Qt: Allow passing multiple games on command line for multiplayer (closes #3061)

CHANGES

@@ -47,6 +47,7 @@ Misc:
  - Qt: Pass logging context through to video proxy thread (fixes mgba.io/i/3095)
  - Qt: Show maker code and game version in ROM info
  - Qt: Show a dummy shader settings tab if shaders aren't supported
+ - Qt: Allow passing multiple games on command line for multiplayer (closes mgba.io/i/3061)
  - Res: Port NSO-gba-colors shader (closes mgba.io/i/2834)
  - Scripting: Add `callbacks:oneshot` for single-call callbacks
  - Updater: Fix rewriting folders and files on Windows (fixes mgba.io/i/3384)

src/platform/qt/ConfigController.cpp

@@ -196,6 +196,14 @@ ConfigController::ConfigController(QObject* parent)
 	m_subparsers[1].extraOptions = nullptr;
 	m_subparsers[1].longOptions = s_frontendOptions;
 	m_subparsers[1].opts = this;
+	m_subparsers[1].handleExtraArg = [](struct mSubParser* parser, const char* arg) {
+		ConfigController* self = static_cast<ConfigController*>(parser->opts);
+		if (self->m_fnames.count() >= MAX_GBAS) {
+			return false;
+		}
+		self->m_fnames.append(QString::fromUtf8(arg));
+		return true;
+	};
 }
 
 ConfigController::~ConfigController() {

src/platform/qt/ConfigController.h

@@ -102,6 +102,7 @@ public:
 
 	const mArguments* args() const { return &m_args; }
 	const mGraphicsOpts* graphicsOpts() const { return &m_graphicsOpts; }
+	QStringList fileNames() const { return m_fnames; }
 	void usage(const char* arg0) const;
 
 	static const QString& configDir();
@@ -129,6 +130,7 @@ private:
 	mArguments m_args{};
 	mGraphicsOpts m_graphicsOpts{};
 	std::array<mSubParser, 2> m_subparsers;
+	QStringList m_fnames;
 	bool m_parsed = false;
 
 	QHash<QString, QVariant> m_argvOptions;

src/platform/qt/GBAApp.cpp

@@ -397,6 +397,26 @@ void GBAApp::finishJob(qint64 jobId) {
 	m_workerJobCallbacks.remove(jobId);
 }
 
+void GBAApp::initMultiplayer() {
+	QStringList fnames = m_configController->fileNames();
+	if (fnames.count() < 2) {
+		return;
+	}
+
+	Window* w = m_windows[0];
+	for (const auto& fname : fnames) {
+		if (!w) {
+			w = newWindow();
+		}
+		if (!w) {
+			break;
+		}
+		CoreController* core = m_manager.loadGame(fname);
+		w->setController(core, fname);
+		w = nullptr;
+	}
+}
+
 GBAApp::WorkerJob::WorkerJob(qint64 id, std::function<void ()>&& job, GBAApp* owner)
 	: m_id(id)
 	, m_job(std::move(job))

src/platform/qt/GBAApp.h

@@ -82,6 +82,8 @@ public:
 	ApplicationUpdater* updater() { return &m_updater; }
 	QString invokeOnExit() { return m_invokeOnExit; }
 
+	void initMultiplayer();
+
 public slots:
 	void restartForUpdate();
 	Window* newWindow();

src/platform/qt/main.cpp

@@ -131,10 +131,9 @@ int main(int argc, char* argv[]) {
 	}
 
 	Window* w = application.newWindow();
-	w->loadConfig();
 	w->argumentsPassed();
 
-	w->show();
+	application.initMultiplayer();
 
 	int ret = application.exec();
 	if (ret != 0) {