Commit Graph

330 Commits

Author SHA1 Message Date
ameerj
ef8b3623f5 analog_from_button: Fix update_thread.join exception
This commit aims to address an exception that occurs when trying to join the Analog object's update_thread.

By using an atomic bool for the status of the update thread, we ensure its value is consistent across the threads accessing it.
2021-01-29 18:41:22 -05:00
Morph
5942d206c2 sdl_impl: Set the maximum vibration duration to 1 second 2021-01-23 08:06:07 -05:00
german
b483f2d010 Always initialize keyboard input 2021-01-15 09:05:17 -06:00
german
8495e1bd83 Add mutitouch support for touch screens 2021-01-15 09:05:17 -06:00
german
d8df9a16bd Allow to return up to 16 touch inputs per engine 2021-01-15 09:05:17 -06:00
Morph
a745d87971 general: Fix various spelling errors 2021-01-02 10:23:41 -05:00
bunnei
fb41c82aaa
Merge pull request #5265 from german77/port5509
Port citra-emu/citra#5509 "Look at direction of analog axis travel instead of instantaneous sample"
2020-12-30 22:24:30 -08:00
german
aa4c7687ee Port citra-emu/citra#5509 2020-12-30 22:29:20 -06:00
bunnei
22ba437aa4
Merge pull request #5236 from gal20/udp_client_patch
input_common: process udp packets only for the correct pad
2020-12-29 02:51:40 -08:00
gal20
1defd0847a udp client: process packets only for the correct pad 2020-12-27 22:22:48 +02:00
german
80fece4e08 Allow to invert analog axis with right click 2020-12-26 17:46:14 -06:00
Morph
607bb8d14b
Merge pull request #5020 from german77/AnalogfromButtonFix
Disable analog joystick from buttons by default
2020-12-08 10:30:21 +08:00
german
b57ba7bfb6 Disable analog joystick from buttons by default 2020-12-07 19:34:52 -06:00
Lioncash
424bffcd3f mouse_poller: Remove unused includes 2020-12-03 10:41:13 -05:00
Lioncash
16aadcc354 mouse_input: Invert conditional in UpdateYuzuSettings()
Allows the struct to be constructed in place.
2020-12-03 10:41:13 -05:00
Lioncash
395997178b mouse_input: Remove two casts and amend some formatting
Removes the use of two static casts and improves the readability of some
vectors slightly.
2020-12-03 10:41:09 -05:00
Lioncash
5842a767a9 mouse_input: Resolve a -Wdocumentation warning 2020-12-03 10:26:50 -05:00
Lioncash
774d7eab64 mouse_input: Remove unused includes 2020-12-03 10:26:30 -05:00
bunnei
25f650e075
Merge pull request #4937 from german77/multiUDP
InputCommon: Add multiple udp server support
2020-12-01 11:47:37 -08:00
LC
d39dfdf45c
Merge pull request #5047 from german77/MouseInput
InputCommon: Fix implicit conversion in mouse input
2020-12-01 09:40:46 -05:00
german
ece0ae2bfb Fix implicit conversion in mouse input 2020-11-30 21:48:18 -06:00
bunnei
7bc3e80399
Merge pull request #4939 from german77/MouseInput
InputCommon: Implement full mouse support
2020-11-29 22:59:50 -08:00
german
e46f0e084c Implement full mouse support 2020-11-25 23:59:30 -06:00
german
2c2b586d86 Add multiple udp server support 2020-11-25 23:44:41 -06:00
Jan Beich
e48e9a406c input_common: ignore some Clang warnings after 5c4774e8ce
error: unknown warning option '-Werror=unused-but-set-parameter'; did you mean '-Werror=unused-parameter'? [-Werror,-Wunknown-warning-option]
error: unknown warning option '-Werror=unused-but-set-variable'; did you mean '-Werror=unused-const-variable'? [-Werror,-Wunknown-warning-option]
2020-11-25 23:57:11 +00:00
bunnei
d1da7eb119
Merge pull request #4905 from german77/AnalogFromButton
Allow to dial any angle with digital joystick
2020-11-24 16:04:55 -08:00
bunnei
6694e11303
input_common: Fix typo in gc_poller.cpp with [[maybe_unused]]. 2020-11-23 21:42:06 -08:00
bunnei
7fb7540d69 input_common: Add more missing [[maybe_unused]] from #4927. 2020-11-23 20:50:35 -08:00
Lioncash
5c4774e8ce input_common: Treat warnings as errors
Migrates over warnings as errors for input common to match how the
common library treats warnings as errors.
