win32: Add a reduce input lag option for OpenGL and Direct3D.

win32/CDirect3D.cpp

@@ -731,6 +731,20 @@ void CDirect3D::Render(SSurface Src)
 
 	pDevice->Present(NULL, NULL, NULL, NULL);
 
+	if (GUI.ReduceInputLag)
+	{
+		IDirect3DSurface9 *surface;
+
+		if (pDevice->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &surface) == D3D_OK)
+		{
+			if (surface->LockRect(&lr, NULL, D3DLOCK_READONLY) == D3D_OK)
+			{
+				surface->UnlockRect();
+			}
+			surface->Release();
+		}
+	}
+
     return;
 }
 
@@ -927,6 +941,7 @@ bool CDirect3D::ResetDevice()
 	dPresentParams.FullScreen_RefreshRateInHz = 0;
 	dPresentParams.Windowed = true;
 	dPresentParams.PresentationInterval = GUI.Vsync?D3DPRESENT_INTERVAL_ONE:D3DPRESENT_INTERVAL_IMMEDIATE;
+	dPresentParams.Flags = D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
 
 	if(fullscreen) {
 		dPresentParams.BackBufferWidth = GUI.FullscreenMode.width;

win32/COpenGL.cpp

@@ -521,6 +521,8 @@ void COpenGL::Render(SSurface Src)
 
 	glFlush();
 	SwapBuffers(hDC);
+	if (GUI.ReduceInputLag)
+		glFinish();
 }
 
 bool COpenGL::ChangeRenderSize(unsigned int newWidth, unsigned int newHeight)

win32/rsrc/resource.h

@@ -329,6 +329,7 @@
 #define IDC_LABEL_HK12                  1255
 #define IDC_LABEL_HK13                  1256
 #define IDC_PLAYWARN                    1257
+#define IDC_REDUCEINPUTLAG              1258
 #define IDC_HOTKEY1                     2000
 #define IDC_HOTKEY2                     2001
 #define IDC_HOTKEY3                     2002

win32/rsrc/snes9x.rc

@@ -231,7 +231,7 @@ BEGIN
     GROUPBOX        "Output Image Processing",IDC_STATIC,179,7,166,46,0,WS_EX_TRANSPARENT
     GROUPBOX        "Fullscreen Display Settings",IDC_STATIC,179,56,166,44,0,WS_EX_TRANSPARENT
     LTEXT           "Hi Res:",IDC_HIRESLABEL,186,36,31,8
-    GROUPBOX        "General",IDC_STATIC,7,7,167,113,0,WS_EX_TRANSPARENT
+    GROUPBOX        "General",IDC_STATIC,7,7,167,118,0,WS_EX_TRANSPARENT
     LTEXT           "Max skipped frames:",IDC_STATIC,62,140,67,8
     LTEXT           "Amount skipped:",IDC_STATIC,62,158,67,8
     LTEXT           "Output Method",IDC_STATIC,10,19,51,11
@@ -242,6 +242,7 @@ BEGIN
     LTEXT           "OpenGL Shader File",IDC_STATIC,13,224,104,8
     CONTROL         "Blend Hi-Res Images",IDC_HIRESBLEND,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,187,135,82,10
     CONTROL         "VSync",IDC_VSYNC,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,11,102,37,10
+	CONTROL         "Reduce Input Lag", IDC_REDUCEINPUTLAG, "Button", BS_AUTOCHECKBOX | WS_TABSTOP, 11, 113, 76, 10
     CONTROL         "Scale messages with EPX if possible",IDC_MESSAGES_SCALE,
                     "Button",BS_AUTOCHECKBOX | WS_TABSTOP,187,168,131,10
 END

win32/wconfig.cpp

@@ -926,6 +926,7 @@ void WinRegisterConfigItems()
 	AddBoolC("Fullscreen:EmulateFullscreen", GUI.EmulateFullscreen, true,"true makes snes9x create a window that spans the entire screen when going fullscreen");
 	AddBoolC("HideMenu", GUI.HideMenu, false, "true to auto-hide the menu bar on startup.");
 	AddBoolC("Vsync", GUI.Vsync, false, "true to enable Vsync");
+	AddBoolC("ReduceInputLag", GUI.ReduceInputLag, false, "true to reduce input lag by hard synchronization");
 	AddBoolC("FilterMessageFont", GUI.filterMessagFont, true, "true to filter message font with EPX on 2x/3x scales if MessagesInImage is false)");
 #undef CATEGORY
 #define CATEGORY "Settings"

win32/wsnes9x.cpp

@@ -7375,6 +7375,8 @@ INT_PTR CALLBACK DlgFunky(HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam)
             SendDlgItemMessage(hDlg, IDC_DBLBUFFER, BM_SETCHECK, (WPARAM)BST_CHECKED, 0);
         if (GUI.Vsync)
             SendDlgItemMessage(hDlg, IDC_VSYNC, BM_SETCHECK, (WPARAM)BST_CHECKED, 0);
+		if (GUI.ReduceInputLag)
+			SendDlgItemMessage(hDlg, IDC_REDUCEINPUTLAG, BM_SETCHECK, (WPARAM)BST_CHECKED, 0);
         SendDlgItemMessage(hDlg, IDC_FRAMERATESKIPSLIDER, TBM_SETRANGE, (WPARAM)true, (LPARAM)MAKELONG(0, 9));
         if (Settings.SkipFrames != AUTO_FRAMERATE)
             SendDlgItemMessage(hDlg, IDC_FRAMERATESKIPSLIDER, TBM_SETPOS, (WPARAM)true, (LPARAM)Settings.SkipFrames);
@@ -7773,6 +7775,7 @@ updateFilterBox2:
 			Settings.AutoDisplayMessages = IsDlgButtonChecked(hDlg, IDC_MESSAGES_IN_IMAGE);
 			GUI.filterMessagFont = IsDlgButtonChecked(hDlg, IDC_MESSAGES_SCALE);
 			GUI.DoubleBuffered = (bool)(IsDlgButtonChecked(hDlg, IDC_DBLBUFFER)==BST_CHECKED);
+			GUI.ReduceInputLag = (bool)(IsDlgButtonChecked(hDlg, IDC_REDUCEINPUTLAG) == BST_CHECKED);
 			GUI.Vsync = (bool)(IsDlgButtonChecked(hDlg, IDC_VSYNC
 
 				)==BST_CHECKED);

win32/wsnes9x.h

@@ -333,7 +333,8 @@ struct sGUI {
 	bool EmulatedFullscreen;
 	bool BilinearFilter;
 	bool LocalVidMem;
-	bool Vsync;	
+	bool Vsync;
+	bool ReduceInputLag;
 	bool shaderEnabled;
 	TCHAR D3DshaderFileName[MAX_PATH];
 	TCHAR OGLshaderFileName[MAX_PATH];