Add frameskip setting by percent of current FPS

Core/Config.cpp

@@ -621,6 +621,7 @@ static ConfigSetting graphicsSettings[] = {
 	ReportedConfigSetting("AndroidHwScale", &g_Config.iAndroidHwScale, &DefaultAndroidHwScale),
 	ReportedConfigSetting("HighQualityDepth", &g_Config.bHighQualityDepth, true, true, true),
 	ReportedConfigSetting("FrameSkip", &g_Config.iFrameSkip, 0, true, true),
+	ReportedConfigSetting("FrameSkipType", &g_Config.iFrameSkipType, 0, true, true),
 	ReportedConfigSetting("AutoFrameSkip", &g_Config.bAutoFrameSkip, false, true, true),
 	ConfigSetting("FrameRate", &g_Config.iFpsLimit1, 0, true, true),
 	ConfigSetting("FrameRate2", &g_Config.iFpsLimit2, -1, true, true),

Core/Config.h

@@ -143,6 +143,7 @@ struct Config {
 	bool bSustainedPerformanceMode;  // Android: Slows clocks down to avoid overheating/speed fluctuations.
 	bool bVSync;
 	int iFrameSkip;
+	int iFrameSkipType;
 	bool bAutoFrameSkip;
 	bool bFrameSkipUnthrottle;
 

Core/HLE/sceDisplay.cpp

@@ -503,6 +503,18 @@ static void DoFrameDropLogging(float scaledTimestep) {
 	}
 }
 
+static int CalculateFrameSkip() {
+	int frameSkipNum;
+	if (g_Config.iFrameSkipType == 1) { 
+		// Calculate the frames to skip dynamically using the set percentage of the current fps
+		frameSkipNum = ceil( flips * (static_cast<double>(g_Config.iFrameSkip) / 100.00) ); 
+	} else { 
+		// Use the set number of frames to skip
+		frameSkipNum = g_Config.iFrameSkip; 
+	}
+	return frameSkipNum;
+}
+
 // Let's collect all the throttling and frameskipping logic here.
 static void DoFrameTiming(bool &throttle, bool &skipFrame, float timestep) {
 	PROFILE_THIS_SCOPE("timing");
@@ -553,15 +565,16 @@ static void DoFrameTiming(bool &throttle, bool &skipFrame, float timestep) {
 	// Auto-frameskip automatically if speed limit is set differently than the default.
 	bool useAutoFrameskip = g_Config.bAutoFrameSkip && g_Config.iRenderingMode != FB_NON_BUFFERED_MODE;
 	bool forceFrameskip = (fpsLimiter == FPSLimit::CUSTOM1 && g_Config.iFpsLimit1 > 60) || (fpsLimiter == FPSLimit::CUSTOM2 && g_Config.iFpsLimit2 > 60);
+	int frameSkipNum = CalculateFrameSkip();
 	if (g_Config.bAutoFrameSkip || forceFrameskip) {
 		// autoframeskip
 		// Argh, we are falling behind! Let's skip a frame and see if we catch up.
 		if (curFrameTime > nextFrameTime && doFrameSkip) {
 			skipFrame = true;
 		}
-	} else if (g_Config.iFrameSkip >= 1) {
+	} else if (frameSkipNum >= 1) {
 		// fixed frameskip
-		if (numSkippedFrames >= g_Config.iFrameSkip)
+		if (numSkippedFrames >= frameSkipNum)
 			skipFrame = false;
 		else
 			skipFrame = true;
@@ -734,9 +747,10 @@ void __DisplayFlip(int cyclesLate) {
 		DoFrameTiming(throttle, skipFrame, (float)numVBlanksSinceFlip * timePerVblank);
 
 		int maxFrameskip = 8;
+		int frameSkipNum = CalculateFrameSkip();
 		if (throttle) {
 			// 4 here means 1 drawn, 4 skipped - so 12 fps minimum.
-			maxFrameskip = g_Config.iFrameSkip;
+			maxFrameskip = frameSkipNum;
 		}
 		if (numSkippedFrames >= maxFrameskip || GPURecord::IsActivePending()) {
 			skipFrame = false;

