mirror of
https://github.com/dborth/snes9xgx.git
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342 lines
9.1 KiB
C
342 lines
9.1 KiB
C
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/**********************************************************************************
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
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Jerremy Koot (jkoot@snes9x.com)
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(c) Copyright 2002 - 2004 Matthew Kendora
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(c) Copyright 2002 - 2005 Peter Bortas (peter@bortas.org)
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(c) Copyright 2004 - 2005 Joel Yliluoma (http://iki.fi/bisqwit/)
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(c) Copyright 2001 - 2006 John Weidman (jweidman@slip.net)
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(c) Copyright 2002 - 2006 Brad Jorsch (anomie@users.sourceforge.net),
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funkyass (funkyass@spam.shaw.ca),
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Kris Bleakley (codeviolation@hotmail.com),
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Nach (n-a-c-h@users.sourceforge.net), and
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zones (kasumitokoduck@yahoo.com)
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BS-X C emulator code
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(c) Copyright 2005 - 2006 Dreamer Nom,
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zones
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C4 x86 assembler and some C emulation code
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(c) Copyright 2000 - 2003 _Demo_ (_demo_@zsnes.com),
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Nach,
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zsKnight (zsknight@zsnes.com)
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C4 C++ code
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(c) Copyright 2003 - 2006 Brad Jorsch,
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Nach
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DSP-1 emulator code
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(c) Copyright 1998 - 2006 _Demo_,
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Andreas Naive (andreasnaive@gmail.com)
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Gary Henderson,
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Ivar (ivar@snes9x.com),
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John Weidman,
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Kris Bleakley,
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Matthew Kendora,
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Nach,
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neviksti (neviksti@hotmail.com)
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DSP-2 emulator code
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(c) Copyright 2003 John Weidman,
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Kris Bleakley,
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Lord Nightmare (lord_nightmare@users.sourceforge.net),
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Matthew Kendora,
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neviksti
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DSP-3 emulator code
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(c) Copyright 2003 - 2006 John Weidman,
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Kris Bleakley,
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Lancer,
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z80 gaiden
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DSP-4 emulator code
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(c) Copyright 2004 - 2006 Dreamer Nom,
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John Weidman,
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Kris Bleakley,
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Nach,
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z80 gaiden
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OBC1 emulator code
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(c) Copyright 2001 - 2004 zsKnight,
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pagefault (pagefault@zsnes.com),
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Kris Bleakley,
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Ported from x86 assembler to C by sanmaiwashi
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SPC7110 and RTC C++ emulator code
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(c) Copyright 2002 Matthew Kendora with research by
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zsKnight,
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John Weidman,
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Dark Force
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S-DD1 C emulator code
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(c) Copyright 2003 Brad Jorsch with research by
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Andreas Naive,
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John Weidman
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S-RTC C emulator code
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(c) Copyright 2001-2006 byuu,
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John Weidman
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ST010 C++ emulator code
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(c) Copyright 2003 Feather,
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John Weidman,
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Kris Bleakley,
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Matthew Kendora
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Super FX x86 assembler emulator code
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(c) Copyright 1998 - 2003 _Demo_,
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pagefault,
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zsKnight,
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Super FX C emulator code
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(c) Copyright 1997 - 1999 Ivar,
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Gary Henderson,
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John Weidman
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Sound DSP emulator code is derived from SNEeSe and OpenSPC:
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(c) Copyright 1998 - 2003 Brad Martin
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(c) Copyright 1998 - 2006 Charles Bilyue'
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SH assembler code partly based on x86 assembler code
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(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
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2xSaI filter
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(c) Copyright 1999 - 2001 Derek Liauw Kie Fa
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HQ2x filter
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(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
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Specific ports contains the works of other authors. See headers in
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individual files.
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Snes9x homepage: http://www.snes9x.com
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Permission to use, copy, modify and/or distribute Snes9x in both binary
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and source form, for non-commercial purposes, is hereby granted without
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fee, providing that this license information and copyright notice appear
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with all copies and any derived work.
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This software is provided 'as-is', without any express or implied
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warranty. In no event shall the authors be held liable for any damages
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arising from the use of this software or it's derivatives.
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Snes9x is freeware for PERSONAL USE only. Commercial users should
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seek permission of the copyright holders first. Commercial use includes,
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but is not limited to, charging money for Snes9x or software derived from
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Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
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using Snes9x as a promotion for your commercial product.
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The copyright holders request that bug fixes and improvements to the code
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should be forwarded to them so everyone can benefit from the modifications
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in future versions.
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Super NES and Super Nintendo Entertainment System are trademarks of
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Nintendo Co., Limited and its subsidiary companies.
