VideoConfig: Add exclusive mode flag.

Allows the UI to easily check the current exclusive mode state.
This simplifies a few checks and prevents the user from ever getting stuck in fullscreen.

Source/Core/DolphinWX/Frame.cpp

@@ -1319,13 +1319,11 @@ void CFrame::OnMouse(wxMouseEvent& event)
 
 void CFrame::DoFullscreen(bool enable_fullscreen)
 {
-	if (g_Config.ExclusiveFullscreenEnabled() &&
-		!SConfig::GetInstance().m_LocalCoreStartupParameter.bRenderToMain &&
-		Core::GetState() == Core::CORE_PAUSE)
+	if (g_Config.bExclusiveMode && Core::GetState() == Core::CORE_PAUSE)
 	{
 		// A responsive renderer is required for exclusive fullscreen, but the
 		// renderer can only respond in the running state. Therefore we ignore
-		// fullscreen switches if we support exclusive fullscreen, but the
+		// fullscreen switches if we are in exclusive fullscreen, but the
 		// renderer is not running.
 		// TODO: Allow the renderer to switch fullscreen modes while paused.
 		return;
@@ -1346,11 +1344,10 @@ void CFrame::DoFullscreen(bool enable_fullscreen)
 	{
 		m_RenderFrame->ShowFullScreen(true, wxFULLSCREEN_ALL);
 	}
-	else if (!g_Config.ExclusiveFullscreenEnabled() ||
-		SConfig::GetInstance().m_LocalCoreStartupParameter.bRenderToMain)
+	else if (!g_Config.bExclusiveMode)
 	{
 		// Exiting exclusive fullscreen should be done from a Renderer callback.
-		// Therefore we don't exit fullscreen from here if we support exclusive mode.
+		// Therefore we don't exit fullscreen from here if we are in exclusive mode.
 		m_RenderFrame->ShowFullScreen(false, wxFULLSCREEN_ALL);
 	}
 #endif

Source/Core/VideoBackends/D3D/Render.cpp

@@ -43,7 +43,6 @@ namespace DX11
 static u32 s_last_multisample_mode = 0;
 static bool s_last_stereo_mode = false;
 static bool s_last_xfb_mode = false;
-static bool s_last_fullscreen = false;
 
 static Television s_television;
 
@@ -231,7 +230,6 @@ Renderer::Renderer(void *&window_handle)
 	s_last_efb_scale = g_ActiveConfig.iEFBScale;
 	s_last_stereo_mode = g_ActiveConfig.iStereoMode > 0;
 	s_last_xfb_mode = g_ActiveConfig.bUseRealXFB;
-	s_last_fullscreen = g_ActiveConfig.bFullscreen;
 	CalculateTargetSize(s_backbuffer_width, s_backbuffer_height);
 
 	SetupDeviceObjects();
@@ -887,16 +885,16 @@ void Renderer::SwapImpl(u32 xfbAddr, u32 fbWidth, u32 fbStride, u32 fbHeight, co
 	{
 		if (fullscreen && !exclusive_mode)
 		{
-			if (s_last_fullscreen)
+			if (g_Config.bExclusiveMode)
 				OSD::AddMessage("Lost exclusive fullscreen.");
 
-			s_last_fullscreen = false;
-
 			// Exclusive fullscreen is enabled in the configuration, but we're
 			// not in exclusive mode. Either exclusive fullscreen was turned on
 			// or the render frame lost focus. When the render frame is in focus
 			// we can apply exclusive mode.
 			fullscreen_changed = Host_RendererHasFocus();
+
+			g_Config.bExclusiveMode = false;
 		}
 		else if (!fullscreen && exclusive_mode)
 		{
@@ -922,7 +920,7 @@ void Renderer::SwapImpl(u32 xfbAddr, u32 fbWidth, u32 fbStride, u32 fbHeight, co
 			// Apply fullscreen state
 			if (fullscreen_changed)
 			{
-				s_last_fullscreen = fullscreen;
+				g_Config.bExclusiveMode = fullscreen;
 
 				if (fullscreen)
 					OSD::AddMessage("Entered exclusive fullscreen.");

Source/Core/VideoCommon/VideoConfig.cpp

@@ -28,7 +28,10 @@ void UpdateActiveConfig()
 VideoConfig::VideoConfig()
 {
 	bRunning = false;
+
+	// Exclusive fullscreen flags
 	bFullscreen = false;
+	bExclusiveMode = false;
 
 	// Needed for the first frame, I think
 	fAspectRatioHackW = 1;

Source/Core/VideoCommon/VideoConfig.h

@@ -67,6 +67,7 @@ struct VideoConfig final
 	// General
 	bool bVSync;
 	bool bFullscreen;
+	bool bExclusiveMode;
 	bool bRunning;
 	bool bWidescreenHack;
 	int iAspectRatio;