void Apu0D()
{
// PUSH PSW
S9xAPUPackStatus();
Push(IAPU.Registers.P);
IAPU.PC++;
}
void Apu0F()
{
// BRK
SPC700_PushW(IAPU.PC + 1 - IAPU.RAM);
S9xAPUPackStatus();
Push(IAPU.Registers.P);
APUSetBreak();
APUClearInterrupt();
// XXX:Where is the BRK vector ???
IAPU.PC = IAPU.RAM + APU.ExtraRAM[0x20] + (APU.ExtraRAM[0x21] << 8);
}
static void SPCPlayExec(void)
{
for (int v = 0; v < Timings.V_Max; v++)
{
S9xAPUExecute();
APU.Cycles -= (Timings.H_Max << SNES_APU_ACCURACY);
IAPU.NextAPUTimerPos -= (Timings.H_Max << SNES_APU_ACCURACY);
}
APURegisters.PC = IAPU.PC - IAPU.RAM;
S9xAPUPackStatus();
}
void
S9xMainLoop(void)
{
#ifndef ASMCPU
if (Settings.APUEnabled == 1)
{
#ifdef USE_SA1
if (Settings.SA1)
S9xMainLoop_SA1_APU();
else
#endif
S9xMainLoop_NoSA1_APU();
}
else
{
#ifdef USE_SA1
if (Settings.SA1)
S9xMainLoop_SA1_NoAPU();
else
#endif
S9xMainLoop_NoSA1_NoAPU();
}
#else
#ifdef ASM_SPC700
if (Settings.asmspc700)
asmMainLoop_spcAsm(&CPU);
else
#endif
asmMainLoop_spcC(&CPU);
#endif
Registers.PC = CPU.PC - CPU.PCBase;
#ifndef ASMCPU
S9xPackStatus();
#endif
S9xAPUPackStatus();
//if (CPU.Flags & SCAN_KEYS_FLAG)
// {
CPU.Flags &= ~SCAN_KEYS_FLAG;
//}
if (CPU.BRKTriggered && Settings.SuperFX && !CPU.TriedInterleavedMode2)
{
CPU.TriedInterleavedMode2 = TRUE;
CPU.BRKTriggered = FALSE;
S9xDeinterleaveMode2();
}
}
void Apu0F()
{
// BRK
#if 0
STOP("BRK");
#else
PushW((IAPU.PC + 1 - IAPU.RAM));
S9xAPUPackStatus();
Push(IAPU.P);
APUSetBreak();
APUClearInterrupt();
// XXX:Where is the BRK vector ???
IAPU.PC = IAPU.RAM + APU.ExtraRAM[0x20] + (APU.ExtraRAM[0x21] << 8);
#endif
}
/* get samples
---------------------------------------------------------------- */
void SPC_update(unsigned char *buf)
{
// APU_LOOP
int c, ic;
#if 1
for (c = 0; c < 2048000 / 32 / RATE; c ++) {
for (ic = 0; ic < 32; ic ++)
APU_EXECUTE1(); IAPU.TimerErrorCounter ++; DoTimer();
}
#else
for (APU.Cycles = 0; APU.Cycles < 204800 / RATE; APU.Cycles ++) {
APU_EXECUTE1();
++ IAPU.TimerErrorCounter;
if ((IAPU.TimerErrorCounter & 31) == 0)
DoTimer();
APURegisters.PC = IAPU.PC - IAPU.RAM;
S9xAPUPackStatus();
}
#endif
S9xMixSamples ((unsigned char *)buf, samples_per_mix);
}
void S9xMainLoop (void)
{
for (;;)
{
APU_EXECUTE();
if (CPU.Flags)
{
if (CPU.Flags & NMI_FLAG)
{
if (Timings.NMITriggerPos <= CPU.Cycles)
{
CPU.Flags &= ~NMI_FLAG;
Timings.NMITriggerPos = 0xffff;
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
Registers.PCw++;
}
S9xOpcode_NMI();
}
}
#ifdef DEBUGGER
if ((CPU.Flags & BREAK_FLAG) && !(CPU.Flags & SINGLE_STEP_FLAG))
{
for (int Break = 0; Break != 6; Break++)
{
if (S9xBreakpoint[Break].Enabled &&
S9xBreakpoint[Break].Bank == Registers.PB &&
S9xBreakpoint[Break].Address == Registers.PCw)
{
if (S9xBreakpoint[Break].Enabled == 2)
