Files
86Box/src/sound/snd_adlibgold.c
2021-03-30 09:46:49 +02:00

852 lines
35 KiB
C

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#include <86box/86box.h>
#include <86box/io.h>
#include <86box/timer.h>
#include <86box/dma.h>
#include <86box/pic.h>
#include <86box/device.h>
#include <86box/nvr.h>
#include <86box/sound.h>
#include <86box/filters.h>
#include <86box/snd_opl.h>
#include <86box/snd_ym7128.h>
typedef struct adgold_t
{
int adgold_irq_status;
uint8_t adgold_eeprom[0x1a];
uint8_t adgold_status;
int adgold_38x_state, adgold_38x_addr;
uint8_t adgold_38x_regs[0x1a];
int adgold_mma_addr;
uint8_t adgold_mma_regs[2][0xe];
int adgold_mma_enable[2];
uint8_t adgold_mma_fifo[2][256];
int adgold_mma_fifo_start[2], adgold_mma_fifo_end[2];
uint8_t adgold_mma_status;
int16_t adgold_mma_out[2];
int adgold_mma_intpos[2];
pc_timer_t adgold_mma_timer_count;
struct
{
int timer0_latch, timer0_count;
int timerbase_latch, timerbase_count;
int timer1_latch, timer1_count;
int timer2_latch, timer2_count, timer2_read;
int voice_count[2], voice_latch[2];
} adgold_mma;
opl_t opl;
ym7128_t ym7128;
int fm_vol_l, fm_vol_r;
int samp_vol_l, samp_vol_r;
int vol_l, vol_r;
int treble, bass;
int16_t opl_buffer[SOUNDBUFLEN * 2];
int16_t mma_buffer[2][SOUNDBUFLEN];
int pos;
int surround_enabled;
} adgold_t;
static int attenuation[0x40];
static int bass_attenuation[0x10] =
{
(int)(1.995 * 16384), /*12 dB - filter output is at +6 dB so we use 6 dB here*/
(int)(1.995 * 16384),
(int)(1.995 * 16384),
(int)(1.413 * 16384), /*9 dB*/
(int)(1 * 16384), /*6 dB*/
(int)(0.708 * 16384), /*3 dB*/
(int)(0 * 16384), /*0 dB*/
(int)(0.708 * 16384), /*3 dB*/
(int)(1 * 16384), /*6 dB*/
(int)(1.413 * 16384), /*9 dB*/
(int)(1.995 * 16384), /*12 dB*/
(int)(2.819 * 16384), /*15 dB*/
(int)(2.819 * 16384),
(int)(2.819 * 16384),
(int)(2.819 * 16384),
(int)(2.819 * 16384)
};
static int bass_cut[6] =
{
(int)(0.126 * 16384), /*-12 dB*/
(int)(0.126 * 16384), /*-12 dB*/
(int)(0.126 * 16384), /*-12 dB*/
(int)(0.178 * 16384), /*-9 dB*/
(int)(0.251 * 16384), /*-6 dB*/
(int)(0.354 * 16384) /*-3 dB - filter output is at +6 dB*/
};
static int treble_attenuation[0x10] =
{
(int)(1.995 * 16384), /*12 dB - filter output is at +6 dB so we use 6 dB here*/
(int)(1.995 * 16384),
(int)(1.995 * 16384),
(int)(1.413 * 16384), /*9 dB*/
(int)(1 * 16384), /*6 dB*/
(int)(0.708 * 16384), /*3 dB*/
(int)(0 * 16384), /*0 dB*/
(int)(0.708 * 16384), /*3 dB*/
(int)(1 * 16384), /*6 dB*/
(int)(1.413 * 16384), /*9 dB*/
(int)(1.995 * 16384), /*12 dB*/
(int)(1.995 * 16384),
(int)(1.995 * 16384),
(int)(1.995 * 16384),
(int)(1.995 * 16384),
(int)(1.995 * 16384)
};
static int treble_cut[6] =
{
(int)(0.126 * 16384), /*-12 dB*/
(int)(0.126 * 16384), /*-12 dB*/
(int)(0.126 * 16384), /*-12 dB*/
(int)(0.178 * 16384), /*-9 dB*/
(int)(0.251 * 16384), /*-6 dB*/
