, or window close, enabling return-to-caller scenarios for protocol-activated apps.
The Wayland backend lacks pointer warp functionality, so special-case the relative warp mode hint to deliver accelerated relative motion deltas, which is ultimately what the client wants by enabling this hint.