2020-11-22 04:50:03 -05:00
german77
5b6545b141 Modify rumble amplification 2020-11-19 11:30:52 -06:00
bunnei
abda366362
Merge pull request #4866 from Morph1984/mjolnir-p3-prod
Project Mjölnir: Part 3 - Controller Profiles and Vibration Rework
2020-11-17 20:02:27 -08:00
Morph
e7e8a87927 sdl_impl: Pump SDL Events at 1000 Hz 2020-11-15 23:33:21 -05:00
Morph
117bdc71e0 sdl_impl: Revert to the "old" method of mapping sticks
Not all controllers have a SDL_GameController binding. This caused controllers not present in the SDL GameController database to have buttons mapped instead of axes.

Furthermore, it was not possible to invert the axes when it could be useful such as emulating a horizontal single joycon or other potential cases. This allows us to invert the axes by reversing the order of mapping (vertical, then horizontal).
2020-11-15 23:33:21 -05:00
Morph
30e0d1c973 controllers/npad: Remove the old vibration filter
Previously we used a vibration filter that filters out amplitudes close to each other. It turns out there are cases where this results into vibrations that are too inaccurate. Remove this and move the 100Hz vibration filter (Only allowing a maximum of 100 vibrations per second) from sdl_impl to npad when enable_accurate_vibrations is set to false.
2020-11-15 23:33:21 -05:00
Morph
e9e1876e82 input_common: Add VibrationDevice and VibrationDeviceFactory
A vibration device is an input device that returns an unsigned byte as status.
It represents whether the vibration device supports vibration or not.
If the status returns 1, it supports vibration. Otherwise, it does not support vibration.
2020-11-15 23:33:20 -05:00
Morph
38110dd485 configure_input: Add per-player vibration
Allows for enabling and modifying vibration and vibration strength per player.
Also adds a toggle for enabling/disabling accurate vibrations.

Co-authored-by: Its-Rei <kupfel@gmail.com>
2020-11-15 23:33:20 -05:00
Morph
9b501af8e3 controllers/npad: Add heuristics to reduce rumble state changes
Sending too many state changes in a short period of time can cause massive performance issues.
As a result, we have to use several heuristics to reduce the number of state changes to minimize/eliminate this performance impact while maintaining the quality of these vibrations as much as possible.
2020-11-15 23:33:20 -05:00
Morph
ceb7b11f16 configure_input_player: Change "Defaults" button behavior
RestoreDefaults() now restores the selected devices' mappings using UpdateMappingWithDefaults().
This allows us to move the keyboard mapping from RestoreDefaults() to UpdateMappingWithDefaults().
2020-11-15 23:33:20 -05:00
Morph
8ead176639 udp/client: Reduce testing period to 5 seconds 2020-11-15 23:33:19 -05:00
Morph
75eaab2e0f configure_input_player: Implement input exclusivity and persistence
With this, the "Input Devices" combobox should accurately reflect the input device being used and disallows inputs from other input devices unless the input device is set to "Any".
2020-11-15 23:33:19 -05:00
Lioncash
0a50ba3bd1 motion_input: Mark constructor as explicit 2020-11-15 14:20:41 -05:00
Lioncash
cb826bcee7 motion_input: Mark member functions as [[nodiscard]] where applicable 2020-11-15 14:18:09 -05:00
german
f5110340e6 fix minor clang error 2020-11-10 10:38:15 -06:00
german
70df449d0a Allow to dial any angle with digital joystick 2020-11-08 09:15:33 -06:00
german
5333db91c1 Add hotplug, rumble and fix 3rd party adapters for the GC adapter 2020-10-28 21:12:34 -05:00
Morph
2f852f182a sdl_impl: Fix controller reconnection issues
It turns out that after a controller is disconnected, there is a chance that events from the previous controller are sent/processed after it has been disconnected.
This causes the previously disconnected controller to reappear as connected due to GetSDLJoystickBySDLID() emplacing this controller back to the map.

Fix this by only returning an SDLJoystick if and only if it exists in the map.
