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SPU: Refactor volume envelopes 

Properly handle phase inversion. Fixes left channel audio in Wipeout 3.
This commit is contained in:
Stenzek 2024-08-19 01:38:28 +10:00
parent a9e327b282
commit 0a05c08a2d
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2 changed files with 153 additions and 102 deletions
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2
src/core/save_state_version.h
View File

@ -6,7 +6,7 @@
#include "common/types.h"
static constexpr u32 SAVE_STATE_MAGIC = 0x43435544;
static constexpr u32 SAVE_STATE_VERSION = 69;
static constexpr u32 SAVE_STATE_VERSION = 70;
static constexpr u32 SAVE_STATE_MINIMUM_VERSION = 42;
static_assert(SAVE_STATE_VERSION >= SAVE_STATE_MINIMUM_VERSION);

253
src/core/spu.cpp
View File

@ -57,11 +57,6 @@ enum : u32
NUM_REVERB_REGS = 32,
FIFO_SIZE_IN_HALFWORDS = 32
};
enum : s16
{
ENVELOPE_MIN_VOLUME = 0,
ENVELOPE_MAX_VOLUME = 0x7FFF
};
enum : TickCount
{
TRANSFER_TICKS_PER_HALFWORD = 16
@ -211,21 +206,26 @@ struct ADPCMBlock
struct VolumeEnvelope
{
s32 counter;
static constexpr s32 MIN_VOLUME = -32768;
static constexpr s32 MAX_VOLUME = 32767;
u32 counter;
u16 counter_increment;
s16 step;
u8 rate;
bool decreasing;
bool exponential;
bool phase_invert;
void Reset(u8 rate_, bool decreasing_, bool exponential_, bool phase_invert_);
s16 Tick(s16 current_level);
void Reset(u8 rate_, u8 rate_mask_, bool decreasing_, bool exponential_, bool phase_invert_);
bool Tick(s16& current_level);
};
struct VolumeSweep
{
VolumeEnvelope envelope;
bool envelope_active;
s16 current_level;
bool envelope_active;
void Reset(VolumeRegister reg);
void Tick();
@ -314,15 +314,18 @@ struct ReverbRegisters
};
} // namespace
template<bool COMPATIBILITY>
static bool DoCompatibleState(StateWrapper& sw);
static ADSRPhase GetNextADSRPhase(ADSRPhase phase);
bool IsVoiceReverbEnabled(u32 i);
bool IsVoiceNoiseEnabled(u32 i);
bool IsPitchModulationEnabled(u32 i);
s16 GetVoiceNoiseLevel();
static bool IsVoiceReverbEnabled(u32 i);
static bool IsVoiceNoiseEnabled(u32 i);
static bool IsPitchModulationEnabled(u32 i);
static s16 GetVoiceNoiseLevel();
u16 ReadVoiceRegister(u32 offset);
void WriteVoiceRegister(u32 offset, u16 value);
static u16 ReadVoiceRegister(u32 offset);
static void WriteVoiceRegister(u32 offset, u16 value);
static bool IsRAMIRQTriggerable();
static bool CheckRAMIRQ(u32 address);
@ -561,7 +564,7 @@ void SPU::Reset()
v.is_first_block = 0;
v.current_block_samples.fill(s16(0));
v.adpcm_last_samples.fill(s32(0));
v.adsr_envelope.Reset(0, false, false, false);
v.adsr_envelope.Reset(0, 0, false, false, false);
v.adsr_phase = ADSRPhase::Off;
v.adsr_target = 0;
v.has_samples = false;
@ -575,8 +578,58 @@ void SPU::Reset()
UpdateEventInterval();
}
bool SPU::DoState(StateWrapper& sw)
template<bool COMPATIBILITY>
bool SPU::DoCompatibleState(StateWrapper& sw)
{
struct OldEnvelope
{
s32 counter;
u8 rate;
bool decreasing;
bool exponential;
bool phase_invert;
};
struct OldSweep
{
OldEnvelope env;
bool envelope_active;
s16 current_level;
};
static constexpr const auto do_compatible_volume_envelope = [](StateWrapper& sw, VolumeEnvelope* env) {
if constexpr (COMPATIBILITY)
{