S9xBreakpoint[Break].Enabled = TRUE;
else
CPU.Flags |= DEBUG_MODE_FLAG;
}
}
}
#endif
CHECK_SOUND();
if (CPU.Flags & IRQ_PENDING_FLAG)
{
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
Registers.PCw++;
}
if (CPU.IRQActive && !Settings.DisableIRQ)
{
if (!CheckFlag(IRQ))
S9xOpcode_IRQ();
}
else
CPU.Flags &= ~IRQ_PENDING_FLAG;
}
if (CPU.Flags & SCAN_KEYS_FLAG)
break;
#ifdef DEBUGGER
if (CPU.Flags & DEBUG_MODE_FLAG)
break;
if (CPU.Flags & TRACE_FLAG)
S9xTrace();
if (CPU.Flags & SINGLE_STEP_FLAG)
{
CPU.Flags &= ~SINGLE_STEP_FLAG;
CPU.Flags |= DEBUG_MODE_FLAG;
}
#endif
}
#ifdef CPU_SHUTDOWN
CPU.PBPCAtOpcodeStart = Registers.PBPC;
#endif
register uint8 Op;
register struct SOpcodes *Opcodes;
if (CPU.PCBase)
{
Op = CPU.PCBase[Registers.PCw];
CPU.Cycles += CPU.MemSpeed;
Opcodes = ICPU.S9xOpcodes;
}
else
{
Op = S9xGetByte(Registers.PBPC);
OpenBus = Op;
Opcodes = S9xOpcodesSlow;
}
if ((Registers.PCw&MEMMAP_MASK) + ICPU.S9xOpLengths[Op] >= MEMMAP_BLOCK_SIZE)
{
uint8 *oldPCBase = CPU.PCBase;
CPU.PCBase = GetBasePointer(ICPU.ShiftedPB + ((uint16) (Registers.PCw + 4)));
if (oldPCBase!=CPU.PCBase || (Registers.PCw&~MEMMAP_MASK) == (0xffff & ~MEMMAP_MASK))
Opcodes = S9xOpcodesSlow;
}
Registers.PCw++;
(*Opcodes[Op].S9xOpcode)();
S9xUpdateAPUTimer();
if (SA1.Executing)
S9xSA1MainLoop();
if (CPU.Cycles >= CPU.NextEvent)
S9xDoHEventProcessing();
}
S9xPackStatus();
APURegisters.PC = IAPU.PC - IAPU.RAM;
S9xAPUPackStatus();
if (CPU.Flags & SCAN_KEYS_FLAG)
{
#ifdef DEBUGGER
if (!(CPU.Flags & FRAME_ADVANCE_FLAG))
#endif
S9xSyncSpeed();
CPU.Flags &= ~SCAN_KEYS_FLAG;
}
}
void S9xDoHBlankProcessing ()
{
#ifdef CPU_SHUTDOWN
CPU.WaitCounter++;
#endif
switch (CPU.WhichEvent)
{
case HBLANK_START_EVENT:
if (IPPU.HDMA && CPU.V_Counter <= PPU.ScreenHeight)
IPPU.HDMA = S9xDoHDMA (IPPU.HDMA);
break;
case HBLANK_END_EVENT:
S9xSuperFXExec ();
#ifndef STORM
if (Settings.SoundSync)
S9xGenerateSound ();
#endif
CPU.Cycles -= Settings.H_Max;
IAPU.NextAPUTimerPos -= (Settings.H_Max * 10000L);
if (IAPU.APUExecuting)
{
APU.Cycles -= Settings.H_Max;
#ifdef MK_APU
S9xCatchupCount();
#endif
}
else
APU.Cycles = 0;
CPU.NextEvent = -1;
ICPU.Scanline++;
if (++CPU.V_Counter >= (Settings.PAL ? SNES_MAX_PAL_VCOUNTER : SNES_MAX_NTSC_VCOUNTER))
{
CPU.V_Counter = 0;
Memory.FillRAM[0x213F]^=0x80;
PPU.RangeTimeOver = 0;
CPU.NMIActive = FALSE;
ICPU.Frame++;
PPU.HVBeamCounterLatched = 0;
CPU.Flags |= SCAN_KEYS_FLAG;
S9xStartHDMA ();
}
if (PPU.VTimerEnabled && !PPU.HTimerEnabled &&
CPU.V_Counter == PPU.IRQVBeamPos)
{
S9xSetIRQ (PPU_V_BEAM_IRQ_SOURCE);
}
if (CPU.V_Counter == PPU.ScreenHeight + FIRST_VISIBLE_LINE)
{
// Start of V-blank
S9xEndScreenRefresh ();
IPPU.HDMA = 0;
// Bits 7 and 6 of $4212 are computed when read in S9xGetPPU.
