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CDROM: Add timing for speed changes/adjust seek timing

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This makes the BIOS take longer to load the executable off the disc,
giving the sound effects longer to fade out and reducing the overlap
with the game.
pull/285/head
Connor McLaughlin 6 years ago
parent 809b9f89ca
commit 05e4e7d262
3 changed files with 43 additions and 23 deletions
Show Stats Download Patch File Download Diff File

57
src/core/cdrom.cpp
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@ -50,6 +50,7 @@ void CDROM::SoftReset()
m_secondary_status.bits = 0;
m_secondary_status.motor_on = HasMedia();
m_mode.bits = 0;
m_current_double_speed = false;
m_interrupt_enable_register = INTERRUPT_REGISTER_MASK;
m_interrupt_flag_register = 0;
m_pending_async_interrupt = 0;
@ -111,6 +112,7 @@ bool CDROM::DoState(StateWrapper& sw)
sw.Do(&m_status.bits);
sw.Do(&m_secondary_status.bits);
sw.Do(&m_mode.bits);
sw.Do(&m_current_double_speed);
sw.Do(&m_interrupt_enable_register);
sw.Do(&m_interrupt_flag_register);
sw.Do(&m_pending_async_interrupt);
@ -526,7 +528,7 @@ void CDROM::UpdateInterruptRequest()
m_interrupt_controller->InterruptRequest(InterruptController::IRQ::CDROM);
}
TickCount CDROM::GetAckDelayForCommand(Command command) const
TickCount CDROM::GetAckDelayForCommand(Command command)
{
if (command == Command::Init)
{
@ -541,27 +543,36 @@ TickCount CDROM::GetAckDelayForCommand(Command command) const
return HasMedia() ? default_ack_delay_with_disc : default_ack_delay_no_disc;
}
TickCount CDROM::GetTicksForRead() const
TickCount CDROM::GetTicksForRead()
{
return m_mode.double_speed ? (MASTER_CLOCK / 150) : (MASTER_CLOCK / 75);
}
TickCount CDROM::GetTicksForSeek() const
TickCount CDROM::GetTicksForSeek(CDImage::LBA new_lba)
{
const CDImage::LBA current_lba = m_secondary_status.motor_on ? m_reader.GetLastReadSector() : 0;
const CDImage::LBA new_lba = m_setloc_position.ToLBA();
const CDImage::LBA current_lba = m_secondary_status.motor_on ? m_last_requested_sector : 0;
const u32 lba_diff = static_cast<u32>((new_lba > current_lba) ? (new_lba - current_lba) : (current_lba - new_lba));
// const TickCount ticks = static_cast<TickCount>(20000 + lba_diff * 100);
// Formula from Mednafen.
TickCount ticks = std::max<TickCount>(20000, lba_diff * MASTER_CLOCK * 1000 / (72 * 60 * 75) / 1000);
if (!m_secondary_status.motor_on)
ticks += MASTER_CLOCK;
else if (m_drive_state == DriveState::Idle) // paused
ticks += 1237952 << (BoolToUInt8(!m_mode.double_speed));
if (lba_diff >= 2550)
ticks += static_cast<TickCount>(u64(MASTER_CLOCK) * 300 / 1000);
else if (m_drive_state == DriveState::Idle) // paused
ticks += 1237952 << (BoolToUInt8(!m_mode.double_speed));
else if (lba_diff >= 3 && lba_diff < 12)
ticks += MASTER_CLOCK / (75 << (BoolToUInt8(!m_mode.double_speed)) << 2);
if (m_mode.double_speed != m_current_double_speed)
{
Log_DevPrintf("Switched from %s to %s speed", m_current_double_speed ? "double" : "single",
m_mode.double_speed ? "double" : "single");
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) * 1.5);
}
Log_DevPrintf("Seek time for %u LBAs: %d", lba_diff, ticks);
return ticks;
@ -631,7 +642,7 @@ void CDROM::ExecuteCommand()
SendACKAndStat();
m_drive_state = DriveState::ReadingID;
