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IRQ: Enabling vertical irqs on the scanline that matches the settings should trigger an IRQ right away

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This commit is contained in:
Sour 2019-04-04 17:50:23 -04:00
parent 260e0f089d
commit ec306ce406
1 changed files with 6 additions and 1 deletions
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7
Core/InternalRegisters.cpp
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@ -128,6 +128,11 @@ void InternalRegisters::Write(uint16_t addr, uint8_t value)
{ {
switch(addr) { switch(addr) {
case 0x4200: case 0x4200:
if((value & 0x20) && !_enableVerticalIrq && _console->GetPpu()->GetScanline() == _verticalTimer) {
//When enabling vertical irqs, if the current scanline matches the target scanline, set the irq flag right away
_console->GetCpu()->SetIrqSource(IrqSource::Ppu);
}
_enableNmi = (value & 0x80) != 0; _enableNmi = (value & 0x80) != 0;
_enableVerticalIrq = (value & 0x20) != 0; _enableVerticalIrq = (value & 0x20) != 0;
_enableHorizontalIrq = (value & 0x10) != 0; _enableHorizontalIrq = (value & 0x10) != 0;
@ -136,7 +141,7 @@ void InternalRegisters::Write(uint16_t addr, uint8_t value)
//TODO VERIFY //TODO VERIFY
_console->GetCpu()->ClearIrqSource(IrqSource::Ppu); _console->GetCpu()->ClearIrqSource(IrqSource::Ppu);
} }
_enableAutoJoypadRead = (value & 0x01) != 0; _enableAutoJoypadRead = (value & 0x01) != 0;
break; break;