feat: feature flag to use libmonado or not

Cargo.lock

@@ -289,6 +289,7 @@ dependencies = [
  "gettext-rs",
  "git2",
  "gtk4",
+ "lazy_static",
  "libadwaita",
  "libmonado-rs",
  "libusb",

Cargo.toml

@@ -14,6 +14,7 @@ git2 = "0.17.2"
 gtk4 = { version = "0.7.2", features = [
     "v4_10",
 ] }
+lazy_static = "1.4.0"
 libadwaita = { version = "0.5.2", features = [
     "v1_3"
 ] }

README.md

@@ -33,6 +33,12 @@ cd envision
 ./dist/appimage/build_appimage.sh
 ```
 
+# Feature flags
+
+|Env var|Values|Default|
+|---|---|---|
+|`ENVISION_FF_USE_LIBMONADO`|`1`: enabled; `0`: disabled|`0`|
+
 # Common issues
 
 ## NOSUID with systemd-homed

src/ui/app.rs

@@ -3,6 +3,7 @@ use super::alert::alert;
 use super::build_window::{BuildStatus, BuildWindow};
 use super::debug_view::{DebugView, DebugViewMsg};
 use super::fbt_config_editor::{FbtConfigEditor, FbtConfigEditorInit, FbtConfigEditorMsg};
+use super::feature_flags::FF_LIBMONADO_DEVICE_ENUMERATION_ENABLED;
 use super::job_worker::internal_worker::JobWorkerOut;
 use super::job_worker::job::WorkerJob;
 use super::job_worker::JobWorker;
@@ -312,6 +313,7 @@ impl SimpleComponent for App {
             }
             Msg::ClockTicking => {
                 self.main_view.sender().emit(MainViewMsg::ClockTicking);
+                if *FF_LIBMONADO_DEVICE_ENUMERATION_ENABLED {
                     if let Some(w) = self.xrservice_worker.as_ref() {
                         if {
                             let state = w.state.lock().unwrap();
@@ -336,12 +338,23 @@ impl SimpleComponent for App {
                         }
                     }
                 }
+            }
             Msg::ParseLog(rows) => {
                 for row in rows {
                     match MonadoLog::new_from_str(row.as_str()) {
                         None => {}
                         Some(parsed) => {
-                            if let Some(tracker) =
+                            if !*FF_LIBMONADO_DEVICE_ENUMERATION_ENABLED
+                                && parsed.func == "p_create_system"
+                            {
+                                let n_devs = XRDevice::from_log_message(parsed.message.as_str());
+                                self.xr_devices = XRDevice::merge(&self.xr_devices, &n_devs);
+                                self.main_view
+                                    .sender()
+                                    .emit(MainViewMsg::UpdateDevices(
+                                        self.xr_devices.clone(),
+                                    ));
+                            } else if let Some(tracker) =
                                 XRDevice::generic_tracker_from_log_row(parsed.message.as_str())
                             {
                                 self.xr_devices.push(tracker);

src/ui/feature_flags.rs

@@ -0,0 +1,10 @@
+use std::env;
+use lazy_static::lazy_static;
+
+fn get_ff_libmonado_device_enumeration_enabled() -> bool {
+    env::var("ENVISION_FF_USE_LIBMONADO").unwrap_or_default() == "1"
+}
+
+lazy_static! {
+    pub static ref FF_LIBMONADO_DEVICE_ENUMERATION_ENABLED: bool = get_ff_libmonado_device_enumeration_enabled();
+}

src/ui/mod.rs

@@ -16,3 +16,4 @@ pub mod profile_editor;
 pub mod steam_launch_options_box;
 pub mod util;
 pub mod wivrn_conf_editor;
+pub mod feature_flags;