ALSA is used very rarely anymore and the pipewire ALSA emulation isn't as good as using pipewire directly. The Pulseaudio emulation is very good, and Pulseaudio is still commonly available on Linux systems, so we'll default to that first and fall back to pipewire if it's not available. We'll finally try ALSA, to handle very old systems.
Fixes https://github.com/libsdl-org/SDL/issues/7541
These were added a very long time ago and seem to serve no purpose now, as the functionality they provided is now in core Wayland protocols, current information on their usage and status is nonexistent, no modern compositor seems to support them, and the code paths are untested and subject to bit-rot at this point. It also causes duplicate symbol issues when statically linking an application to both Qt and SDL.
Emscripten was using its own, private integer in order to allocate
new SDL_JoystickIDs. SDL keeps a similar integer for allocating
joystick-ids, one which is shared across multiple joystick backends.
SDL 2.0.13 introduces a new joystick-backend, a Virtual joystick
backend, which allows for software-driven joysticks, and which is
designed to sit alongside joystick-backends that provide access to
physical joysticks.
The Emscripten and the Virtual backends were, at times, getting
allocated the same SDL_JoystickIDs, if and when both backends were used
simultaneously. This could happen if, for example, an application
was using a virtual joystick in order to drive a touch-screen
based joystick, while also supporting physical joysticks through the
Emscripten backend.
When two joysticks end up with the same SDL_JoystickID, conflicts
can occur. For example, disconnecting a physical joystick with
the same SDL_JoystickID as a virtual one, can lead to the virtual
joystick being closed, inadvertently.
This fix makes the Emscripten backend use SDL's cross-joystick-backend
integer counter, which is shared among joystick backends, for allocating
new SDL_JoystickIDs, rather than a private, Emscripten-specific
counter.
Fixes https://github.com/libsdl-org/SDL/issues/3647
When converting normalized coordinates to pixel coordinates, the valid range is 0 to (width or height) - 1, and the pixel coordinate of width or height is past the edge of the window.
Fixes https://github.com/libsdl-org/SDL/issues/2913
Pointers to static internal data need to be updated when copying events, or the cleanup code will attempt to free old stack data that went out of scope.
Existing code is erroneous, because it adds or removes dependency's ref count based on number of InitSubSystem/QuitSubSystem calls, while ref count diff should depend on number of inited or quit dependents.
Recursive approach seems to be simplest solution that guarantees proper ref count.
SDL_PollEvent(), SDL_WaitEvent(), and SDL_WaitEventTimeout() all return SDL_bool.
SDL_AddEventWatch() returns an int result code.
Also improved timeout accuracy in SDL_WaitEventTimeout()