(int)(0.354 * 16384) /*-3 dB - filter output is at +6 dB*/
};
void adgold_timer_poll();
void adgold_update(adgold_t *adgold);
void adgold_update_irq_status(adgold_t *adgold)
{
uint8_t temp = 0xf;
if (!(adgold->adgold_mma_regs[0][8] & 0x10) && (adgold->adgold_mma_status & 0x10)) /*Timer 0*/
temp &= ~2;
if (!(adgold->adgold_mma_regs[0][8] & 0x20) && (adgold->adgold_mma_status & 0x20)) /*Timer 1*/
temp &= ~2;
if (!(adgold->adgold_mma_regs[0][8] & 0x40) && (adgold->adgold_mma_status & 0x40)) /*Timer 2*/
temp &= ~2;
if ((adgold->adgold_mma_status & 0x01) && !(adgold->adgold_mma_regs[0][0xc] & 2))
temp &= ~2;
if ((adgold->adgold_mma_status & 0x02) && !(adgold->adgold_mma_regs[1][0xc] & 2))
temp &= ~2;
adgold->adgold_status = temp;
if ((adgold->adgold_status ^ 0xf) && !adgold->adgold_irq_status)
{
picint(0x80);
}
adgold->adgold_irq_status = adgold->adgold_status ^ 0xf;
}
void adgold_getsamp_dma(adgold_t *adgold, int channel)
{
int temp;
if ((adgold->adgold_mma_regs[channel][0xc] & 0x60) && (((adgold->adgold_mma_fifo_end[channel] - adgold->adgold_mma_fifo_start[channel]) & 255) >= 127))
return;
temp = dma_channel_read(1);
if (temp == DMA_NODATA) return;
adgold->adgold_mma_fifo[channel][adgold->adgold_mma_fifo_end[channel]] = temp;
adgold->adgold_mma_fifo_end[channel] = (adgold->adgold_mma_fifo_end[channel] + 1) & 255;
if (adgold->adgold_mma_regs[channel][0xc] & 0x60)
{
temp = dma_channel_read(1);
adgold->adgold_mma_fifo[channel][adgold->adgold_mma_fifo_end[channel]] = temp;
adgold->adgold_mma_fifo_end[channel] = (adgold->adgold_mma_fifo_end[channel] + 1) & 255;
}
if (((adgold->adgold_mma_fifo_end[channel] - adgold->adgold_mma_fifo_start[channel]) & 255) >= adgold->adgold_mma_intpos[channel])
{
adgold->adgold_mma_status &= ~(0x01 << channel);
adgold_update_irq_status(adgold);
}
}
void adgold_write(uint16_t addr, uint8_t val, void *p)
{
adgold_t *adgold = (adgold_t *)p;
switch (addr & 7)
{
case 0: case 1:
opl3_write(addr, val, &adgold->opl);
break;
case 2:
if (val == 0xff)
{
adgold->adgold_38x_state = 1;
return;
}
if (val == 0xfe)
{
adgold->adgold_38x_state = 0;
return;
}
if (adgold->adgold_38x_state) /*Write to control chip*/
adgold->adgold_38x_addr = val;
else
opl3_write(addr, val, &adgold->opl);
break;
case 3:
if (adgold->adgold_38x_state)
{
if (adgold->adgold_38x_addr >= 0x19) break;
switch (adgold->adgold_38x_addr)
{
case 0x00: /*Control/ID*/
if (val & 1)
memcpy(adgold->adgold_38x_regs, adgold->adgold_eeprom, 0x1a);
if (val & 2)
memcpy(adgold->adgold_eeprom, adgold->adgold_38x_regs, 0x1a);
break;
case 0x04: /*Final output volume left*/
adgold->adgold_38x_regs[0x04] = val;
adgold->vol_l = attenuation[val & 0x3f];
break;
case 0x05: /*Final output volume right*/
adgold->adgold_38x_regs[0x05] = val;
adgold->vol_r = attenuation[val & 0x3f];
break;
case 0x06: /*Bass*/
adgold->adgold_38x_regs[0x06] = val;
adgold->bass = val & 0xf;
