void S9xDoHEventProcessing (void)
{
#ifdef DEBUGGER
static char eventname[7][32] =
{
"",
"HC_HBLANK_START_EVENT",
"HC_HDMA_START_EVENT ",
"HC_HCOUNTER_MAX_EVENT",
"HC_HDMA_INIT_EVENT ",
"HC_RENDER_EVENT ",
"HC_WRAM_REFRESH_EVENT"
};
#endif
#ifdef DEBUGGER
if (Settings.TraceHCEvent)
S9xTraceFormattedMessage("--- HC event processing (%s) expected HC:%04d executed HC:%04d",
eventname[CPU.WhichEvent], CPU.NextEvent, CPU.Cycles);
#endif
switch (CPU.WhichEvent)
{
case HC_HBLANK_START_EVENT:
S9xReschedule();
break;
case HC_HDMA_START_EVENT:
S9xReschedule();
if (PPU.HDMA && CPU.V_Counter <= PPU.ScreenHeight)
{
#ifdef DEBUGGER
S9xTraceFormattedMessage("*** HDMA Transfer HC:%04d, Channel:%02x", CPU.Cycles, PPU.HDMA);
#endif
PPU.HDMA = S9xDoHDMA(PPU.HDMA);
}
break;
case HC_HCOUNTER_MAX_EVENT:
if (Settings.SuperFX)
{
if (!SuperFX.oneLineDone)
S9xSuperFXExec();
SuperFX.oneLineDone = FALSE;
}
S9xAPUEndScanline();
CPU.Cycles -= Timings.H_Max;
CPU.PrevCycles -= Timings.H_Max;
S9xAPUSetReferenceTime(CPU.Cycles);
if ((Timings.NMITriggerPos != 0xffff) && (Timings.NMITriggerPos >= Timings.H_Max))
Timings.NMITriggerPos -= Timings.H_Max;
CPU.V_Counter++;
if (CPU.V_Counter >= Timings.V_Max) // V ranges from 0 to Timings.V_Max - 1
{
CPU.V_Counter = 0;
Timings.InterlaceField ^= 1;
// From byuu:
// [NTSC]
// interlace mode has 525 scanlines: 263 on the even frame, and 262 on the odd.
// non-interlace mode has 524 scanlines: 262 scanlines on both even and odd frames.
// [PAL] <PAL info is unverified on hardware>
// interlace mode has 625 scanlines: 313 on the even frame, and 312 on the odd.
// non-interlace mode has 624 scanlines: 312 scanlines on both even and odd frames.
if (IPPU.Interlace && !Timings.InterlaceField)
Timings.V_Max = Timings.V_Max_Master + 1; // 263 (NTSC), 313?(PAL)
else
Timings.V_Max = Timings.V_Max_Master; // 262 (NTSC), 312?(PAL)
Memory.FillRAM[0x213F] ^= 0x80;
PPU.RangeTimeOver = 0;
// FIXME: reading $4210 will wait 2 cycles, then perform reading, then wait 4 more cycles.
Memory.FillRAM[0x4210] = Model->_5A22;
CPU.NMILine = FALSE;
Timings.NMITriggerPos = 0xffff;
ICPU.Frame++;
PPU.HVBeamCounterLatched = 0;
CPU.Flags |= SCAN_KEYS_FLAG;
}
// From byuu:
// In non-interlace mode, there are 341 dots per scanline, and 262 scanlines per frame.
// On odd frames, scanline 240 is one dot short.
// In interlace mode, there are always 341 dots per scanline. Even frames have 263 scanlines,
// and odd frames have 262 scanlines.
// Interlace mode scanline 240 on odd frames is not missing a dot.
if (CPU.V_Counter == 240 && !IPPU.Interlace && Timings.InterlaceField) // V=240
Timings.H_Max = Timings.H_Max_Master - ONE_DOT_CYCLE; // HC=1360
else
Timings.H_Max = Timings.H_Max_Master; // HC=1364
if (Model->_5A22 == 2)
{
if (CPU.V_Counter != 240 || IPPU.Interlace || !Timings.InterlaceField) // V=240
{
if (Timings.WRAMRefreshPos == SNES_WRAM_REFRESH_HC_v2 - ONE_DOT_CYCLE) // HC=534
Timings.WRAMRefreshPos = SNES_WRAM_REFRESH_HC_v2; // HC=538
else
Timings.WRAMRefreshPos = SNES_WRAM_REFRESH_HC_v2 - ONE_DOT_CYCLE; // HC=534
}
}
else
Timings.WRAMRefreshPos = SNES_WRAM_REFRESH_HC_v1;
if (CPU.V_Counter == PPU.ScreenHeight + FIRST_VISIBLE_LINE) // VBlank starts from V=225(240).
{
S9xEndScreenRefresh();
PPU.HDMA = 0;
// Bits 7 and 6 of $4212 are computed when read in S9xGetPPU.
#ifdef DEBUGGER
missing.dma_this_frame = 0;
#endif
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;
}
// FIXME: writing to $4210 will wait 6 cycles.
Memory.FillRAM[0x4210] = 0x80 | Model->_5A22;
if (Memory.FillRAM[0x4200] & 0x80)
{
// FIXME: triggered at HC=6, checked just before the final CPU cycle,
// then, when to call S9xOpcode_NMI()?
