launcher: configure and preview DualSense lightbar color (#912)

launcher: configure and preview controller lightbar color

Add an optional lightbar color to launcher settings and pass it to the emulator with --controller-color. Preview changes on RGB gamepads, handle controller hotplug events, and restore the saved color when settings dialogs close. Release launcher preview handles when starting a game.

Co-authored-by: m66401970-eng <m66401970@gmail.com>

src/launcher/include/configuration.h

@@ -5,6 +5,7 @@
 
 #include <QByteArray>
 #include <QChar>
+#include <QColor>
 #include <QMetaEnum>
 #include <QMetaType>
 #include <QObject>
@@ -88,6 +89,7 @@ public:
 	QString                user_name                   = "Kyty";
 	int                    user_id                     = Config::DEFAULT_USER_ID;
 	QString                audio_input_device;
+	QString                controller_color;
 	PresentMode            present_mode                = PresentMode::Mailbox;
 	int                    gpu_index                   = -1;
 	bool                   fullscreen_enabled          = false;
@@ -119,6 +121,7 @@ public:
 		user_name                   = other.user_name;
 		user_id                     = other.user_id;
 		audio_input_device          = other.audio_input_device;
+		controller_color            = other.controller_color;
 		present_mode                = other.present_mode;
 		gpu_index                   = other.gpu_index;
 		fullscreen_enabled          = other.fullscreen_enabled;
@@ -165,6 +168,7 @@ public:
 		KYTY_CFG_SET(user_name);
 		KYTY_CFG_SET(user_id);
 		KYTY_CFG_SET(audio_input_device);
+		KYTY_CFG_SET(controller_color);
 		KYTY_CFG_SET(present_mode);
 		KYTY_CFG_SET(gpu_index);
 		KYTY_CFG_SET(fullscreen_enabled);
@@ -204,6 +208,8 @@ public:
 		                         ? saved_user_id
 		                         : Config::DEFAULT_USER_ID;
 		audio_input_device = s->value("audio_input_device", audio_input_device).toString();
+		const QColor color(s->value("controller_color", controller_color).toString());
+		controller_color = color.isValid() ? color.name(QColor::HexRgb) : QString {};
 		KYTY_CFG_GET(present_mode);
 		gpu_index = s->value("gpu_index", -1).toInt();
 		if (EnumToText(present_mode).isEmpty()) {

src/launcher/include/configurationEditDialog.h

@@ -31,6 +31,9 @@ public:
 	void                      SetGameDirectories(const QStringList& dirs);
 	[[nodiscard]] QStringList GetGameDirectories() const;
 
+signals:
+	void PreviewControllerColor(const QString& color);
+
 private:
 	Ui::ConfigurationEditDialog* m_ui = nullptr;
 	Configuration&               m_info;

src/launcher/include/configurationListWidget.h

@@ -33,6 +33,9 @@ public:
 	ConfigurationItem*                     GetSelectedItem() { return m_selected_item; }
 
 	[[nodiscard]] const QString& GetSettingsFile() const { return m_settings_file; }
+	[[nodiscard]] const QString& GetGlobalControllerColor() const {
+		return m_global_info.controller_color;
+	}
 	[[nodiscard]] std::unique_ptr<Configuration>
 	CreateConfiguration(const ConfigurationItem& item) const;
 
@@ -44,6 +47,7 @@ signals:
 
 	void Run();
 	void Select();
+	void PreviewControllerColor(const QString& color);
 
 protected:
 	void changeEvent(QEvent* event) override;

src/launcher/include/controllerLightbar.h

@@ -0,0 +1,29 @@
+#ifndef CONTROLLER_LIGHTBAR_H
+#define CONTROLLER_LIGHTBAR_H
+
+#include <QColor>
+#include <QHash>
+#include <QObject>
+#include <QString>
+#include <QTimer>
+
+#include <SDL3/SDL_gamepad.h>
+
+class ControllerLightbar final: public QObject {
+public:
+	explicit ControllerLightbar(QObject* parent = nullptr);
+	~ControllerLightbar() override;
+
+	void SetColor(const QString& color);
+	void Stop();
+
+private:
+	void Refresh();
+	void ApplyColor(SDL_Gamepad* gamepad) const;
+
+	QTimer                              m_timer;
+	QHash<SDL_JoystickID, SDL_Gamepad*> m_gamepads;
+	QColor                              m_color;
+};
+
+#endif // CONTROLLER_LIGHTBAR_H