Better switch full screen fix

zsnes/src/linux/sdlintrf.asm

@@ -121,6 +121,7 @@ EXTSYM WinErrorA2,WinErrorB2,WinErrorC2
 EXTSYM ZsnesPage
 EXTSYM GetLocalTime
 EXTSYM V8Mode,GrayscaleMode
+EXTSYM PrevWinMode
 
 NEWSYM WinIntRFAsmStart
 
@@ -816,6 +817,13 @@ NEWSYM initvideo  ; Returns 1 in videotroub if trouble occurs
    call initwinvideo
    popad
 
+   xor eax,eax
+   mov al,[cvidmode]
+   cmp byte[GUIWFVID+eax],1
+   je .noprevwinmode
+   mov byte[PrevWinMode],al
+.noprevwinmode
+
    cmp dword[firstvideo],1
    je .skipinitgfx
    pushad

zsnes/src/win/winintrf.asm

@@ -133,6 +133,7 @@ EXTSYM UDPDisableMode,UDPEnableMode,UDPClearVars,UDPWait1Sec
 EXTSYM WinErrorA2,WinErrorB2,WinErrorC2
 EXTSYM ZsnesPage
 EXTSYM V8Mode,GrayscaleMode
+EXTSYM PrevWinMode
 EXTSYM _imp__GetLocalTime@4
 
 
@@ -1094,6 +1095,13 @@ NEWSYM initvideo  ; Returns 1 in videotroub if trouble occurs
    call initwinvideo
    popad
 
+   xor eax,eax
+   mov al,[cvidmode]
+   cmp byte[GUIWFVID+eax],1
+   je .noprevwinmode
+   mov byte[PrevWinMode],al
+.noprevwinmode
+
    cmp dword[firstvideo],1
    je .skipinitgfx
    pushad

zsnes/src/win/winlink.cpp

@@ -1491,7 +1491,6 @@ extern unsigned char cvidmode;
 DWORD FirstVid=1;
 DWORD FirstFull=1;
 extern BYTE GUIWFVID[];
-extern BYTE PrevWinMode;
 void clearwin();
 
 char WinName[]={"ZSNESW\0"};
@@ -1512,7 +1511,6 @@ void initwinvideo(void)
       X=0;
       Y=0;
       FullScreen=GUIWFVID[cvidmode];
-      if (GUIWFVID[cvidmode] == 0) PrevWinMode = cvidmode;
 
       switch (cvidmode)
       {