2020-10-21 09:41:30 -04:00
LC
ea8345cdcd
Merge pull request #4809 from Morph1984/mjolnir-p3
configure_input_player: Fix modifier buttons
2020-10-20 15:00:06 -04:00
bunnei
e03dc4d569
Merge pull request #4627 from Morph1984/fix-dinput-controller-disconnect
sdl_impl: Erase the SDLJoystick entry after removing a controller
2020-10-20 11:40:06 -07:00
Morph
ff82f3894a configure_input_player: Fix modifier buttons
Fix them for real this time, now they finally work.
2020-10-20 14:23:25 -04:00
Lioncash
30b1e71066 udp/client: Make use of designated initializers in TestCommunication()
Same behavior, but makes the callback list nicer to look at.
2020-10-16 06:23:51 -04:00
Lioncash
36cfb234d5 udp/client: Take std::function by const reference with TestCommunication()
Avoids redundant copies.
2020-10-16 06:22:29 -04:00
Morph
7b3f5845d2 sdl_impl: Erase the SDLJoystick entry after removing a controller
Previously, disconnecting a controller still leaves a null SDLJoystick entry within the vector of SDLJoysticks mapped by GUID.
When a DirectInput device of the same GUID is reconnected, it adds that device to a new port causing non-detectable input.
Furthermore, opening the "Configure" menu would cause yuzu to crash since it first tries to resolve the name of a null SDLJoystick entry that was not removed.
Resolve this by properly erasing the SDLJoystick entry from the vector.
2020-10-16 00:04:59 -04:00
Lioncash
046c0c91a3 input_common/CMakeLists: Make some warnings errors
Makes the input_common code warnings consistent with the rest of the
codebase.
2020-10-15 19:37:51 -04:00
bunnei
f250011ba0
Merge pull request #4757 from german77/BetterMotion
InputCommon: Add compatibility with only accelerometer and auto calibrate for drift
2020-10-09 23:37:08 -07:00
bunnei
06e65de93c
Merge pull request #4677 from german77/ShakeFromButton
InputCommon: Add random motion input for buttons
2020-10-08 10:18:39 -07:00
bunnei
e9b81e9f01
Merge pull request #4727 from FrogTheFrog/patch-1
Reduce the "shake" requirements when configuring UDP.
2020-10-06 15:29:28 -07:00
german
a54aee290f Address comments 2020-10-04 18:15:53 -05:00
german
a220d8799e Add compatibility with only accelerometer and auto calibrate for drift 2020-10-03 22:22:01 -05:00
Lukas Senionis
6ee1a784b8 Reduce the "shake" requirements when configuring UDP. 2020-09-30 10:30:33 +03:00
german
ab88c2f611 First implementation of controller rumble 2020-09-29 10:38:25 -04:00
german
2978232390 Add random motion input to keyboard 2020-09-25 17:59:52 -05:00
german
03b574ae22 Add random motion input to SDL 2020-09-25 17:59:52 -05:00
german
c5e257017f Add automap feature for GC adapter 2020-09-18 16:51:16 -05:00
bunnei
3f6d83b27c
Merge pull request #4594 from german77/MotionHID
hid/configuration: Implement motion controls to HID
2020-09-17 12:39:01 -07:00
ReinUsesLisp
bc8ace9917 gc_adapter: Disable MSVC nonstandard extension warning on libusb.h
Pragma disable zero-sized array nonstandard extension warning on MSVC.
2020-09-14 19:38:08 -03:00
Lioncash
c715fc4c5e gc_adapter: Make DeviceConnected() a const member function
This doesn't modify instance state, so it can be made const.
2020-09-07 02:49:13 -04:00
german
797564599f Minor cleanup 2020-09-05 09:42:21 -04:00
german
6ee8eab670 Add cemu hook changes related to PR #4609 2020-09-04 21:48:13 -05:00
german
0774b17846 Remove RealMotionDevice 2020-09-04 21:48:13 -05:00
german
ff679f3d17 Include HID and configuration changes related to motion 2020-09-04 21:48:03 -05:00
bunnei
3b0fe38e86
Merge pull request #4583 from lioncash/trunc
gc_poller: Resolve compilation warnings on MSVC
2020-09-03 20:23:33 -04:00
Morph
45ecd601be input_common/motion_input: Make use of Common::PI constant
Also amend the copyright notice to yuzu's instead of Dolphin's, which was mistakenly copy-pasted from another file.
