NetPlay: Implement golf mode

This is an extension of host input authority that allows switching the
host (who has zero latency) on the fly, at the further expense of
everyone else's latency. This is useful for turn-based games where the
latency of players not on their turn doesn't matter.

To become the so-called golfer, the player simply presses a hotkey.
When the host is the golfer, latency is identical to normal host input
authority.

1 files changed, 26 insertions, 1 deletions

diff --git a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
index 9adafba0b4..206015ab82 100644
--- a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
+++ b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
@@ -85,6 +85,7 @@ NetPlayDialog::NetPlayDialog(QWidget* parent)
   const bool strict_settings_sync = Config::Get(Config::NETPLAY_STRICT_SETTINGS_SYNC);
   const bool host_input_authority = Config::Get(Config::NETPLAY_HOST_INPUT_AUTHORITY);
   const bool sync_all_wii_saves = Config::Get(Config::NETPLAY_SYNC_ALL_WII_SAVES);
+  const bool golf_mode = Config::Get(Config::NETPLAY_GOLF_MODE);
 
   m_buffer_size_box->setValue(buffer_size);
   m_save_sd_action->setChecked(write_save_sdcard_data);
@@ -96,6 +97,7 @@ NetPlayDialog::NetPlayDialog(QWidget* parent)
   m_strict_settings_sync_action->setChecked(strict_settings_sync);
   m_host_input_authority_action->setChecked(host_input_authority);
   m_sync_all_wii_saves_action->setChecked(sync_all_wii_saves);
+  m_golf_mode_action->setChecked(golf_mode);
 
   ConnectWidgets();
 
@@ -144,6 +146,8 @@ void NetPlayDialog::CreateMainLayout()
   m_reduce_polling_rate_action->setCheckable(true);
   m_host_input_authority_action = m_network_menu->addAction(tr("Host Input Authority"));
   m_host_input_authority_action->setCheckable(true);
+  m_golf_mode_action = m_network_menu->addAction(tr("Golf Mode"));
+  m_golf_mode_action->setCheckable(true);
 
   m_other_menu = m_menu_bar->addMenu(tr("Other"));
   m_record_input_action = m_other_menu->addAction(tr("Record Inputs"));
@@ -306,10 +310,12 @@ void NetPlayDialog::ConnectWidgets()
               client->AdjustPadBufferSize(value);
           });
 
-  connect(m_host_input_authority_action, &QAction::toggled, [](bool checked) {
+  connect(m_host_input_authority_action, &QAction::toggled, this, [=](bool checked) {
     auto server = Settings::Instance().GetNetPlayServer();
     if (server)
       server->SetHostInputAuthority(checked);
+
+    m_golf_mode_action->setEnabled(checked);
   });
 
   connect(m_start_button, &QPushButton::clicked, this, &NetPlayDialog::OnStart);
@@ -355,6 +361,7 @@ void NetPlayDialog::ConnectWidgets()
   connect(m_strict_settings_sync_action, &QAction::toggled, this, &NetPlayDialog::SaveSettings);
   connect(m_host_input_authority_action, &QAction::toggled, this, &NetPlayDialog::SaveSettings);
   connect(m_sync_all_wii_saves_action, &QAction::toggled, this, &NetPlayDialog::SaveSettings);
+  connect(m_golf_mode_action, &QAction::toggled, this, &NetPlayDialog::SaveSettings);
 }
 
 void NetPlayDialog::SendMessage(const std::string& msg)
@@ -482,6 +489,7 @@ void NetPlayDialog::OnStart()
   settings.m_SyncCodes = m_sync_codes_action->isChecked();
   settings.m_SyncAllWiiSaves =
       m_sync_all_wii_saves_action->isChecked() && m_sync_save_data_action->isChecked();
+  settings.m_GolfMode = m_golf_mode_action->isChecked();
 
   // Unload GameINI to restore things to normal
   Config::RemoveLayer(Config::LayerType::GlobalGame);
@@ -815,6 +823,7 @@ void NetPlayDialog::SetOptionsEnabled(bool enabled)
     m_strict_settings_sync_action->setEnabled(enabled);
     m_host_input_authority_action->setEnabled(enabled);
     m_sync_all_wii_saves_action->setEnabled(enabled && m_sync_save_data_action->isChecked());
+    m_golf_mode_action->setEnabled(enabled && m_host_input_authority_action->isChecked());
   }
 
   m_record_input_action->setEnabled(enabled);
@@ -881,6 +890,7 @@ void NetPlayDialog::OnHostInputAuthorityChanged(bool enabled)
 
       const QSignalBlocker blocker(m_host_input_authority_action);
       m_host_input_authority_action->setChecked(enabled);
+      m_golf_mode_action->setEnabled(enabled);
     }
     else
     {
@@ -956,6 +966,20 @@ void NetPlayDialog::OnSaveDataSyncFailure()
   QueueOnObject(this, [this] { SetOptionsEnabled(true); });
 }
 
+void NetPlayDialog::OnGolferChanged(const bool is_golfer, const std::string& golfer_name)
+{
+  if (m_host_input_authority)
+  {
+    QueueOnObject(this, [this, is_golfer] {
+      m_buffer_size_box->setEnabled(!is_golfer);
+      m_buffer_label->setEnabled(!is_golfer);
+    });
+  }
+
+  if (!golfer_name.empty())
+    DisplayMessage(tr("%1 is now golfing").arg(QString::fromStdString(golfer_name)), "");
+}
+
 bool NetPlayDialog::IsRecording()
 {
   std::optional<bool> is_recording = RunOnObject(m_record_input_action, &QAction::isChecked);
@@ -1013,6 +1037,7 @@ void NetPlayDialog::SaveSettings()
   Config::SetBase(Config::NETPLAY_STRICT_SETTINGS_SYNC, m_strict_settings_sync_action->isChecked());
   Config::SetBase(Config::NETPLAY_HOST_INPUT_AUTHORITY, m_host_input_authority_action->isChecked());
   Config::SetBase(Config::NETPLAY_SYNC_ALL_WII_SAVES, m_sync_all_wii_saves_action->isChecked());
+  Config::SetBase(Config::NETPLAY_GOLF_MODE, m_golf_mode_action->isChecked());
 }
 
 void NetPlayDialog::ShowMD5Dialog(const std::string& file_identifier)