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|
// license:BSD-3-Clause
// copyright-holders:Tomasz Slanina,cam900
/************************************
Seta PCM emulation
sound emulation by Tomasz Slanina
based on ST-0016 emulation
used by
- ST-0026 NiLe (srmp6, 8 voices)
- ST-0032 (jclub2, 16 voices)
- Capcom CPS3 sound hardware has similarity?
Register Format (32 byte per voices)
00-1f: Voice 0
Offset Bit Description
fedcba98 76543210
04 xxxxxxxx xxxxxxxx Start position LSB
06 xxxxxxxx xxxxxxxx Start position MSB
0a -------- ----xxx- Used but unknown
-------- -----x-- See below for NiLe specific? notes
-------- -------x Loop enable
0c xxxxxxxx xxxxxxxx Frequency
0e xxxxxxxx xxxxxxxx Loop Start position LSB
12 xxxxxxxx xxxxxxxx Loop Start position MSB
14 xxxxxxxx xxxxxxxx Loop End position LSB
16 xxxxxxxx xxxxxxxx Loop End position MSB
18 xxxxxxxx xxxxxxxx End position LSB
1a xxxxxxxx xxxxxxxx End position MSB
1c xxxxxxxx xxxxxxxx Right Volume
1e xxxxxxxx xxxxxxxx Left Volume
20-3f: Voice 1
...
e0-ff: Voice 7
100: Keyon/off, Bit 0-7 means Voice 0-7
110: Used but unknown
below for 16 voice configurations:
100-11f: Voice 8
120-13f: Voice 9
...
1e0-1ff: Voice 15
200: Keyon/off, Bit 0-15 means Voice 0-15
210: Used but unknown
Other registers are unknown/unused
TODO:
- Verify loop and flag bit behavior from real hardware
************************************/
#include "emu.h"
#include "setapcm.h"
// constants
template<unsigned MaxVoices, unsigned Divider>
constexpr unsigned setapcm_device<MaxVoices, Divider>::MAX_VOICES;
template<unsigned MaxVoices, unsigned Divider>
constexpr unsigned setapcm_device<MaxVoices, Divider>::CLOCK_DIVIDER;
// device type definition
DEFINE_DEVICE_TYPE(NILE_SOUND, nile_sound_device, "nile_sound", "Seta ST-0026 NiLe (Sound)")
DEFINE_DEVICE_TYPE(ST0032_SOUND, st0032_sound_device, "st0032_sound", "Seta ST-0032 (Sound)")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// setapcm_device - constructor
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
setapcm_device<MaxVoices, Divider>::setapcm_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, type, tag, owner, clock)
, device_sound_interface(mconfig, *this)
, device_rom_interface(mconfig, *this)
, m_stream(nullptr)
, m_keyctrl(0)
{
}
nile_sound_device::nile_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: setapcm_device<8, 160>(mconfig, NILE_SOUND, tag, owner, clock)
{
}
st0032_sound_device::st0032_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: setapcm_device<16, 384>(mconfig, ST0032_SOUND, tag, owner, clock)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
void setapcm_device<MaxVoices, Divider>::device_start()
{
// allocate stream
m_stream = stream_alloc(0, 2, clock() / CLOCK_DIVIDER);
// set host device to each voices
for (auto & elem : m_voice)
elem.m_host = this;
save_item(STRUCT_MEMBER(m_voice, m_start));
save_item(STRUCT_MEMBER(m_voice, m_flags));
save_item(STRUCT_MEMBER(m_voice, m_freq));
save_item(STRUCT_MEMBER(m_voice, m_lpstart));
save_item(STRUCT_MEMBER(m_voice, m_lpend));
save_item(STRUCT_MEMBER(m_voice, m_end));
save_item(STRUCT_MEMBER(m_voice, m_vol_r));
save_item(STRUCT_MEMBER(m_voice, m_vol_l));
save_item(STRUCT_MEMBER(m_voice, m_pos));
save_item(STRUCT_MEMBER(m_voice, m_frac));
save_item(STRUCT_MEMBER(m_voice, m_lponce));
save_item(STRUCT_MEMBER(m_voice, m_keyon));
save_item(STRUCT_MEMBER(m_voice, m_out));
save_item(NAME(m_keyctrl));
}
//-------------------------------------------------
// device_clock_changed - called if the clock
// changes
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
void setapcm_device<MaxVoices, Divider>::device_clock_changed()
{
m_stream->set_sample_rate(clock() / CLOCK_DIVIDER);
}
