aiden
/
duckstation
mirror of https://github.com/stenzek/duckstation
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

CDROM: Add timing for speed changes/adjust seek timing

Browse Source 
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

49
src/core/cdrom.cpp
Unescape Escape View File

@ -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);
}
@ -1394,13 +1406,20 @@ void CDROM::DoIDRead()
{
flags_byte |= (1 << 6); // Disc Missing
}
else if (m_system->GetSettings().cdrom_region_check &&
else
{
// 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();
m_async_response_fifo.Push(stat_byte);

7
src/core/cdrom.h
Unescape Escape View File

@ -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
Unescape Escape View File

@ -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;

Write Preview
Loading…
Cancel
Save