Add experimental support for using ADL MIDI instead of SDL for music
playback. Support for ADL MIDI contributed by Github user jpcima. This
feature is minimally supported by the core Rebirth team, but is included
as a courtesy so that users need not patch in support separately.
Suggested-by: jpcima <https://github.com/dxx-rebirth/dxx-rebirth/pull/408>
Add configuration file entries for number of chips, bank index, and
whether to use ADL MIDI. Currently, there is no GUI for this.
Interested users must enable it via direct configuration file editing.
A menu interface will come later.
- Use the Windows type `HMODULE` on Windows, and define a local alias to
it on non-Windows. This makes the code slightly clearer about the
nature of the value `handle`.
- Move the `dlopen` emulation into the anonymous namespace to encourage
inlining, since the wrappers are trivial name/signature compatibility
functions.
- Move the error reporting out of the template function, so that it is
not redundantly instantiated for each type used with the template.
Global data will default to nullptr, so the initialization is
unnecessary. Some compilers may store the pointer in `.data` when it is
initialized to any value.
For each link given as http://, verify that the site is accessible over
https:// and, if so, switch to it. These domains were converted:
* llvm.org
* clang.llvm.org
* en.cppreference.com
* www.dxx-rebirth.com
* www.libsdl.org
* www.scons.org
Add macro cf_assert ("control flow" assert) to hint to gcc that certain
conditions are impossible. Use it to avoid generating range checks for
situations that never happen. If the event did happen, the only
consequence would be truncated UI text, rather than a correctness
problem.
Move it to a structure. Make all the modifiers methods. Change all
callers of those methods to pass the structure. This makes the stuck
object handling free of direct access to global game data.
gcc-7 allows `constexpr auto X = std::initializer_list<unsigned>{A1, A2,
...};`. gcc-8 rejects it:
```
common/arch/sdl/key.cpp:583:105: error: 'const std::initializer_list<const SDL_Scancode>{((const SDL_Scancode*)(&<anonymous>)), 3}' is not a constant expression
constexpr auto sticky_keys = {SDL_SCANCODE_CAPSLOCK, SDL_SCANCODE_SCROLLLOCK, SDL_SCANCODE_NUMLOCKCLEAR};
```
Switch to a macro and a fully anonymous list, which is accepted by both
versions.
Fixes: f491059ed7 ("Enable building with SDL2")
This commit enables Rebirth to build with SDL2, but the result is not
perfect.
- SDL2 removed some sticky key support. Rebirth may behave differently
now in this area.
- SDL2 removed some key-repeat related support. Rebirth may behave
differently now in this area.
- SDL2 gained the ability to make a window fullscreen by sizing it to
the desktop instead of by changing the desktop resolution. Rebirth
uses this, and it mostly works.
- Resizing while in the automap does not notify the automap code, so
the view is wrong until the player switches out of automap mode and
back in.
- SDL2 changed how to enumerate available resolutions. Since
fitting the window to the desktop is generally more useful than
fitting the desktop to the window, I chose to drop support for
enumerating resolutions instead of porting to the new API. Users can
now enter an arbitrary window dimension and Rebirth will make an
attempt to use it.
- It might be useful to cap the window dimension at the desktop
dimension, but that is not done yet.
- Entering fullscreen mode through the Controls->Graphics submenu
failed to notify the relevant subsystems, causing the rendered
content not to rescale. For now, compile out the option to toggle
full screen through that menu. Toggling through Alt+Enter works
properly.
Despite these quirks, this is a substantial improvement over the prior
commit, where SDL2 cannot be used at all. The remaining issues can be
resolved in future work.
References: <https://github.com/dxx-rebirth/dxx-rebirth/issues/82>
gcc-8 adds a new warning controlled by -Wcast-function-type, which is
implied on by Rebirth's default options. This new warning rejects
attempts to reinterpret_cast between function pointer types. While this
might provide some value when the function pointer was derived by taking
the address of a properly declared function provided elsewhere in the
same program, it is wrong when the function pointer is returned by an
external library call, such as GetProcAddress, which always returns a
placeholder type instead of the actual type of the target function.
Switch to using a union with type-punning, which achieves the same
effect as the cast, but does not count as a cast, and therefore does not
provoke the warning.
References: <https://github.com/dxx-rebirth/dxx-rebirth/issues/388>
