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Diffstat (limited to 'src/mame/audio/snk6502.cpp')
-rw-r--r-- | src/mame/audio/snk6502.cpp | 993 |
1 files changed, 993 insertions, 0 deletions
diff --git a/src/mame/audio/snk6502.cpp b/src/mame/audio/snk6502.cpp new file mode 100644 index 00000000000..1f2afed4216 --- /dev/null +++ b/src/mame/audio/snk6502.cpp @@ -0,0 +1,993 @@ +// license:BSD-3-Clause +// copyright-holders:Nicola Salmoria, Dan Boris +/* from Andrew Scott (ascott@utkux.utcc.utk.edu) */ + +/* + updated by BUT + - corrected music tempo (not confirmed Satan of Saturn and clone) + - adjusted music freq (except Satan of Saturn and clone) + - adjusted music waveform + - support playing flag for music channel 0 + - support HD38880 speech by samples +*/ + + +#include "emu.h" +#include "sound/samples.h" +#include "includes/snk6502.h" +#include "sound/discrete.h" + + +#ifndef M_LN2 +#define M_LN2 0.69314718055994530942 +#endif + +#define TONE_VOLUME 50 + +#define SAMPLE_RATE (48000) +#define FRAC_BITS 16 +#define FRAC_ONE (1 << FRAC_BITS) +#define FRAC_MASK (FRAC_ONE - 1) + +const char *const sasuke_sample_names[] = +{ + "*sasuke", + + // SN76477 and discrete + "hit", + "boss_start", + "shot", + "boss_attack", + + 0 +}; + +const char *const vanguard_sample_names[] = +{ + "*vanguard", + + // SN76477 and discrete + "fire", + "explsion", + + // HD38880 speech + "vg_voi-0", + "vg_voi-1", + "vg_voi-2", + "vg_voi-3", + "vg_voi-4", + "vg_voi-5", + "vg_voi-6", + "vg_voi-7", + "vg_voi-8", + "vg_voi-9", + "vg_voi-a", + "vg_voi-b", + "vg_voi-c", + "vg_voi-d", + "vg_voi-e", + "vg_voi-f", + + 0 +}; + + +const char *const fantasy_sample_names[] = +{ + "*fantasy", + + // HD38880 speech + "ft_voi-0", + "ft_voi-1", + "ft_voi-2", + "ft_voi-3", + "ft_voi-4", + "ft_voi-5", + "ft_voi-6", + "ft_voi-7", + "ft_voi-8", + "ft_voi-9", + "ft_voi-a", + "ft_voi-b", + + 0 +}; + + +/************************************************************************ + * fantasy Sound System Analog emulation + * July 2008, D. Renaud + ************************************************************************/ + +static const discrete_op_amp_filt_info fantasy_filter = +{ + RES_K(10.5), 0, RES_K(33), 0, RES_K(470), CAP_U(.01), CAP_U(.01), 0, 0, 12, -12 +}; + +#define FANTASY_BOMB_EN NODE_01 +#define FANTASY_NOISE_STREAM_IN NODE_02 +#define FANTASY_NOISE_LOGIC NODE_03 + +DISCRETE_SOUND_START( fantasy ) + + DISCRETE_INPUT_LOGIC (FANTASY_BOMB_EN) + DISCRETE_INPUT_STREAM(FANTASY_NOISE_STREAM_IN, 0) + + /* This is not the perfect way to discharge, but it is good enough for now */ + /* it does not take into acount that there is no discharge when noise is low */ + DISCRETE_RCDISC2(NODE_10, FANTASY_BOMB_EN, 0, RES_K(10) + RES_K(33), DEFAULT_TTL_V_LOGIC_1 - 0.5, RES_K(1), CAP_U(1)) + DISCRETE_CLAMP(FANTASY_NOISE_LOGIC, FANTASY_NOISE_STREAM_IN, 0, 1) + DISCRETE_SWITCH(NODE_11, 1, FANTASY_NOISE_LOGIC, 0, NODE_10) + + DISCRETE_OP_AMP_FILTER(NODE_20, 1, NODE_11, 0, DISC_OP_AMP_FILTER_IS_BAND_PASS_1M, &fantasy_filter) + DISCRETE_RCFILTER(NODE_21, NODE_20, RES_K(22), CAP_U(.01)) + DISCRETE_RCFILTER(NODE_22, NODE_21, RES_K(22) + RES_K(22), CAP_P(2200)) + DISCRETE_RCFILTER(NODE_23, NODE_22, RES_K(22) + RES_K(22) + RES_K(22), CAP_U(.001)) + + DISCRETE_OUTPUT(NODE_23, 