Added option to DDraw blitter to force flipping

src/burner/win32/app.rc

@@ -975,6 +975,8 @@ BEGIN
                 MENUITEM SEPARATOR
                 MENUITEM "&Rotate scanlines",                           MENU_ROTSCAN
                 MENUITEM SEPARATOR
+				MENUITEM "Force &Flip",									MENU_FORCE_FLIP
+				MENUITEM SEPARATOR
                 POPUP "Buffering &method"
                 BEGIN
                         MENUITEM "&Autodetect",                         MENU_MEMAUTO

src/burner/win32/cona.cpp

@@ -126,6 +126,7 @@ int ConfigAppLoad()
 
 		// DirectDraw blitter
 		VAR(bVidScanHalf);
+		VAR(bVidForceFlip);
 
 		// Direct3D blitter
 		VAR(bVidBilinear);
@@ -384,6 +385,8 @@ int ConfigAppSave()
 	_ftprintf(h, _T("// --- DirectDraw blitter module settings -------------------------------------\n"));
 	_ftprintf(h, _T("\n// If non-zero, draw scanlines at 50%% intensity\n"));
 	VAR(bVidScanHalf);
+	_ftprintf(h, _T("\n// If non-zero, force flipping for games that need it\n"));
+	VAR(bVidForceFlip);
 	_ftprintf(h, _T("\n"));
 	_ftprintf(h, _T("// --- Direct3D 7 blitter module settings -------------------------------------\n"));
 	_ftprintf(h, _T("\n// If non-zero, use bi-linear filtering to display the image\n"));

src/burner/win32/menu.cpp

@@ -671,6 +671,7 @@ void MenuUpdate()
 			}
 			CheckMenuRadioItem(hMenu, MENU_NORMAL, MENU_SCAN50, var, MF_BYCOMMAND);
 			CheckMenuItem(hMenu, MENU_ROTSCAN, bVidScanRotate ? MF_CHECKED : MF_UNCHECKED);
+			CheckMenuItem(hMenu, MENU_FORCE_FLIP, bVidForceFlip ? MF_CHECKED : MF_UNCHECKED);
 			CheckMenuItem(hMenu, MENU_RES_ARCADE, bVidArcaderes ? MF_CHECKED : MF_UNCHECKED);
 			break;
 		case 1:

src/burner/win32/resource.h

@@ -560,6 +560,7 @@
 #define MENU_EFFECT_10						11147
 #define MENU_FORCE_16BIT					11141
 #define MENU_TEXTUREMANAGE					11142
+#define MENU_FORCE_FLIP						11143
 
 #define MENU_SOFT_STRETCH					11201
 #define MENU_SOFT_SCALE2X					11202

src/burner/win32/scrn.cpp

@@ -2045,6 +2045,11 @@ static void OnCommand(HWND /*hDlg*/, int id, HWND /*hwndCtl*/, UINT codeNotify)
 					bVidScanRotate = !bVidScanRotate;
 					POST_INITIALISE_MESSAGE;
 					break;
+					
+				case MENU_FORCE_FLIP:
+					bVidForceFlip = !bVidForceFlip;
+					POST_INITIALISE_MESSAGE;
+					break;
 			}
 			break;
 		}

src/interface/interface.h

@@ -193,6 +193,7 @@ extern INT32 nVidRotationAdjust;
 extern INT32 bVidUseHardwareGamma;
 extern INT32 bVidAutoSwitchFull;
 extern INT32 bVidForce16bit;
+extern INT32 bVidForceFlip;
 extern INT32 nVidTransferMethod;
 extern float fVidScreenAngle;
 extern float fVidScreenCurvature;

src/interface/vid_interface.cpp

@@ -69,6 +69,7 @@ INT32 bVidArcaderesVer = 0;
 
 INT32 nVidRotationAdjust = 0;						// & 1: do not rotate the graphics for vertical games,  & 2: Reverse flipping for vertical games
 INT32 bVidForce16bit = 1;							// Emulate the game in 16-bit even when the screen is 32-bit (D3D blitter)
+INT32 bVidForceFlip = 0;							// Force flipping (DDraw blitter, hardware detection seems to fail on all? graphics hardware)
 INT32 nVidTransferMethod = -1;					// How to transfer the game image to video memory and/or a texture --
 												//  0 = blit from system memory / use driver/DirectX texture management
 												//  1 = copy to a video memory surface, then use bltfast()

src/interface/win32/vid_ddraw.cpp

@@ -330,7 +330,7 @@ static int vidInit()
 			ddcaps.dwSize = sizeof(ddcaps);
 
 			DtoDD->GetCaps(&ddcaps, NULL);
-			if ((ddcaps.dwFXCaps & DDFXCAPS_BLTMIRRORLEFTRIGHT) && (ddcaps.dwFXCaps & DDFXCAPS_BLTMIRRORUPDOWN)) {
+			if (((ddcaps.dwFXCaps & DDFXCAPS_BLTMIRRORLEFTRIGHT) && (ddcaps.dwFXCaps & DDFXCAPS_BLTMIRRORUPDOWN)) || bVidForceFlip) {
 
 				DtoBltFx = (DDBLTFX*)malloc(sizeof(DDBLTFX));
 				if (DtoBltFx == NULL) {

whatsnew.html

@@ -112,6 +112,7 @@
 <li>Updated M6502 CPU core interface to allocate memory rather than use an array [iq_132]</li>
 <li>Updated Vez CPU core interface to allocate memory rather than use an array, and added support for auto-acknowledging IRQs [iq_132]</li>
 <li>Fixed crash when taking screenshots of vertical or flipped games using blitters other than the D3D enhanced blitter [Barry]</li>
+<li>Added option to DirectDraw blitter to force flipping as it isn't usually detected as available, see help file for more information [Barry]</li>
 <li>Matched all sets to MAME 0.144u2 [Barry]</li>
 <li>Matched the Megadrive sets to MESS 0.144u2 [Barry]</li>
 </ul>