#ifndef OPTI
missing.dma_this_frame = 0;
#endif // OPTI
IPPU.MaxBrightness = PPU.Brightness;
PPU.ForcedBlanking = (Memory.FillRAM [0x2100] >> 7) & 1;
if(!PPU.ForcedBlanking){
PPU.OAMAddr = PPU.SavedOAMAddr;
{
uint8 tmp = 0;
if(PPU.OAMPriorityRotation)
tmp = (PPU.OAMAddr&0xFE)>>1;
if((PPU.OAMFlip&1) || PPU.FirstSprite!=tmp){
PPU.FirstSprite=tmp;
IPPU.OBJChanged=TRUE;
}
}
PPU.OAMFlip = 0;
}
Memory.FillRAM[0x4210] = 0x80 |Model->_5A22;
if (Memory.FillRAM[0x4200] & 0x80)
{
CPU.NMIActive = TRUE;
CPU.Flags |= NMI_FLAG;
CPU.NMICycleCount = CPU.NMITriggerPoint;
}
#ifdef OLD_SNAPSHOT_CODE
if (CPU.Flags & SAVE_SNAPSHOT_FLAG)
{
CPU.Flags &= ~SAVE_SNAPSHOT_FLAG;
Registers.PC = CPU.PC - CPU.PCBase;
S9xPackStatus ();
S9xAPUPackStatus ();
Snapshot (NULL);
}
#endif
}
void S9xMainLoop (void)
{
for (;;)
{
#ifdef DEBUG_MAXCOUNT
CPU.GlobalLoopCount++;
if(Settings.MaxCount && CPU.GlobalLoopCount == Settings.MaxCount) {
fprintf(stderr, "Max loop count reached: %ld \n", Settings.MaxCount);
S9xExit();
}
#endif
APU_EXECUTE ();
if (CPU.Flags)
{
if (CPU.Flags & NMI_FLAG)
{
if (--CPU.NMICycleCount == 0)
{
CPU.Flags &= ~NMI_FLAG;
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
CPU.PC++;
}
S9xOpcode_NMI ();
}
}
#ifdef DEBUGGER
if ((CPU.Flags & BREAK_FLAG) &&
!(CPU.Flags & SINGLE_STEP_FLAG))
{
for (int Break = 0; Break != 6; Break++)
{
if (S9xBreakpoint[Break].Enabled &&
S9xBreakpoint[Break].Bank == Registers.PB &&
S9xBreakpoint[Break].Address == CPU.PC - CPU.PCBase)
{
if (S9xBreakpoint[Break].Enabled == 2)
S9xBreakpoint[Break].Enabled = TRUE;
else
CPU.Flags |= DEBUG_MODE_FLAG;
}
}
}
#endif
CHECK_SOUND ();
if (CPU.Flags & IRQ_PENDING_FLAG)
{
if (CPU.IRQCycleCount == 0)
{
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
CPU.PC++;
}
if (CPU.IRQActive && !Settings.DisableIRQ)
{
if (!CheckFlag (IRQ))
S9xOpcode_IRQ ();
}
else
CPU.Flags &= ~IRQ_PENDING_FLAG;
}
else
{
if(--CPU.IRQCycleCount==0 && CheckFlag (IRQ))
CPU.IRQCycleCount=1;
}
}
#ifdef DEBUGGER
if (CPU.Flags & DEBUG_MODE_FLAG)
break;
#endif
if (CPU.Flags & SCAN_KEYS_FLAG)
break;
#ifdef DEBUGGER
if (CPU.Flags & TRACE_FLAG)
S9xTrace ();
if (CPU.Flags & SINGLE_STEP_FLAG)
{
CPU.Flags &= ~SINGLE_STEP_FLAG;
CPU.Flags |= DEBUG_MODE_FLAG;
}
#endif
}
#ifdef CPU_SHUTDOWN
CPU.PCAtOpcodeStart = CPU.PC;
#endif
CPU.Cycles += CPU.MemSpeed;
(*ICPU.S9xOpcodes [*CPU.PC++].S9xOpcode) ();
S9xUpdateAPUTimer();
if (SA1.Executing)
S9xSA1MainLoop ();
DO_HBLANK_CHECK();
}
Registers.PC = CPU.PC - CPU.PCBase;
S9xPackStatus ();
APURegisters.PC = IAPU.PC - IAPU.RAM;
S9xAPUPackStatus ();
if (CPU.Flags & SCAN_KEYS_FLAG)
{
#ifdef DEBUGGER
