Qt: Support changing running GS dump by drag/dropping

pcsx2-qt/MainWindow.cpp

@@ -2065,7 +2065,7 @@ static QString getFilenameFromMimeData(const QMimeData* md)
 		// only one url accepted
 		const QList<QUrl> urls(md->urls());
 		if (urls.size() == 1)
-			filename = urls.front().toLocalFile();
+			filename = QDir::toNativeSeparators(urls.front().toLocalFile());
 	}
 
 	return filename;
@@ -2925,11 +2925,23 @@ void MainWindow::doStartFile(std::optional<CDVD_SourceType> source, const QStrin
 
 void MainWindow::doDiscChange(CDVD_SourceType source, const QString& path)
 {
+	const bool is_gs_dump = VMManager::IsGSDumpFileName(path.toStdString());
+	if (is_gs_dump != GSDumpReplayer::IsReplayingDump())
+	{
+		QMessageBox::critical(this, tr("Error"), tr("Cannot switch from game to GS dump or vice versa."));
+		return;
+	}
+	else if (is_gs_dump)
+	{
+		Host::RunOnCPUThread([path = path.toStdString()]() { GSDumpReplayer::ChangeDump(path.c_str()); });
+		return;
+	}
+
 	bool reset_system = false;
 	if (!m_was_disc_change_request)
 	{
 		QMessageBox message(QMessageBox::Question, tr("Confirm Disc Change"),
-			tr("Do you want to swap discs or boot the new image (via system reset)?"));
+			tr("Do you want to swap discs or boot the new image (via system reset)?"), QMessageBox::NoButton, this);
 		message.addButton(tr("Swap Disc"), QMessageBox::ActionRole);
 		QPushButton* reset_button = message.addButton(tr("Reset"), QMessageBox::ActionRole);
 		QPushButton* cancel_button = message.addButton(QMessageBox::Cancel);

pcsx2/GSDumpReplayer.cpp

@@ -101,7 +101,7 @@ int GSDumpReplayer::GetLoopCount()
 bool GSDumpReplayer::Initialize(const char* filename)
 {
 	Common::Timer timer;
-	Console.WriteLn("(GSDumpReplayer) Reading file...");
+	Console.WriteLn("(GSDumpReplayer) Reading file '%s'...", filename);
 
 	s_dump_file = GSDumpFile::OpenGSDump(filename);
 	if (!s_dump_file || !s_dump_file->ReadFile())
@@ -125,6 +125,25 @@ bool GSDumpReplayer::Initialize(const char* filename)
 	return true;
 }
 
+bool GSDumpReplayer::ChangeDump(const char* filename)
+{
+	Console.WriteLn("(GSDumpReplayer) Switching to '%s'...", filename);
+
+	std::unique_ptr<GSDumpFile> new_dump(GSDumpFile::OpenGSDump(filename));
+	if (!new_dump || !new_dump->ReadFile())
+	{
+		Host::ReportFormattedErrorAsync("GSDumpReplayer", "Failed to open or read '%s'.", filename);
+		return false;
+	}
+
+	s_dump_file = std::move(new_dump);
+	s_current_packet = 0;
+
+	// Don't forget to reset the GS!
+	GSDumpReplayerCpuReset();
+	return true;
+}
+
 void GSDumpReplayer::Reset()
 {
 	GSDumpReplayerCpuReset();
@@ -185,6 +204,7 @@ void GSDumpReplayerCpuReset()
 	s_needs_state_loaded = true;
 	s_current_packet = 0;
 	s_dump_frame_number = 0;
+	hwReset();
 }
 
 static void GSDumpReplayerLoadInitialState()

pcsx2/GSDumpReplayer.h

@@ -30,6 +30,7 @@ bool IsRunner();
 void SetIsDumpRunner(bool is_runner);
 
 bool Initialize(const char* filename);
+bool ChangeDump(const char* filename);
 void Reset();
 void Shutdown();