if (sw.GetVersion() < 70) [[unlikely]]
{
OldEnvelope oenv;
sw.DoPOD(&oenv);
env->Reset(oenv.rate, 0x7f, oenv.decreasing, oenv.exponential, oenv.phase_invert);
env->counter = oenv.counter; // wrong
return;
}
}
sw.DoPOD(env);
};
static constexpr const auto do_compatible_volume_sweep = [](StateWrapper& sw, VolumeSweep* sweep) {
if constexpr (COMPATIBILITY)
{
if (sw.GetVersion() < 70) [[unlikely]]
{
OldSweep osweep;
sw.DoPOD(&osweep);
sweep->envelope.Reset(osweep.env.rate, 0x7f, osweep.env.decreasing, osweep.env.exponential,
osweep.env.phase_invert);
sweep->envelope.counter = osweep.env.counter; // wrong
sweep->envelope_active = osweep.envelope_active;
sweep->current_level = osweep.current_level;
return;
}
}
sw.DoPOD(sweep);
};
sw.Do(&s_state.ticks_carry);
sw.Do(&s_state.SPUCNT.bits);
sw.Do(&s_state.SPUSTAT.bits);
@ -587,8 +640,8 @@ bool SPU::DoState(StateWrapper& sw)
sw.Do(&s_state.capture_buffer_position);
sw.Do(&s_state.main_volume_left_reg.bits);
sw.Do(&s_state.main_volume_right_reg.bits);
sw.DoPOD(&s_state.main_volume_left);
sw.DoPOD(&s_state.main_volume_right);
do_compatible_volume_sweep(sw, &s_state.main_volume_left);
do_compatible_volume_sweep(sw, &s_state.main_volume_right);
sw.Do(&s_state.cd_audio_volume_left);
sw.Do(&s_state.cd_audio_volume_right);
sw.Do(&s_state.external_volume_left);
@ -619,14 +672,17 @@ bool SPU::DoState(StateWrapper& sw)
sw.DoArray(v.regs.index, NUM_VOICE_REGISTERS);
sw.Do(&v.counter.bits);
sw.Do(&v.current_block_flags.bits);
sw.DoEx(&v.is_first_block, 47, false);
if constexpr (COMPATIBILITY)
sw.DoEx(&v.is_first_block, 47, false);
else
sw.Do(&v.is_first_block);
sw.DoArray(&v.current_block_samples[NUM_SAMPLES_FROM_LAST_ADPCM_BLOCK], NUM_SAMPLES_PER_ADPCM_BLOCK);
sw.DoArray(&v.current_block_samples[0], NUM_SAMPLES_FROM_LAST_ADPCM_BLOCK);
sw.Do(&v.adpcm_last_samples);
sw.Do(&v.last_volume);
sw.DoPOD(&v.left_volume);
sw.DoPOD(&v.right_volume);
sw.DoPOD(&v.adsr_envelope);
do_compatible_volume_sweep(sw, &v.left_volume);
do_compatible_volume_sweep(sw, &v.right_volume);
do_compatible_volume_envelope(sw, &v.adsr_envelope);
sw.Do(&v.adsr_phase);
sw.Do(&v.adsr_target);
sw.Do(&v.has_samples);
@ -645,6 +701,14 @@ bool SPU::DoState(StateWrapper& sw)
return !sw.HasError();
}
bool SPU::DoState(StateWrapper& sw)
{
if (sw.GetVersion() < 70) [[unlikely]]
return DoCompatibleState<true>(sw);
else
return DoCompatibleState<false>(sw);
}
u16 SPU::ReadRegister(u32 offset)
{
switch (offset)
@ -1620,71 +1684,45 @@ SPU::ADSRPhase SPU::GetNextADSRPhase(ADSRPhase phase)
}
}
struct ADSRTableEntry
{
s32 ticks;
s32 step;
};
enum : u32
{
NUM_ADSR_TABLE_ENTRIES = 128,
NUM_ADSR_DIRECTIONS = 2 // increasing, decreasing
};
using ADSRTableEntries = std::array<std::array<ADSRTableEntry, NUM_ADSR_TABLE_ENTRIES>, NUM_ADSR_DIRECTIONS>;
static constexpr ADSRTableEntries ComputeADSRTableEntries()
{
ADSRTableEntries entries = {};
for (u32 decreasing = 0; decreasing < 2; decreasing++)
{
for (u32 rate = 0; rate < NUM_ADSR_TABLE_ENTRIES; rate++)
{
if (rate < 44)
{
entries[decreasing][rate].ticks = 1;
if (decreasing != 0)
entries[decreasing][rate].step =
static_cast<s32>(static_cast<u32>(-8 + static_cast<s32>(rate & 3)) << (11 - (rate >> 2)));
else
