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System: Implement CPU overclocking [SAVEVERSION+]

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Partial credit to @CookiePLMonster as well.
This commit is contained in:
Connor McLaughlin
2020-09-29 23:29:28 +10:00
parent 8f9f039665
commit 27697d0508
19 changed files with 249 additions and 36 deletions
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26
src/core/cdrom.cpp
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@ -298,6 +298,13 @@ void CDROM::SetUseReadThread(bool enabled)
m_reader.StopThread();
}
void CDROM::CPUClockChanged()
{
// reschedule the disc read event
if (IsReadingOrPlaying())
m_drive_event->SetInterval(GetTicksForRead());
}
u8 CDROM::ReadRegister(u32 offset)
{
switch (offset)
@ -612,23 +619,24 @@ TickCount CDROM::GetAckDelayForCommand(Command command)
TickCount CDROM::GetTicksForRead()
{
return m_mode.double_speed ? (MASTER_CLOCK / 150) : (MASTER_CLOCK / 75);
const TickCount tps = System::GetTicksPerSecond();
return m_mode.double_speed ? (tps / 150) : (tps / 75);
}
TickCount CDROM::GetTicksForSeek(CDImage::LBA new_lba)
{
const TickCount tps = System::GetTicksPerSecond();
const CDImage::LBA current_lba = m_secondary_status.motor_on ? m_current_lba : 0;
const u32 lba_diff = static_cast<u32>((new_lba > current_lba) ? (new_lba - current_lba) : (current_lba - new_lba));
// Formula from Mednafen.
TickCount ticks = std::max<TickCount>(
20000, static_cast<u32>(
((static_cast<u64>(lba_diff) * static_cast<u64>(MASTER_CLOCK) * static_cast<u64>(1000)) / (72 * 60 * 75)) /
1000));
((static_cast<u64>(lba_diff) * static_cast<u64>(tps) * static_cast<u64>(1000)) / (72 * 60 * 75)) / 1000));
if (!m_secondary_status.motor_on)
ticks += MASTER_CLOCK;
ticks += tps;
if (lba_diff >= 2550)
ticks += static_cast<TickCount>(u64(MASTER_CLOCK) * 300 / 1000);
ticks += static_cast<TickCount>((u64(tps) * 300) / 1000);
else
{
// When paused, the CDC seems to keep reading the disc until it hits the position it's set to, then skip 10-15
@ -644,7 +652,7 @@ TickCount CDROM::GetTicksForSeek(CDImage::LBA new_lba)
m_current_double_speed = m_mode.double_speed;
// Approximate time for the motor to change speed?
ticks += static_cast<u32>(static_cast<double>(MASTER_CLOCK) * 0.1);
ticks += static_cast<u32>(static_cast<double>(tps) * 0.1);
}
Log_DevPrintf("Seek time for %u LBAs: %d", lba_diff, ticks);
@ -788,7 +796,7 @@ void CDROM::ExecuteCommand()
SendACKAndStat();
m_drive_state = DriveState::ReadingTOC;
m_drive_event->Schedule(MASTER_CLOCK / 2); // half a second
m_drive_event->Schedule(System::GetTicksPerSecond() / 2); // half a second
}
EndCommand();
@ -874,7 +882,7 @@ void CDROM::ExecuteCommand()
m_async_command_parameter = session;
m_drive_state = DriveState::ChangingSession;
m_drive_event->Schedule(MASTER_CLOCK / 2); // half a second
m_drive_event->Schedule(System::GetTicksPerSecond() / 2); // half a second
}
EndCommand();
@ -1011,7 +1019,7 @@ void CDROM::ExecuteCommand()
SendACKAndStat();
m_drive_state = DriveState::Resetting;
m_drive_event->Schedule(MASTER_CLOCK);
m_drive_event->Schedule(System::GetTicksPerSecond());
}
EndCommand();