Add auto controller count detection and make it default

Note: Existing users have to manually adjust this setting

GlosSIConfig/UIModel.cpp

@@ -404,7 +404,7 @@ QVariantMap UIModel::getDefaultConf() const
          QJsonValue::fromVariant(QString::fromStdWString(getSteamUserId(false)))},
         {"globalModeGameId", ""},
         {"globalModeUseGamepadUI", false},
-        {"controller", QJsonObject{{"maxControllers", 1}, {"emulateDS4", false}, {"allowDesktopConfig", false}}},
+        {"controller", QJsonObject{{"maxControllers", -1}, {"emulateDS4", false}, {"allowDesktopConfig", false}}},
         {"devices",
          QJsonObject{
              {"hideDevices", true},

GlosSIConfig/qml/AdvancedTargetSettings.qml

@@ -261,8 +261,14 @@ CollapsiblePane {
                             width: 128
                             editable: true
                             value: shortcutInfo.controller.maxControllers
-                            from: 0
+                            from: -1
                             to: 4
+                            textFromValue: function(value) {
+                                if (value == -1) {
+                                    return qsTr("auto");
+                                }
+                                return Number(value);
+                            }
                             onValueChanged: shortcutInfo.controller.maxControllers = value
                         }
                         RoundButton {
@@ -271,7 +277,12 @@ CollapsiblePane {
                                 helpInfoDialog.text = 
                                     qsTr("GlosSI will only provide [NUMBER] of controllers")
                                     + "\n"
-                                    + qsTr("Required to set to actually connected controller count when using \"real device IDs\" ")
+                                    + qsTr("-1 ^= auto-detect")
+                                    + "\n"
+                                    + qsTr("auto detection only works upon launch")
+                                    + "\n"
+                                    + "\n"
+                                    + qsTr("Required to manuelly set to actually connected controller count when using \"real device IDs\" ")
                                 helpInfoDialog.open()
                             }
                             width: 48

GlosSITarget/InputRedirector.cpp

@@ -49,6 +49,22 @@ InputRedirector::~InputRedirector()
 void InputRedirector::run()
 {
     run_ = vigem_connected_;
+    max_controllers_ = Settings::controller.maxControllers;
+    if (max_controllers_ < 0) {
+        for (int i = 0; i < XUSER_MAX_COUNT; i++) {
+            XINPUT_STATE state{};
+            if (XInputGetState(i, &state) == ERROR_SUCCESS) {
+                max_controllers_ = i + 1;
+            }
+        }
+        if (max_controllers_ < 0) {
+            max_controllers_ = 1;
+            spdlog::error("Failed to auto detect controller count. Defaulting to 1");
+        }
+        else {
+            spdlog::info("Auto detected {} controllers", max_controllers_);
+        }
+    }
     controller_thread_ = std::thread(&InputRedirector::runLoop, this);
 #ifdef _WIN32
     Overlay::AddOverlayElem([this](bool window_has_focus, ImGuiID dockspace_id) {
@@ -58,13 +74,17 @@ void InputRedirector::run()
         ImGui::Text("Max. controller count");
         ImGui::SameLine();
         ImGui::InputInt("##Max. controller count", &countcopy, 1, 1);
+        ImGui::Text("-1 = Auto-detection (auto-detection only works on launch");
         if (countcopy > XUSER_MAX_COUNT) {
             countcopy = XUSER_MAX_COUNT;
         }
-        if (countcopy < 0) {
-            countcopy = 0;
+        if (countcopy < -1) {
+            countcopy = -1;
         }
         Settings::controller.maxControllers = countcopy;
+        if (Settings::controller.maxControllers > -1) {
+            max_controllers_ = countcopy;
+        }
 
         if (ImGui::Checkbox("Emulate DS4 (instead of Xbox360 controller)", &Settings::controller.emulateDS4)) {
             controller_settings_changed_ = true;
@@ -131,12 +151,12 @@ void InputRedirector::runLoop()
                 unplugVigemPad(i);
             }
         }
-        if (Settings::controller.maxControllers < XUSER_MAX_COUNT) {
-            for (int i = Settings::controller.maxControllers; i < XUSER_MAX_COUNT; i++) {
+        if (max_controllers_ < XUSER_MAX_COUNT) {
+            for (int i = max_controllers_; i < XUSER_MAX_COUNT; i++) {
                 unplugVigemPad(i);
             }
         }
-        for (int i = 0; i < XUSER_MAX_COUNT && i < Settings::controller.maxControllers; i++) {
+        for (int i = 0; i < XUSER_MAX_COUNT && i < max_controllers_; i++) {
             XINPUT_STATE state{};
             if (XInputGetState(i, &state) == ERROR_SUCCESS) {
                 if (vt_pad_[i] != nullptr) {

GlosSITarget/InputRedirector.h

@@ -35,6 +35,7 @@ class InputRedirector {
   private:
     void runLoop();
 
+    int max_controllers_ = -1;
     static constexpr int start_delay_ms_ = 2000;
     bool run_ = false;
     int overlay_elem_id_ = -1;

common/Settings.h

@@ -65,7 +65,7 @@ namespace Settings
 
     inline struct Controller
     {
-        int maxControllers = 1;
+        int maxControllers = -1;
         bool allowDesktopConfig = false;
         bool emulateDS4 = false;
     } controller;