diff options
Diffstat (limited to 'src/cpuexec.c')
| -rw-r--r-- | src/cpuexec.c | 764 |
1 files changed, 381 insertions, 383 deletions
diff --git a/src/cpuexec.c b/src/cpuexec.c index 3cd25c3..9306390 100644 --- a/src/cpuexec.c +++ b/src/cpuexec.c @@ -4,10 +4,10 @@ * (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
* Jerremy Koot (jkoot@snes9x.com)
*
- * Super FX C emulator code
+ * Super FX C emulator code
* (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
* Gary Henderson.
- * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
+ * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
*
* DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
* C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
@@ -38,9 +38,9 @@ * Super NES and Super Nintendo Entertainment System are trademarks of
* Nintendo Co., Limited and its subsidiary companies.
*/
-
-
+
+
#include "snes9x.h"
#include "memmap.h"
@@ -64,478 +64,476 @@ void (*S9x_Current_HBlank_Event)(); #ifndef ASMCPU
- #ifdef USE_SA1
-void S9xMainLoop_SA1_APU (void)
+#ifdef USE_SA1
+void S9xMainLoop_SA1_APU(void)
{
- for (;;)
- {
+ for (;;)
+ {
asm_APU_EXECUTE(1);
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;
- }
+ {
+ 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
#ifdef VAR_CYCLES
- CPU.Cycles += CPU.MemSpeed;
+ CPU.Cycles += CPU.MemSpeed;
#else
- CPU.Cycles += ICPU.Speed [*CPU.PC];
+ CPU.Cycles += ICPU.Speed [*CPU.PC];
#endif
- (*ICPU.S9xOpcodes[*CPU.PC++].S9xOpcode) ();
+ (*ICPU.S9xOpcodes[*CPU.PC++].S9xOpcode)();
//S9xUpdateAPUTimer ();
if (SA1.Executing)
- S9xSA1MainLoop ();
- DO_HBLANK_CHECK ();
+ S9xSA1MainLoop();
+ DO_HBLANK_CHECK();
- }
+ }
}
-void S9xMainLoop_SA1_NoAPU (void)
+void S9xMainLoop_SA1_NoAPU(void)
{
- for (;;)
- {
+ for (;;)
+ {
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;
- }
+ {
+ 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
#ifdef VAR_CYCLES
- CPU.Cycles += CPU.MemSpeed;
+ CPU.Cycles += CPU.MemSpeed;
#else
- CPU.Cycles += ICPU.Speed [*CPU.PC];
+ CPU.Cycles += ICPU.Speed [*CPU.PC];
#endif
- (*ICPU.S9xOpcodes[*CPU.PC++].S9xOpcode) ();
+ (*ICPU.S9xOpcodes[*CPU.PC++].S9xOpcode)();
//S9xUpdateAPUTimer ();
if (SA1.Executing)
- S9xSA1MainLoop ();
- DO_HBLANK_CHECK ();
+ S9xSA1MainLoop();
+ DO_HBLANK_CHECK();
- }
+ }
}
- // USE_SA1
- #endif
+// USE_SA1
+#endif
-void S9xMainLoop_NoSA1_APU (void)
+void S9xMainLoop_NoSA1_APU(void)
{
- for (;;)
- {
+ for (;;)
+ {
asm_APU_EXECUTE(1);
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;
- }
+ {
+ 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
#ifdef VAR_CYCLES
- CPU.Cycles += CPU.MemSpeed;
+ CPU.Cycles += CPU.MemSpeed;
#else
- CPU.Cycles += ICPU.Speed [*CPU.PC];
+ CPU.Cycles += ICPU.Speed [*CPU.PC];
#endif
- (*ICPU.S9xOpcodes[*CPU.PC++].S9xOpcode) ();
+ (*ICPU.S9xOpcodes[*CPU.PC++].S9xOpcode)();
//S9xUpdateAPUTimer ();
- DO_HBLANK_CHECK ();
- }
+ DO_HBLANK_CHECK();
+ }
}
-void S9xMainLoop_NoSA1_NoAPU (void)
+void S9xMainLoop_NoSA1_NoAPU(void)
{
- for (;;)
- {
+ for (;;)
+ {
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;
- }
+ {
+ 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
#ifdef VAR_CYCLES
- CPU.Cycles += CPU.MemSpeed;
+ CPU.Cycles += CPU.MemSpeed;
#else
- CPU.Cycles += ICPU.Speed [*CPU.PC];
+ CPU.Cycles += ICPU.Speed [*CPU.PC];
#endif
- (*ICPU.S9xOpcodes[*CPU.PC++].S9xOpcode) ();
+ (*ICPU.S9xOpcodes[*CPU.PC++].S9xOpcode)();
//S9xUpdateAPUTimer ();
- DO_HBLANK_CHECK ();
+ DO_HBLANK_CHECK();
- }
+ }
}
-#endif
+#endif
void
-S9xMainLoop (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 S9xMainLoop_NoSA1_NoAPU();
- #endif
-
- }
-#else
- if (Settings.asmspc700) asmMainLoop_spcAsm(&CPU);