m_drive_event->Schedule(18000);
m_drive_event->Schedule(GetTicksForSeek(0) + GetTicksForRead());
EndCommand();
return;
@ -818,7 +829,7 @@ void CDROM::ExecuteCommand()
SendACKAndStat();
m_drive_state = DriveState::Resetting;
m_drive_event->Schedule(80000);
m_drive_event->Schedule(400000);
EndCommand();
return;
@ -837,7 +848,7 @@ void CDROM::ExecuteCommand()
SendACKAndStat();
m_drive_state = DriveState::Resetting;
m_drive_event->Schedule(80000);
m_drive_event->Schedule(MASTER_CLOCK);
}
EndCommand();
@ -1218,7 +1229,8 @@ void CDROM::BeginSeeking(bool logical, bool read_after_seek, bool play_after_see
Log_DebugPrintf("Seeking to [%02u:%02u:%02u] (LBA %u) (%s)", m_setloc_position.minute, m_setloc_position.second,
m_setloc_position.frame, m_setloc_position.ToLBA(), logical ? "logical" : "physical");
const TickCount seek_time = GetTicksForSeek();
const CDImage::LBA seek_lba = m_setloc_position.ToLBA();
const TickCount seek_time = GetTicksForSeek(seek_lba);
m_secondary_status.ClearActiveBits();
m_secondary_status.motor_on = true;
@ -1227,7 +1239,7 @@ void CDROM::BeginSeeking(bool logical, bool read_after_seek, bool play_after_see
m_drive_state = logical ? DriveState::SeekingLogical : DriveState::SeekingPhysical;
m_drive_event->SetIntervalAndSchedule(seek_time);
m_last_requested_sector = m_setloc_position.ToLBA();
m_last_requested_sector = seek_lba;
m_reader.QueueReadSector(m_last_requested_sector);
}
@ -1394,12 +1406,19 @@ void CDROM::DoIDRead()
{
flags_byte |= (1 << 6); // Disc Missing
}
else if (m_system->GetSettings().cdrom_region_check &&
(m_disc_region == DiscRegion::Other ||
m_system->GetRegion() != System::GetConsoleRegionForDiscRegion(m_disc_region)))
else
{
stat_byte |= STAT_ID_ERROR;
flags_byte |= (1 << 7); // Unlicensed
// this is where it would get read from the start of the disc?
m_last_requested_sector = 0;
m_reader.QueueReadSector(m_last_requested_sector);
if (m_system->GetSettings().cdrom_region_check &&
(m_disc_region == DiscRegion::Other ||
m_system->GetRegion() != System::GetConsoleRegionForDiscRegion(m_disc_region)))
{
stat_byte |= STAT_ID_ERROR;
flags_byte |= (1 << 7); // Unlicensed
}
}
m_async_response_fifo.Clear();

7
src/core/cdrom.h
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@ -210,9 +210,9 @@ private:
void UpdateStatusRegister();
void UpdateInterruptRequest();
TickCount GetAckDelayForCommand(Command command) const;
TickCount GetTicksForRead() const;
TickCount GetTicksForSeek() const;
TickCount GetAckDelayForCommand(Command command);
TickCount GetTicksForRead();
TickCount GetTicksForSeek(CDImage::LBA new_lba);
void BeginCommand(Command command); // also update status register
void EndCommand(); // also updates status register
void AbortCommand();
@ -253,6 +253,7 @@ private:
StatusRegister m_status = {};
SecondaryStatusRegister m_secondary_status = {};
ModeRegister m_mode = {};
bool m_current_double_speed = false;
u8 m_interrupt_enable_register = INTERRUPT_REGISTER_MASK;
u8 m_interrupt_flag_register = 0;

2
src/core/save_state_version.h
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@ -2,4 +2,4 @@
#include "types.h"
static constexpr u32 SAVE_STATE_MAGIC = 0x43435544;
static constexpr u32 SAVE_STATE_VERSION = 21;
static constexpr u32 SAVE_STATE_VERSION = 22;

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