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CDROM: Simulate backwards track jump after seek/pause

This commit is contained in:
Stenzek 2024-11-11 01:29:56 +10:00
parent 5f607d8c7a
commit a2af51b856
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1 changed files with 54 additions and 46 deletions
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94
src/core/cdrom.cpp
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@ -349,7 +349,7 @@ static void StopMotor();
static void BeginSeeking(bool logical, bool read_after_seek, bool play_after_seek);
static void UpdateSubQPositionWhileSeeking();
static void UpdateSubQPosition(bool update_logical);
static void SetHoldPosition(CDImage::LBA lba, bool update_subq);
static void SetHoldPosition(CDImage::LBA lba, CDImage::LBA subq_lba, bool update_subq);
static void ResetCurrentXAFile();
static void ResetAudioDecoder();
static void ClearSectorBuffers();
@ -602,7 +602,7 @@ void CDROM::Reset()
UpdateStatusRegister();
SetHoldPosition(0, true);
SetHoldPosition(0, 0, true);
}
TickCount CDROM::SoftReset(TickCount ticks_late)
@ -916,7 +916,7 @@ bool CDROM::InsertMedia(std::unique_ptr<CDImage> media, DiscRegion region, std::
s_state.subq_replacement = std::move(subq);
s_state.disc_region = region;
s_reader.SetMedia(std::move(media));
SetHoldPosition(0, true);
SetHoldPosition(0, 0, true);
// motor automatically spins up
if (s_state.drive_state != DriveState::ShellOpening)
@ -1571,30 +1571,24 @@ TickCount CDROM::GetTicksForSeek(CDImage::LBA new_lba, bool ignore_speed_change)
ClearDriveState();
}
float seconds;
std::string_view seek_type;
if (lba_diff < 10)
{
seconds = 0.0f;
const TickCount ticks_per_sector =
s_state.mode.double_speed ? (System::MASTER_CLOCK / 150) : (System::MASTER_CLOCK / 75);
if (current_lba < new_lba)
{
// If we're behind the current sector, and within a small distance, the mech just waits for the sector to come up
// by reading normally (or apparently moves the lens according to some?). This timing is actually needed for
// Transformers - Beast Wars Transmetals, it gets very unstable during loading if seeks are too fast.
ticks += ticks_per_sector * std::min(8u, lba_diff);
seek_type = "forward";
}
else
{
// Track jump back. We cap this at 8 sectors (~53ms), so it doesn't take longer than the medium seek below.
const CDImage::LBA sectors_per_track = GetSectorsPerTrack(current_lba);
const CDImage::LBA tjump_position = (current_lba >= sectors_per_track) ? (current_lba - sectors_per_track) : 0;
ticks += ticks_per_sector * std::clamp((new_lba - std::min(new_lba, tjump_position)), 1u, 8u);
seek_type = "1T back+forward";
std::string_view seek_type;
if (current_lba < new_lba && lba_diff <= sectors_per_track)
{
// If we're behind the current sector, and within a small distance, the mech just waits for the sector to come up
// by reading normally. This timing is actually needed for Transformers - Beast Wars Transmetals, it gets very
// unstable during loading if seeks are too fast.
ticks += ticks_per_sector * std::max(lba_diff, 1u);
seek_type = "forward";
}
else if (current_lba > new_lba && tjump_position <= new_lba)
{
// Track jump back. We cap this at 8 sectors (~53ms), so it doesn't take longer than the medium seek below.
