linux compile shared lib

[frostworx]

hi,
just stumbled over this upcoming arduino vr project https://www.reddit.com/r/SteamVR/comments/g30lng/arduino_index_controllers_free_head_tracking/
(auther says it will be opensource) and regarding linux compatibility he mentioned your soft_knuckles.
I had to make some minor modifications in order to build your code under linux:

Prop_LegacyInputProfile_String is deprecated so I replaced it with Prop_InputProfilePath_String in soft_knuckles_device.cpp. no idea if this is correct:

--- soft_knuckles_device.cpp	2020-04-18 10:32:44.671686051 +0200
+++ soft_knuckles_device.cpp	2020-04-18 10:18:10.197399235 +0200
@@ -326,7 +326,7 @@
     SetInt32Property(Prop_DeviceClass_Int32, (int32_t)TrackedDeviceClass_Controller);
     SetProperty(Prop_InputProfilePath_String, "{soft_knuckles}/input/soft_knuckles_profile.json");
     SetProperty(Prop_ControllerType_String, "soft_knuckles");
-    SetProperty(Prop_LegacyInputProfile_String, "soft_knuckles");
+    SetProperty(Prop_InputProfilePath_String, "soft_knuckles");
 
     m_component_handles.resize(m_num_component_definitions);
     for (uint32_t i = 0; i < m_num_component_definitions; i++)

WatchdogWakeUp requires an argument now, so this change was required in soft_knuckles_provider.cpp:

--- soft_knuckles_provider.cpp	2020-04-18 10:34:41.931552083 +0200
+++ soft_knuckles_provider.cpp	2020-04-18 10:20:06.928803669 +0200
@@ -181,7 +181,7 @@
 #else
         // for the other platforms, just send one every five seconds
         this_thread::sleep_for(chrono::seconds(5));
-        vr::VRWatchdogHost()->WatchdogWakeUp();
+        vr::VRWatchdogHost()->WatchdogWakeUp(vr::TrackedDeviceClass_HMD);
 #endif
     }
 }

the bundled make_linux.sh just builds the objects but doesn't link a shared lib, so I created a quick&dirty (hardcoded openvr header path) CMakeLists.txt:

cmake_minimum_required(VERSION 2.8)
project(soft_knuckles)
INCLUDE_DIRECTORIES( "/usr/include/openvr" )
SET(SNSRC
	dprintf.cpp
	socket_notifier.cpp 
	soft_knuckles_config.cpp 
	soft_knuckles_debug_handler.cpp 
	soft_knuckles_device.cpp 
	soft_knuckles_provider.cpp 
	)

add_library(
	soft_knuckles
	SHARED
	${SNSRC}
)

builds fine here and creates a libsoft_knuckles.so
haven't tested the result, but maybe it is of some use :)

[spayne]

Thank you for attempting that.
Are you going to test it on Linux? If so, then maybe I can merge this with more confidence that it works on Linux.

I'm also considering adding support for conan as well as cmake - ever use conan?

[frostworx]

hi! yes I'm going to try it on linux. Not sure when exactly but pretty sure soon.
Never used conan, but just checked their project and it looks interesting. For the interested: https://github.com/conan-io/conan
not sure if I have any use of it personally though.

[frostworx]

hi again! gave it a quick try. registering the driver with vrpathreg worked as expected, but I'm stuck at the point where I should connect port 27015. telnet on linux doesn't support udp, so I tried both
netcat localhost 27015 -u
and
socat - UDP:localhost:27015
instead, but nothing happens.

netstat -an | grep 27015
only shows
udp6 0 0 :::27015 :::*
which looks like ipv6, but
netcat -6 localhost 27015 -u
complains with
netcat: getaddrinfo for host "localhost" port 27015: Name or service not known
so looks like it doesn't works as it should ootb.
If I'll find anything useful I'll report back! :)

edit: the udp6 listen didn't come from soft_knuckles but from steamtours. with the correct driver name (see next comment) it looks correctly:
tcp 2 0 127.0.0.1:27015 0.0.0.0:* LISTEN

[frostworx]

me again. the compiled lib is expected to be called "driver_soft_knuckles.so".
now with
netcat localhost 27015
the left controller icon is a green "L" and it looks like it is a configurable virtual controller! :)
haven't found out how I can configure it now, but pretty sure it will work somehow.
the right controller doesn't seem to show up.
directly inside my steamapps/common/SteamVR/
directory a log with hardcoded filename "c:\temp\soft_knuckles_log.txt" was created containing this:

HmdDriverFactory IServerTrackedDeviceProvider_004
SoftKnucklesDevice::SoftKnucklesDevice
SoftKnucklesProvider: constructor called
SoftKnucklesProvider: Init called
SoftKnucklesDevice::Init for role: 1 num_definitions 22
soft_knuckles serial: ksoft1L
soft_knuckles model_number: soft_knuckles
listen thread started
about to listen
SoftKnucklesProvider: Run Frame 1
new connection from port: 27015
SoftKnucklesDevice::Activate.  object ID: 3
SoftKnucklesDevice::CreateScalarComponent for /input/joystick/x on 3
ok
SoftKnucklesDevice::CreateScalarComponent for /input/joystick/y on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/joystick/click on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/joystick/touch on 3
ok
SoftKnucklesDevice::CreateScalarComponent for /input/trackpad/x on 3
ok
SoftKnucklesDevice::CreateScalarComponent for /input/trackpad/y on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/trackpad/click on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/trackpad/touch on 3
ok
SoftKnucklesDevice::CreateScalarComponent for /input/trigger/value on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/trigger/click on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/trigger/touch on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/grip/click on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/system/click on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/system/touch on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/a/click on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/a/touch on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/b/click on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/b/touch on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/application_menu/click on 3
ok
SoftKnucklesDevice::CreateBooleanComponent for /input/application_menu/touch on 3
ok
SoftKnucklesDevice::CreateSkeletonComponent for /input/skeleton/left
ok
SoftKnucklesDevice::CreateHapticComponent for /output/haptic
ok
SoftKnucklesDevice::GetComponent: IVRDisplayComponent_002
SoftKnucklesDevice::GetComponent: IVRDriverDirectModeComponent_005
SoftKnucklesDevice::GetComponent: IVRCameraComponent_003
SoftKnucklesDevice::GetComponent: IVRVirtualDisplay_002
SoftKnucklesDevice::GetComponent: IVRControllerComponent_001
SoftKnucklesProvider: LeaveStandby
SoftKnucklesProvider: Run Frame 10001
SoftKnucklesProvider: Run Frame 20001

doesn't look to bad for the beginning, eh? :)

[frostworx]

last try today:
in soft_knuckles_provider.cpp
NUM_DEVICES is set to 1
but right hand only is activated
if (NUM_DEVICES > 1)
is this intended?

[spayne]

if (NUM_DEVICES > 1)
is this intended?

Yes it's intended, but it's just a starting point. If you want both devices set NUM_DEVICES to 2. The rationale for this as a starting point is is easier to work with a finished controller one hand and bring up a new device on your other hand. Specifically you might want to use an index controller to navigate menus on you left hand, while testing your new controller on your right hand.

[frostworx]

I see, makes sense. might be a good idea to update the documentation starting from 9 then.

[spayne]

you are right. The documentation is out of whack, since after step 9 it's showing multiple devices.