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Check for the short scanline on the timer scanline, not the current one.

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This commit is contained in:
Brandon Wright 2018-05-30 13:27:30 -05:00
parent 6b871cd104
commit 3063da79b8
1 changed files with 30 additions and 18 deletions
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48
ppu.cpp
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@ -307,45 +307,57 @@ static int CyclesUntilNext (int hc, int vc)
void S9xUpdateIRQPositions (bool initial)
{
PPU.HTimerPosition = PPU.IRQHBeamPos * ONE_DOT_CYCLE + Timings.IRQTriggerCycles;
if (Timings.H_Max == Timings.H_Max_Master) // 1364
{
if (PPU.IRQHBeamPos > 322)
PPU.HTimerPosition += (ONE_DOT_CYCLE / 2);
if (PPU.IRQHBeamPos > 326)
PPU.HTimerPosition += (ONE_DOT_CYCLE / 2);
}
PPU.HTimerPosition += PPU.IRQHBeamPos > 322 ? (ONE_DOT_CYCLE / 2) : 0;
PPU.HTimerPosition += PPU.IRQHBeamPos > 326 ? (ONE_DOT_CYCLE / 2) : 0;
PPU.VTimerPosition = PPU.IRQVBeamPos;
if ((PPU.HTimerPosition >= Timings.H_Max) && (PPU.IRQHBeamPos < 340) && PPU.HTimerEnabled)
{
PPU.HTimerPosition -= Timings.H_Max;
PPU.VTimerPosition++;
// FIXME
if (PPU.VTimerPosition >= Timings.V_Max)
PPU.VTimerPosition = 0;
}
if (!PPU.HTimerEnabled && !PPU.VTimerEnabled)
{
Timings.NextIRQTimer = 0x0fffffff;
}
else if (PPU.HTimerEnabled && !PPU.VTimerEnabled)
{
int v_pos = CPU.V_Counter;
Timings.NextIRQTimer = PPU.HTimerPosition;
if (CPU.Cycles > Timings.NextIRQTimer - Timings.IRQTriggerCycles)
{
Timings.NextIRQTimer += Timings.H_Max;
v_pos++;
}
// Check for short dot scanline
if (v_pos == 240 && Timings.InterlaceField && !IPPU.Interlace)
{
Timings.NextIRQTimer -= PPU.IRQHBeamPos <= 322 ? ONE_DOT_CYCLE / 2 : 0;
Timings.NextIRQTimer -= PPU.IRQHBeamPos <= 326 ? ONE_DOT_CYCLE / 2 : 0;
}
}
else if (!PPU.HTimerEnabled && PPU.VTimerEnabled)
{
if (CPU.V_Counter == PPU.VTimerPosition && initial)
Timings.NextIRQTimer = Timings.IRQTriggerCycles;
Timings.NextIRQTimer = CPU.Cycles + Timings.IRQTriggerCycles;
else
Timings.NextIRQTimer = CyclesUntilNext (Timings.IRQTriggerCycles, PPU.VTimerPosition);
}
else
{
Timings.NextIRQTimer = CyclesUntilNext (PPU.HTimerPosition, PPU.VTimerPosition);
// Check for short dot scanline
int field = Timings.InterlaceField;
if (PPU.VTimerPosition < CPU.V_Counter ||
(PPU.VTimerPosition == CPU.V_Counter && Timings.NextIRQTimer > Timings.H_Max))
{
field = !field;
}
if (PPU.VTimerPosition == 240 && field && !IPPU.Interlace)
{
Timings.NextIRQTimer -= PPU.IRQHBeamPos <= 322 ? ONE_DOT_CYCLE / 2 : 0;
Timings.NextIRQTimer -= PPU.IRQHBeamPos <= 326 ? ONE_DOT_CYCLE / 2 : 0;
}
}
#ifdef DEBUGGER