2020-09-02 11:58:15 -04:00
bunnei
f64917a852
Merge pull request #4570 from german77/motionInput
input_common: Add a basic class for motion devices
2020-09-02 11:09:18 -04:00
bunnei
3dcccabd1d
Merge pull request #4382 from FearlessTobi/port-udp-config
yuzu: Add motion and touch configuration from Citra
2020-09-01 13:56:37 -04:00
Vitor Kiguchi
e6f9fe1f60 sdl_joystick: disable the use of the hidapi drivers due to many problems caused by them.
The main problem is the loss of compatibility with some controllers, but there are also
unwanted changes to the behaviour of PS4 controllers (hardcoded lightbar color).
2020-08-30 05:06:49 +02:00
FearlessTobi
d1e1ea0fef Address second batch of reviews 2020-08-30 00:43:25 +02:00
FearlessTobi
d176feffad Address review comments and fix code compilation 2020-08-29 20:56:51 +02:00
FearlessTobi
e6bd1fd1b8 yuzu: Add motion and touch configuration 2020-08-29 18:56:34 +02:00
Lioncash
69fa6b4906 sdl_impl: Reduce allocations in GetButtonMappingForDevice()
These maps can be constexpr arrays of std::pair.
2020-08-28 21:24:17 -04:00
Lioncash
f2a680ca89 sdl_impl: Make use of std::move on std::string where applicable
Avoids redundant copies.
2020-08-28 21:14:54 -04:00
Lioncash
e92164e6a0 sdl_impl: Make use of insert_or_assign() where applicable
Avoids churning ParamPackage instances.
2020-08-28 21:13:26 -04:00
Lioncash
f3ac088345 sdl_impl: Prevent type truncation in BuildAnalogParamPackageForButton() default arguments
We need to add the 'f' suffix to make the right hand side a float and
not a double.
2020-08-28 21:08:08 -04:00
Lioncash
2e2dde2f95 sdl_impl: Simplify make_tuple call
The purpose of make_tuple is that you don't need to explicitly type out
the types of the things that comprise said tuple.

Given this just returns default values, we can simplify this a bit.
2020-08-28 21:04:18 -04:00
Lioncash
2680526e6b sdl_impl: Mark FromEvent() as a const member function
This doesn't modify internal member state, so it can be marked as const.
2020-08-28 20:58:49 -04:00
Lioncash
98f5d8a713 input_common/main: Remove unnecessary headers 2020-08-28 19:23:19 -04:00
Lioncash
4b9b203c09 input_common/main: Remove unimplemented prototype
I forgot to remove this in the rebase when removing most of the global
variables within the input common codebase.
2020-08-28 19:11:17 -04:00
german
1be18dc110 Fix orientation errors and improve drift correction 2020-08-27 17:19:21 -05:00
german
e6fc3b5662 Address comments 2020-08-27 17:19:21 -05:00
german
2d207ec609 Implement a basic class for motion devices 2020-08-27 17:19:21 -05:00
Lioncash
9e1b0af259 input_common: Eliminate most global state
Abstracts most of the input mechanisms under an InputSubsystem class
that is managed by the frontends, eliminating any static constructors
and destructors. This gets rid of global accessor functions and also
allows the frontends to have a more fine-grained control over the
lifecycle of the input subsystem.

This also makes it explicit which interfaces rely on the input subsystem
instead of making it opaque in the interface functions. All that remains
to migrate over is the factories, which can be done in a separate
change.
2020-08-27 16:11:17 -04:00
Morph
8ffc491546 input_common/main: Add "/Mouse" to the display name 2020-08-26 22:41:51 -04:00
Morph
de79897f04 input_common: Fix directional deadzone values
The hardware tested value is 0.5 which translates to SHRT_MAX / 2
2020-08-26 02:32:32 -04:00
Morph
efa0b7a056 Address feedback 2020-08-26 02:32:32 -04:00
Morph
f0fac0c7fb Project Mjölnir: Part 1
Co-authored-by: James Rowe <jroweboy@gmail.com>
Co-authored-by: Its-Rei <kupfel@gmail.com>
2020-08-26 02:32:32 -04:00
Lioncash
f60d5aac3e gc_poller: Resolve compilation warnings on MSVC
We just need to make our intentional implicit truncations explicit.
