// license:BSD-3-Clause
// copyright-holders:Miguel Angel Horna
/*
* Yamaha YMW-258-F 'GEW8' (aka Sega 315-5560) emulation.
*
* by Miguel Angel Horna (ElSemi) for Model 2 Emulator and MAME.
* Information by R. Belmont and the YMF278B (OPL4) manual.
*
* voice registers:
* 0: Pan
* 1: Index of sample
* 2: LSB of pitch (low 2 bits seem unused so)
* 3: MSB of pitch (ooooppppppppppxx) (o=octave (4 bit signed), p=pitch (10 bits), x=unused?
* 4: voice control: top bit = 1 for key on, 0 for key off
* 5: bit 0: 0: interpolate volume changes, 1: direct set volume,
bits 1-7 = volume attenuate (0=max, 7f=min)
* 6: LFO frequency + Phase LFO depth
* 7: Amplitude LFO size
*
* The first sample ROM contains a variable length metadata table with 12
* bytes per instrument sample. This is very similar to the YMF278B 'OPL4'.
* This sample format might be derived from the one used by the older YM7138 'GEW6' chip.
*
* The first 3 bytes are the offset into the file (big endian). (0, 1, 2)
* The next 2 are the loop start point, in samples (big endian) (3, 4)
* The next 2 are the 2's complement negation of of the total number of samples (big endian) (5, 6)
* The next byte is LFO freq + depth (copied to reg 6 ?) (7, 8)
* The next 3 are envelope params (Attack, Decay1 and 2, sustain level, release, Key Rate Scaling) (9, 10, 11)
* The next byte is Amplitude LFO size (copied to reg 7 ?)
*
* TODO
* - http://dtech.lv/techarticles_yamaha_chips.html indicates FM and 12-bit sample support,
* which we don't have yet.
*/
#include "emu.h"
#include "multipcm.h"
#include "wavwrite.h"
ALLOW_SAVE_TYPE(multipcm_device::state_t); // allow save_item on a non-fundamental type
/*******************************
ENVELOPE SECTION
*******************************/
//Times are based on a 44100Hz timebase. It's adjusted to the actual sampling rate on startup
const double multipcm_device::BASE_TIMES[64] = {
0, 0, 0, 0,
6222.95, 4978.37, 4148.66, 3556.01,
3111.47, 2489.21, 2074.33, 1778.00,
1555.74, 1244.63, 1037.19, 889.02,
777.87, 622.31, 518.59, 444.54,
388.93, 311.16, 259.32, 222.27,
194.47, 155.60, 129.66, 111.16,
97.23, 77.82, 64.85, 55.60,
48.62, 38.91, 32.43, 27.80,
24.31, 19.46, 16.24, 13.92,
12.15, 9.75, 8.12, 6.98,
6.08, 4.90, 4.08, 3.49,
3.04, 2.49, 2.13, 1.90,
1.72, 1.41, 1.18, 1.04,
0.91, 0.73, 0.59, 0.50,
0.45, 0.45, 0.45, 0.45
};
const int32_t multipcm_device::VALUE_TO_CHANNEL[32] =
{
0, 1, 2, 3, 4, 5, 6 , -1,
7, 8, 9, 10,11,12,13, -1,
14,15,16,17,18,19,20, -1,
21,22,23,24,25,26,27, -1,
};
constexpr uint32_t multipcm_device::TL_SHIFT;
constexpr uint32_t multipcm_device::EG_SHIFT;
void multipcm_device::init_sample(sample_t *sample, uint32_t index)
{
uint32_t address = index * 12;
sample->m_start = (read_byte(address) << 16) | (read_byte(address + 1) << 8) | read_byte(address + 2);
sample->m_start &= 0x3fffff;
sample->m_loop = (read_byte(address + 3) << 8) | read_byte(address + 4);
sample->m_end = 0xffff - ((read_byte(address + 5) << 8) | read_byte(address + 6));
sample->m_attack_reg = (read_byte(address + 8) >> 4) & 0xf;
sample->m_decay1_reg = read_byte(address + 8) & 0xf;
sample->m_decay2_reg = read_byte(address + 9) & 0xf;
