Fixed garbled screen after VSync or Trible Buffering is enabled.

zsnes/src/gui/guikeys.inc

@@ -768,8 +768,7 @@ GUIOptionKeys:
 .nousepl34
 %ifdef __MSDOS__
     GUIKeyCheckbox SidewinderFix,'I'
-%endif
-%ifdef __WIN32__
+%elifdef __WIN32__
     GUIKeyCheckbox HighPriority,'H'
 %endif
     GUIKeyCheckbox FPSAtStart,'F'
@@ -1147,9 +1146,11 @@ GUIVideoKeys:
 ;    mov byte[vsyncon],0
 ;    mov byte[cfgvsync],0
     call initDirectDraw
+    pushad
+    call Clear2xSaIBuffer
+    popad
 .notriplebufferwin
-%endif
-%ifdef __MSDOS__
+%elifdef __MSDOS__
     cmp dh,'T'
     jne .notriplebuffer
     xor ebx,ebx
@@ -1173,6 +1174,9 @@ GUIVideoKeys:
     mov [cfgvsync],al
 %ifdef __WIN32__
     call initDirectDraw
+    pushad
+    call Clear2xSaIBuffer
+    popad
 %endif
 %ifdef __MSDOS__
 ;    mov byte[Triplebufen],0

zsnes/src/gui/guimouse.inc

@@ -2400,8 +2400,10 @@ DisplayGUIVideoClick:
     GUIClickCButton 11,183,byte[GrayscaleMode]
 %ifdef __WIN32__
     GUIClickCButtonf 115,183,byte[vsyncon],initDirectDraw
-%endif
-%ifdef __MSDOS__
+    pushad
+    call Clear2xSaIBuffer
+    popad
+%elifdef __MSDOS__
     GUIClickCButtonT 115,183,byte[vsyncon],byte[Triplebufen]
 %endif
     xor ebx,ebx
@@ -2428,6 +2430,9 @@ DisplayGUIVideoClick:
     cmp byte[GUITBWVID+ebx],0
     je near .notriplebufferwin
     GUIClickCButtonf 11,123,byte[TripleBufferWin],initDirectDraw
+    pushad
+    call Clear2xSaIBuffer
+    popad
 .notriplebufferwin
 %endif
     xor ebx,ebx
@@ -2518,8 +2523,7 @@ DisplayGUISoundClick:
     GUIClickCButton5 111,173,byte[LowPassFilterType],2
 %ifndef __MSDOS__
     GUIClickCButton5MMXC 111,183,byte[LowPassFilterType],3
-%endif
-%ifdef __WIN32__
+%elifdef __WIN32__
     GUIClickCButton 11,101,byte[PrimaryBuffer]
 %endif
     cmp eax,15