2020-08-25 23:03:12 -04:00
Lioncash
b724a4d90c General: Tidy up clang-format warnings part 2 2020-08-13 14:19:08 -04:00
ameerj
d6672501ac Remove UI changes
This PR is now only the Analog devices handling the range value defaulting at 100%
2020-08-10 12:46:14 -04:00
ameerj
9c6ae697f5 Add range slider functionality for gc adapter 2020-08-10 12:46:14 -04:00
Ameer
8928aa3008 undo unnecessary newlines, slider range 50-150 2020-08-10 12:46:14 -04:00
Ameer
ed51c2abda Add range slider for analog sticks 2020-08-10 12:46:14 -04:00
Brian J. Tarricone
d840ed90e1 GCAdapter: only join worker thread if running & joinable 2020-07-26 14:54:02 -07:00
bunnei
4524e1bd54
Merge pull request #4418 from lioncash/udp-warn
udp/client: Remove unused boost include
2020-07-25 21:50:37 -07:00
Lioncash
1a7cf26884 udp/client: Remove unused boost include
Also silences a deprecation warning from boost on Clang/GCC.
2020-07-25 03:42:03 -04:00
Lioncash
ac7e4e2cab gc_adapter: Resolve C++20 deprecation warning 2020-07-25 03:38:22 -04:00
Lioncash
04699c366b gc_poller: Resolve -Wsign-compare warning 2020-07-25 03:37:22 -04:00
Lioncash
e19972dfc4 gc_poller: Resolve -Wredundant-move warning 2020-07-25 03:35:40 -04:00
ameerj
68d6d3e173 Fix axis thresholding while polling
axes were very sensitive when mapping controls.
2020-07-19 11:49:26 -04:00
ameerj
1e7bed0a45 std::size_t where appropriate, make error message more clear if can't read 2020-07-17 12:10:32 -04:00
Ameer
94f5f29573 Refactor adapter code 2020-07-16 13:00:04 -04:00
Ameer
93fe982a0c Rebase to master 2020-07-14 13:04:02 -04:00
Ameer
ab65de2f96 Fix crash if gc configured but adapter not connected 2020-07-14 11:23:10 -04:00
bunnei
393cdb15f5
Merge pull request #4314 from lioncash/input-warn
gcadapter: Tidy up compiler warnings
2020-07-14 10:20:12 -04:00
bunnei
edb291b3be
Merge pull request #4315 from lioncash/udp-warn
udp: Silence a C++20 deprecation warning
2020-07-14 09:33:16 -04:00
Ameer
b284c43385 input_common: drop unused libusb.h include
Remnant of an early implementation.
2020-07-14 01:50:34 +00:00
Jan Beich
883fab2fff input_common: make libusb private to gc_adapter 2020-07-13 18:48:19 +00:00
Lioncash
8df93132cd udp: Silence a C++20 deprecation warning
C++20 deprecates using the = lambda capture to implicitly capture the
this pointer. Instead, we must specify it explicitly.
2020-07-12 15:49:42 -04:00
Lioncash
a1dddca4ab gc_poller: Mark GCButtonFactory::GetNextInput() as const
This doesn't modify class instance state.
2020-07-12 15:43:07 -04:00
Lioncash
839c91cd14 gc_poller: Get rid of undefined behavior in Create()
Ensures that the function always has returns in all control paths.
2020-07-12 15:41:35 -04:00
Lioncash
a8ba6dc3c9 gc_poller: Silence sign conversion warnings 2020-07-12 15:40:22 -04:00
Lioncash
32b6fc4062 gc_adapter: Remove deprecated usage of = in lambda captures
It's deprecated in C++20 to use = to capture the this pointer.

Instead, we can simply pass this as an argument to the thread
constructor.