sample->m_decay_level = (read_byte(address + 9) >> 4) & 0xf;
sample->m_release_reg = read_byte(address + 10) & 0xf;
sample->m_key_rate_scale = (read_byte(address + 10) >> 4) & 0xf;
sample->m_lfo_vibrato_reg = read_byte(address + 7);
sample->m_lfo_amplitude_reg = read_byte(address + 11) & 0xf;
}
int32_t multipcm_device::envelope_generator_update(slot_t &slot)
{
switch(slot.m_envelope_gen.m_state)
{
case state_t::ATTACK:
slot.m_envelope_gen.m_volume += slot.m_envelope_gen.m_attack_rate;
if (slot.m_envelope_gen.m_volume >= (0x3ff << EG_SHIFT))
{
slot.m_envelope_gen.m_state = state_t::DECAY1;
if (slot.m_envelope_gen.m_decay1_rate >= (0x400 << EG_SHIFT)) //Skip DECAY1, go directly to DECAY2
{
slot.m_envelope_gen.m_state = state_t::DECAY2;
}
slot.m_envelope_gen.m_volume = 0x3ff << EG_SHIFT;
}
break;
case state_t::DECAY1:
slot.m_envelope_gen.m_volume -= slot.m_envelope_gen.m_decay1_rate;
if (slot.m_envelope_gen.m_volume <= 0)
{
slot.m_envelope_gen.m_volume = 0;
}
if (slot.m_envelope_gen.m_volume >> EG_SHIFT <= (slot.m_envelope_gen.m_decay_level << 6))
{
slot.m_envelope_gen.m_state = state_t::DECAY2;
}
break;
case state_t::DECAY2:
slot.m_envelope_gen.m_volume -= slot.m_envelope_gen.m_decay2_rate;
if (slot.m_envelope_gen.m_volume <= 0)
{
slot.m_envelope_gen.m_volume = 0;
}
break;
case state_t::RELEASE:
slot.m_envelope_gen.m_volume -= slot.m_envelope_gen.m_release_rate;
if (slot.m_envelope_gen.m_volume <= 0)
{
slot.m_envelope_gen.m_volume = 0;
slot.m_playing = false;
}
break;
default:
return 1 << TL_SHIFT;
}
return m_linear_to_exp_volume[slot.m_envelope_gen.m_volume >> EG_SHIFT];
}
uint32_t multipcm_device::get_rate(uint32_t *steps, uint32_t rate, uint32_t val)
{
int32_t r = 4 * val + rate;
if (val == 0)
{
return steps[0];
}
if (val == 0xf)
{
return steps[0x3f];
}
if (r > 0x3f)
{
r = 0x3f;
}
return steps[r];
}
void multipcm_device::envelope_generator_calc(slot_t &slot)
{
int32_t octave = ((slot.m_regs[3] >> 4) - 1) & 0xf;
if (octave & 8) {
octave = octave - 16;
}
int32_t rate;
if (slot.m_sample.m_key_rate_scale != 0xf)
{
rate = (octave + slot.m_sample.m_key_rate_scale) * 2 + ((slot.m_regs[3] >> 3) & 1);
}
else
{
rate = 0;
}
slot.m_envelope_gen.m_attack_rate = get_rate(m_attack_step.get(), rate, slot.m_sample.m_attack_reg);
slot.m_envelope_gen.m_decay1_rate = get_rate(m_decay_release_step.get(), rate, slot.m_sample.m_decay1_reg);
slot.m_envelope_gen.m_decay2_rate = get_rate(m_decay_release_step.get(), rate, slot.m_sample.m_decay2_reg);
slot.m_envelope_gen.m_release_rate = get_rate(m_decay_release_step.get(), rate, slot.m_sample.m_release_reg);
slot.m_envelope_gen.m_decay_level = 0xf - slot.m_sample.m_decay_level;
}
/*****************************
LFO SECTION
*****************************/
constexpr uint32_t multipcm_device::LFO_SHIFT;
const float multipcm_device::LFO_FREQ[8] = // In Hertz
{
0.168f,
2.019f,
3.196f,
4.206f,
5.215f,
5.888f,
6.224f,
7.066f
};
const float multipcm_device::PHASE_SCALE_LIMIT[8] = // In Cents
{
0.0f,
3.378f,
5.065f,
6.750f,
10.114f,
20.170f,
40.180f,
79.307f
};
const float multipcm_device::AMPLITUDE_SCALE_LIMIT[8] = // In Decibels
{
