Disable Vsync while holding tab to disable the frame limit, and allow toggling vsync while emulation is running in OGL.

D3D9 still doesn't support changing vsync while emulation is running.

Fixes issue 6111.

Source/Core/Core/Src/Core.cpp

@@ -104,6 +104,7 @@ static bool g_requestRefreshInfo = false;
 static int g_pauseAndLockDepth = 0;
 
 SCoreStartupParameter g_CoreStartupParameter;
+bool isTabPressed = false;
 
 std::string GetStateFileName() { return g_stateFileName; }
 void SetStateFileName(std::string val) { g_stateFileName = val; }
@@ -603,9 +604,13 @@ void VideoThrottle()
 	u32 TargetVPS = (SConfig::GetInstance().m_Framelimit > 2) ?
 		(SConfig::GetInstance().m_Framelimit - 1) * 5 : VideoInterface::TargetRefreshRate;
 
+	if (Host_GetKeyState('\t'))
+		isTabPressed = true;
+
 	// Disable the frame-limiter when the throttle (Tab) key is held down. Audio throttle: m_Framelimit = 2
 	if (SConfig::GetInstance().m_Framelimit && SConfig::GetInstance().m_Framelimit != 2 && !Host_GetKeyState('\t'))
 	{
+		isTabPressed = false;
 		u32 frametime = ((SConfig::GetInstance().b_UseFPS)? Common::AtomicLoad(DrawnFrame) : DrawnVideo) * 1000 / TargetVPS;
 
 		u32 timeDifference = (u32)Timer.GetTimeDifference();

Source/Core/Core/Src/Core.h

@@ -38,6 +38,8 @@ namespace Core
 // TODO: kill, use SConfig instead
 extern SCoreStartupParameter g_CoreStartupParameter;
 
+extern bool isTabPressed;
+
 void Callback_VideoCopiedToXFB(bool video_update);
 
 enum EState

Source/Core/VideoCommon/Src/VideoConfig.cpp

@@ -22,6 +22,7 @@
 #include "VideoConfig.h"
 #include "VideoCommon.h"
 #include "FileUtil.h"
+#include "Core.h"
 
 VideoConfig g_Config;
 VideoConfig g_ActiveConfig;
@@ -292,3 +293,8 @@ void VideoConfig::GameIniSave(const char* default_ini, const char* game_ini)
 
 	iniFile.Save(game_ini);
 }
+
+bool VideoConfig::IsVSync()
+{
+	return Core::isTabPressed ? false : bVSync;
+}

Source/Core/VideoCommon/Src/VideoConfig.h

@@ -67,6 +67,7 @@ struct VideoConfig
 	void Save(const char *ini_file);
 	void GameIniSave(const char* default_ini, const char* game_ini);
 	void UpdateProjectionHack();
+	bool IsVSync();
 
 	// General
 	bool bVSync;

Source/Plugins/Plugin_VideoDX11/Src/D3DBase.cpp

@@ -520,7 +520,7 @@ void EndFrame()
 void Present()
 {
 	// TODO: Is 1 the correct value for vsyncing?
-	swapchain->Present((UINT)g_ActiveConfig.bVSync, 0);
+	swapchain->Present((UINT)g_ActiveConfig.IsVSync(), 0);
 }
 
 }  // namespace D3D

Source/Plugins/Plugin_VideoDX9/Src/D3DBase.cpp

@@ -223,7 +223,7 @@ void InitPP(int adapter, int f, int aa_mode, D3DPRESENT_PARAMETERS *pp)
 		yres = pp->BackBufferHeight = client.bottom - client.top;
 	}
 	pp->SwapEffect = D3DSWAPEFFECT_DISCARD;
-	pp->PresentationInterval = g_Config.bVSync ? D3DPRESENT_INTERVAL_DEFAULT : D3DPRESENT_INTERVAL_IMMEDIATE;
+	pp->PresentationInterval = g_Config.IsVSync() ? D3DPRESENT_INTERVAL_DEFAULT : D3DPRESENT_INTERVAL_IMMEDIATE;
 	pp->Windowed = !g_Config.b3DVision;
 }
 

Source/Plugins/Plugin_VideoOGL/Src/Render.cpp

@@ -314,7 +314,7 @@ Renderer::Renderer()
 	s_backbuffer_height = (int)GLInterface->GetBackBufferHeight();
 
 	// Handle VSync on/off
-	int swapInterval = g_ActiveConfig.bVSync ? 1 : 0;
+	int swapInterval = g_ActiveConfig.IsVSync() ? 1 : 0;
 	GLInterface->SwapInterval(swapInterval);
 
 	// check the max texture width and height
@@ -1307,6 +1307,8 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 
 	GL_REPORT_ERRORD();
 
+	GLInterface->SwapInterval(g_ActiveConfig.IsVSync() ? 1 : 0);
+
 	// Clean out old stuff from caches. It's not worth it to clean out the shader caches.
 	DLCache::ProgressiveCleanup();
 	TextureCache::Cleanup();