- else asmMainLoop_spcC(&CPU);
+ 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 S9xMainLoop_NoSA1_NoAPU();
+#endif
+
+ }
+#else
+ if (Settings.asmspc700) asmMainLoop_spcAsm(&CPU);
+ else asmMainLoop_spcC(&CPU);
#endif
- Registers.PC = CPU.PC - CPU.PCBase;
+ Registers.PC = CPU.PC - CPU.PCBase;
#ifndef ASMCPU
- S9xPackStatus ();
+ S9xPackStatus();
#endif
- S9xAPUPackStatus ();
+ S9xAPUPackStatus();
- //if (CPU.Flags & SCAN_KEYS_FLAG)
+ //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 ();
- }
+ CPU.Flags &= ~SCAN_KEYS_FLAG;
+ //}
+
+ if (CPU.BRKTriggered && Settings.SuperFX && !CPU.TriedInterleavedMode2)
+ {
+ CPU.TriedInterleavedMode2 = TRUE;
+ CPU.BRKTriggered = FALSE;
+ S9xDeinterleaveMode2();
+ }
}
-void S9xSetIRQ (uint32 source)
+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++;
- }
+ 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 S9xClearIRQ (uint32 source)
+void S9xClearIRQ(uint32 source)
{
- CLEAR_IRQ_SOURCE (source);
+ CLEAR_IRQ_SOURCE(source);
}
-void S9xDoHBlankProcessing ()
+void S9xDoHBlankProcessing()
{
#ifdef CPU_SHUTDOWN
- CPU.WaitCounter++;
+ 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:
- asm_APU_EXECUTE(3); // notaz: run spc700 in sound 'speed hack' mode
- if(Settings.SuperFX)
- S9xSuperFXExec ();
-
- CPU.Cycles -= Settings.H_Max;
- if (/*IAPU.APUExecuting*/CPU.APU_APUExecuting)
- CPU.APU_Cycles -= Settings.H_Max;
- else
- CPU.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;
- 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.
- missing.dma_this_frame = 0;
- IPPU.MaxBrightness = PPU.Brightness;
- PPU.ForcedBlanking = (Memory.FillRAM [0x2100] >> 7) & 1;
-
- if(!PPU.ForcedBlanking){
- PPU.OAMAddr = PPU.SavedOAMAddr;
- PPU.OAMFlip = 0;
- PPU.FirstSprite = 0;
- if(PPU.OAMPriorityRotation)
- PPU.FirstSprite = PPU.OAMAddr>>1;
- }
-
- Memory.FillRAM[0x4210] = 0x80;
- if (Memory.FillRAM[0x4200] & 0x80)
- {
- CPU.NMIActive = TRUE;
- CPU.Flags |= NMI_FLAG;
- CPU.NMICycleCount = CPU.NMITriggerPoint;
- }
-
- }
-
- 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*/CPU.APU_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*/CPU.APU_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*/CPU.APU_APUExecuting = TRUE;
-#endif
- }
- }
- }
- }
- break;
- 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;
- }
- S9xReschedule ();
+ 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:
+ asm_APU_EXECUTE(3); // notaz: run spc700 in sound 'speed hack' mode
+ if (Settings.SuperFX)
+ S9xSuperFXExec();
+
+ CPU.Cycles -= Settings.H_Max;
+ if (/*IAPU.APUExecuting*/CPU.APU_APUExecuting)
+ CPU.APU_Cycles -= Settings.H_Max;
+ else
+ CPU.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;
+ 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.
+ missing.dma_this_frame = 0;
+ IPPU.MaxBrightness = PPU.Brightness;
+ PPU.ForcedBlanking = (Memory.FillRAM [0x2100] >> 7) & 1;
+
+ if (!PPU.ForcedBlanking)
+ {
+ PPU.OAMAddr = PPU.SavedOAMAddr;
+ PPU.OAMFlip = 0;
+ PPU.FirstSprite = 0;
+ if (PPU.OAMPriorityRotation)
+ PPU.FirstSprite = PPU.OAMAddr >> 1;
+ }
+
+ Memory.FillRAM[0x4210] = 0x80;
+ if (Memory.FillRAM[0x4200] & 0x80)
+ {
+ CPU.NMIActive = TRUE;
+ CPU.Flags |= NMI_FLAG;
+ CPU.NMICycleCount = CPU.NMITriggerPoint;
+ }
+
+ }
+
+ 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*/CPU.APU_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*/CPU.APU_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*/CPU.APU_APUExecuting = TRUE;
+#endif
+ }
+ }
+ }
+ }
+ break;
+ 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;
+ }
+ S9xReschedule();
}
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