//-------------------------------------------------
// sound_stream_update - handle update requests
// for our sound stream
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
void setapcm_device<MaxVoices, Divider>::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
{
outputs[0].fill(0);
outputs[1].fill(0);
for (int sampleind = 0; sampleind < outputs[0].samples(); sampleind++)
{
for (int v = 0; v < MAX_VOICES; v++)
{
// check if voice is activated
if (m_voice[v].update())
{
outputs[0].add_int(sampleind, (m_voice[v].m_out * m_voice[v].m_vol_l) >> 16, 32768 * MAX_VOICES);
outputs[1].add_int(sampleind, (m_voice[v].m_out * m_voice[v].m_vol_r) >> 16, 32768 * MAX_VOICES);
}
}
}
}
//-------------------------------------------------
// rom_bank_pre_change - refresh the stream if the
// ROM banking changes
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
void setapcm_device<MaxVoices, Divider>::rom_bank_pre_change()
{
m_stream->update();
}
//-------------------------------------------------
// update - update single voice
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
bool setapcm_device<MaxVoices, Divider>::voice_t::update()
{
if (m_keyon)
{
// fetch sample
m_out = s16(s8(m_host->read_byte(m_pos))) << 8;
// advance
m_frac += m_freq;
m_pos += m_frac >> 12;
m_frac &= 0xfff;
// stop if we're at the end
if (m_lponce)
{
// we've looped once, check loop end rather than sample end
if (m_pos >= m_lpend)
{
m_pos = m_lpstart;
}
}
else
{
// not looped yet, check sample end
if (m_pos >= m_end)
{
// code at 11d8c:
// if bit 2 (0x4) is set, check if loop start = loop end.
// if they are equal, clear bit 0 and don't set the loop start/end
// registers in the NiLe. if they aren't, set bit 0 and set
// the loop start/end registers in the NiLe.
// TODO: ST-0032 has same behavior?
if (BIT(m_flags, 0))
{
m_pos = m_lpstart;
m_lponce = true;
}
else
{
m_keyon = false;
}
}
}
return true;
}
// clear output
m_out = 0;
return false;
}
//-------------------------------------------------
// keyon - set keyon flag for single voice
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
void setapcm_device<MaxVoices, Divider>::voice_t::keyon()
{
m_keyon = true;
m_pos = m_start;
m_frac = 0;
m_lponce = false;
}
//-------------------------------------------------
// keyoff - set keyoff flag for single voice
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
void setapcm_device<MaxVoices, Divider>::voice_t::keyoff()
{
m_keyon = false;
}
//-------------------------------------------------
// reg_r - read single voice registers
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
u16 setapcm_device<MaxVoices, Divider>::voice_t::reg_r(offs_t reg)
{
u16 ret = 0;
switch (reg & 0xf)
{
case 0x02: // Current position LSB
ret = m_pos & 0xffff;
break;
case 0x03: // Current position MSB
ret = m_pos >> 16;
break;
case 0x05: // Flags
ret = m_flags;
break;
case 0x06: // Frequency
ret = m_freq;
break;
case 0x07: // Loop start position LSB
ret = m_lpstart & 0xffff;
break;
case 0x09: // Loop start position MSB
ret = m_lpstart >> 16;
break;
case 0x0a: // Loop end position LSB
ret = m_lpend & 0xffff;
break;
case 0x0b: // Loop end position MSB
ret = m_lpend >> 16;
break;
case 0x0c: // End position LSB
ret = m_end & 0xffff;
break;
case 0x0d: // End position MSB
ret = m_end >> 16;
break;
case 0x0e: // Right volume
ret = m_vol_r;
break;
case 0x0f: // Left volume
ret = m_vol_l;
break;
}
return ret;
}
//-------------------------------------------------
// reg_w - write single voice registers
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
void setapcm_device<MaxVoices, Divider>::voice_t::reg_w(offs_t reg, u16 data, u16 mem_mask)
{
switch (reg & 0xf)
{
case 0x02: // Start position LSB, also affected current position?