0.0f,
0.4f,
0.8f,
1.5f,
3.0f,
6.0f,
12.0f,
24.0f
};
void multipcm_device::lfo_init()
{
m_pitch_table = make_unique_clear<int32_t[]>(256);
m_amplitude_table = make_unique_clear<int32_t[]>(256);
for (int32_t i = 0; i < 256; ++i)
{
if (i < 64)
{
m_pitch_table[i] = i * 2 + 128;
}
else if (i < 128)
{
m_pitch_table[i] = 383 - i * 2;
}
else if (i < 192)
{
m_pitch_table[i] = 384 - i * 2;
}
else
{
m_pitch_table[i] = i * 2 - 383;
}
if (i < 128)
{
m_amplitude_table[i] = 255 - (i * 2);
}
else
{
m_amplitude_table[i] = (i * 2) - 256;
}
}
for (int32_t table = 0; table < 8; ++table)
{
float limit = PHASE_SCALE_LIMIT[table];
m_pitch_scale_tables[table] = make_unique_clear<int32_t[]>(256);
for(int32_t i = -128; i < 128; ++i)
{
const float value = (limit * (float)i) / 128.0f;
const float converted = powf(2.0f, value / 1200.0f);
m_pitch_scale_tables[table][i + 128] = value_to_fixed(LFO_SHIFT, converted);
}
limit = -AMPLITUDE_SCALE_LIMIT[table];
m_amplitude_scale_tables[table] = make_unique_clear<int32_t[]>(256);
for(int32_t i = 0; i < 256; ++i)
{
const float value = (limit * (float)i) / 256.0f;
const float converted = powf(10.0f, value / 20.0f);
m_amplitude_scale_tables[table][i] = value_to_fixed(LFO_SHIFT, converted);
}
}
}
uint32_t multipcm_device::value_to_fixed(const uint32_t bits, const float value)
{
const float float_shift = float(1 << bits);
return uint32_t(float_shift * value);
}
int32_t multipcm_device::pitch_lfo_step(lfo_t &lfo)
{
lfo.m_phase += lfo.m_phase_step;
int32_t p = lfo.m_table[(lfo.m_phase >> LFO_SHIFT) & 0xff];
p = lfo.m_scale[p];
return p << (TL_SHIFT - LFO_SHIFT);
}
int32_t multipcm_device::amplitude_lfo_step(lfo_t &lfo)
{
lfo.m_phase += lfo.m_phase_step;
int32_t p = lfo.m_table[(lfo.m_phase >> LFO_SHIFT) & 0xff];
p = lfo.m_scale[p];
return p << (TL_SHIFT - LFO_SHIFT);
}
void multipcm_device::lfo_compute_step(lfo_t &lfo, uint32_t lfo_frequency, uint32_t lfo_scale, int32_t amplitude_lfo)
{
float step = (float)LFO_FREQ[lfo_frequency] * 256.0f / (float)m_rate;
lfo.m_phase_step = uint32_t(float(1 << LFO_SHIFT) * step);
if (amplitude_lfo)
{
lfo.m_table = m_amplitude_table.get();
lfo.m_scale = m_amplitude_scale_tables[lfo_scale].get();
}
else
{
lfo.m_table = m_pitch_table.get();
lfo.m_scale = m_pitch_scale_tables[lfo_scale].get();
}
}
void multipcm_device::write_slot(slot_t &slot, int32_t reg, uint8_t data)
{
slot.m_regs[reg] = data;
switch(reg)
{
case 0: // PANPOT
slot.m_pan = (data >> 4) & 0xf;
break;
case 1: // Sample
{
//according to YMF278 sample write causes some base params written to the regs (envelope+lfos)
//the game should never change the sample while playing.
sample_t sample;
init_sample(&sample, slot.m_regs[1] | ((slot.m_regs[2] & 1) << 8));
write_slot(slot, 6, sample.m_lfo_vibrato_reg);
write_slot(slot, 7, sample.m_lfo_amplitude_reg);
break;
}
case 2: //Pitch
case 3:
{
uint32_t oct = ((slot.m_regs[3] >> 4) - 1) & 0xf;
uint32_t pitch = ((slot.m_regs[3] & 0xf) << 6) | (slot.m_regs[2] >> 2);
pitch = m_freq_step_table[pitch];
if (oct & 0x8)
{
pitch >>= (16 - oct);
}
else
{
pitch <<= oct;
}
slot.m_step = pitch / m_rate;
}
break;
case 4: //KeyOn/Off (and more?)