CPU.NMILine = TRUE;
Timings.NMITriggerPos = 6 + 6;
}
}
void S9xDoHEventProcessing (void)
{
uint8 tmp;
switch (CPU.WhichEvent)
{
case HC_HBLANK_START_EVENT:
if (PPU.HTimerPosition == Timings.HBlankStart)
S9xCheckMissingHTimerPosition();
S9xReschedule();
break;
case HC_HDMA_START_EVENT:
if (PPU.HTimerPosition == Timings.HDMAStart)
S9xCheckMissingHTimerPosition();
S9xReschedule();
if (PPU.HDMA && CPU.V_Counter <= PPU.ScreenHeight)
PPU.HDMA = S9xDoHDMA(PPU.HDMA);
break;
case HC_HCOUNTER_MAX_EVENT:
if (Settings.SuperFX && !SuperFX.oneLineDone && CHECK_EXEC_SUPERFX())
S9xSuperFXExec();
SuperFX.oneLineDone = FALSE; // do this even without SFX
S9xAPUExecute();
CPU.Cycles -= Timings.H_Max;
S9xAPUSetReferenceTime(CPU.Cycles);
if ((Timings.NMITriggerPos != 0xffff) && (Timings.NMITriggerPos >= Timings.H_Max))
Timings.NMITriggerPos -= Timings.H_Max;
CPU.V_Counter++;
if (CPU.V_Counter >= Timings.V_Max) /* V ranges from 0 to Timings.V_Max - 1 */
{
CPU.V_Counter = 0;
Timings.InterlaceField ^= 1;
/* From byuu:
[NTSC]
interlace mode has 525 scanlines: 263 on
the even frame, and 262 on the odd.
non-interlace mode has 524 scanlines:
262 scanlines on both even and odd frames.
[PAL] <PAL info is unverified on hardware>
interlace mode has 625 scanlines: 313 on
the even frame, and 312 on the odd.
non-interlace mode has 624 scanlines:
312 scanlines on both even and odd frames. */
Timings.V_Max = Timings.V_Max_Master; /* 262 (NTSC), 312?(PAL) */
if (IPPU.Interlace && !Timings.InterlaceField)
Timings.V_Max += 1; /* 263 (NTSC), 313?(PAL) */
Memory.FillRAM[0x213F] ^= 0x80;
PPU.RangeTimeOver = 0;
/* FIXME: reading $4210 will wait 2 cycles,
then perform reading, then wait 4 more cycles. */
Memory.FillRAM[0x4210] = MAX_5A22_VERSION;
CPU.Flags &= ~NMI_FLAG;
Timings.NMITriggerPos = 0xffff;
ICPU.Frame++;
PPU.HVBeamCounterLatched = 0;
CPU.Flags |= SCAN_KEYS_FLAG;
}
/* From byuu:
In non-interlace mode, there are 341 dots
per scanline, and 262 scanlines per frame.
On odd frames, scanline 240 is one dot short.
In interlace mode, there are always 341 dots
per scanline. Even frames have 263 scanlines,
and odd frames have 262 scanlines.
Interlace mode scanline 240 on odd frames is
not missing a dot. */
Timings.H_Max = Timings.H_Max_Master; /* HC=1364 */
if (CPU.V_Counter == 240 && !IPPU.Interlace && Timings.InterlaceField) /* V=240 */
Timings.H_Max -= ONE_DOT_CYCLE; /* HC=1360 */
if (CPU.V_Counter != 240 || IPPU.Interlace || !Timings.InterlaceField) /* V=240 */
{
if (Timings.WRAMRefreshPos == SNES_WRAM_REFRESH_HC_v2_MIN_ONE_DOT_CYCLE) /* HC=534 */
Timings.WRAMRefreshPos = SNES_WRAM_REFRESH_HC_v2; /* HC=538 */
else
Timings.WRAMRefreshPos = SNES_WRAM_REFRESH_HC_v2_MIN_ONE_DOT_CYCLE; /* HC=534 */
}
if (PPU.HTimerPosition == 0)
S9xCheckMissingHTimerPosition();
if (CPU.V_Counter == PPU.ScreenHeight + FIRST_VISIBLE_LINE) /* VBlank starts from V=225(240). */
{
S9xEndScreenRefresh();
PPU.HDMA = 0;
/* Bits 7 and 6 of $4212 are computed when read in S9xGetPPU. */
PPU.ForcedBlanking = (Memory.FillRAM[0x2100] >> 7) & 1;
if (!PPU.ForcedBlanking)
{
PPU.OAMAddr = PPU.SavedOAMAddr;
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;
}
/* FIXME: writing to $4210 will wait 6 cycles. */
Memory.FillRAM[0x4210] = 0x80 | MAX_5A22_VERSION;
if (Memory.FillRAM[0x4200] & 0x80)
{
/* FIXME: triggered at HC=6, checked just
before the final CPU cycle, then, when to
call S9xOpcode_NMI()? */
CPU.Flags |= NMI_FLAG;
Timings.NMITriggerPos = 6 + 6;
}
}