break;
case 0x07: /*Treble*/
adgold->adgold_38x_regs[0x07] = val;
adgold->treble = val & 0xf;
break;
case 0x09: /*FM volume left*/
adgold->adgold_38x_regs[0x09] = val;
adgold->fm_vol_l = (int)(int8_t)(val - 128);
break;
case 0x0a: /*FM volume right*/
adgold->adgold_38x_regs[0x0a] = val;
adgold->fm_vol_r = (int)(int8_t)(val - 128);
break;
case 0x0b: /*Sample volume left*/
adgold->adgold_38x_regs[0x0b] = val;
adgold->samp_vol_l = (int)(int8_t)(val - 128);
break;
case 0x0c: /*Sample volume right*/
adgold->adgold_38x_regs[0x0c] = val;
adgold->samp_vol_r = (int)(int8_t)(val - 128);
break;
case 0x18: /*Surround*/
adgold->adgold_38x_regs[0x18] = val;
ym7128_write(&adgold->ym7128, val);
break;
default:
adgold->adgold_38x_regs[adgold->adgold_38x_addr] = val;
break;
}
}
else
opl3_write(addr, val, &adgold->opl);
break;
case 4: case 6:
adgold->adgold_mma_addr = val;
break;
case 5:
if (adgold->adgold_mma_addr >= 0xf) break;
switch (adgold->adgold_mma_addr)
{
case 0x2:
adgold->adgold_mma.timer0_latch = (adgold->adgold_mma.timer0_latch & 0xff00) | val;
break;
case 0x3:
adgold->adgold_mma.timer0_latch = (adgold->adgold_mma.timer0_latch & 0xff) | (val << 8);
break;
case 0x4:
adgold->adgold_mma.timerbase_latch = (adgold->adgold_mma.timerbase_latch & 0xf00) | val;
break;
case 0x5:
adgold->adgold_mma.timerbase_latch = (adgold->adgold_mma.timerbase_latch & 0xff) | ((val & 0xf) << 8);
adgold->adgold_mma.timer1_latch = val >> 4;
break;
case 0x6:
adgold->adgold_mma.timer2_latch = (adgold->adgold_mma.timer2_latch & 0xff00) | val;
break;
case 0x7:
adgold->adgold_mma.timer2_latch = (adgold->adgold_mma.timer2_latch & 0xff) | (val << 8);
break;
case 0x8:
if ((val & 1) && !(adgold->adgold_mma_regs[0][8] & 1)) /*Reload timer 0*/
adgold->adgold_mma.timer0_count = adgold->adgold_mma.timer0_latch;
if ((val & 2) && !(adgold->adgold_mma_regs[0][8] & 2)) /*Reload timer 1*/
adgold->adgold_mma.timer1_count = adgold->adgold_mma.timer1_latch;
if ((val & 4) && !(adgold->adgold_mma_regs[0][8] & 4)) /*Reload timer 2*/
adgold->adgold_mma.timer2_count = adgold->adgold_mma.timer2_latch;
if ((val & 8) && !(adgold->adgold_mma_regs[0][8] & 8)) /*Reload base timer*/
adgold->adgold_mma.timerbase_count = adgold->adgold_mma.timerbase_latch;
break;
case 0x9:
switch (val & 0x18)
{
case 0x00: adgold->adgold_mma.voice_latch[0] = 12; break; /*44100 Hz*/
case 0x08: adgold->adgold_mma.voice_latch[0] = 24; break; /*22050 Hz*/
case 0x10: adgold->adgold_mma.voice_latch[0] = 48; break; /*11025 Hz*/
case 0x18: adgold->adgold_mma.voice_latch[0] = 72; break; /* 7350 Hz*/
}
if (val & 0x80)
{
adgold->adgold_mma_enable[0] = 0;
adgold->adgold_mma_fifo_end[0] = adgold->adgold_mma_fifo_start[0] = 0;
adgold->adgold_mma_status &= ~0x01;
adgold_update_irq_status(adgold);
}
if ((val & 0x01)) /*Start playback*/
{
if (!(adgold->adgold_mma_regs[0][0x9] & 1))