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**********************************************************************************/
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#ifndef _CPUEXEC_H_
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#define _CPUEXEC_H_
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#include "snes9x.h"
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struct SOpcodes {
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#ifdef __WIN32__
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void (__cdecl *S9xOpcode)( void);
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#else
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void (*S9xOpcode)( void);
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#endif
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};
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struct SICPU
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{
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uint8 *Speed;
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struct SOpcodes *S9xOpcodes;
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uint8 *S9xOpLengths;
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uint8 _Carry;
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uint8 _Zero;
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uint8 _Negative;
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uint8 _Overflow;
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bool8 CPUExecuting;
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uint32 ShiftedPB;
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uint32 ShiftedDB;
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uint32 Frame;
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uint32 Scanline;
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uint32 FrameAdvanceCount;
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};
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START_EXTERN_C
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extern struct SICPU ICPU;
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END_EXTERN_C
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#include "ppu.h"
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#include "memmap.h"
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#include "65c816.h"
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START_EXTERN_C
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void S9xMainLoop (void);
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void S9xReset (void);
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void S9xSoftReset (void);
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void S9xDoHEventProcessing ();
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void S9xClearIRQ (uint32);
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void S9xSetIRQ (uint32);
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extern struct SOpcodes S9xOpcodesE1 [256];
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extern struct SOpcodes S9xOpcodesM1X1 [256];
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extern struct SOpcodes S9xOpcodesM1X0 [256];
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extern struct SOpcodes S9xOpcodesM0X1 [256];
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extern struct SOpcodes S9xOpcodesM0X0 [256];
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extern struct SOpcodes S9xOpcodesSlow [256];
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extern uint8 S9xOpLengthsM1X1 [256];
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extern uint8 S9xOpLengthsM1X0 [256];
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extern uint8 S9xOpLengthsM0X1 [256];
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extern uint8 S9xOpLengthsM0X0 [256];
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END_EXTERN_C
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STATIC inline void S9xUnpackStatus()
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{
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ICPU._Zero = (Registers.PL & Zero) == 0;
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ICPU._Negative = (Registers.PL & Negative);
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ICPU._Carry = (Registers.PL & Carry);
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ICPU._Overflow = (Registers.PL & Overflow) >> 6;
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}
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STATIC inline void S9xPackStatus()
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{
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Registers.PL &= ~(Zero | Negative | Carry | Overflow);
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Registers.PL |= ICPU._Carry | ((ICPU._Zero == 0) << 1) |
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(ICPU._Negative & 0x80) | (ICPU._Overflow << 6);
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}
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STATIC inline void CLEAR_IRQ_SOURCE (uint32 M)
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{
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CPU.IRQActive &= ~M;
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if (!CPU.IRQActive)
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CPU.Flags &= ~IRQ_PENDING_FLAG;
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}
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STATIC inline void S9xFixCycles ()
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{
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if (CheckEmulation ())
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{
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ICPU.S9xOpcodes = S9xOpcodesE1;
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ICPU.S9xOpLengths = S9xOpLengthsM1X1;
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}
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else
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if (CheckMemory ())
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{
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if (CheckIndex ())
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{
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ICPU.S9xOpcodes = S9xOpcodesM1X1;
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ICPU.S9xOpLengths = S9xOpLengthsM1X1;
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}
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else
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{
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ICPU.S9xOpcodes = S9xOpcodesM1X0;
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ICPU.S9xOpLengths = S9xOpLengthsM1X0;
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}
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}
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else
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{
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if (CheckIndex ())
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{
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ICPU.S9xOpcodes = S9xOpcodesM0X1;
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ICPU.S9xOpLengths = S9xOpLengthsM0X1;
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}
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else
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{
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ICPU.S9xOpcodes = S9xOpcodesM0X0;
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ICPU.S9xOpLengths = S9xOpLengthsM0X0;
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}
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}
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}
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STATIC inline void S9xReschedule (void)
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{
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uint8 next = 0;
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int32 hpos = 0;
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switch (CPU.WhichEvent)
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{
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case HC_HBLANK_START_EVENT:
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case HC_IRQ_1_3_EVENT:
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next = HC_HDMA_START_EVENT;
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hpos = Timings.HDMAStart;
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break;
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case HC_HDMA_START_EVENT:
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case HC_IRQ_3_5_EVENT:
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next = HC_HCOUNTER_MAX_EVENT;
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hpos = Timings.H_Max;
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break;
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case HC_HCOUNTER_MAX_EVENT:
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case HC_IRQ_5_7_EVENT:
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next = HC_HDMA_INIT_EVENT;
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hpos = Timings.HDMAInit;
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break;
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case HC_HDMA_INIT_EVENT:
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case HC_IRQ_7_9_EVENT:
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next = HC_RENDER_EVENT;
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hpos = Timings.RenderPos;
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break;
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case HC_RENDER_EVENT:
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case HC_IRQ_9_A_EVENT:
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next = HC_WRAM_REFRESH_EVENT;
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hpos = Timings.WRAMRefreshPos;
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break;
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case HC_WRAM_REFRESH_EVENT:
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case HC_IRQ_A_1_EVENT:
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next = HC_HBLANK_START_EVENT;
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hpos = Timings.HBlankStart;
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break;
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}
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if (((int32) PPU.HTimerPosition > CPU.NextEvent) && ((int32) PPU.HTimerPosition < hpos))
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{
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hpos = (int32) PPU.HTimerPosition;
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switch (next)
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{
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case HC_HDMA_START_EVENT:
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next = HC_IRQ_1_3_EVENT;
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break;
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case HC_HCOUNTER_MAX_EVENT:
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next = HC_IRQ_3_5_EVENT;
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break;
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case HC_HDMA_INIT_EVENT:
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next = HC_IRQ_5_7_EVENT;
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break;
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case HC_RENDER_EVENT:
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next = HC_IRQ_7_9_EVENT;
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break;
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case HC_WRAM_REFRESH_EVENT:
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next = HC_IRQ_9_A_EVENT;
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break;
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case HC_HBLANK_START_EVENT:
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next = HC_IRQ_A_1_EVENT;
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break;
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}
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}
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CPU.NextEvent = hpos;
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CPU.WhichEvent = next;
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}
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#endif
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