Only enable the gamescope config button if it's actually enabled

src/launchercore.cpp

@@ -266,6 +266,9 @@ QString LauncherCore::readVersion(QString path) {
 void LauncherCore::readInitialInformation() {
     defaultProfileIndex = settings.value("defaultProfile", 0).toInt();
 
+    gamescopeAvailable = checkIfInPath("gamescope");
+    gamemodeAvailable = checkIfInPath("gamemoderun");
+
     auto profiles = settings.childGroups();
 
     // create the Default profile if it doesnt exist
@@ -348,8 +351,13 @@ void LauncherCore::readInitialInformation() {
 
         profile.useDX9 = settings.value("useDX9", false).toBool();
         profile.useEsync = settings.value("useEsync", false).toBool();
-        profile.useGamemode = settings.value("useGamemode", false).toBool();
+
+        if(gamescopeAvailable)
             profile.useGamescope = settings.value("useGamescope", false).toBool();
+
+        if(gamemodeAvailable)
+            profile.useGamemode = settings.value("useGamemode", false).toBool();
+
         profile.enableDXVKhud = settings.value("enableDXVKhud", false).toBool();
         profile.enableWatchdog = settings.value("enableWatchdog", false).toBool();
 
@@ -560,3 +568,12 @@ void LauncherCore::readExpansionVersions(ProfileSettings& info, int max) {
     for(int i = 0; i < max; i++)
         info.expansionVersions.push_back(readVersion(QString("%1/game/sqpack/ex%2/ex%2.ver").arg(info.gamePath, QString::number(i + 1))));
 }
+
+bool LauncherCore::checkIfInPath(const QString program) {
+    // TODO: also check /usr/local/bin, /bin32 etc (basically read $PATH)
+    const QString directory = "/usr/bin";
+
+    QFileInfo fileInfo(directory + "/" + program);
+
+    return fileInfo.exists() && fileInfo.isFile();
+}

src/launchercore.h

@@ -88,7 +88,7 @@ public:
     int addProfile();
     int deleteProfile(QString name);
 
-    void launchGame(const ProfileSettings& settings, const LoginAuth auth);
+    void launchGame(const ProfileSettings& settings, LoginAuth auth);
     void launchExecutable(const ProfileSettings& settings, QStringList args);
     void launchExecutable(const ProfileSettings& settings, QProcess* process, QStringList args);
     void buildRequest(QNetworkRequest& request);
@@ -109,12 +109,16 @@ public:
     AssetUpdater* assetUpdater;
     Watchdog* watchdog;
 
+    bool gamescopeAvailable = false;
+    bool gamemodeAvailable = false;
+
     int defaultProfileIndex = 0;
 signals:
     void settingsChanged();
 
 private:
     void readExpansionVersions(ProfileSettings& info, int max);
+    bool checkIfInPath(QString program);
 
     QVector<ProfileSettings> profileSettings;
 };

src/settingswindow.cpp

@@ -273,17 +273,18 @@ SettingsWindow::SettingsWindow(LauncherWindow& window, LauncherCore& core, QWidg
     });
     gamescopeButtonLayout->addWidget(gamescopeLabel);
 
-    auto gamescopeCfg = new QPushButton("Configure...");
+    configureGamescopeButton = new QPushButton("Configure...");
-    connect(gamescopeCfg, &QPushButton::pressed, [&] {
+    connect(configureGamescopeButton, &QPushButton::pressed, [&] {
         auto gamescopeSettingsWindow = new GamescopeSettingsWindow(getCurrentProfile(), this->core, this);
         gamescopeSettingsWindow->show();
     });
-    gamescopeButtonLayout->addWidget(gamescopeCfg);
+    gamescopeButtonLayout->addWidget(configureGamescopeButton);
 
     connect(useGamescope, &QCheckBox::stateChanged, [this](int state) {
         getCurrentProfile().useGamescope = state;
 
         this->core.saveSettings();
+        this->reloadControls();
     });
 
     useGamemode = new QCheckBox("Use Gamemode");
@@ -393,6 +394,11 @@ void SettingsWindow::reloadControls() {
     useEsync->setChecked(profile.useEsync);
     useGamescope->setChecked(profile.useGamescope);
     useGamemode->setChecked(profile.useGamemode);
+
+    useGamemode->setEnabled(core.gamemodeAvailable);
+    useGamescope->setEnabled(core.gamescopeAvailable);
+
+    configureGamescopeButton->setEnabled(profile.useGamescope);
 #endif
 
 #ifdef ENABLE_WATCHDOG

src/settingswindow.h

@@ -37,6 +37,7 @@ private:
     QPushButton* selectWineButton;
     QLineEdit* winePathLabel;
     QLineEdit* winePrefixDirectory;
+    QPushButton* configureGamescopeButton;
 
     QCheckBox* useGamescope, *useEsync, *useGamemode;
     QCheckBox* enableWatchdog;