ticks += ticks_per_sector * std::max(new_lba - tjump_position, 1u);
seek_type = "1T back+forward";
}
else if (lba_diff < 7200)
{
@ -1604,7 +1598,8 @@ TickCount CDROM::GetTicksForSeek(CDImage::LBA new_lba, bool ignore_speed_change)
330.0f +
(-63.1333f * std::log(std::clamp(static_cast<float>(current_lba) / static_cast<float>(CDImage::FRAMES_PER_MINUTE),
1.0f, 72.0f))));
seconds = (lba_diff < switch_point) ? 0.05f : 0.1f;
const float seconds = (lba_diff < switch_point) ? 0.05f : 0.1f;
ticks += static_cast<u32>(seconds * static_cast<float>(System::MASTER_CLOCK));
seek_type = (new_lba > current_lba) ? "NT forward" : "NT backward";
}
else
@ -1615,16 +1610,14 @@ TickCount CDROM::GetTicksForSeek(CDImage::LBA new_lba, bool ignore_speed_change)
constexpr float SLED_VARIABLE_COST = 0.9f - SLED_FIXED_COST;
constexpr float LOG_WEIGHT = 0.4f;
constexpr float MAX_SLED_LBA = static_cast<float>(72 * CDImage::FRAMES_PER_MINUTE);
seconds =
const float seconds =
SLED_FIXED_COST +
(((SLED_VARIABLE_COST * (std::log(static_cast<float>(lba_diff)) / std::log(MAX_SLED_LBA)))) * LOG_WEIGHT) +
((SLED_VARIABLE_COST * (lba_diff / MAX_SLED_LBA)) * (1.0f - LOG_WEIGHT));
ticks += static_cast<u32>(seconds * static_cast<float>(System::MASTER_CLOCK));
seek_type = (new_lba > current_lba) ? "2N/sled forward" : "2N/sled backward";
}
constexpr u32 ticks_per_second = static_cast<u32>(System::MASTER_CLOCK);
ticks += static_cast<u32>(seconds * static_cast<float>(ticks_per_second));
if (g_settings.cdrom_seek_speedup > 1)
ticks = std::max<u32>(ticks / g_settings.cdrom_seek_speedup, MIN_TICKS);
@ -1636,13 +1629,14 @@ TickCount CDROM::GetTicksForSeek(CDImage::LBA new_lba, bool ignore_speed_change)
DEV_LOG("Seek time for {}->{} ({} LBA): {} ({:.3f} ms) ({} for speed change/init) ({})",
LBAToMSFString(current_lba), LBAToMSFString(new_lba), lba_diff, ticks,
(static_cast<float>(ticks) / static_cast<float>(ticks_per_second)) * 1000.0f, remaining_change_ticks,
(static_cast<float>(ticks) / static_cast<float>(System::MASTER_CLOCK)) * 1000.0f, remaining_change_ticks,
seek_type);
}
else
{
DEV_LOG("Seek time for {}->{} ({} LBA): {} ({:.3f} ms) ({})", LBAToMSFString(current_lba), LBAToMSFString(new_lba),
lba_diff, ticks, (static_cast<float>(ticks) / static_cast<float>(ticks_per_second)) * 1000.0f, seek_type);
lba_diff, ticks, (static_cast<float>(ticks) / static_cast<float>(System::MASTER_CLOCK)) * 1000.0f,
seek_type);
}
return System::ScaleTicksToOverclock(static_cast<TickCount>(ticks));
@ -1819,7 +1813,7 @@ void CDROM::ExecuteCommand(void*, TickCount ticks, TickCount ticks_late)
else
{
SendACKAndStat();
SetHoldPosition(0, true);
SetHoldPosition(0, 0, true);
QueueCommandSecondResponse(Command::ReadTOC, GetTicksForTOCRead());
}
@ -2083,9 +2077,13 @@ void CDROM::ExecuteCommand(void*, TickCount ticks, TickCount ticks_late)
else
DEV_COLOR_LOG(StrongRed, "Pause Not Reading");
const bool was_reading =
(s_state.drive_state == DriveState::Reading || s_state.drive_state == DriveState::Playing);
const TickCount pause_time = was_reading ? (s_state.mode.double_speed ? 2000000 : 1000000) : 7000;
const TickCount pause_time = IsReadingOrPlaying() ? (s_state.mode.double_speed ? 2000000 : 1000000) : 7000;
if (s_state.drive_state == DriveState::Reading && s_state.last_subq.IsData())
{
// Hit target, immediately jump back in data mode.