if (!(CPU.Flags & FRAME_ADVANCE_FLAG))
#endif
S9xSyncSpeed ();
CPU.Flags &= ~SCAN_KEYS_FLAG;
}
#ifdef DETECT_NASTY_FX_INTERLEAVE
if (CPU.BRKTriggered && Settings.SuperFX && !CPU.TriedInterleavedMode2)
{
CPU.TriedInterleavedMode2 = TRUE;
CPU.BRKTriggered = FALSE;
S9xDeinterleaveMode2 ();
}
#endif
}
void S9xMainLoop (void)
{
if(ICPU.SavedAtOp)
{
ICPU.SavedAtOp = FALSE;
Registers.PCw = CPU.PBPCAtOpcodeStart;
if(CPU.PCBase)
CPU.Cycles -= CPU.MemSpeed;
goto doOp;
}
for (;;)
{
if (CPU.Flags)
{
if (CPU.Flags & NMI_FLAG)
{
if (Timings.NMITriggerPos <= CPU.Cycles)
{
CPU.Flags &= ~NMI_FLAG;
Timings.NMITriggerPos = 0xffff;
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
Registers.PCw++;
}
S9xOpcode_NMI();
}
}
#ifdef DEBUGGER
if ((CPU.Flags & BREAK_FLAG) && !(CPU.Flags & SINGLE_STEP_FLAG))
{
for (int Break = 0; Break != 6; Break++)
{
if (S9xBreakpoint[Break].Enabled &&
S9xBreakpoint[Break].Bank == Registers.PB &&
S9xBreakpoint[Break].Address == Registers.PCw)
{
if (S9xBreakpoint[Break].Enabled == 2)
S9xBreakpoint[Break].Enabled = TRUE;
else
CPU.Flags |= DEBUG_MODE_FLAG;
}
}
}
#endif
CHECK_SOUND();
if (CPU.Flags & IRQ_FLAG)
{
if (CPU.IRQPending)
// FIXME: In case of IRQ during WRAM refresh
CPU.IRQPending = 0;
else
{
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
Registers.PCw++;
}
if (CPU.IRQActive && !Settings.DisableIRQ)
{
if (!CheckFlag(IRQ))
// in IRQ handler $4211 is supposed to be read, so IRQ_FLAG should be cleared.
S9xOpcode_IRQ();
}
else
CPU.Flags &= ~IRQ_FLAG;
}
}
if (CPU.Flags & SCAN_KEYS_FLAG)
break;
#ifdef DEBUGGER
if (CPU.Flags & DEBUG_MODE_FLAG)
break;
if (CPU.Flags & TRACE_FLAG)
S9xTrace();
if (CPU.Flags & SINGLE_STEP_FLAG)
{
CPU.Flags &= ~SINGLE_STEP_FLAG;
CPU.Flags |= DEBUG_MODE_FLAG;
}
#endif
}
#ifdef CPU_SHUTDOWN
CPU.PBPCAtOpcodeStart = Registers.PBPC;
#endif
doOp:
register uint8 Op;
register struct SOpcodes *Opcodes;
CPU.PrevCycles = CPU.Cycles;
if (CPU.PCBase)
{
Op = CPU.PCBase[Registers.PCw];
CPU.Cycles += CPU.MemSpeed;
Opcodes = ICPU.S9xOpcodes;
}
else
{
Op = S9xGetByte(Registers.PBPC);
OpenBus = Op;
Opcodes = S9xOpcodesSlow;
}
if ((Registers.PCw&MEMMAP_MASK) + ICPU.S9xOpLengths[Op] >= MEMMAP_BLOCK_SIZE)
{
uint8 *oldPCBase = CPU.PCBase;
CPU.PCBase = GetBasePointer(ICPU.ShiftedPB + ((uint16) (Registers.PCw + 4)));
if (oldPCBase!=CPU.PCBase || (Registers.PCw&~MEMMAP_MASK) == (0xffff & ~MEMMAP_MASK))
Opcodes = S9xOpcodesSlow;
}
Registers.PCw++;
(*Opcodes[Op].S9xOpcode)();
if(ICPU.SavedAtOp)
{
ICPU.SavedAtOp = false;
continue;
}
S9xAPUExecute();
if (SA1.Executing)
S9xSA1MainLoop();
while (CPU.Cycles >= CPU.NextEvent)