32760.0/12) +DISCRETE_SOUND_END + + +const device_type SNK6502 = &device_creator<snk6502_sound_device>; + +snk6502_sound_device::snk6502_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, SNK6502, "SNK6502 Audio Custom", tag, owner, clock, "snk6502_sound", __FILE__), + device_sound_interface(mconfig, *this), + //m_tone_channels[CHANNELS], + m_tone_clock_expire(0), + m_tone_clock(0), + m_tone_stream(NULL), + m_samples(*this, ":samples"), + m_ROM(NULL), + m_Sound0StopOnRollover(0), + m_LastPort1(0), + m_hd38880_cmd(0), + m_hd38880_addr(0), + m_hd38880_data_bytes(0), + m_hd38880_speed(0) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void snk6502_sound_device::device_start() +{ + m_ROM = machine().root_device().memregion("snk6502")->base(); + + // adjusted + set_music_freq(43000); + + // 38.99 Hz update (according to schematic) + set_music_clock(M_LN2 * (RES_K(18) * 2 + RES_K(1)) * CAP_U(1)); + + m_tone_stream = machine().sound().stream_alloc(*this, 0, 1, SAMPLE_RATE); + + for (int i = 0; i < CHANNELS; i++) + { + save_item(NAME(m_tone_channels[i].mute), i); + save_item(NAME(m_tone_channels[i].offset), i); + save_item(NAME(m_tone_channels[i].base), i); + save_item(NAME(m_tone_channels[i].mask), i); + save_item(NAME(m_tone_channels[i].sample_step), i); + save_item(NAME(m_tone_channels[i].sample_cur), i); + save_item(NAME(m_tone_channels[i].form), i); + } + + save_item(NAME(m_tone_clock)); + save_item(NAME(m_Sound0StopOnRollover)); + save_item(NAME(m_LastPort1)); + save_item(NAME(m_hd38880_cmd)); + save_item(NAME(m_hd38880_addr)); + save_item(NAME(m_hd38880_data_bytes)); + save_item(NAME(m_hd38880_speed)); +} + +inline void snk6502_sound_device::validate_tone_channel(int channel) +{ + if (!m_tone_channels[channel].mute) + { + UINT8 romdata = m_ROM[m_tone_channels[channel].base + m_tone_channels[channel].offset]; + + if (romdata != 0xff) + m_tone_channels[channel].sample_step = m_tone_channels[channel].sample_rate / (256 - romdata); + else + m_tone_channels[channel].sample_step = 0; + } +} + +void snk6502_sound_device::sasuke_build_waveform(int mask) +{ + int bit0, bit1, bit2, bit3; + int base; + int i; + + mask &= 7; + + //logerror("0: wave form = %d\n", mask); + bit0 = bit1 = bit3 = 0; + bit2 = 1; + + if (mask & 1) + bit0 = 1; + if (mask & 2) + bit1 = 1; + if (mask & 4) + bit3 = 1; + + base = (bit0 + bit1 + bit2 + bit3 + 1) / 2; + + for (i = 0; i < 16; i++) + { + int data = 0; + + if (i & 1) + data += bit0; + if (i & 2) + data += bit1; + if (i & 4) + data += bit2; + if (i & 8) + data += bit3; + + //logerror(" %3d\n", data); + m_tone_channels[0].form[i] = data - base; + } + + for (i = 0; i < 16; i++) + m_tone_channels[0].form[i] *= 65535 / 16; +} + +void snk6502_sound_device::satansat_build_waveform(int mask) +{ + int bit0, bit1, bit2, bit3; + int base; + int i; + + mask &= 7; + + //logerror("1: wave form = %d\n", mask); + bit0 = bit1 = bit2 = 1; + bit3 = 0; + + if (mask & 1) + bit3 = 1; + + base = (bit0 + bit1 + bit2 + bit3 + 1) / 2; + + for (i = 0; i < 16; i++) + { + int data = 0; + + if (i & 1) + data += bit0; + if (i & 2) + data += bit1; + if (i & 4) + data += bit2; + if (i & 8) + data += bit3; + + //logerror(" %3d\n", data); + m_tone_channels[1].form[i] = data - base; + } + + for (i = 0; i < 16; i++) + m_tone_channels[1].form[i] *= 