// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
/**************************************************************************************
Wonderswan sound emulation
Wilbert Pol
Sound emulation is preliminary and not complete
The noise taps and behavior are the same as the Virtual Boy.
**************************************************************************************/
#include "emu.h"
#include "wswan.h"
// device type definition
DEFINE_DEVICE_TYPE(WSWAN_SND, wswan_sound_device, "wswan_sound", "WonderSwan Custom Sound")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// wswan_sound_device - constructor
//-------------------------------------------------
wswan_sound_device::wswan_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, WSWAN_SND, tag, owner, clock),
device_sound_interface(mconfig, *this),
device_rom_interface(mconfig, *this),
m_channel(nullptr),
m_sweep_step(0),
m_sweep_time(0),
m_sweep_count(0),
m_noise_type(0),
m_noise_reset(0),
m_noise_enable(0),
m_noise_output(0),
m_sample_address(0),
m_audio2_voice(0),
m_audio3_sweep(0),
m_audio4_noise(0),
m_mono(0),
m_output_volume(0),
m_external_stereo(0),
m_external_speaker(0),
m_noise_shift(0),
m_master_volume(0)
{
}
constexpr int clk_div = 64;
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void wswan_sound_device::device_start()
{
m_channel = stream_alloc(0, 2, clock() / clk_div);
save_item(NAME(m_sweep_step));
save_item(NAME(m_sweep_time));
save_item(NAME(m_sweep_count));
save_item(NAME(m_noise_type));
save_item(NAME(m_noise_reset));
save_item(NAME(m_noise_enable));
save_item(NAME(m_sample_address));
save_item(NAME(m_audio2_voice));
save_item(NAME(m_audio3_sweep));
save_item(NAME(m_audio4_noise));
save_item(NAME(m_mono));
save_item(NAME(m_output_volume));
save_item(NAME(m_external_stereo));
save_item(NAME(m_external_speaker));
save_item(NAME(m_noise_shift));
save_item(NAME(m_master_volume));
save_item(NAME(m_audio1.freq));
save_item(NAME(m_audio1.period));
save_item(NAME(m_audio1.pos));
save_item(NAME(m_audio1.vol_left));
save_item(NAME(m_audio1.vol_right));
save_item(NAME(m_audio1.on));
save_item(NAME(m_audio1.offset));
save_item(NAME(m_audio1.signal));
save_item(NAME(m_audio2.freq));
save_item(NAME(m_audio2.period));
save_item(NAME(m_audio2.pos));
save_item(NAME(m_audio2.vol_left));
save_item(NAME(m_audio2.vol_right));
save_item(NAME(m_audio2.on));
save_item(NAME(m_audio2.offset));
save_item(NAME(m_audio2.signal));
save_item(NAME(m_audio3.freq));
save_item(NAME(m_audio3.period));
save_item(NAME(m_audio3.pos));
save_item(NAME(m_audio3.vol_left));
save_item(NAME(m_audio3.vol_right));
save_item(NAME(m_audio3.on));
save_item(NAME(m_audio3.offset));
save_item(NAME(m_audio3.signal));
save_item(NAME(m_audio4.freq));
save_item(NAME(m_audio4.period));
save_item(NAME(m_audio4.pos));
save_item(NAME(m_audio4.vol_left));
save_item(NAME(m_audio4.vol_right));
save_item(NAME(m_audio4.on));
save_item(NAME(m_audio4.offset));
save_item(NAME(m_audio4.signal));
}
void wswan_sound_device::device_clock_changed()