adgold->adgold_mma.voice_count[0] = adgold->adgold_mma.voice_latch[0];
if (adgold->adgold_mma_regs[0][0xc] & 1)
{
if (adgold->adgold_mma_regs[0][0xc] & 0x80)
{
adgold->adgold_mma_enable[1] = 1;
adgold->adgold_mma.voice_count[1] = adgold->adgold_mma.voice_latch[1];
while (((adgold->adgold_mma_fifo_end[0] - adgold->adgold_mma_fifo_start[0]) & 255) < 128)
{
adgold_getsamp_dma(adgold, 0);
adgold_getsamp_dma(adgold, 1);
}
if (((adgold->adgold_mma_fifo_end[0] - adgold->adgold_mma_fifo_start[0]) & 255) >= adgold->adgold_mma_intpos[0])
{
adgold->adgold_mma_status &= ~0x01;
adgold_update_irq_status(adgold);
}
if (((adgold->adgold_mma_fifo_end[1] - adgold->adgold_mma_fifo_start[1]) & 255) >= adgold->adgold_mma_intpos[1])
{
adgold->adgold_mma_status &= ~0x02;
adgold_update_irq_status(adgold);
}
}
else
{
while (((adgold->adgold_mma_fifo_end[0] - adgold->adgold_mma_fifo_start[0]) & 255) < 128)
{
adgold_getsamp_dma(adgold, 0);
}
if (((adgold->adgold_mma_fifo_end[0] - adgold->adgold_mma_fifo_start[0]) & 255) >= adgold->adgold_mma_intpos[0])
{
adgold->adgold_mma_status &= ~0x01;
adgold_update_irq_status(adgold);
}
}
}
}
adgold->adgold_mma_enable[0] = val & 0x01;
break;
case 0xb:
if (((adgold->adgold_mma_fifo_end[0] - adgold->adgold_mma_fifo_start[0]) & 255) < 128)
{
adgold->adgold_mma_fifo[0][adgold->adgold_mma_fifo_end[0]] = val;
adgold->adgold_mma_fifo_end[0] = (adgold->adgold_mma_fifo_end[0] + 1) & 255;
if (((adgold->adgold_mma_fifo_end[0] - adgold->adgold_mma_fifo_start[0]) & 255) >= adgold->adgold_mma_intpos[0])
{
adgold->adgold_mma_status &= ~0x01;
adgold_update_irq_status(adgold);
}
}
break;
case 0xc:
adgold->adgold_mma_intpos[0] = (7 - ((val >> 2) & 7)) * 8;
break;
}
adgold->adgold_mma_regs[0][adgold->adgold_mma_addr] = val;
break;
case 7:
if (adgold->adgold_mma_addr >= 0xe) break;
switch (adgold->adgold_mma_addr)
{
case 0x9:
adgold_update(adgold);
switch (val & 0x18)
{
case 0x00: adgold->adgold_mma.voice_latch[1] = 12; break; /*44100 Hz*/
case 0x08: adgold->adgold_mma.voice_latch[1] = 24; break; /*22050 Hz*/
case 0x10: adgold->adgold_mma.voice_latch[1] = 48; break; /*11025 Hz*/
case 0x18: adgold->adgold_mma.voice_latch[1] = 72; break; /* 7350 Hz*/
}
if (val & 0x80)
{
adgold->adgold_mma_enable[1] = 0;
adgold->adgold_mma_fifo_end[1] = adgold->adgold_mma_fifo_start[1] = 0;
adgold->adgold_mma_status &= ~0x02;
adgold_update_irq_status(adgold);
}
if ((val & 0x01)) /*Start playback*/
{
if (!(adgold->adgold_mma_regs[1][0x9] & 1))
adgold->adgold_mma.voice_count[1] = adgold->adgold_mma.voice_latch[1];
if (adgold->adgold_mma_regs[1][0xc] & 1)
{
while (((adgold->adgold_mma_fifo_end[1] - adgold->adgold_mma_fifo_start[1]) & 255) < 128)
{
adgold_getsamp_dma(adgold, 1);
}
}
}
adgold->adgold_mma_enable[1] = val & 0x01;
break;
case 0xb:
if (((adgold->adgold_mma_fifo_end[1] - adgold->adgold_mma_fifo_start[1]) & 255) < 128)
