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snes9x
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Fixed IRQ handling. Dumb me.

This commit is contained in:
Brandon Wright 2018-05-19 18:12:42 -05:00
parent 7dec8a1f9e
commit a74fe2f623
1 changed files with 13 additions and 13 deletions
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26
ppu.cpp
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@ -274,14 +274,6 @@ static int CyclesUntilNext (int hc, int vc)
int32 total = 0;
int vpos = CPU.V_Counter;
// Advance to next hc
total = (hc - CPU.Cycles);
if (total < 0)
{
total += Timings.H_Max;
vpos++;
}
if (vc - vpos >= 0)
{
// It's still in this frame */
@ -302,6 +294,8 @@ static int CyclesUntilNext (int hc, int vc)
total -= ONE_DOT_CYCLE;
}
total += hc;
return total;
}
@ -333,16 +327,22 @@ void S9xUpdateIRQPositions (void)
}
else if (PPU.HTimerEnabled && !PPU.VTimerEnabled)
{
Timings.NextIRQTimer = PPU.HTimerPosition - CPU.Cycles;
if (Timings.NextIRQTimer < 0)
Timings.NextIRQTimer = PPU.HTimerPosition;
if (CPU.Cycles > Timings.NextIRQTimer)
Timings.NextIRQTimer += Timings.H_Max;
}
else if (!PPU.HTimerEnabled && PPU.VTimerEnabled)
{
if (CPU.V_Counter == PPU.VTimerPosition)
Timings.NextIRQTimer = 0;
else
Timings.NextIRQTimer = CyclesUntilNext (0, PPU.VTimerPosition);
}
else
{
Timings.NextIRQTimer =
CyclesUntilNext (PPU.HTimerEnabled ? PPU.HTimerPosition : 0,
PPU.VTimerPosition);
Timings.NextIRQTimer = CyclesUntilNext (PPU.HTimerPosition, PPU.VTimerPosition);
}
#ifdef DEBUGGER
S9xTraceFormattedMessage("--- IRQ Timer set HTimer:%d Pos:%04d VTimer:%d Pos:%03d",
PPU.HTimerEnabled, PPU.HTimerPosition, PPU.VTimerEnabled, PPU.VTimerPosition);