S9xDoHEventProcessing();
}
S9xPackStatus();
APURegisters.PC = IAPU.PC - IAPU.RAM;
S9xAPUPackStatus();
if (CPU.Flags & SCAN_KEYS_FLAG)
{
#ifdef DEBUGGER
if (!(CPU.Flags & FRAME_ADVANCE_FLAG))
#endif
S9xSyncSpeed();
CPU.Flags &= ~SCAN_KEYS_FLAG;
}
}
void S9xDoHBlankProcessing (struct SCPUState *cpu, struct SAPU *apu, struct SIAPU *iapu)
{
struct SPPU *ppu = &PPU;
struct InternalPPU *ippu = &IPPU;
#ifdef CPU_SHUTDOWN
cpu->WaitCounter++;
#endif
switch (cpu->WhichEvent)
{
case HBLANK_START_EVENT:
if (ippu->HDMA && cpu->V_Counter <= ppu->ScreenHeight)
ippu->HDMA = S9xDoHDMA (ippu, ppu, cpu);
break;
case HBLANK_END_EVENT:
#ifndef _ZAURUS
S9xSuperFXExec ();
#endif
#ifndef STORM
#endif
cpu->Cycles -= Settings.H_Max;
if (iapu->APUExecuting)
apu->Cycles -= Settings.H_Max;
else
apu->Cycles = 0;
cpu->NextEvent = -1;
ICPU.Scanline++;
if (++cpu->V_Counter > (Settings.PAL ? SNES_MAX_PAL_VCOUNTER : SNES_MAX_NTSC_VCOUNTER))
{
ppu->OAMAddr = ppu->SavedOAMAddr;
ppu->OAMFlip = 0;
cpu->V_Counter = 0;
cpu->NMIActive = FALSE;
ICPU.Frame++;
ppu->HVBeamCounterLatched = 0;
cpu->Flags |= SCAN_KEYS_FLAG;
S9xStartHDMA ();
}
if (ppu->VTimerEnabled && !ppu->HTimerEnabled &&
cpu->V_Counter == ppu->IRQVBeamPos)
{
S9xSetIRQ (PPU_V_BEAM_IRQ_SOURCE, cpu);
}
if (cpu->V_Counter == ppu->ScreenHeight + FIRST_VISIBLE_LINE)
{
// Start of V-blank
S9xEndScreenRefresh (ppu);
ppu->FirstSprite = 0;
ippu->HDMA = 0;
// Bits 7 and 6 of $4212 are computed when read in S9xGetPPU.
missing.dma_this_frame = 0;
ippu->MaxBrightness = ppu->Brightness;
ppu->ForcedBlanking = (Memory.FillRAM [0x2100] >> 7) & 1;
Memory.FillRAM[0x4210] = 0x80;
if (Memory.FillRAM[0x4200] & 0x80)
{
cpu->NMIActive = TRUE;
cpu->Flags |= NMI_FLAG;
cpu->NMICycleCount = cpu->NMITriggerPoint;
}
#ifdef OLD_SNAPSHOT_CODE
if (cpu->Flags & SAVE_SNAPSHOT_FLAG)
{
cpu->Flags &= ~SAVE_SNAPSHOT_FLAG;
Registers.PC = cpu->PC - cpu->PCBase;
S9xPackStatus ();
S9xAPUPackStatus ();
Snapshot (NULL);
}
#endif
}
if (cpu->V_Counter == ppu->ScreenHeight + 3)
S9xUpdateJoypads (&IPPU);
if (cpu->V_Counter == FIRST_VISIBLE_LINE)
{
Memory.FillRAM[0x4210] = 0;
cpu->Flags &= ~NMI_FLAG;
S9xStartScreenRefresh ();
}
if (cpu->V_Counter >= FIRST_VISIBLE_LINE &&
cpu->V_Counter < ppu->ScreenHeight + FIRST_VISIBLE_LINE)
{
RenderLine (cpu->V_Counter - FIRST_VISIBLE_LINE, ppu);
}
// Use TimerErrorCounter to skip update of SPC700 timers once
// every 128 updates. Needed because this section of code is called
// once every emulated 63.5 microseconds, which coresponds to
// 15.750KHz, but the SPC700 timers need to be updated at multiples
// of 8KHz, hence the error correction.