{
adgold->adgold_mma_fifo[1][adgold->adgold_mma_fifo_end[1]] = val;
adgold->adgold_mma_fifo_end[1] = (adgold->adgold_mma_fifo_end[1] + 1) & 255;
if (((adgold->adgold_mma_fifo_end[1] - adgold->adgold_mma_fifo_start[1]) & 255) >= adgold->adgold_mma_intpos[1])
{
adgold->adgold_mma_status &= ~0x02;
adgold_update_irq_status(adgold);
}
}
break;
case 0xc:
adgold->adgold_mma_intpos[1] = (7 - ((val >> 2) & 7)) * 8;
break;
}
adgold->adgold_mma_regs[1][adgold->adgold_mma_addr] = val;
break;
}
}
uint8_t adgold_read(uint16_t addr, void *p)
{
adgold_t *adgold = (adgold_t *)p;
uint8_t temp = 0;
switch (addr & 7)
{
case 0: case 1:
temp = opl3_read(addr, &adgold->opl);
break;
case 2:
if (adgold->adgold_38x_state) /*Read from control chip*/
temp = adgold->adgold_status;
else
temp = opl3_read(addr, &adgold->opl);
break;
case 3:
if (adgold->adgold_38x_state)
{
if (adgold->adgold_38x_addr >= 0x19) temp = 0xff;
switch (adgold->adgold_38x_addr)
{
case 0x00: /*Control/ID*/
if (adgold->surround_enabled)
temp = 0x50; /*16-bit ISA, surround module, no telephone/CDROM*/
else
temp = 0x70; /*16-bit ISA, no telephone/surround/CD-ROM*/
break;
default:
temp = adgold->adgold_38x_regs[adgold->adgold_38x_addr];
}
}
else
temp = opl3_read(addr, &adgold->opl);
break;
case 4: case 6:
temp = adgold->adgold_mma_status;
adgold->adgold_mma_status = 0; /*JUKEGOLD expects timer status flags to auto-clear*/
adgold_update_irq_status(adgold);
break;
case 5:
if (adgold->adgold_mma_addr >= 0xf) temp = 0xff;
switch (adgold->adgold_mma_addr)
{
case 6: /*Timer 2 low*/
adgold->adgold_mma.timer2_read = adgold->adgold_mma.timer2_count;
temp = adgold->adgold_mma.timer2_read & 0xff;
break;
case 7: /*Timer 2 high*/
temp = adgold->adgold_mma.timer2_read >> 8;
break;
default:
temp = adgold->adgold_mma_regs[0][adgold->adgold_mma_addr];
break;
}
break;
case 7:
if (adgold->adgold_mma_addr >= 0xf)
temp = 0xff;
else
temp = adgold->adgold_mma_regs[1][adgold->adgold_mma_addr];
break;
}
return temp;
}
void adgold_update(adgold_t *adgold)
{
for (; adgold->pos < sound_pos_global; adgold->pos++)
{
adgold->mma_buffer[0][adgold->pos] = adgold->mma_buffer[1][adgold->pos] = 0;
if (adgold->adgold_mma_regs[0][9] & 0x20)
adgold->mma_buffer[0][adgold->pos] += adgold->adgold_mma_out[0] / 2;
if (adgold->adgold_mma_regs[0][9] & 0x40)
adgold->mma_buffer[1][adgold->pos] += adgold->adgold_mma_out[0] / 2;
if (adgold->adgold_mma_regs[1][9] & 0x20)
adgold->mma_buffer[0][adgold->pos] += adgold->adgold_mma_out[1] / 2;
if (adgold->adgold_mma_regs[1][9] & 0x40)
adgold->mma_buffer[1][adgold->pos] += adgold->adgold_mma_out[1] / 2;
}
}
void adgold_mma_poll(adgold_t *adgold, int channel)
{
int16_t dat;
adgold_update(adgold);
if (adgold->adgold_mma_fifo_start[channel] != adgold->adgold_mma_fifo_end[channel])
{
switch (adgold->adgold_mma_regs[channel][0xc] & 0x60)
{