m_start = m_pos = (m_start & ~mem_mask) | (data & mem_mask);
break;
case 0x03: // Start position MSB
m_start = m_pos = (m_start & ~(u32(mem_mask) << 16)) | (u32(data & mem_mask) << 16);
break;
case 0x05: // Flags
COMBINE_DATA(&m_flags);
break;
case 0x06: // Frequency
COMBINE_DATA(&m_freq);
break;
case 0x07: // Loop start position LSB
m_lpstart = (m_lpstart & ~mem_mask) | (data & mem_mask);
break;
case 0x09: // Loop start position MSB
m_lpstart = (m_lpstart & ~(u32(mem_mask) << 16)) | (u32(data & mem_mask) << 16);
break;
case 0x0a: // Loop end position LSB
m_lpend = (m_lpend & ~mem_mask) | (data & mem_mask);
break;
case 0x0b: // Loop end position MSB
m_lpend = (m_lpend & ~(u32(mem_mask) << 16)) | (u32(data & mem_mask) << 16);
break;
case 0x0c: // End position LSB
m_end = (m_end & ~mem_mask) | (data & mem_mask);
break;
case 0x0d: // End position MSB
m_end = (m_end & ~(u32(mem_mask) << 16)) | (u32(data & mem_mask) << 16);
break;
case 0x0e: // Right volume
COMBINE_DATA(&m_vol_r);
break;
case 0x0f: // Left volume
COMBINE_DATA(&m_vol_l);
break;
}
}
//-------------------------------------------------
// snd_w - write each voice registers
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
void setapcm_device<MaxVoices, Divider>::snd_w(offs_t offset, u16 data, u16 mem_mask)
{
m_stream->update();
const int v = (offset >> 4);
if (v >= MAX_VOICES)
return;
m_voice[v].reg_w(offset & 0xf, data, mem_mask);
//logerror("v%02d: %04x & %04x to reg %02d (PC=%x)\n", v, data, mem_mask, r, machine().describe_context());
}
//-------------------------------------------------
// snd_r - read each voice registers
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
u16 setapcm_device<MaxVoices, Divider>::snd_r(offs_t offset)
{
const int v = (offset >> 4);
if (v >= MAX_VOICES)
return 0;
m_stream->update();
return m_voice[v].reg_r(offset & 0xf);
}
//-------------------------------------------------
// key_w - set keyon/off flags for each voices
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
void setapcm_device<MaxVoices, Divider>::key_w(offs_t offset, u16 data, u16 mem_mask)
{
const u16 prev = m_keyctrl;
m_stream->update();
COMBINE_DATA(&m_keyctrl);
//logerror("KEYCTRL: %04x -> %04x %s\n", prev, m_keyctrl, machine().describe_context());
for (int v = 0; v < MAX_VOICES; v++)
{
if (BIT(m_keyctrl, v) && (!(BIT(prev, v)))) // keyon
{
m_voice[v].keyon();
}
else if ((!(BIT(m_keyctrl, v))) && BIT(prev, v)) // keyoff
{
m_voice[v].keyoff();
}
}
}
//-------------------------------------------------
// key_r - get keyon/off status from each voices
//-------------------------------------------------
template<unsigned MaxVoices, unsigned Divider>
u16 setapcm_device<MaxVoices, Divider>::key_r()
{
m_stream->update();
return m_keyctrl;
}
// template class definition
template class setapcm_device<8, 160>;
template class setapcm_device<16, 384>;
|