Will manually controlling both an accelerometer and a gyroscope at the
same time be reasonable to do? No idea. Was this easy to implement
thanks to the input override system? Yes.
Fixes https://bugs.dolphin-emu.org/issues/12443.
Up until now, there have been two settings on Android that stored the
selected Wii Remote extension: the normal one that's also used on PC,
and a SharedPreferences one that's used by the overlay controls to
determine what controls to show. It is possible for these two to end up
out of sync, and my input changes have made that more likely to happen.
To fix this, let's rework how the overlay controller setting works.
We don't want it to encode the currently selected Wii Remote extension.
However, we can't simply get rid of the setting, because for some Wii
games we need the ability to switch between a GameCube controller and a
Wii Remote. What this commit does is give the user the option to select
any of the 4 GameCube controllers and any of the 4 Wii Remotes. (Before,
controllers 2-4 weren't available in the overlay.) Could be useful for
things like the Psycho Mantis fight in Metal Gear Solid. I'm also
switching from SharedPreferences to Dolphin.ini while I'm at it.
This is a small regression from KillRenderer, which caused duplicated
frames to be counted on the FPS counter when the "Skip Presenting
Duplicated Frames" option was disabled.
This way, Android (which will show groups in the order they're defined)
will show groups in a more logical order similar to DolphinQt.
The main thing that was annoying me was how early Rumble was for
Wii Remotes. Some of the other changes I'm making in this commit,
like the order of Shake/Tilt/Swing, are more arbitrary and were
made for consistency with DolphinQt. But there are also places
where I didn't go all the way with matching DolphinQt. Most notably,
DolphinQt puts sticks before buttons, but I don't see any reason
to do that for Android.
Unlike PCs, Android doesn't really have any input method (not counting
touch) that can reasonably be expected to exist on most devices.
Because of this, I don't think shipping with a default mapping for the
buttons and sticks of GameCube controllers and Wii Remotes makes sense.
I would however like to ship default mappings for a few things:
1. Mapping the Wii Remote's accelerometer and gyroscope to the device's
accelerometer and gyroscope. This functionality is useful mainly
for people who use the touchscreen, but can also be useful when
using a clip-on controller. The disadvantage of having this mapped
by default is that games disable pointer input if the accelerometer
reports that the Wii Remote is pointed at the ceiling.
2. Mapping GC keyboards for use with a physical keyboard, like on PC.
After all, there's no other way of mapping them that makes sense.
3. Mapping rumble to the device's vibrator.
Aside from the GC keyboards, this approach is effectively the same as
what we were doing before the input overhaul.
This second stack leads to JNI problems on Android, because ART fetches
the address and size of the original stack using pthread functions
(see GetThreadStack in art/runtime/thread.cc), and (presumably) treats
stack addresses outside of the original stack as invalid. (What I don't
understand is why some JNI operations on the CPU thread work fine
despite this but others don't.)
Instead of creating a second stack, let's borrow the approach ART uses:
Use pthread functions to find out the stack's address and size, then
install guard pages at an appropriate location. This lets us get rid
of a workaround we had in the MsgAlert function.
Because we're no longer choosing the stack size ourselves, I've made some
tweaks to where the put the guard pages. Previously we had a stack of
2 MiB and a safe zone of 512 KiB. We now accept stacks as small as 512 KiB
(used on macOS) and use a safe zone of 256 KiB. I feel like this should
be fine, but haven't done much testing beyond "it seems to work".
By the way, on Windows it was already the case that we didn't create
a second stack... But there was a bug in the implementation!
The code for protecting the stack has to run on the CPU thread, since
it's the CPU thread's stack we want to protect, but it was actually
running on EmuThread. This commit fixes that, since now this bug
matters on other operating systems too.
Mai