entries[decreasing][rate].step = (7 - static_cast<s32>(rate & 3)) << (11 - (rate >> 2));
}
else
{
entries[decreasing][rate].ticks = 1 << (static_cast<s32>(rate >> 2) - 11);
if (decreasing != 0)
entries[decreasing][rate].step = (-8 + static_cast<s32>(rate & 3));
else
entries[decreasing][rate].step = (7 - static_cast<s32>(rate & 3));
}
}
}
return entries;
}
static constexpr ADSRTableEntries s_adsr_table = ComputeADSRTableEntries();
void SPU::VolumeEnvelope::Reset(u8 rate_, bool decreasing_, bool exponential_, bool phase_invert_)
void SPU::VolumeEnvelope::Reset(u8 rate_, u8 rate_mask_, bool decreasing_, bool exponential_, bool phase_invert_)
{
rate = rate_;
decreasing = decreasing_;
exponential = exponential_;
phase_invert = phase_invert_;
const ADSRTableEntry& table_entry = s_adsr_table[BoolToUInt8(decreasing)][rate];
counter = table_entry.ticks;
// psx-spx says "The Phase bit seems to have no effect in Exponential Decrease mode."
// TODO: This needs to be tested on hardware.
phase_invert = phase_invert_ && !(decreasing_ && exponential_);
counter = 0;
counter_increment = 0x8000;
// negative level * negative step would give a positive number in decreasing+exponential mode, when we want it to be
// negative. Phase invert cause the step to be positive in decreasing mode, otherwise negative. Bitwise NOT, so that
// +7,+6,+5,+4 becomes -8,-7,-6,-5 as per psx-spx.
const s16 base_step = 7 - (rate & 3);
step = ((decreasing_ ^ phase_invert_) | (decreasing_ & exponential_)) ? ~base_step : base_step;
if (rate < 44)
{
// AdsrStep = StepValue SHL Max(0,11-ShiftValue)
step <<= (11 - (rate >> 2));
}
else if (rate >= 48)
{
// AdsrCycles = 1 SHL Max(0,ShiftValue-11)
counter_increment >>= ((rate >> 2) - 11);
// Rate of 0x7F (or more specifically all bits set, for decay/release) is a special case that never ticks.
if ((rate_ & rate_mask_) != rate_mask_)
counter_increment = std::max<u16>(counter_increment, 1u);
}
}
s16 SPU::VolumeEnvelope::Tick(s16 current_level)
ALWAYS_INLINE_RELEASE bool SPU::VolumeEnvelope::Tick(s16& current_level)
{
counter--;
if (counter > 0)
return current_level;
const ADSRTableEntry& table_entry = s_adsr_table[BoolToUInt8(decreasing)][rate];
s32 this_step = table_entry.step;
counter = table_entry.ticks;
// Recompute step in exponential/decrement mode.
u32 this_increment = counter_increment;
s32 this_step = step;
if (exponential)
{
if (decreasing)
@ -1701,26 +1739,41 @@ s16 SPU::VolumeEnvelope::Tick(s16 current_level)
}
else if (rate >= 44)
{
counter >>= 2;
this_increment >>= 2;
}
else
{
this_step >>= 1;
counter >>= 1;
this_increment >>= 1;
}
}
}
}
if (phase_invert) [[unlikely]]
counter += this_increment;
// Very strange behavior. Rate of 0x76 behaves like 0x6A, seems it's dependent on the MSB=1.
if (!(counter & 0x8000))
return true;
counter = 0;
// Phase invert acts very strange. If the volume is positive, it will decrease to zero, then increase back to maximum
// negative (inverted) volume. Except when decrementing, then it snaps straight to zero. Simply clamping to int16
// range will be fine for incrementing, because the volume never decreases past zero. If the volume _was_ negative,
// and is incrementing, hardware tests show that it only clamps to max, not 0.