if (data & 0x80) //KeyOn
{
init_sample(&slot.m_sample, slot.m_regs[1] | ((slot.m_regs[2] & 1) << 8));
slot.m_playing = true;
slot.m_base = slot.m_sample.m_start;
slot.m_offset = 0;
slot.m_prev_sample = 0;
slot.m_total_level = slot.m_dest_total_level << TL_SHIFT;
envelope_generator_calc(slot);
slot.m_envelope_gen.m_state = state_t::ATTACK;
slot.m_envelope_gen.m_volume = 0;
#if MULTIPCM_LOG_SAMPLES
dump_sample(slot);
#endif
}
else
{
if (slot.m_playing)
{
if (slot.m_sample.m_release_reg != 0xf)
{
slot.m_envelope_gen.m_state = state_t::RELEASE;
}
else
{
slot.m_playing = false;
}
}
}
break;
case 5: // TL + Interpolation
slot.m_dest_total_level = (data >> 1) & 0x7f;
if (!(data & 1)) //Interpolate TL
{
if ((slot.m_total_level >> TL_SHIFT) > slot.m_dest_total_level)
{
slot.m_total_level_step = m_total_level_steps[0]; // decrease
}
else
{
slot.m_total_level_step = m_total_level_steps[1]; // increase
}
}
else
{
slot.m_total_level = slot.m_dest_total_level << TL_SHIFT;
}
break;
case 6: // LFO frequency + Pitch LFO
if (data)
{
lfo_compute_step(slot.m_pitch_lfo, (slot.m_regs[6] >> 3) & 7, slot.m_regs[6] & 7, 0);
lfo_compute_step(slot.m_amplitude_lfo, (slot.m_regs[6] >> 3) & 7, slot.m_regs[7] & 7, 1);
}
break;
case 7: // Amplitude LFO
if (data)
{
lfo_compute_step(slot.m_pitch_lfo, (slot.m_regs[6] >> 3) & 7, slot.m_regs[6] & 7, 0);
lfo_compute_step(slot.m_amplitude_lfo, (slot.m_regs[6] >> 3) & 7, slot.m_regs[7] & 7, 1);
}
break;
}
}
READ8_MEMBER( multipcm_device::read )
{
return 0;
}
WRITE8_MEMBER( multipcm_device::write )
{
switch(offset)
{
case 0: //Data write
write_slot(m_slots[m_cur_slot], m_address, data);
break;
case 1:
m_cur_slot = VALUE_TO_CHANNEL[data & 0x1f];
break;
case 2:
m_address = (data > 7) ? 7 : data;
break;
}
}
/* MAME/M1 access functions */
DEFINE_DEVICE_TYPE(MULTIPCM, multipcm_device, "ymw258f", "Yamaha YMW-258-F")
multipcm_device::multipcm_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, MULTIPCM, tag, owner, clock),
device_sound_interface(mconfig, *this),
device_rom_interface(mconfig, *this, 24),
m_stream(nullptr),
m_slots(nullptr),
m_cur_slot(0),
m_address(0),
m_rate(0),
m_attack_step(nullptr),
m_decay_release_step(nullptr),
m_freq_step_table(nullptr),
m_left_pan_table(nullptr),
m_right_pan_table(nullptr),
m_linear_to_exp_volume(nullptr),
m_total_level_steps(nullptr)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void multipcm_device::device_start()
{
const float clock_divider = 180.0f;
m_rate = (float)clock() / clock_divider;
m_stream = machine().sound().stream_alloc(*this, 0, 2, m_rate);
// Volume + pan table
m_left_pan_table = make_unique_clear<int32_t[]>(0x800);
m_right_pan_table = make_unique_clear<int32_t[]>(0x800);
for (int32_t level = 0; level < 0x80; ++level)
{
const float vol_db = (float)level * (-24.0f) / 64.0f;
const float total_level = powf(10.0f, vol_db / 20.0f) / 4.0f;
for (int32_t pan = 0; pan < 0x10; ++pan)
{
float pan_left, pan_right;
if (pan == 0x8)
{
pan_left = 0.0;
pan_right = 0.0;
}
else if (pan == 0x0)
{
pan_left = 1.0;
pan_right = 1.0;
}
else if (pan & 0x8)
{
pan_left = 1.0;
const int32_t inverted_pan = 0x10 - pan;
const float pan_vol_db = (float)inverted_pan * (-12.0f) / 4.0f;
pan_right = pow(10.0f, pan_vol_db / 20.0f);
if ((inverted_pan & 0x7) == 7)
{
pan_right = 0.0;
}
}
else
{
pan_right = 1.0;
const float pan_vol_db = (float)pan * (-12.0f) / 4.0f;