case 0x00: /*8-bit*/
dat = adgold->adgold_mma_fifo[channel][adgold->adgold_mma_fifo_start[channel]] * 256;
adgold->adgold_mma_out[channel] = dat;
adgold->adgold_mma_fifo_start[channel] = (adgold->adgold_mma_fifo_start[channel] + 1) & 255;
break;
case 0x40: /*12-bit sensible format*/
if (((adgold->adgold_mma_fifo_end[channel] - adgold->adgold_mma_fifo_start[channel]) & 255) < 2)
return;
dat = adgold->adgold_mma_fifo[channel][adgold->adgold_mma_fifo_start[channel]] & 0xf0;
adgold->adgold_mma_fifo_start[channel] = (adgold->adgold_mma_fifo_start[channel] + 1) & 255;
dat |= (adgold->adgold_mma_fifo[channel][adgold->adgold_mma_fifo_start[channel]] << 8);
adgold->adgold_mma_fifo_start[channel] = (adgold->adgold_mma_fifo_start[channel] + 1) & 255;
adgold->adgold_mma_out[channel] = dat;
break;
}
if (adgold->adgold_mma_regs[channel][0xc] & 1)
{
adgold_getsamp_dma(adgold, channel);
}
if (((adgold->adgold_mma_fifo_end[channel] - adgold->adgold_mma_fifo_start[channel]) & 255) < adgold->adgold_mma_intpos[channel] && !(adgold->adgold_mma_status & 0x01))
{
adgold->adgold_mma_status |= 1 << channel;
adgold_update_irq_status(adgold);
}
}
if (adgold->adgold_mma_fifo_start[channel] == adgold->adgold_mma_fifo_end[channel])
{
adgold->adgold_mma_enable[channel] = 0;
}
}
void adgold_timer_poll(void *p)
{
adgold_t *adgold = (adgold_t *)p;
timer_advance_u64(&adgold->adgold_mma_timer_count, (uint64_t)((double)TIMER_USEC * 1.88964));
if (adgold->adgold_mma_regs[0][8] & 0x01) /*Timer 0*/
{
adgold->adgold_mma.timer0_count--;
if (!adgold->adgold_mma.timer0_count)
{
adgold->adgold_mma.timer0_count = adgold->adgold_mma.timer0_latch;
adgold->adgold_mma_status |= 0x10;
adgold_update_irq_status(adgold);
}
}
if (adgold->adgold_mma_regs[0][8] & 0x08) /*Base timer*/
{
adgold->adgold_mma.timerbase_count--;
if (!adgold->adgold_mma.timerbase_count)
{
adgold->adgold_mma.timerbase_count = adgold->adgold_mma.timerbase_latch;
if (adgold->adgold_mma_regs[0][8] & 0x02) /*Timer 1*/
{
adgold->adgold_mma.timer1_count--;
if (!adgold->adgold_mma.timer1_count)
{
adgold->adgold_mma.timer1_count = adgold->adgold_mma.timer1_latch;
adgold->adgold_mma_status |= 0x20;
adgold_update_irq_status(adgold);
}
}
if (adgold->adgold_mma_regs[0][8] & 0x04) /*Timer 2*/
{
adgold->adgold_mma.timer2_count--;
if (!adgold->adgold_mma.timer2_count)
{
adgold->adgold_mma.timer2_count = adgold->adgold_mma.timer2_latch;
adgold->adgold_mma_status |= 0x40;
adgold_update_irq_status(adgold);
}
}
}
}
if (adgold->adgold_mma_enable[0])
{
adgold->adgold_mma.voice_count[0]--;
if (!adgold->adgold_mma.voice_count[0])
{
adgold->adgold_mma.voice_count[0] = adgold->adgold_mma.voice_latch[0];
adgold_mma_poll(adgold, 0);
}
}
if (adgold->adgold_mma_enable[1])
{
adgold->adgold_mma.voice_count[1]--;
if (!adgold->adgold_mma.voice_count[1])
{
adgold->adgold_mma.voice_count[1] = adgold->adgold_mma.voice_latch[1];