Qt/mainwindow.cpp

@@ -511,6 +511,8 @@ void MainWindow::createMenus()
 		->addEventChecked(&g_Config.bVertexCache);
 	videoMenu->add(new MenuAction(this, SLOT(frameskipAct()),     QT_TR_NOOP("&Frameskip")))
 		->addEventChecked(&g_Config.iFrameSkip);
+	videoMenu->add(new MenuAction(this, SLOT(frameskipTypeAct()),     QT_TR_NOOP("&FrameSkipType")))
+		->addEventChecked(&g_Config.iFrameSkipType);
 	optionsMenu->add(new MenuAction(this, SLOT(audioAct()),   QT_TR_NOOP("&Audio")))
 		->addEventChecked(&g_Config.bEnableSound);
 	optionsMenu->addSeparator();

Qt/mainwindow.h

@@ -114,6 +114,7 @@ private slots:
 	void transformAct() { g_Config.bHardwareTransform = !g_Config.bHardwareTransform; }
 	void vertexCacheAct() { g_Config.bVertexCache = !g_Config.bVertexCache; }
 	void frameskipAct() { g_Config.iFrameSkip = !g_Config.iFrameSkip; }
+	void frameskipTypeAct() { g_Config.iFrameSkipType = !g_Config.iFrameSkipType; }
 
 	// Sound
 	void audioAct() { g_Config.bEnableSound = !g_Config.bEnableSound; }

UI/GameSettingsScreen.cpp

@@ -275,6 +275,8 @@ void GameSettingsScreen::CreateViews() {
 	graphicsSettings->Add(new ItemHeader(gr->T("Frame Rate Control")));
 	static const char *frameSkip[] = {"Off", "1", "2", "3", "4", "5", "6", "7", "8"};
 	graphicsSettings->Add(new PopupMultiChoice(&g_Config.iFrameSkip, gr->T("Frame Skipping"), frameSkip, 0, ARRAY_SIZE(frameSkip), gr->GetName(), screenManager()));
+	static const char *frameSkipType[] = {"Number of Frames", "Percent of FPS"};
+	graphicsSettings->Add(new PopupMultiChoice(&g_Config.iFrameSkipType, gr->T("Frame Skipping Type"), frameSkipType, 0, ARRAY_SIZE(frameSkipType), gr->GetName(), screenManager()));
 	frameSkipAuto_ = graphicsSettings->Add(new CheckBox(&g_Config.bAutoFrameSkip, gr->T("Auto FrameSkip")));
 	frameSkipAuto_->OnClick.Handle(this, &GameSettingsScreen::OnAutoFrameskip);
 	graphicsSettings->Add(new CheckBox(&cap60FPS_, gr->T("Force max 60 FPS (helps GoW)")));

Windows/MainWindow.h

@@ -35,6 +35,9 @@ namespace MainWindow
 		FRAMESKIP_8 = 8,
 		FRAMESKIP_MAX = FRAMESKIP_8,
 
+		FRAMESKIPTYPE_COUNT = 0,
+		FRAMESKIPTYPE_PRCNT = 1,
+
 		RESOLUTION_AUTO = 0,
 		RESOLUTION_NATIVE = 1,
 		RESOLUTION_2X = 2,

Windows/MainWindowMenu.cpp

@@ -337,6 +337,8 @@ namespace MainWindow {
 		TranslateSubMenu(menu, "Frame Skipping", MENU_OPTIONS, SUBMENU_FRAME_SKIPPING, L"\tF7");
 		TranslateMenuItem(menu, ID_OPTIONS_FRAMESKIP_AUTO);
 		TranslateMenuItem(menu, ID_OPTIONS_FRAMESKIP_0);
+		TranslateMenuItem(menu, ID_OPTIONS_FRAMESKIPTYPE_COUNT);
+		TranslateMenuItem(menu, ID_OPTIONS_FRAMESKIPTYPE_PRCNT);
 		// Skip frameskipping 1-8..
 		TranslateSubMenu(menu, "Texture Filtering", MENU_OPTIONS, SUBMENU_TEXTURE_FILTERING);
 		TranslateMenuItem(menu, ID_OPTIONS_TEXTUREFILTERING_AUTO);
@@ -542,6 +544,26 @@ namespace MainWindow {
 		osm.Show(messageStream.str());
 	}
 