pan_left = pow(10.0f, pan_vol_db / 20.0f);
if ((pan & 0x7) == 7)
{
pan_left = 0.0;
}
}
m_left_pan_table[(pan << 7) | level] = value_to_fixed(TL_SHIFT, pan_left * total_level);
m_right_pan_table[(pan << 7) | level] = value_to_fixed(TL_SHIFT, pan_right * total_level);
}
}
//Pitch steps
m_freq_step_table = make_unique_clear<uint32_t[]>(0x400);
for (int32_t i = 0; i < 0x400; ++i)
{
const float fcent = m_rate * (1024.0f + (float)i) / 1024.0f;
m_freq_step_table[i] = value_to_fixed(TL_SHIFT, fcent);
}
// Envelope steps
m_attack_step = make_unique_clear<uint32_t[]>(0x40);
m_decay_release_step = make_unique_clear<uint32_t[]>(0x40);
const double attack_rate_to_decay_rate = 14.32833;
for (int32_t i = 4; i < 0x40; ++i)
{
// Times are based on 44100Hz clock, adjust to real chip clock
m_attack_step[i] = (float)(0x400 << EG_SHIFT) / (float)(BASE_TIMES[i] * 44100.0 / 1000.0);
m_decay_release_step[i] = (float)(0x400 << EG_SHIFT) / (float)(BASE_TIMES[i] * attack_rate_to_decay_rate * 44100.0 / 1000.0);
}
m_attack_step[0] = m_attack_step[1] = m_attack_step[2] = m_attack_step[3] = 0;
m_attack_step[0x3f] = 0x400 << EG_SHIFT;
m_decay_release_step[0] = m_decay_release_step[1] = m_decay_release_step[2] = m_decay_release_step[3] = 0;
// Total level interpolation steps
m_total_level_steps = make_unique_clear<int32_t[]>(2);
m_total_level_steps[0] = -(float)(0x80 << TL_SHIFT) / (78.2f * 44100.0f / 1000.0f); // lower
m_total_level_steps[1] = (float)(0x80 << TL_SHIFT) / (78.2f * 2 * 44100.0f / 1000.0f); // raise
// build the linear->exponential ramps
m_linear_to_exp_volume = make_unique_clear<int32_t[]>(0x400);
for(int32_t i = 0; i < 0x400; ++i)
{
const float db = -(96.0f - (96.0f * (float)i / (float)0x400));
const float exp_volume = powf(10.0f, db / 20.0f);
m_linear_to_exp_volume[i] = value_to_fixed(TL_SHIFT, exp_volume);
}
save_item(NAME(m_cur_slot));
save_item(NAME(m_address));
// Slots
m_slots = make_unique_clear<slot_t[]>(28);
for (int32_t slot = 0; slot < 28; ++slot)
{
m_slots[slot].m_slot_index = slot;
m_slots[slot].m_playing = false;
save_item(NAME(m_slots[slot].m_slot_index), slot);
save_item(NAME(m_slots[slot].m_regs), slot);
save_item(NAME(m_slots[slot].m_playing), slot);
save_item(NAME(m_slots[slot].m_base), slot);
save_item(NAME(m_slots[slot].m_offset), slot);
save_item(NAME(m_slots[slot].m_step), slot);
save_item(NAME(m_slots[slot].m_pan), slot);
save_item(NAME(m_slots[slot].m_total_level), slot);
save_item(NAME(m_slots[slot].m_dest_total_level), slot);
save_item(NAME(m_slots[slot].m_total_level_step), slot);
save_item(NAME(m_slots[slot].m_prev_sample), slot);
save_item(NAME(m_slots[slot].m_envelope_gen.m_volume), slot);
save_item(NAME(m_slots[slot].m_envelope_gen.m_state), slot);
save_item(NAME(m_slots[slot].m_envelope_gen.step), slot);
save_item(NAME(m_slots[slot].m_envelope_gen.m_attack_rate), slot);
save_item(NAME(m_slots[slot].m_envelope_gen.m_decay1_rate), slot);
save_item(NAME(m_slots[slot].m_envelope_gen.m_decay2_rate), slot);
save_item(NAME(m_slots[slot].m_envelope_gen.m_release_rate), slot);
save_item(NAME(m_slots[slot].m_envelope_gen.m_decay_level), slot);
save_item(NAME(m_slots[slot].m_pitch_lfo.m_phase), slot);
save_item(NAME(m_slots[slot].m_pitch_lfo.m_phase_step), slot);
save_item(NAME(m_slots[slot].m_amplitude_lfo.m_phase), slot);
save_item(NAME(m_slots[slot].m_amplitude_lfo.m_phase_step), slot);
}
lfo_init();
}
