It seems clang defaults to unsigned for enums. Interestingly, gcc was ok
with the checks being either way. I guess gcc treats enums that *can* be
unsigned as DWIM.
While using barriers is a zillion times better than actually grabbing
the mouse and keyboard, they're still a pain when debugging as qf is not
able to respond to the barrier-hit events. All the other logic is still
there so even when "grabbing", the mouse will not be blocked if the
window doesn't have focus.
It seems X11 does not like creating barriers entirely off the screen,
though the error seems to be a little unreliable (however, off the left
edge was definitely bad).
For now, only the first two axis (mouse X and Y) are supported (XInput
treats the scroll wheel events as axes too, so mice have up to 4!), but
most importantly, this prevents the scroll wheel from being seen as the
X axis. Oops.
UI key presses are still handled by regular X events, but in-game
"button" presses arrive via raw keyboard events. This gives transparent
handling of keyboard repeat (UI keys see repeat, game keys do not),
without messing with the server's settings (yay, that was most annoying
when it came to debugging), and the keyboard is never grabbed, so this
is a fairly user-friendly setup.
At first, I wasn't too keen on capturing them from the root window
(thinking about the user's security), but after a lot of investigation,
I found a post by Peter Hutterer
(http://who-t.blogspot.com/2011/09/whats-new-in-xi-21-raw-events.html)
commenting that root window events were added to XInput2 specifically
for games. Since application focus is tracked and unfocused key events
are dropped very early on, there's no way for code further down the
food-chain to know there even was an event, abusing the access would
require modifying the x11 input code, in which case all bets are off
anyway and any attempt at security anywhere in the code will fail,
meaning that nefarious progs code and the like shouldn't be a problem.
After a lot of thought, it really doesn't make sense to have an option
to block mouse input in x11 (not grabbing or similar does make sense, of
course). Not initializing mouse input made perfect sense in DOS and even
console Linux (SVGA) what with the low level access.
It turns out that if the barriers are set on the app window, and the app
grabs the pointer (even passively), barrier events will no longer be
sent to the app. However, creating the barriers on the root window and
the events are selected on the root window, the barrier events are sent
regardless of the grab state.
Other subsystems, especially low-level input drivers, need to know when
the app has input focus. eg, as the evdev driver uses the raw stream
from the kernel, which has no idea about X application focus (in fact,
it seems the events are shared across multiple apps without any issue),
the evdev driver sees all the events thus needs to know when to drop
them.
It turns out to be possible to get a barrier event at the same time as a
configure notify event (which rebuilds the barriers), and trying to
release the pointer at such a time results in a bad barrier error and
program crash. Thus check the event barrier against the currently
existing barriers before attempting to release the pointer.
This does mean that a better mechanism for sequencing window
repositioning and barrier creation may be required.
This should be a much friendlier way of "grabbing" input, though I
suspect that using raw keyboard events will result in a keyboard grab,
which is part of the reason for wanting a friendly grab.
There does seem to be a problem with the mouse sneaking out of the
top-right and bottom-left corners. I currently suspect a bug in the X
server, but further investigation is needed.
This is necessary in focus-follows-mouse environments (at least for
openbox, but it wouldn't surprise me if most other WMs behave the same
way) because the WMs don't set focus when the pointer is grabbed (which
XInput does before the WM sees the enter event). This is especially
important when the window is fullscreen on a multi-monitor setup as
there is no border to *maybe* catch the mouse before it enters the
window.
Right now, only raw pointer motion and button events are handled, and
the mouse escapes the window, and there are some issues with focus in
focus-follows-mouse environments. However, this should be a much nicer
setup than DGA.
The current limit is still 32. Dealing with it properly will take some
rather advanced messing with XInput, and will be necessary assuming
non-XInput support is continued.
There's now IN_X11_Preinit, IN_X11_Postinit (both for want of better
names), and in_x11_init. The first two are for taking care of
initialization that needs to be done before window creation and between
window creation and mapping (ie, are very specific to X11 stuff) while
in_x11_init takes care of the setup for the input system. This proved
necessary in my XInput experimentation: a passive enter grab takes
effect only when the pointer enters the window, thus setting up the grab
with the pointer already in the window has no effect until the pointer
leaves the window and returns.
Input driver can now have an optional init_cvars function. This allows
them to create all their cvars before the actual init pass thus avoiding
some initialization order interdependency issues (in this case, fixing a
segfault when starting x11 clients fullscreen due to the in_dga cvar not
existing yet).
Mouse axis and button names are handled internally (and thus
case-insensitive).
Key names are handled by X11. Case-sensitivity is currently determined
by Xlib.
The cooked inputs (ie_key, ie_mouse) are intended for UI interaction, so
generally should have priority over the raw events, which are intended
for game interaction.
This has smashed the keydest handling for many things, and bindings, but
seems to be a good start with the new input system: the console in
qw-client-x11 is usable (keyboard-only).
The button and axis values have been removed from the knum_t enum as
mouse events are separate from key events, and other button and axis
inputs will be handled separately.
keys.c has been disabled in the build as it is obsolute (thus much of
the breakage).
I'm undecided on how to handle application focus (probably gain/lose
events), and the destination handler has been a stub for a while. One less
dependency on the "old" key handling code.
I'm undecided if the pasted text should be sent as a string rather than
individual key events, but this will do the job for now as it gets me
closer to being able to test everything.
It seems that under certain circumstances (window managers?), select is not
reliable for getting key events, so use of select has been disabled until I
figure out what's going on and how to fix it.
For the mouse in x11, I'm not sure which is more cooked: deltas or
window-relative coordinates, but I don't imagine that really matters too
much. However, keyboard and mouse events suitable for 2D user interfaces
are sent at the same time as the more game oriented button and axis events.
The x11 keyboard and mouse devices are really core input devices rather
than x11 input devices in that keyboard and mouse will be present on most
systems and thus not specific to the main user interface (x11, windows,
etc).
Now nothing works at all ;) However, that's only because the binding
system is incomplete: the X11 input events are getting through to the
binding system, so now it's just a matter of getting that to work.
The common input code (input outer loop and event handling) has been
moved into libQFinput, and modified to have the concept of input drivers
that are registered by the appropriate system-level code (x11, win,
etc).
As well, my evdev input library code (with hotplug support) has been
added, but is not yet fully functional. However, the idea is that it
will be available on all systems that support evdev (Linux, and from
what I've read, FreeBSD).
The recent changes to key handling broke using escape to get out of the
console (escape would toggle between console and menu). Thus take care
of the menu (escape) part of the coupling FIXME by implementing a
callback for the escape key (and removing key_togglemenu) and sorting
out the escape key handling in console. Seems to work nicely
The attached patch (against quakeforge git) changes the [con]width,
[con]height, and most importantly the rowbytes members of viddef_t
from unsigned to signed int, like in q2. This allows for a properly
negative vid.rowbytes which may be needed in, e.g. a DIB sections
windows driver if needed. Along with it, I changed a few places
where unsigned int is used along with comparisons against the relevant
vid.* members.
One thing I am not 100% sure is the signedness requirements of
d_zrowbytes and d_zwidth: q2 has them as unsigned but I am not sure
whether that is because they are needed as unsigned or it was just an
oversight of the id developers. They do look like they should be OK
as signed int to me, though: comments?
==
Note from Bill Currie: I had to do some extra changes as many
signed/unsigned comparisons were somehow missed.
