Add settings option to disable V-sync for lowest possible latency on Windows

app/gui/SettingsView.qml

@@ -230,6 +230,7 @@ ScrollView {
                     }
                 }
 
+                Row {
                     CheckBox {
                         id: fullScreenCheck
                         text: "<font color=\"white\">Full-screen</font>"
@@ -239,6 +240,18 @@ ScrollView {
                             prefs.fullScreen = checked
                         }
                     }
+
+                    CheckBox {
+                        id: vsyncCheck
+                        text: "<font color=\"white\">Enable V-Sync</font>"
+                        font.pointSize:  12
+                        visible: fullScreenCheck.checked
+                        checked: prefs.enableVsync
+                        onCheckedChanged: {
+                            prefs.enableVsync = checked
+                        }
+                    }
+                }
             }
         }
 

app/settings/streamingpreferences.cpp

@@ -9,6 +9,7 @@
 #define SER_FPS "fps"
 #define SER_BITRATE "bitrate"
 #define SER_FULLSCREEN "fullscreen"
+#define SER_VSYNC "vsync"
 #define SER_GAMEOPTS "gameopts"
 #define SER_HOSTAUDIO "hostaudio"
 #define SER_MULTICONT "multicontroller"
@@ -30,6 +31,7 @@ void StreamingPreferences::reload()
     fps = settings.value(SER_FPS, 60).toInt();
     bitrateKbps = settings.value(SER_BITRATE, getDefaultBitrate(width, height, fps)).toInt();
     fullScreen = settings.value(SER_FULLSCREEN, true).toBool();
+    enableVsync = settings.value(SER_VSYNC, true).toBool();
     gameOptimizations = settings.value(SER_GAMEOPTS, true).toBool();
     playAudioOnHost = settings.value(SER_HOSTAUDIO, false).toBool();
     multiController = settings.value(SER_MULTICONT, true).toBool();
@@ -50,6 +52,7 @@ void StreamingPreferences::save()
     settings.setValue(SER_FPS, fps);
     settings.setValue(SER_BITRATE, bitrateKbps);
     settings.setValue(SER_FULLSCREEN, fullScreen);
+    settings.setValue(SER_VSYNC, enableVsync);
     settings.setValue(SER_GAMEOPTS, gameOptimizations);
     settings.setValue(SER_HOSTAUDIO, playAudioOnHost);
     settings.setValue(SER_MULTICONT, multiController);

app/settings/streamingpreferences.h

@@ -55,6 +55,7 @@ public:
     Q_PROPERTY(int fps MEMBER fps NOTIFY displayModeChanged)
     Q_PROPERTY(int bitrateKbps MEMBER bitrateKbps NOTIFY bitrateChanged)
     Q_PROPERTY(bool fullScreen MEMBER fullScreen NOTIFY fullScreenChanged)
+    Q_PROPERTY(bool enableVsync MEMBER enableVsync NOTIFY enableVsyncChanged)
     Q_PROPERTY(bool gameOptimizations MEMBER gameOptimizations NOTIFY gameOptimizationsChanged)
     Q_PROPERTY(bool playAudioOnHost MEMBER playAudioOnHost NOTIFY playAudioOnHostChanged)
     Q_PROPERTY(bool multiController MEMBER multiController NOTIFY multiControllerChanged)
@@ -68,6 +69,7 @@ public:
     int fps;
     int bitrateKbps;
     bool fullScreen;
+    bool enableVsync;
     bool gameOptimizations;
     bool playAudioOnHost;
     bool multiController;
@@ -79,6 +81,7 @@ signals:
     void displayModeChanged();
     void bitrateChanged();
     void fullScreenChanged();
+    void enableVsyncChanged();
     void gameOptimizationsChanged();
     void playAudioOnHostChanged();
     void multiControllerChanged();

app/streaming/session.cpp

@@ -834,7 +834,7 @@ void Session::exec()
             if (!chooseDecoder(m_Preferences.videoDecoderSelection,
                                m_Window, m_ActiveVideoFormat, m_ActiveVideoWidth,
                                m_ActiveVideoHeight, m_ActiveVideoFrameRate,
-                               true, // TODO: User configuration for V-sync
+                               m_Preferences.enableVsync,
                                s_ActiveSession->m_VideoDecoder)) {
                 SDL_AtomicUnlock(&m_DecoderLock);
                 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,