mirror of
https://github.com/libretro/snes9x2005.git
synced 2024-11-27 10:30:32 +00:00
129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
#include "../copyright"
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#ifndef _CPUEXEC_H_
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#define _CPUEXEC_H_
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typedef struct
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{
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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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} SOpcodes;
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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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#include <retro_inline.h>
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#define DO_HBLANK_CHECK_SFX() \
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if (CPU.Cycles >= CPU.NextEvent) \
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S9xDoHBlankProcessing_SFX ();
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#define DO_HBLANK_CHECK_NoSFX() \
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if (CPU.Cycles >= CPU.NextEvent) \
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S9xDoHBlankProcessing_NoSFX ();
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typedef struct
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{
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uint8_t* UNUSED1;
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SOpcodes* S9xOpcodes;
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SRegisters Registers;
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uint8_t _Carry;
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uint8_t _Zero;
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uint8_t _Negative;
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uint8_t _Overflow;
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bool CPUExecuting;
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uint32_t ShiftedPB;
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uint32_t ShiftedDB;
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uint32_t Frame;
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uint32_t UNUSED2;
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uint32_t UNUSED3;
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} SICPU;
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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 S9xDoHBlankProcessing_SFX(void);
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void S9xDoHBlankProcessing_NoSFX(void);
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void S9xClearIRQ(uint32_t source);
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void S9xSetIRQ(uint32_t source);
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extern SOpcodes S9xOpcodesE1 [256];
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extern SOpcodes S9xOpcodesM1X1 [256];
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extern SOpcodes S9xOpcodesM1X0 [256];
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extern SOpcodes S9xOpcodesM0X1 [256];
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extern SOpcodes S9xOpcodesM0X0 [256];
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extern SICPU ICPU;
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static INLINE void S9xUnpackStatus(void)
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{
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ICPU._Zero = (ICPU.Registers.PL & Zero) == 0;
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ICPU._Negative = (ICPU.Registers.PL & Negative);
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ICPU._Carry = (ICPU.Registers.PL & Carry);
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ICPU._Overflow = (ICPU.Registers.PL & Overflow) >> 6;
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}
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static INLINE void S9xPackStatus(void)
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{
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ICPU.Registers.PL &= ~(Zero | Negative | Carry | Overflow);
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ICPU.Registers.PL |= ICPU._Carry | ((ICPU._Zero == 0) << 1) | (ICPU._Negative & 0x80) | (ICPU._Overflow << 6);
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}
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static INLINE void CLEAR_IRQ_SOURCE(uint32_t 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(void)
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{
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if (CheckEmulation())
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ICPU.S9xOpcodes = S9xOpcodesE1;
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else if (CheckMemory())
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{
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if (CheckIndex())
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ICPU.S9xOpcodes = S9xOpcodesM1X1;
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else
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ICPU.S9xOpcodes = S9xOpcodesM1X0;
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}
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else
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{
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if (CheckIndex())
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ICPU.S9xOpcodes = S9xOpcodesM0X1;
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else
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ICPU.S9xOpcodes = S9xOpcodesM0X0;
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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_t which;
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int32_t max;
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if (CPU.WhichEvent == HBLANK_START_EVENT || CPU.WhichEvent == HTIMER_AFTER_EVENT)
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{
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which = HBLANK_END_EVENT;
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max = Settings.H_Max;
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}
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else
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{
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which = HBLANK_START_EVENT;
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max = Settings.HBlankStart;
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}
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if (PPU.HTimerEnabled &&
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(int32_t) PPU.HTimerPosition < max && (int32_t) PPU.HTimerPosition > CPU.NextEvent &&
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(!PPU.VTimerEnabled || (PPU.VTimerEnabled && CPU.V_Counter == PPU.IRQVBeamPos)))
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{
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which = (int32_t) PPU.HTimerPosition < Settings.HBlankStart ? HTIMER_BEFORE_EVENT : HTIMER_AFTER_EVENT;
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max = PPU.HTimerPosition;
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}
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CPU.NextEvent = max;
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CPU.WhichEvent = which;
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}
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#endif
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