Qt: Split GPU options into display and enhancements

src/duckstation-qt/displaysettingswidget.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <QtWidgets/QWidget>
+
+#include "ui_displaysettingswidget.h"
+
+class QtHostInterface;
+class SettingsDialog;
+
+class DisplaySettingsWidget : public QWidget
+{
+  Q_OBJECT
+
+public:
+  DisplaySettingsWidget(QtHostInterface* host_interface, QWidget* parent, SettingsDialog* dialog);
+  ~DisplaySettingsWidget();
+
+private Q_SLOTS:
+  void populateGPUAdapters();
+  void onGPUAdapterIndexChanged();
+
+private:
+  void setupAdditionalUi();
+
+  Ui::DisplaySettingsWidget m_ui;
+
+  QtHostInterface* m_host_interface;
+};