const u32 spt = GetSectorsPerTrack(s_state.current_lba);
SetHoldPosition(s_state.current_lba, (spt <= s_state.current_lba) ? (s_state.current_lba - spt) : 0, true);
}
ClearCommandSecondResponse();
SendACKAndStat();
@ -2833,7 +2831,7 @@ void CDROM::UpdateSubQPosition(bool update_logical)
{
WARNING_LOG("Jumping to hold position [{}->{}] while {} first sector", s_state.current_subq_lba,
s_state.current_lba, (s_state.drive_state == DriveState::Reading) ? "reading" : "playing");
SetHoldPosition(s_state.current_lba, true);
SetHoldPosition(s_state.current_lba, s_state.current_lba, true);
}
// Otherwise, this gets updated by the read event.
@ -2885,21 +2883,21 @@ void CDROM::UpdateSubQPosition(bool update_logical)
}
}
void CDROM::SetHoldPosition(CDImage::LBA lba, bool update_subq)
void CDROM::SetHoldPosition(CDImage::LBA lba, CDImage::LBA subq_lba, bool update_subq)
{
if (update_subq && s_state.current_subq_lba != lba && CanReadMedia())
if (update_subq && s_state.current_subq_lba != subq_lba && CanReadMedia())
{
CDImage::SubChannelQ real_subq = {};
if (!s_reader.ReadSectorUncached(lba, &real_subq, nullptr))
if (!s_reader.ReadSectorUncached(subq_lba, &real_subq, nullptr))
ERROR_LOG("Failed to read subq for sector {} for subq position", lba);
const CDImage::SubChannelQ& subq = GetSectorSubQ(lba, real_subq);
const CDImage::SubChannelQ& subq = GetSectorSubQ(subq_lba, real_subq);
if (subq.IsCRCValid())
s_state.last_subq = subq;
}
s_state.current_lba = lba;
s_state.current_subq_lba = lba;
s_state.current_subq_lba = subq_lba;
s_state.subq_lba_update_tick = System::GetGlobalTickCounter();
s_state.subq_lba_update_carry = 0;
}
@ -2919,6 +2917,11 @@ bool CDROM::CompleteSeek()
ClearDriveState();
bool seek_okay = s_reader.WaitForReadToComplete();
s_state.current_subq_lba = s_reader.GetLastReadSector();
s_state.subq_lba_update_tick = System::GetGlobalTickCounter();
s_state.subq_lba_update_carry = 0;
if (seek_okay)
{
const CDImage::SubChannelQ& subq = GetSectorSubQ(s_reader.GetLastReadSector(), s_reader.GetSectorSubQ());
@ -2938,6 +2941,14 @@ bool CDROM::CompleteSeek()
ProcessDataSectorHeader(s_reader.GetSectorBuffer().data());
seek_okay = (s_state.last_sector_header.minute == seek_mm && s_state.last_sector_header.second == seek_ss &&
s_state.last_sector_header.frame == seek_ff);
if (seek_okay)
{
// after reading the target, the mech immediately does a 1T reverse
const u32 spt = GetSectorsPerTrack(s_state.current_subq_lba);
SetHoldPosition(s_state.current_subq_lba,
(spt <= s_state.current_subq_lba) ? (s_state.current_subq_lba - spt) : 0, true);
}
}
}
else
@ -2967,9 +2978,6 @@ bool CDROM::CompleteSeek()
s_state.current_lba = s_reader.GetLastReadSector();
}
s_state.current_subq_lba = s_state.current_lba;
s_state.subq_lba_update_tick = System::GetGlobalTickCounter();
s_state.subq_lba_update_carry = 0;
return seek_okay;
}
@ -3136,7 +3144,7 @@ void CDROM::StopMotor()
s_state.secondary_status.ClearActiveBits();
s_state.secondary_status.motor_on = false;
ClearDriveState();
SetHoldPosition(0, false);
SetHoldPosition(0, 0, false);
s_state.last_sector_header_valid = false; // TODO: correct?
}