s32 new_level = current_level + this_step;
if (!decreasing)
{
return static_cast<s16>(
std::clamp<s32>(static_cast<s32>(current_level) - this_step, -ENVELOPE_MAX_VOLUME, ENVELOPE_MIN_VOLUME));
current_level = Truncate16(new_level = std::clamp(new_level, MIN_VOLUME, MAX_VOLUME));
return (new_level != ((this_step < 0) ? MIN_VOLUME : MAX_VOLUME));
}
else
{
return static_cast<s16>(
std::clamp<s32>(static_cast<s32>(current_level) + this_step, ENVELOPE_MIN_VOLUME, ENVELOPE_MAX_VOLUME));
if (phase_invert)
current_level = Truncate16(new_level = std::clamp(new_level, MIN_VOLUME, 0));
else
current_level = Truncate16(new_level = std::max(new_level, 0));
return (new_level == 0);
}
}
@ -1733,9 +1786,8 @@ void SPU::VolumeSweep::Reset(VolumeRegister reg)
return;
}
envelope.Reset(reg.sweep_rate, reg.sweep_direction_decrease, reg.sweep_exponential,
!(reg.sweep_exponential && reg.sweep_direction_decrease) && reg.sweep_phase_negative);
envelope_active = true;
envelope.Reset(reg.sweep_rate, 0x7F, reg.sweep_direction_decrease, reg.sweep_exponential, reg.sweep_phase_negative);
envelope_active = (envelope.counter_increment > 0);
}
void SPU::VolumeSweep::Tick()
@ -1743,9 +1795,7 @@ void SPU::VolumeSweep::Tick()
if (!envelope_active)
return;
current_level = envelope.Tick(current_level);
envelope_active =
(envelope.decreasing ? (current_level > ENVELOPE_MIN_VOLUME) : (current_level < ENVELOPE_MAX_VOLUME));
envelope_active = envelope.Tick(current_level);
}
void SPU::Voice::UpdateADSREnvelope()
@ -1754,29 +1804,29 @@ void SPU::Voice::UpdateADSREnvelope()
{
case ADSRPhase::Off:
adsr_target = 0;
adsr_envelope.Reset(0, false, false, false);
adsr_envelope.Reset(0, 0, false, false, false);
return;
case ADSRPhase::Attack:
adsr_target = 32767; // 0 -> max
adsr_envelope.Reset(regs.adsr.attack_rate, false, regs.adsr.attack_exponential, false);
adsr_envelope.Reset(regs.adsr.attack_rate, 0x7F, false, regs.adsr.attack_exponential, false);
break;
case ADSRPhase::Decay:
adsr_target = static_cast<s16>(std::min<s32>((u32(regs.adsr.sustain_level.GetValue()) + 1) * 0x800,
ENVELOPE_MAX_VOLUME)); // max -> sustain level
adsr_envelope.Reset(regs.adsr.decay_rate_shr2 << 2, true, true, false);
VolumeEnvelope::MAX_VOLUME)); // max -> sustain level
adsr_envelope.Reset(regs.adsr.decay_rate_shr2 << 2, 0x1F << 2, true, true, false);
break;
case ADSRPhase::Sustain:
adsr_target = 0;
adsr_envelope.Reset(regs.adsr.sustain_rate, regs.adsr.sustain_direction_decrease, regs.adsr.sustain_exponential,
false);
adsr_envelope.Reset(regs.adsr.sustain_rate, 0x7F, regs.adsr.sustain_direction_decrease,
regs.adsr.sustain_exponential, false);
break;
case ADSRPhase::Release:
adsr_target = 0;
adsr_envelope.Reset(regs.adsr.release_rate_shr2 << 2, true, regs.adsr.release_exponential, false);
adsr_envelope.Reset(regs.adsr.release_rate_shr2 << 2, 0x1F << 2, true, regs.adsr.release_exponential, false);
break;
default:
@ -1786,7 +1836,8 @@ void SPU::Voice::UpdateADSREnvelope()
void SPU::Voice::TickADSR()
{
regs.adsr_volume = adsr_envelope.Tick(regs.adsr_volume);
if (adsr_envelope.counter_increment > 0)
adsr_envelope.Tick(regs.adsr_volume);
if (adsr_phase != ADSRPhase::Sustain)
{