{
m_channel->set_sample_rate(clock() / clk_div);
}
void wswan_sound_device::rom_bank_updated()
{
m_channel->update();
}
//-------------------------------------------------
// device_reset
//-------------------------------------------------
void wswan_sound_device::device_reset()
{
m_audio1.on = 0;
m_audio1.signal = 0;
m_audio1.offset = 0;
m_audio1.pos = 0;
m_audio2.on = 0;
m_audio2.signal = 0;
m_audio2.offset = 0;
m_audio2.pos = 0;
m_audio3.on = 0;
m_audio3.signal = 0;
m_audio3.offset = 0;
m_audio3.pos = 0;
m_audio4.on = 0;
m_audio4.signal = 0;
m_audio4.offset = 0;
m_audio4.pos = 0;
m_noise_output = 0;
}
int wswan_sound_device::fetch_sample(int channel, int offset)
{
uint8_t b = read_byte(m_sample_address + ((channel & 3) << 4) + ((offset & 0x1f) >> 1));
if (offset & 1)
return b >> 4;
else
return b & 0xf;
}
//-------------------------------------------------
// sound_stream_update - handle a stream update
//-------------------------------------------------
void wswan_sound_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
{
s32 sample, left, right;
auto &outputl = outputs[0];
auto &outputr = outputs[1];
for (int sampindex = 0; sampindex < outputl.samples(); sampindex++)
{
left = right = 0;
if ( m_audio1.on )
{
sample = m_audio1.signal;
m_audio1.pos += clk_div;
if (m_audio1.pos >= m_audio1.period)
{
m_audio1.pos -= m_audio1.period;
m_audio1.signal = fetch_sample(0, m_audio1.offset++);
}
left += m_audio1.vol_left * sample;
right += m_audio1.vol_right * sample;
}
if ( m_audio2.on )
{
if ( m_audio2_voice )
{
uint8_t voice_data = m_audio2.vol_left << 4 | m_audio2.vol_right;
left += voice_data * (m_master_volume & 0x0f);
right += voice_data * (m_master_volume & 0x0f);
}
else
{
sample = m_audio2.signal;
m_audio2.pos += clk_div;
if (m_audio2.pos >= m_audio2.period)
{
m_audio2.pos -= m_audio2.period;
m_audio2.signal = fetch_sample(1, m_audio2.offset++);
}
left += m_audio2.vol_left * sample;
right += m_audio2.vol_right * sample;
}
}
if ( m_audio3.on )
{
sample = m_audio3.signal;
m_audio3.pos += clk_div;
if (m_audio3.pos >= m_audio3.period)
{
m_audio3.pos -= m_audio3.period;
m_audio3.signal = fetch_sample(2, m_audio3.offset++);
}
if ( m_audio3_sweep && m_sweep_time )
{
m_sweep_count += clk_div;
if ( m_sweep_count >= m_sweep_time )
{
m_sweep_count -= m_sweep_time;
m_audio3.freq += m_sweep_step;
m_audio3.freq &= 0x7ff;
m_audio3.period = 2048 - m_audio3.freq;
}
}
left += m_audio3.vol_left * sample;
right += m_audio3.vol_right * sample;
}
if ( m_audio4.on )
{
sample = m_audio4.signal;
m_audio4.pos += clk_div;
if (m_audio4.pos >= m_audio4.period)
{
if (m_audio4_noise)
m_audio4.signal = m_noise_output ? 0xf : 0;
else
m_audio4.signal = fetch_sample(3, m_audio4.offset++);
m_audio4.pos -= m_audio4.period;
if (m_noise_reset)
{
m_noise_reset = 0;
m_noise_shift = 0;
m_noise_output = 0;
}
if (m_noise_enable)
{
static int shift_bit[] = { 14, 10, 13, 4, 8, 6, 9, 11 };
m_noise_output = (1 ^ (m_noise_shift >> 7) ^ (m_noise_shift >> shift_bit[m_noise_type])) & 1;
