snes9x/i386/regs.mac

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2010-09-25 15:46:12 +00:00
; Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
;
; Super FX assembler emulator code
; (c) Copyright 1998, 1999 zsKnight and _Demo_.
;
; Permission to use, copy, modify and distribute Snes9x in both binary and
; source form, for non-commercial purposes, is hereby granted without fee,
; providing that this license information and copyright notice appear with
; all copies and any derived work.
;
; This software is provided 'as-is', without any express or implied
; warranty. In no event shall the authors be held liable for any damages
; arising from the use of this software.
;
; Snes9x is freeware for PERSONAL USE only. Commercial users should
; seek permission of the copyright holders first. Commercial use includes
; charging money for Snes9x or software derived from Snes9x.
;
; The copyright holders request that bug fixes and improvements to the code
; should be forwarded to them so everyone can benefit from the modifications
; in future versions.
;
; Super NES and Super Nintendo Entertainment System are trademarks of
; Nintendo Co., Limited and its subsidiary companies.
;
;*******************************************************
; InitReg Initializes Registers
;*******************************************************
%macro setreg 2
mov edi,%1
add edi,[regptr]
mov eax,%2
mov [edi],eax
%endmacro
;*******************************************************
; Registers Note : Remember to restore AH, ECX, & DX
;*******************************************************
%macro checkmultchange 0
; execute multiplication
cmp byte[multchange],0
je .nomult
push edx
push eax
xor bh,bh
mov bl,[mode7B+1]
mov ax,[mode7A]
test bl,80h
jz .noneg
mov bh,0FFh
.noneg
imul bx
mov [compmult],ax
mov [compmult+2],dl
pop eax
pop edx
mov byte[multchange],0
.nomult
%endmacro
%macro mouse4016doxA 2
cmp byte[JoyAPos],%1
jne .nx7
mov bx,[mousexpos]
shr bx,%2
and bx,1
mov al,bl
.nx7
%endmacro
%macro mouse4016doyA 2
cmp byte[JoyAPos],%1
jne .ny7
mov bx,[mouseypos]
shr bx,%2
and bx,1
mov al,bl
.ny7
%endmacro
%macro mouse4017dox 2
cmp byte[JoyBPos],%1
jne .nx7
mov bx,[mousexpos]
shr bx,%2
and bx,1
mov al,bl
.nx7
%endmacro
%macro mouse4017doy 2
cmp byte[JoyBPos],%1
jne .ny7
mov bx,[mouseypos]
shr bx,%2
and bx,1
mov al,bl
.ny7
%endmacro