65535 / 16; +} + +void snk6502_sound_device::build_waveform(int channel, int mask) +{ + int bit0, bit1, bit2, bit3; + int base; + int i; + + mask &= 15; + + //logerror("%d: wave form = %d\n", channel, mask); + bit0 = bit1 = bit2 = bit3 = 0; + + // bit 3 + if (mask & (1 | 2)) + bit3 = 8; + else if (mask & 4) + bit3 = 4; + else if (mask & 8) + bit3 = 2; + + // bit 2 + if (mask & 4) + bit2 = 8; + else if (mask & (2 | 8)) + bit2 = 4; + + // bit 1 + if (mask & 8) + bit1 = 8; + else if (mask & 4) + bit1 = 4; + else if (mask & 2) + bit1 = 2; + + // bit 0 + bit0 = bit1 / 2; + + if (bit0 + bit1 + bit2 + bit3 < 16) + { + bit0 *= 2; + bit1 *= 2; + bit2 *= 2; + bit3 *= 2; + } + + base = (bit0 + bit1 + bit2 + bit3 + 1) / 2; + + for (i = 0; i < 16; i++) + { + /* special channel for fantasy */ + if (channel == 2) + { + m_tone_channels[channel].form[i] = (i & 8) ? 7 : -8; + } + else + { + int data = 0; + + if (i & 1) + data += bit0; + if (i & 2) + data += bit1; + if (i & 4) + data += bit2; + if (i & 8) + data += bit3; + + //logerror(" %3d\n", data); + m_tone_channels[channel].form[i] = data - base; + } + } + + for (i = 0; i < 16; i++) + m_tone_channels[channel].form[i] *= 65535 / 160; +} + +void snk6502_sound_device::set_music_freq(int freq) +{ + int i; + + for (i = 0; i < CHANNELS; i++) + { + m_tone_channels[i].mute = 1; + m_tone_channels[i].offset = 0; + m_tone_channels[i].base = i * 0x800; + m_tone_channels[i].mask = 0xff; + m_tone_channels[i].sample_step = 0; + m_tone_channels[i].sample_cur = 0; + m_tone_channels[i].sample_rate = (double)(freq * 8) / SAMPLE_RATE * FRAC_ONE; + + build_waveform(i, 1); + } +} + +void snk6502_sound_device::set_music_clock(double clock_time) +{ + m_tone_clock_expire = clock_time * SAMPLE_RATE * FRAC_ONE; + m_tone_clock = 0; +} + +int snk6502_sound_device::music0_playing() +{ + return m_tone_channels[0].mute; +} + + +WRITE8_MEMBER( snk6502_sound_device::sasuke_sound_w ) +{ + switch (offset) + { + case 0: + /* + bit description + + 0 hit (ic52) + 1 boss start (ic51) + 2 shot + 3 boss attack (ic48?) + 4 ?? + 5 + 6 + 7 reset counter + */ + + if ((~data & 0x01) && (m_LastPort1 & 0x01)) + m_samples->start(0, 0); + if ((~data & 0x02) && (m_LastPort1 & 0x02)) + m_samples->start(1, 1); + if ((~data & 0x04) && (m_LastPort1 & 0x04)) + m_samples->start(2, 2); + if ((~data & 0x08) && (m_LastPort1 & 0x08)) + m_samples->start(3, 3); + + if ((data & 0x80) && (~m_LastPort1 & 0x80)) + { + m_tone_channels[0].offset = 0; + m_tone_channels[0].mute = 0; + } + + if ((~data & 0x80) && (m_LastPort1 & 0x80)) + m_tone_channels[0].mute = 1; + + m_LastPort1 = data; + break; + + case 1: + /* + bit description + + 0 + 1 wave form + 2 wave form + 3 wave form + 4 MUSIC A8 + 5 MUSIC A9 + 6 MUSIC A10 + 7 + */ + + /* select tune in ROM based on sound command byte */ + m_tone_channels[0].base = 0x0000 + ((data & 0x70) << 4); + m_tone_channels[0].mask = 0xff; + + m_Sound0StopOnRollover = 1; + + /* bit 1-3 sound0 waveform control */ + sasuke_build_waveform((data & 0x0e) >> 1); + break; + } +} + +WRITE8_MEMBER( snk6502_sound_device::satansat_sound_w ) +{ + switch (offset) + { + case 0: + /* + bit description + + */ + + /* bit 0 = analog sound trigger */ + + /* bit 1 = to 76477 */ + + /* bit 2 = analog sound trigger */ + if (data & 0x04 && !