m_noise_shift = m_noise_shift << 1 | m_noise_output;
}
}
left += m_audio4.vol_left * sample;
right += m_audio4.vol_right * sample;
}
outputl.put_int(sampindex, left, 32768 >> 5);
outputr.put_int(sampindex, right, 32768 >> 5);
}
}
void wswan_sound_device::wswan_ch_set_freq( CHAN *ch, uint16_t freq )
{
freq &= 0x7ff; // docs say freq is 11bits and a few games (Morita Shougi, World Stadium + others) write 0x800 causing a divide by 0 crash
ch->freq = freq;
ch->period = 2048 - freq;
}
void wswan_sound_device::port_w(offs_t offset, uint8_t data)
{
m_channel->update();
switch( offset )
{
case 0x80: /* Audio 1 freq (lo) */
wswan_ch_set_freq(&m_audio1, (m_audio1.freq & 0xff00) | data);
break;
case 0x81: /* Audio 1 freq (hi) */
wswan_ch_set_freq(&m_audio1, (data << 8 ) | (m_audio1.freq & 0x00ff));
break;
case 0x82: /* Audio 2 freq (lo) */
wswan_ch_set_freq(&m_audio2, (m_audio2.freq & 0xff00) | data);
break;
case 0x83: /* Audio 2 freq (hi) */
wswan_ch_set_freq(&m_audio2, (data << 8 ) | (m_audio2.freq & 0x00ff));
break;
case 0x84: /* Audio 3 freq (lo) */
wswan_ch_set_freq(&m_audio3, (m_audio3.freq & 0xff00) | data);
break;
case 0x85: /* Audio 3 freq (hi) */
wswan_ch_set_freq(&m_audio3, (data << 8) | (m_audio3.freq & 0x00ff));
break;
case 0x86: /* Audio 4 freq (lo) */
wswan_ch_set_freq(&m_audio4, (m_audio4.freq & 0xff00) | data);
break;
case 0x87: /* Audio 4 freq (hi) */
wswan_ch_set_freq(&m_audio4, (data << 8) | (m_audio4.freq & 0x00ff));
break;
case 0x88: /* Audio 1 volume */
m_audio1.vol_left = ( data & 0xF0 ) >> 4;
m_audio1.vol_right = data & 0x0F;
break;
case 0x89: /* Audio 2 volume */
m_audio2.vol_left = ( data & 0xF0 ) >> 4;
m_audio2.vol_right = data & 0x0F;
break;
case 0x8A: /* Audio 3 volume */
m_audio3.vol_left = ( data & 0xF0 ) >> 4;
m_audio3.vol_right = data & 0x0F;
break;
case 0x8B: /* Audio 4 volume */
m_audio4.vol_left = ( data & 0xF0 ) >> 4;
m_audio4.vol_right = data & 0x0F;
break;
case 0x8C: /* Sweep step */
m_sweep_step = (int8_t)data;
break;
case 0x8D: /* Sweep time */
m_sweep_time = 8192 * (data + 1);
break;
case 0x8E: /* Noise control */
m_noise_type = data & 0x07;
m_noise_reset = ( data & 0x08 ) >> 3;
m_noise_enable = ( data & 0x10 ) >> 4;
break;
case 0x8F: /* Sample location */
m_sample_address = data << 6;
break;
case 0x90: /* Audio control */
m_audio1.on = data & 0x01;
m_audio2.on = ( data & 0x02 ) >> 1;
m_audio3.on = ( data & 0x04 ) >> 2;
m_audio4.on = ( data & 0x08 ) >> 3;
m_audio2_voice = ( data & 0x20 ) >> 5;
m_audio3_sweep = ( data & 0x40 ) >> 6;
m_audio4_noise = ( data & 0x80 ) >> 7;
break;
case 0x91: /* Audio output */
m_mono = data & 0x01;
m_output_volume = ( data & 0x06 ) >> 1;
m_external_stereo = ( data & 0x08 ) >> 3;
m_external_speaker = 1;
break;
case 0x92: /* Noise counter shift register (lo) */
m_noise_shift = ( m_noise_shift & 0xFF00 ) | data;
break;
case 0x93: /* Noise counter shift register (hi) */
m_noise_shift = ( ( data & 0x7f ) << 8 ) | ( m_noise_shift & 0x00FF );
break;
case 0x94: /* Master volume */
m_master_volume = data;
break;
}
}