//-------------------------------------------------
// device_clock_changed - called if the clock
// changes
//-------------------------------------------------
void multipcm_device::device_clock_changed()
{
const float clock_divider = 180.0f;
m_rate = (float)clock() / clock_divider;
m_stream->set_sample_rate(m_rate);
for (int32_t i = 0; i < 0x400; ++i)
{
const float fcent = m_rate * (1024.0f + (float)i) / 1024.0f;
m_freq_step_table[i] = value_to_fixed(TL_SHIFT, fcent);
}
}
//-----------------------------------------------------
// clamp_to_int16 - clamp a 32-bit value to 16 bits
//-----------------------------------------------------
int16_t multipcm_device::clamp_to_int16(int32_t value)
{
if (value < -32768)
{
return -32768;
}
else if (value > 32767)
{
return 32767;
}
return (int16_t)value;
}
#if MULTIPCM_LOG_SAMPLES
void multipcm_device::dump_sample(slot_t &slot)
{
if (m_logged_map[slot.m_base])
return;
m_logged_map[slot.m_base] = true;
char filebuf[256];
snprintf(filebuf, 256, "multipcm%08x.wav", slot.m_base);
wav_file *file = wav_open(filebuf, m_stream->sample_rate(), 1);
if (file == nullptr)
return;
uint32_t offset = slot.m_offset;
bool done = false;
while (!done)
{
int16_t sample = (int16_t) (read_byte(slot.m_base + (offset >> TL_SHIFT)) << 8);
wav_add_data_16(file, &sample, 1);
offset += 1 << TL_SHIFT;
if (offset >= (slot.m_sample.m_end << TL_SHIFT))
{
done = true;
}
}
wav_close(file);
}
#endif
//-------------------------------------------------
// sound_stream_update - handle a stream update
//-------------------------------------------------
void multipcm_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int32_t samples)
{
stream_sample_t *datap[2];
datap[0] = outputs[0];
datap[1] = outputs[1];
memset(datap[0], 0, sizeof(*datap[0]) * samples);
memset(datap[1], 0, sizeof(*datap[1]) * samples);
for (int32_t i = 0; i < samples; ++i)
{
int32_t smpl = 0;
int32_t smpr = 0;
for (int32_t sl = 0; sl < 28; ++sl)
{
slot_t &slot = m_slots[sl];
if (slot.m_playing)
{
uint32_t vol = (slot.m_total_level >> TL_SHIFT) | (slot.m_pan << 7);
uint32_t adr = slot.m_offset >> TL_SHIFT;
uint32_t step = slot.m_step;
int32_t csample = (int16_t) (read_byte(slot.m_base + adr) << 8);
int32_t fpart = slot.m_offset & ((1 << TL_SHIFT) - 1);
int32_t sample = (csample * fpart + slot.m_prev_sample * ((1 << TL_SHIFT) - fpart)) >> TL_SHIFT;
if (slot.m_regs[6] & 7) // Vibrato enabled
{
step = step * pitch_lfo_step(slot.m_pitch_lfo);
step >>= TL_SHIFT;
}
slot.m_offset += step;
if (slot.m_offset >= (slot.m_sample.m_end << TL_SHIFT))
{
slot.m_offset = slot.m_sample.m_loop << TL_SHIFT;
}
if (adr ^ (slot.m_offset >> TL_SHIFT))
{
slot.m_prev_sample = csample;
}
if ((slot.m_total_level >> TL_SHIFT) != slot.m_dest_total_level)
{
slot.m_total_level += slot.m_total_level_step;
}
if (slot.m_regs[7] & 7) // Tremolo enabled
{
sample = sample * amplitude_lfo_step(slot.m_amplitude_lfo);
sample >>= TL_SHIFT;
}
sample = (sample * envelope_generator_update(slot)) >> 10;
smpl += (m_left_pan_table[vol] * sample) >> TL_SHIFT;
smpr += (m_right_pan_table[vol] * sample) >> TL_SHIFT;
}
}
datap[0][i] = clamp_to_int16(smpl);
datap[1][i] = clamp_to_int16(smpr);
}
}
//-------------------------------------------------
// rom_bank_updated - the rom bank has changed
//-------------------------------------------------
void multipcm_device::rom_bank_updated()
{
m_stream->update();
}