(m_LastPort1 & 0x04)) + m_samples->start(0, 1); + + if (data & 0x08) + { + m_tone_channels[0].mute = 1; + m_tone_channels[0].offset = 0; + } + + /* bit 4-6 sound0 waveform control */ + sasuke_build_waveform((data & 0x70) >> 4); + + /* bit 7 sound1 waveform control */ + satansat_build_waveform((data & 0x80) >> 7); + + m_LastPort1 = data; + break; + case 1: + /* + bit description + + */ + + /* select tune in ROM based on sound command byte */ + m_tone_channels[0].base = 0x0000 + ((data & 0x0e) << 7); + m_tone_channels[0].mask = 0xff; + m_tone_channels[1].base = 0x0800 + ((data & 0x60) << 4); + m_tone_channels[1].mask = 0x1ff; + + m_Sound0StopOnRollover = 1; + + if (data & 0x01) + m_tone_channels[0].mute = 0; + + if (data & 0x10) + m_tone_channels[1].mute = 0; + else + { + m_tone_channels[1].mute = 1; + m_tone_channels[1].offset = 0; + } + + /* bit 7 = ? */ + break; + } +} + +WRITE8_MEMBER( snk6502_sound_device::vanguard_sound_w ) +{ + switch (offset) + { + case 0: + /* + bit description + + 0 MUSIC A10 + 1 MUSIC A9 + 2 MUSIC A8 + 3 LS05 PORT 1 + 4 LS04 PORT 2 + 5 SHOT A + 6 SHOT B + 7 BOMB + */ + + /* select musical tune in ROM based on sound command byte */ + m_tone_channels[0].base = ((data & 0x07) << 8); + m_tone_channels[0].mask = 0xff; + + m_Sound0StopOnRollover = 1; + + /* play noise samples requested by sound command byte */ + /* SHOT A */ + if (data & 0x20 && !(m_LastPort1 & 0x20)) + m_samples->start(1, 0); + else if (!(data & 0x20) && m_LastPort1 & 0x20) + m_samples->stop(1); + + /* BOMB */ + if (data & 0x80 && !(m_LastPort1 & 0x80)) + m_samples->start(2, 1); + + if (data & 0x08) + { + m_tone_channels[0].mute = 1; + m_tone_channels[0].offset = 0; + } + + if (data & 0x10) + { + m_tone_channels[0].mute = 0; + } + + /* SHOT B */ + machine().device<sn76477_device>("sn76477.2")->enable_w((data & 0x40) ? 0 : 1); + + m_LastPort1 = data; + break; + case 1: + /* + bit description + + 0 MUSIC A10 + 1 MUSIC A9 + 2 MUSIC A8 + 3 LS04 PORT 3 + 4 EXTP A (HD38880 external pitch control A) + 5 EXTP B (HD38880 external pitch control B) + 6 + 7 + */ + + /* select tune in ROM based on sound command byte */ + m_tone_channels[1].base = 0x0800 + ((data & 0x07) << 8); + m_tone_channels[1].mask = 0xff; + + if (data & 0x08) + m_tone_channels[1].mute = 0; + else + { + m_tone_channels[1].mute = 1; + m_tone_channels[1].offset = 0; + } + break; + case 2: + /* + bit description + + 0 AS 1 (sound0 waveform) + 1 AS 2 (sound0 waveform) + 2 AS 4 (sound0 waveform) + 3 AS 3 (sound0 waveform) + 4 AS 5 (sound1 waveform) + 5 AS 6 (sound1 waveform) + 6 AS 7 (sound1 waveform) + 7 AS 8 (sound1 waveform) + */ + + build_waveform(0, (data & 0x3) | ((data & 4) << 1) | ((data & 8) >> 1)); + build_waveform(1, data >> 4); + } +} + +WRITE8_MEMBER( snk6502_sound_device::fantasy_sound_w ) +{ + switch (offset) + { + case 0: + /* + bit description + + 0 MUSIC A10 + 1 MUSIC A9 + 2 MUSIC A8 + 3 LS04 PART 1 + 4 LS04 PART 2 + 5 + 6 + 7 BOMB + */ + + /* select musical tune in ROM based on sound command byte */ + m_tone_channels[0].base = 0x0000 + ((data & 0x07) << 8); + m_tone_channels[0].mask = 0xff; + + m_Sound0StopOnRollover = 0; + + if (data & 0x08) + m_tone_channels[0].mute = 0; + else + { + m_tone_channels[0].offset = m_tone_channels[0].base; + m_tone_channels[0].mute = 1; + } + + if (data & 0x10) + m_tone_channels[2].mute = 0; + else + { + m_tone_channels[2].offset = 0; + m_tone_channels[2].mute = 1; + } + + /* BOMB */ + machine().device<discrete_device>("discrete")->write(space, FANTASY_BOMB_EN, data & 0x80); + + m_LastPort1 = data; + break; + case 1: + /* + bit description + + 0 MUSIC A10 + 1 MUSIC A9 + 2 MUSIC A8 + 3 LS04 PART 3 + 4 EXT PA (HD38880 external pitch control A) + 5 EXT PB (HD38880 external pitch control B) + 6 + 7 + */ + + /* select tune in ROM based on sound command byte */ + m_tone_channels[1].base = 0x0800 + ((data & 0x07) << 8); + m_tone_channels[1].mask = 0xff; + + if (data & 0x08) + m_tone_channels[1].mute = 0; + else + { + m_tone_channels[1].mute = 1; + m_tone_channels[1].offset = 0; + } + break; + case 2: + /* + bit description + + 0 AS 1 (sound0 waveform) + 1 AS 3 (sound0 waveform) + 2 AS 2 (sound0 waveform) + 3 AS 4 (sound0 waveform) + 4 AS 5 (sound1 waveform) + 5 AS 6 (sound1 waveform) + 6 AS 7 (sound1 waveform) + 7 AS 8 (sound1 waveform) + */ + + build_waveform(0, (data & 0x9) | ((data & 2) << 1) | ((data & 4) >> 1)); + build_waveform(1, data >> 4); + break; + case 3: + /* + bit description + + 0 BC 1 + 1 BC 2 + 2 BC 3 + 3 MUSIC A10 + 4 MUSIC A9 + 5 MUSIC A8 + 6 + 7 INV + */ + + /* select tune in ROM based on sound command byte */ + m_tone_channels[2].base = 0x1000 + ((data & 0x70) << 4); + m_tone_channels[2].mask = 0xff; + snk6502_state *drvstate = space.machine().driver_data<snk6502_state>(); + drvstate->flipscreen_w(space, 0, data); + break; + } +} + + +/* + Hitachi HD38880 speech synthesizer chip + + I heard that this chip uses PARCOR coefficients but I don't know ROM data format. + How do I generate samples? +*/ + + +/* HD38880 command */ +#define HD38880_ADSET 2 +#define HD38880_READ 3 +#define HD38880_INT1 4 +#define HD38880_INT2 6 +#define HD38880_SYSPD 8 +#define HD38880_STOP 10 +#define HD38880_CONDT 11 +#define HD38880_START 12 +#define HD38880_SSTART 14 + +/* HD38880 control bits */ +#define HD38880_CTP 0x10 +#define HD38880_CMV 0x20 +#define HD68880_SYBS 0x0f + + +void snk6502_sound_device::speech_w(UINT8 data, const UINT16 *table, int start) +{ + /* + bit description + 0 SYBS1 + 1 SYBS2 + 2 SYBS3 + 3 SYBS4 + 4 CTP + 5 CMV + 6 + 7 + */ + + if ((data & HD38880_CTP) && (data & HD38880_CMV)) + { + data &= HD68880_SYBS; + + switch (m_hd38880_cmd) + { + case 0: + switch (data) + { + case HD38880_START: + logerror("speech: START\n"); + + if (m_hd38880_data_bytes == 5 && !m_samples->playing(0)) + { + int i; + + for (i = 0; i < 16; i++) + { + if (table[i] && table[i] == m_hd38880_addr) + { + m_samples->start(0, start + i); + break; + } + } + } + break; + + case HD38880_SSTART: + logerror("speech: SSTART\n"); + break; + + case HD38880_STOP: + m_samples->stop(0); + logerror("speech: STOP\n"); + break; + + case HD38880_SYSPD: + m_hd38880_cmd = data; + break; + + case HD38880_CONDT: + logerror("speech: CONDT\n"); + break; + + case HD38880_ADSET: + m_hd38880_cmd = data; + m_hd38880_addr = 0; + m_hd38880_data_bytes = 0; + break; + + case HD38880_READ: + logerror("speech: READ\n"); + break; + + case HD38880_INT1: + m_hd38880_cmd = data; + break; + + case HD38880_INT2: + m_hd38880_cmd = data; + break; + + case 0: + // ignore it + break; + + default: + logerror("speech: unknown command: 0x%x\n", data); + } + break; + + case HD38880_INT1: + logerror("speech: INT1: 0x%x\n", data); + + if (data & 8) + logerror("speech: triangular waveform\n"); + else + logerror("speech: impulse waveform\n"); + + logerror("speech: %sable losing effect of vocal tract\n", data & 4 ? "en" : "dis"); + + if ((data & 2) && (data & 8)) + logerror("speech: use external pitch control\n"); + + m_hd38880_cmd = 0; + break; + + case HD38880_INT2: + logerror("speech: INT2: 0x%x\n", data); + + logerror("speech: %d bits / frame\n", data & 8 ? 48 : 96); + logerror("speech: %d ms / frame\n", data & 4 ? 20 : 10); + logerror("speech: %sable repeat\n", data & 2 ? "en" : "dis"); + logerror("speech: %d operations\n", ((data & 8) == 0) || (data & 1) ? 10 : 8); + + m_hd38880_cmd = 0; + break; + + case HD38880_SYSPD: + m_hd38880_speed = ((double)(data + 1)) / 10.0; + logerror("speech: SYSPD: %1.1f\n", m_hd38880_speed); + m_hd38880_cmd = 0; + break; + + case HD38880_ADSET: + m_hd38880_addr |= (data << (m_hd38880_data_bytes++ * 4)); + if (m_hd38880_data_bytes == 5) + { + logerror("speech: ADSET: 0x%05x\n", m_hd38880_addr); + m_hd38880_cmd = 0; + } + break; + } + } +} + + +/* + vanguard/fantasy speech + + ROM data format (INT2 = 0xf): + 48 bits / frame + 20 ms / frame + enable repeat + 10 operations +*/ + +WRITE8_MEMBER( snk6502_sound_device::vanguard_speech_w ) +{ + static const UINT16 vanguard_table[16] = + { + 0x04000, + 0x04325, + 0x044a2, + 0x045b7, + 0x046ee, + 0x04838, + 0x04984, + 0x04b01, + 0x04c38, + 0x04de6, + 0x04f43, + 0x05048, + 0x05160, + 0x05289, + 0x0539e, + 0x054ce + }; + + speech_w(data, vanguard_table, 2); +} + +WRITE8_MEMBER( snk6502_sound_device::fantasy_speech_w ) +{ + static const UINT16 fantasy_table[16] = + { + 0x04000, + 0x04297, + 0x044b6, + 0x04682, + 0x04927, + 0x04be0, + 0x04cc2, + 0x04e36, + 0x05000, + 0x05163, + 0x052c9, + 0x053fd, + 0, + 0, + 0, + 0 + }; + + speech_w(data, fantasy_table, 0); +} + +//------------------------------------------------- +// sound_stream_update - handle a stream update +//------------------------------------------------- + +void snk6502_sound_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) +{ + stream_sample_t *buffer = outputs[0]; + + int i; + + for (i = 0; i < CHANNELS; i++) + validate_tone_channel(i); + + while (samples-- > 0) + { + INT32 data = 0; + + for (i = 0; i < CHANNELS; i++) + { + TONE *voice = &m_tone_channels[i]; + INT16 *form = voice->form; + + if (!voice->mute && voice->sample_step) + { + int cur_pos = voice->sample_cur + voice->sample_step; + int prev = form[(voice->sample_cur >> FRAC_BITS) & 15]; + int cur = form[(cur_pos >> FRAC_BITS) & 15]; + + /* interpolate */ + data += ((INT32)prev * (FRAC_ONE - (cur_pos & FRAC_MASK)) + + (INT32)cur * (cur_pos & FRAC_MASK)) >> FRAC_BITS; + + voice->sample_cur = cur_pos; + } + } + + *buffer++ = data; + + m_tone_clock += FRAC_ONE; + if (m_tone_clock >= m_tone_clock_expire) + { + for (i = 0; i < CHANNELS; i++) + { + m_tone_channels[i].offset++; + m_tone_channels[i].offset &= m_tone_channels[i].mask; + + validate_tone_channel(i); + } + + if (m_tone_channels[0].offset == 0 && m_Sound0StopOnRollover) + m_tone_channels[0].mute = 1; + + m_tone_clock -= m_tone_clock_expire; + } + + } +} |