// IAPU.TimerErrorCounter++;
// if (IAPU.TimerErrorCounter >= )
// IAPU.TimerErrorCounter = 0;
// else
{
if (apu->TimerEnabled [2])
{
apu->Timer [2] += 4;
while (apu->Timer [2] >= apu->TimerTarget [2])
{
iapu->RAM [0xff] = (iapu->RAM [0xff] + 1) & 0xf;
apu->Timer [2] -= apu->TimerTarget [2];
#ifdef SPC700_SHUTDOWN
iapu->WaitCounter++;
iapu->APUExecuting = TRUE;
#endif
}
}
if (cpu->V_Counter & 1)
{
if (apu->TimerEnabled [0])
{
apu->Timer [0]++;
if (apu->Timer [0] >= apu->TimerTarget [0])
{
iapu->RAM [0xfd] = (iapu->RAM [0xfd] + 1) & 0xf;
apu->Timer [0] = 0;
#ifdef SPC700_SHUTDOWN
iapu->WaitCounter++;
iapu->APUExecuting = TRUE;
#endif
}
}
if (apu->TimerEnabled [1])
{
apu->Timer [1]++;
if (apu->Timer [1] >= apu->TimerTarget [1])
{
iapu->RAM [0xfe] = (iapu->RAM [0xfe] + 1) & 0xf;
apu->Timer [1] = 0;
#ifdef SPC700_SHUTDOWN
iapu->WaitCounter++;
iapu->APUExecuting = TRUE;
#endif
}
}
}
}
break; //HBLANK_END_EVENT
case HTIMER_BEFORE_EVENT:
case HTIMER_AFTER_EVENT:
if (ppu->HTimerEnabled &&
(!ppu->VTimerEnabled || cpu->V_Counter == ppu->IRQVBeamPos))
{
S9xSetIRQ (PPU_H_BEAM_IRQ_SOURCE, cpu);
}
break;
}
void
S9xMainLoop (void)
{
for (;;)
{
APU_EXECUTE ();
if (CPU.Flags)
{
if (CPU.Flags & NMI_FLAG)
{
if (--CPU.NMICycleCount == 0)
{
CPU.Flags &= ~NMI_FLAG;
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
CPU.PC++;
}
S9xOpcode_NMI ();
}
}
if (CPU.Flags & IRQ_PENDING_FLAG)
{
if (CPU.IRQCycleCount == 0)
{
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
CPU.PC++;
}
if (CPU.IRQActive && !Settings.DisableIRQ)
{
if (!CheckFlag (IRQ))
S9xOpcode_IRQ ();
}
else
CPU.Flags &= ~IRQ_PENDING_FLAG;
}
else
CPU.IRQCycleCount--;
}
if (CPU.Flags & SCAN_KEYS_FLAG)
break;
}
#ifdef CPU_SHUTDOWN
CPU.PCAtOpcodeStart = CPU.PC;
#endif
CPU.Cycles += CPU.MemSpeed;
(*ICPU.S9xOpcodes[*CPU.PC++].S9xOpcode) ();
S9xUpdateAPUTimer ();
if (SA1.Executing)
S9xSA1MainLoop ();
DO_HBLANK_CHECK ();
}
Registers.PC = CPU.PC - CPU.PCBase;
S9xPackStatus ();
(APURegistersUncached->PC) = (IAPUuncached->PC) - (IAPUuncached->RAM);
S9xAPUPackStatus ();
if (CPU.Flags & SCAN_KEYS_FLAG)
{
S9xSyncSpeed ();
CPU.Flags &= ~SCAN_KEYS_FLAG;
}
if (CPU.BRKTriggered && Settings.SuperFX && !CPU.TriedInterleavedMode2)
{
CPU.TriedInterleavedMode2 = TRUE;
CPU.BRKTriggered = FALSE;
S9xDeinterleaveMode2 ();
}
}
void S9xMainLoop (struct SRegisters * reg, struct SICPU * icpu, struct SCPUState * cpu)
{
#else
void S9xMainLoop (void)
{
struct SICPU * icpu = &ICPU;
struct SCPUState * cpu = &CPU;
struct SRegisters * reg = &Registers;
#endif
for (;;)
{
APU_EXECUTE ();
if (CPU.Flags)
{
if (CPU.Flags & NMI_FLAG)
{
if (--CPU.NMICycleCount == 0)
{
CPU.Flags &= ~NMI_FLAG;
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
++CPU.PC;
}
S9xOpcode_NMI ();
}
}
#ifdef DEBUGGER
if ((CPU.Flags & BREAK_FLAG) &&
!(CPU.Flags & SINGLE_STEP_FLAG))
{
for (int Break = 0; Break != 6; Break++)
{
if (S9xBreakpoint[Break].Enabled &&
