First release of ZSNES sources

zsnes/src/cpu/regs.mac

@@ -0,0 +1,101 @@
+;Copyright (C) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )
+;
+;This program is free software; you can redistribute it and/or
+;modify it under the terms of the GNU General Public License
+;as published by the Free Software Foundation; either
+;version 2 of the License, or (at your option) any later
+;version.
+;
+;This program is distributed in the hope that it will be useful,
+;but WITHOUT ANY WARRANTY; without even the implied warranty of
+;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;GNU General Public License for more details.
+;
+;You should have received a copy of the GNU General Public License
+;along with this program; if not, write to the Free Software
+;Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+
+
+
+
+
+
+;*******************************************************
+; 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
+