2020-07-12 15:38:19 -04:00
Lioncash
9ce6ea648f gc_adapter: Silence sign conversion warnings 2020-07-12 15:36:27 -04:00
Ameer
042c6602a0 Break out of scan loop if can't find adapter on first run 2020-07-10 11:07:43 -04:00
Jan Beich
48ff15602e cmake: pass libusb include directory as well
In file included from src/input_common/gcadapter/gc_adapter.cpp:8:
src/./input_common/gcadapter/gc_adapter.h:11:10: fatal error: 'libusb.h' file not found
 #include <libusb.h>
          ^~~~~~~~~~
2020-07-09 15:26:54 +00:00
Ameer
4489ea6f53 Rebase to master, fix merge conflicts 2020-07-08 21:15:49 -04:00
bunnei
5311b562aa
Merge pull request #4266 from jbeich/freebsd
gcadapter: unbreak build on FreeBSD
2020-07-08 16:30:26 -04:00
Ameer
3c7a115afe Address comments for better clarity/signed dev count 2020-07-08 14:18:54 -04:00
Ameer
ec13746e4d Add more libusb error checks 2020-07-08 13:19:33 -04:00
Ameer
b57475887b Address PR feedback, fix axis button thresholding 2020-07-07 12:20:59 -04:00
Jan Beich
1db10b8f4c input_common/gcadapter: add missing C++11 header required by libc++
In file included from src/input_common/gcadapter/gc_adapter.cpp:8:
src/./input_common/gcadapter/gc_adapter.h:77:10: error: no template named 'unordered_map' in namespace 'std'
    std::unordered_map<int, bool> buttons;
    ~~~~~^
src/./input_common/gcadapter/gc_adapter.h:78:10: error: no template named 'unordered_map' in namespace 'std'
    std::unordered_map<int, u16> axes;
    ~~~~~^
2020-07-07 10:02:03 +00:00
Ameer
e3253b5f18 Brace the code! Fix compile error due to class member construction order 2020-07-06 23:01:57 -04:00
Ameer
86abff48e1 Recalibrate reconnected controllers 2020-07-06 22:09:07 -04:00
Ameer
7ad423923d Save origin state of GC controller analog features, compare against origin for input detection 2020-07-06 21:58:31 -04:00
Ameer
d00972fce1 Fix for always firing triggers on some controllers, trigger threshold more universal 2020-07-04 00:40:48 -04:00
Ameer
e69d715e3d Address lioncash feedback: Log formatting, extern const PadButtonArray, little touch ups 2020-07-03 11:52:07 -04:00
Ameer
6e1639c7b0 Fix unnecessary diffs 2020-07-02 16:51:16 -04:00
Ameer
6b7c8e469b Add LR triggers as axes, half press to initiate a press, add GC axis id in config, clarify some code blocks for better readability 2020-07-02 15:54:44 -04:00
Ameer
34a590e509 Reset adapter state on init, fixes errors relating driver hang from unexpected unplug 2020-07-01 12:52:50 -04:00
Ameer
a76e11e7f0 Address feedback regarding increments, const vars, and general cleanup 2020-06-30 17:28:02 -04:00
Ameer
dfdf87d844 fix implicit conversion of size_t type to int 2020-06-30 11:44:55 -04:00
Ameer J
bd697bef03
left const auto&, comment punctuation.
Co-authored-by: Morph <39850852+Morph1984@users.noreply.github.com>
2020-06-26 23:46:49 -04:00
Ameer J
ecbc813711
const& to button in button array
Co-authored-by: VolcaEM <63682805+VolcaEM@users.noreply.github.com>
2020-06-25 19:46:50 -04:00
Ameer
3f739514e3 Stop reading loop if error is encountered 2020-06-25 19:31:51 -04:00
Ameer
c18dc9c707 padbutton enum class and struct initiailization 2020-06-24 11:39:30 -04:00
Ameer
743e1f02a0 cleanup check access, read, and factory GetNextInput funcs. Use size rather than magic number 2020-06-23 17:37:15 -04:00
Ameer
d4e07fd95e Fix deallocation of GC Adapter 2020-06-23 12:47:58 -04:00
Ameer
fcc23139f6 std::array and const reference passing of non-trivial objects 2020-06-22 18:11:59 -04:00
ameerj
f5d2a1e8bd Update src/input_common/main.cpp
Co-authored-by: LC <mathew1800@gmail.com>

update libusb submodule (hopefully windows build error fixed)
2020-06-22 17:05:50 -04:00
Ameer
28046ae3a9 Tidy up the pointers, use pair over tuple where appropriate 2020-06-21 23:56:56 -04:00
Ameer
0f729ef078 fix for sleep using stl 2020-06-21 22:58:53 -04:00
Ameer
46b4461fbb shared_ptr for the GC adapter class, constexpr constants 2020-06-21 21:50:58 -04:00