S9xBreakpoint[Break].Bank == Registers.PB &&
S9xBreakpoint[Break].Address == CPU.PC - CPU.PCBase)
{
if (S9xBreakpoint[Break].Enabled == 2)
S9xBreakpoint[Break].Enabled = TRUE;
else
CPU.Flags |= DEBUG_MODE_FLAG;
}
}
}
#endif
CHECK_SOUND ();
if (CPU.Flags & IRQ_PENDING_FLAG)
{
if (CPU.IRQCycleCount == 0)
{
if (CPU.WaitingForInterrupt)
{
CPU.WaitingForInterrupt = FALSE;
CPU.PC++;
}
if (CPU.IRQActive && !Settings.DisableIRQ)
{
if (!CHECKFLAG (IRQ))
S9xOpcode_IRQ ();
}
else
CPU.Flags &= ~IRQ_PENDING_FLAG;
}
else
CPU.IRQCycleCount--;
}
#ifdef DEBUGGER
if (CPU.Flags & DEBUG_MODE_FLAG)
break;
#endif
if (CPU.Flags & SCAN_KEYS_FLAG)
break;
#ifdef DEBUGGER
if (CPU.Flags & TRACE_FLAG)
S9xTrace ();
if (CPU.Flags & SINGLE_STEP_FLAG)
{
CPU.Flags &= ~SINGLE_STEP_FLAG;
CPU.Flags |= DEBUG_MODE_FLAG;
}
#endif
} //if (CPU.Flags)
#ifdef CPU_SHUTDOWN
CPU.PCAtOpcodeStart = CPU.PC;
#endif
#ifdef VAR_CYCLES
CPU.Cycles += CPU.MemSpeed;
#else
CPU.Cycles += ICPU.Speed [*CPU.PC];
#endif
(*ICPU.S9xOpcodes [*CPU.PC++].S9xOpcode) (&Registers, &ICPU, &CPU);
if (SA1.Executing)
S9xSA1MainLoop ();
DO_HBLANK_CHECK();
} // for(;;)
Registers.PC = CPU.PC - CPU.PCBase;
S9xPackStatus ();
APURegisters.PC = IAPU.PC - IAPU.RAM;
S9xAPUPackStatus ();
if (CPU.Flags & SCAN_KEYS_FLAG)
{
#ifdef DEBUGGER
if (!(CPU.Flags & FRAME_ADVANCE_FLAG))
#endif
S9xSyncSpeed ();
CPU.Flags &= ~SCAN_KEYS_FLAG;
}
if (CPU.BRKTriggered && Settings.SuperFX && !CPU.TriedInterleavedMode2)
{
CPU.TriedInterleavedMode2 = TRUE;
CPU.BRKTriggered = FALSE;
S9xDeinterleaveMode2 ();
}
}
void S9xSetIRQ (uint32 source)
{
CPU.IRQActive |= source;
CPU.Flags |= IRQ_PENDING_FLAG;
CPU.IRQCycleCount = 3;
if (CPU.WaitingForInterrupt)
{
// Force IRQ to trigger immediately after WAI -
// Final Fantasy Mystic Quest crashes without this.
CPU.IRQCycleCount = 0;
CPU.WaitingForInterrupt = FALSE;
CPU.PC++;
}
}
void S9xDoHBlankProcessing ()
{
#ifdef CPU_SHUTDOWN
CPU.WaitCounter++;
#endif
switch (CPU.WhichEvent)
{
case HBLANK_START_EVENT:
if (IPPU.HDMA && CPU.V_Counter <= PPU.ScreenHeight)
IPPU.HDMA = S9xDoHDMA (IPPU.HDMA);
break;
case HBLANK_END_EVENT:
S9xSuperFXExec ();
#ifndef STORM
if (Settings.SoundSync)
S9xGenerateSound ();
#endif
CPU.Cycles -= Settings.H_Max;
if (IAPU.APUExecuting)
APU.Cycles -= Settings.H_Max;
else
APU.Cycles = 0;
CPU.NextEvent = -1;
ICPU.Scanline++;
if (++CPU.V_Counter > (Settings.PAL ? SNES_MAX_PAL_VCOUNTER : SNES_MAX_NTSC_VCOUNTER))
{
PPU.OAMAddr = PPU.SavedOAMAddr;
PPU.OAMFlip = 0;
CPU.V_Counter = 0;
CPU.NMIActive = FALSE;
ICPU.Frame++;
PPU.HVBeamCounterLatched = 0;
CPU.Flags |= SCAN_KEYS_FLAG;
S9xStartHDMA ();
}
if (PPU.VTimerEnabled && !PPU.HTimerEnabled &&
CPU.V_Counter == PPU.IRQVBeamPos)
{
S9xSetIRQ (PPU_V_BEAM_IRQ_SOURCE);
}
if (CPU.V_Counter == PPU.ScreenHeight + FIRST_VISIBLE_LINE)
{
// Start of V-blank
S9xEndScreenRefresh ();
PPU.FirstSprite = 0;
IPPU.HDMA = 0;
// Bits 7 and 6 of $4212 are computed when read in S9xGetPPU.