+	static void setFrameSkippingType(int fskipType = -1) {
+		if (fskipType >= 0 && fskipType <= 1) {
+			g_Config.iFrameSkipType = fskipType;
+		} else {
+			g_Config.iFrameSkipType = 0;
+		}
+
+		I18NCategory *gr = GetI18NCategory("Graphics");
+
+		std::ostringstream messageStream;
+		messageStream << gr->T("Frame Skipping Type") << ":" << " ";
+
+		if (g_Config.iFrameSkipType == 0)
+			messageStream << gr->T("Number of Frames");
+		else
+			messageStream << gr->T("Percent of FPS");
+
+		osm.Show(messageStream.str());
+	}
+
 	static void enableCheats(bool cheats) {
 		g_Config.bEnableCheats = cheats;
 	}
@@ -825,8 +847,12 @@ namespace MainWindow {
 		case ID_OPTIONS_FRAMESKIP_7:    setFrameSkipping(FRAMESKIP_7); break;
 		case ID_OPTIONS_FRAMESKIP_8:    setFrameSkipping(FRAMESKIP_MAX); break;
 
+		case ID_OPTIONS_FRAMESKIPTYPE_COUNT:    setFrameSkippingType(FRAMESKIPTYPE_COUNT); break;
+		case ID_OPTIONS_FRAMESKIPTYPE_PRCNT:    setFrameSkippingType(FRAMESKIPTYPE_PRCNT); break;
+
 		case ID_OPTIONS_FRAMESKIPDUMMY:
 			setFrameSkipping();
+			setFrameSkippingType();
 			break;
 
 		case ID_FILE_EXIT:
@@ -1076,6 +1102,8 @@ namespace MainWindow {
 		CHECKITEM(ID_OPTIONS_SHOWFPS, g_Config.iShowFPSCounter);
 		CHECKITEM(ID_OPTIONS_FRAMESKIP_AUTO, g_Config.bAutoFrameSkip);
 		CHECKITEM(ID_OPTIONS_FRAMESKIP, g_Config.iFrameSkip != FRAMESKIP_OFF);
+		CHECKITEM(ID_OPTIONS_FRAMESKIPTYPE_COUNT, g_Config.iFrameSkipType == FRAMESKIPTYPE_COUNT);
+		CHECKITEM(ID_OPTIONS_FRAMESKIPTYPE_PRCNT, g_Config.iFrameSkipType == FRAMESKIPTYPE_PRCNT);
 		CHECKITEM(ID_OPTIONS_VSYNC, g_Config.bVSync);
 		CHECKITEM(ID_OPTIONS_TOPMOST, g_Config.bTopMost);
 		CHECKITEM(ID_OPTIONS_PAUSE_FOCUS, g_Config.bPauseOnLostFocus);
@@ -1248,6 +1276,12 @@ namespace MainWindow {
 			ID_OPTIONS_FRAMESKIP_7,
 			ID_OPTIONS_FRAMESKIP_8,
 		};
+
+		static const int frameskippingType[] = {
+			ID_OPTIONS_FRAMESKIPTYPE_COUNT,
+			ID_OPTIONS_FRAMESKIPTYPE_PRCNT,
+		};
+
 		if (g_Config.iFrameSkip < FRAMESKIP_OFF)
 			g_Config.iFrameSkip = FRAMESKIP_OFF;
 
@@ -1258,6 +1292,10 @@ namespace MainWindow {
 			CheckMenuItem(menu, frameskipping[i], MF_BYCOMMAND | ((i == g_Config.iFrameSkip) ? MF_CHECKED : MF_UNCHECKED));
 		}
 
