As requested apply the same changes made by rev 6958822 to the D3D9 b…

…ackend.

handle v-sync changed while the emulation is running.
thanks to neobrain for pointing the missing functionality.

Source/Plugins/Plugin_VideoDX9/Src/Render.cpp

@@ -68,7 +68,7 @@ static u32 s_blendMode;
 static u32 s_LastAA;
 static bool IS_AMD;
 static float m_fMaxPointSize;
-
+static bool s_vsync;
 static char *st;
 
 static LPDIRECT3DSURFACE9 ScreenShootMEMSurface = NULL;
@@ -190,7 +190,8 @@ Renderer::Renderer()
 	D3D::dev->CreateOffscreenPlainSurface(s_backbuffer_width,s_backbuffer_height, D3DFMT_X8R8G8B8, D3DPOOL_SYSTEMMEM, &ScreenShootMEMSurface, NULL );
 	D3D::SetRenderState(D3DRS_POINTSCALEENABLE,false);
 	m_fMaxPointSize = D3D::GetCaps().MaxPointSize;
-
+	// Handle VSync on/off 
+	s_vsync = g_ActiveConfig.IsVSync();
 }
 
 Renderer::~Renderer()
@@ -452,7 +453,8 @@ u32 Renderer::AccessEFB(EFBAccessType type, u32 x, u32 y, u32 poke_data)
 	}
 	else if(type == PEEK_COLOR)
 	{
-		// TODO: Can't we directly StretchRect to System buf?
+		// We can't directly StretchRect to System buf because is not suported by all implementations
+		// this is the only safe path that works in most cases
 		hr = D3D::dev->StretchRect(pEFBSurf, &RectToLock, pBufferRT, NULL, D3DTEXF_NONE);
 		D3D::dev->GetRenderTargetData(pBufferRT, pSystemBuf);
 
@@ -1037,7 +1039,8 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 
 	DLCache::ProgressiveCleanup();
 	TextureCache::Cleanup();
-
+	// Flip/present backbuffer to frontbuffer here
+	D3D::Present();
 	// Enable configuration changes
 	UpdateActiveConfig();
 	TextureCache::OnConfigChanged(g_ActiveConfig);
@@ -1096,8 +1099,15 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 	// New frame
 	stats.ResetFrame();
 
-	// Flip/present backbuffer to frontbuffer here
-	D3D::Present();
+	// Handle vsync changes during execution
+	if(s_vsync != g_ActiveConfig.IsVSync())
+	{
+		s_vsync = g_ActiveConfig.IsVSync();
+		TeardownDeviceObjects();
+		D3D::Reset();
+		// device objects lost, so recreate all of them
+		SetupDeviceObjects();
+	}
 	D3D::BeginFrame();
 	RestoreAPIState();
 
@@ -1113,14 +1123,16 @@ void Renderer::ApplyState(bool bUseDstAlpha)
 {
 	if (bUseDstAlpha)
 	{
-		// TODO: WTF is this crap? We're enabling color writing regardless of the actual GPU state here...
+		// If we get here we are sure that we are using dst alpha pass. (bpmem.dstalpha.enable)
+		// Alpha write is enabled. (because bpmem.blendmode.alphaupdate && bpmem.zcontrol.pixel_format == PIXELFMT_RGBA6_Z24)
+		// We must disable blend because we want to write alpha value directly to the alpha channel without modifications.
 		D3D::ChangeRenderState(D3DRS_COLORWRITEENABLE, D3DCOLORWRITEENABLE_ALPHA);
 		D3D::ChangeRenderState(D3DRS_ALPHABLENDENABLE, false);
 		if(bpmem.zmode.testenable && bpmem.zmode.updateenable)
 		{
-			//This is needed to draw to the correct pixels in multi-pass algorithms
-			//this avoid z-figthing and grants that you write to the same pixels
-			//affected by the last pass
+			// This is needed to draw to the correct pixels in multi-pass algorithms
+			// to avoid z-figthing and grants that you write to the same pixels
+			// affected by the last pass
 			D3D::ChangeRenderState(D3DRS_ZWRITEENABLE, false);
 			D3D::ChangeRenderState(D3DRS_ZFUNC, D3DCMP_EQUAL);
 		}