missing.dma_this_frame = 0;
IPPU.MaxBrightness = PPU.Brightness;
PPU.ForcedBlanking = (Memory.FillRAM [0x2100] >> 7) & 1;
Memory.FillRAM[0x4210] = 0x80;
if (Memory.FillRAM[0x4200] & 0x80)
{
CPU.NMIActive = TRUE;
CPU.Flags |= NMI_FLAG;
CPU.NMICycleCount = CPU.NMITriggerPoint;
}
#ifdef OLD_SNAPSHOT_CODE
if (CPU.Flags & SAVE_SNAPSHOT_FLAG)
{
CPU.Flags &= ~SAVE_SNAPSHOT_FLAG;
Registers.PC = CPU.PC - CPU.PCBase;
S9xPackStatus ();
S9xAPUPackStatus ();
Snapshot (NULL);
}
#endif
}
if (CPU.V_Counter == PPU.ScreenHeight + 3)
S9xUpdateJoypads ();
if (CPU.V_Counter == FIRST_VISIBLE_LINE)
{
Memory.FillRAM[0x4210] = 0;
CPU.Flags &= ~NMI_FLAG;
S9xStartScreenRefresh ();
}
if (CPU.V_Counter >= FIRST_VISIBLE_LINE &&
CPU.V_Counter < PPU.ScreenHeight + FIRST_VISIBLE_LINE)
{
RenderLine (CPU.V_Counter - FIRST_VISIBLE_LINE);
}
// Use TimerErrorCounter to skip update of SPC700 timers once
// every 128 updates. Needed because this section of code is called
// once every emulated 63.5 microseconds, which coresponds to
// 15.750KHz, but the SPC700 timers need to be updated at multiples
// of 8KHz, hence the error correction.
// IAPU.TimerErrorCounter++;
// if (IAPU.TimerErrorCounter >= )
// IAPU.TimerErrorCounter = 0;
// else
{
if (APU.TimerEnabled [2])
{
APU.Timer [2] += 4;
while (APU.Timer [2] >= APU.TimerTarget [2])
{
IAPU.RAM [0xff] = (IAPU.RAM [0xff] + 1) & 0xf;
APU.Timer [2] -= APU.TimerTarget [2];
#ifdef SPC700_SHUTDOWN
IAPU.WaitCounter++;
IAPU.APUExecuting = TRUE;
#endif
}
}
if (CPU.V_Counter & 1)
{
if (APU.TimerEnabled [0])
{
APU.Timer [0]++;
if (APU.Timer [0] >= APU.TimerTarget [0])
{
IAPU.RAM [0xfd] = (IAPU.RAM [0xfd] + 1) & 0xf;
APU.Timer [0] = 0;
#ifdef SPC700_SHUTDOWN
IAPU.WaitCounter++;
IAPU.APUExecuting = TRUE;
#endif
}
}
if (APU.TimerEnabled [1])
{
APU.Timer [1]++;
if (APU.Timer [1] >= APU.TimerTarget [1])
{
IAPU.RAM [0xfe] = (IAPU.RAM [0xfe] + 1) & 0xf;
APU.Timer [1] = 0;
#ifdef SPC700_SHUTDOWN
IAPU.WaitCounter++;
IAPU.APUExecuting = TRUE;
#endif
}
}
}
}
break; //HBLANK_END_EVENT
case HTIMER_BEFORE_EVENT:
case HTIMER_AFTER_EVENT:
if (PPU.HTimerEnabled &&
(!PPU.VTimerEnabled || CPU.V_Counter == PPU.IRQVBeamPos))
{
S9xSetIRQ (PPU_H_BEAM_IRQ_SOURCE);
}
break;
}