Added a quick key to swap players 1/2 with 3/4

zsnes/src/vcache.asm

@@ -33,7 +33,7 @@ EXTSYM KeyBGDisble0,KeyBGDisble1,KeyBGDisble2,KeyBGDisble3,KeySprDisble
 EXTSYM KeyResetAll,KeyExtraEnab,KeyWinDisble,KeyNewGfxSwt,KeyOffsetMSw
 EXTSYM KeyStateSlc0,KeyStateSlc1,KeyStateSlc2,KeyStateSlc3,KeyStateSlc4
 EXTSYM KeyStateSlc5,KeyStateSlc6,KeyStateSlc7,KeyStateSlc8,KeyStateSlc9
-EXTSYM KeyIncStateSlot,KeyDecStateSlot
+EXTSYM KeyIncStateSlot,KeyDecStateSlot,KeySwapPlayer1234
 EXTSYM maxskip,DSPMem,SprValAdd,dsp1ptr,dsp1array,FastFwdToggle,SaveSramData
 EXTSYM ngextbg,Mode7HiRes,Check60hz,Get_MouseData,Get_MousePositionDisplacement
 EXTSYM WindowDisables,scanlines,romispal
@@ -45,7 +45,7 @@ EXTSYM CNetType
 EXTSYM KeySlowDown
 EXTSYM chaton
 EXTSYM genfulladdtab
-EXTSYM KeyFRateDown,KeyFRateUp,KeyVolUp,KeyVolDown,KeyDisplayFPS,FPSOn
+EXTSYM KeyFRateDown,KeyFRateUp,KeyVolUp,KeyVolDown,KeyDisplayFPS,FPSOn,pl12s34
 EXTSYM bg1ptr,bg2ptr,bg3ptr,bg4ptr,cachebg1,resolutn
 EXTSYM curypos,oamram,objhipr,objptr,objptrn,objsize1,objsize2
 EXTSYM spritetablea,sprleftpr,sprlefttot,vcache4b
@@ -792,6 +792,19 @@ NEWSYM cachevideo
     mov [MessageOn],eax
     xor dh,dh
 .nodecstateslot
+    mov eax,[KeySwapPlayer1234]
+    test byte[pressed+eax],1
+    je .noswpl1234
+    mov byte[pressed+eax],2
+    xor byte[pl12s34],1
+    mov dword[Msgptr],plsw1234en
+    cmp byte[pl12s34],1
+    je .swpl1234
+    mov dword[Msgptr],plsw1234dis
+.swpl1234
+    mov eax,[MsgCount]
+    mov [MessageOn],eax
+.noswpl1234
 
     ; do sound disables
     soundselcomp KeyDisableSC0,Voice0Disable,Voice0Status,'1'
@@ -981,6 +994,8 @@ NEWSYM sselm, db 'STATE SLOT 0 SELECTED',0
 NEWSYM vollv, db 'VOLUME LEVEL :    ',0
 NEWSYM frlev, db 'FRAME SKIP SET TO  ',0
 NEWSYM frlv0, db 'AUTO FRAMERATE ENABLED',0
+NEWSYM plsw1234en, db 'SWAPPED PLAYER 1/2 with 3/4',0
+NEWSYM plsw1234dis, db 'SWAPPED PLAYER 3/4 with 1/2',0
 sndchena db 'SOUND CH   ENABLED',0
 sndchdis db 'SOUND CH   DISABLED',0
 bg1layena db 'BG1 LAYER ENABLED',0