+		for (int i = 0; i < ARRAY_SIZE(frameskippingType); i++) {
+			CheckMenuItem(menu, frameskippingType[i], MF_BYCOMMAND | ((i == g_Config.iFrameSkipType) ? MF_CHECKED : MF_UNCHECKED));
+		}
+
 		static const int savestateSlot[] = {
 			ID_FILE_SAVESTATE_SLOT_1,
 			ID_FILE_SAVESTATE_SLOT_2,

Windows/ppsspp.rc

@@ -589,6 +589,11 @@ BEGIN
             MENUITEM "&7",                                  ID_OPTIONS_FRAMESKIP_7
             MENUITEM "&8",                                  ID_OPTIONS_FRAMESKIP_8
         END
+        POPUP "Frame Skipping Type"
+        BEGIN
+            MENUITEM "Skip Number of Frames",               ID_OPTIONS_FRAMESKIPTYPE_COUNT
+            MENUITEM "Skip Percent of FPS",                 ID_OPTIONS_FRAMESKIPTYPE_PRCNT
+        END
         POPUP "Texture Filtering"
         BEGIN
             MENUITEM "Auto",                                ID_OPTIONS_TEXTUREFILTERING_AUTO

Windows/resource.h

@@ -343,6 +343,8 @@
 #define ID_EMULATION_PAUSE               40177
 #define ID_HELP_DISCORD                  40178
 #define IDC_GEDBG_STEPCURVE              40179
+#define ID_OPTIONS_FRAMESKIPTYPE_COUNT   40180
+#define ID_OPTIONS_FRAMESKIPTYPE_PRCNT   40181
 
 // Dummy option to let the buffered rendering hotkey cycle through all the options.
 #define ID_OPTIONS_BUFFEREDRENDERINGDUMMY 40500

libretro/libretro.cpp

@@ -170,6 +170,7 @@ static RetroOption<int> ppsspp_rendering_mode("ppsspp_rendering_mode", "Renderin
 static RetroOption<bool> ppsspp_true_color("ppsspp_true_color", "True Color Depth", true);
 static RetroOption<bool> ppsspp_auto_frameskip("ppsspp_auto_frameskip", "Auto Frameskip", false);
 static RetroOption<int> ppsspp_frameskip("ppsspp_frameskip", "Frameskip", 0, 10);
+static RetroOption<int> ppsspp_frameskiptype("ppsspp_frameskiptype", "Frameskip Type", 0, 10);
 static RetroOption<int> ppsspp_force_max_fps("ppsspp_force_max_fps", "Force Max FPS", { { "disabled", 0 }, { "enabled", 60 } });
 static RetroOption<int> ppsspp_audio_latency("ppsspp_audio_latency", "Audio latency", { "low", "medium", "high" });
 static RetroOption<int> ppsspp_internal_resolution("ppsspp_internal_resolution", "Internal Resolution", 1, { "480x272", "960x544", "1440x816", "1920x1088", "2400x1360", "2880x1632", "3360x1904", "3840x2176", "4320x2448", "4800x2720" });
@@ -198,6 +199,7 @@ void retro_set_environment(retro_environment_t cb) {
 	vars.push_back(ppsspp_true_color.GetOptions());
 	vars.push_back(ppsspp_auto_frameskip.GetOptions());
 	vars.push_back(ppsspp_frameskip.GetOptions());
+	vars.push_back(ppsspp_frameskiptype.GetOptions());
 	vars.push_back(ppsspp_force_max_fps.GetOptions());
 	vars.push_back(ppsspp_audio_latency.GetOptions());
 	vars.push_back(ppsspp_internal_resolution.GetOptions());
@@ -268,6 +270,7 @@ static void check_variables(CoreParameter &coreParam) {
 	ppsspp_vertex_cache.Update(&g_Config.bVertexCache);
 	ppsspp_gpu_hardware_transform.Update(&g_Config.bHardwareTransform);
 	ppsspp_frameskip.Update(&g_Config.iFrameSkip);
+	ppsspp_frameskiptype.Update(&g_Config.iFrameSkipType);
 	ppsspp_audio_latency.Update(&g_Config.iAudioLatency);
 	ppsspp_true_color.Update(&g_Config.bTrueColor);
 	ppsspp_auto_frameskip.Update(&g_Config.bAutoFrameSkip);