adgold_mma_poll(adgold, 1);
}
}
}
static void adgold_get_buffer(int32_t *buffer, int len, void *p)
{
adgold_t *adgold = (adgold_t *)p;
int16_t* adgold_buffer = malloc(sizeof(int16_t) * len * 2);
if (adgold_buffer == NULL) fatal("adgold_buffer = NULL");
int c;
opl3_update(&adgold->opl);
adgold_update(adgold);
for (c = 0; c < len * 2; c += 2)
{
adgold_buffer[c] = ((adgold->opl.buffer[c] * adgold->fm_vol_l) >> 7) / 2;
adgold_buffer[c] += ((adgold->mma_buffer[0][c >> 1] * adgold->samp_vol_l) >> 7) / 4;
adgold_buffer[c+1] = ((adgold->opl.buffer[c+1] * adgold->fm_vol_r) >> 7) / 2;
adgold_buffer[c+1] += ((adgold->mma_buffer[1][c >> 1] * adgold->samp_vol_r) >> 7) / 4;
}
if (adgold->surround_enabled)
ym7128_apply(&adgold->ym7128, adgold_buffer, len);
switch (adgold->adgold_38x_regs[0x8] & 6)
{
case 0:
for (c = 0; c < len * 2; c++)
adgold_buffer[c] = 0;
break;
case 2: /*Left channel only*/
for (c = 0; c < len * 2; c += 2)
adgold_buffer[c+1] = adgold_buffer[c];
break;
case 4: /*Right channel only*/
for (c = 0; c < len * 2; c += 2)
adgold_buffer[c] = adgold_buffer[c+1];
break;
case 6: /*Left and right channels*/
break;
}
switch (adgold->adgold_38x_regs[0x8] & 0x18)
{
case 0x00: /*Forced mono*/
for (c = 0; c < len * 2; c += 2)
adgold_buffer[c] = adgold_buffer[c+1] = ((int32_t)adgold_buffer[c] + (int32_t)adgold_buffer[c+1]) / 2;
break;
case 0x08: /*Linear stereo*/
break;
case 0x10: /*Pseudo stereo*/
/*Filter left channel, leave right channel unchanged*/
/*Filter cutoff is largely a guess*/
for (c = 0; c < len * 2; c += 2)
adgold_buffer[c] += adgold_pseudo_stereo_iir(adgold_buffer[c]);
break;
case 0x18: /*Spatial stereo*/
/*Quite probably wrong, I only have the diagram in the TDA8425 datasheet
and a very vague understanding of how op-amps work to go on*/
for (c = 0; c < len * 2; c += 2)
{
int16_t l = adgold_buffer[c];
int16_t r = adgold_buffer[c+1];
adgold_buffer[c] += (r / 3) + ((l * 2) / 3);
adgold_buffer[c+1] += (l / 3) + ((r * 2) / 3);
}
break;
}
for (c = 0; c < len * 2; c += 2)
{
int32_t temp, lowpass, highpass;
/*Output is deliberately halved to avoid clipping*/
temp = ((int32_t)adgold_buffer[c] * adgold->vol_l) >> 17;
lowpass = adgold_lowpass_iir(0, temp);
highpass = adgold_highpass_iir(0, temp);
if (adgold->bass > 6)
temp += (lowpass * bass_attenuation[adgold->bass]) >> 14;
else if (adgold->bass < 6)
temp = highpass + ((temp * bass_cut[adgold->bass]) >> 14);
if (adgold->treble > 6)
temp += (highpass * treble_attenuation[adgold->treble]) >> 14;
else if (adgold->treble < 6)
temp = lowpass + ((temp * treble_cut[adgold->treble]) >> 14);
if (temp < -32768)
temp = -32768;
if (temp > 32767)
temp = 32767;
buffer[c] += temp;
temp = ((int32_t)adgold_buffer[c+1] * adgold->vol_r) >> 17;
lowpass = adgold_lowpass_iir(1, temp);
highpass = adgold_highpass_iir(1, temp);
if (adgold->bass > 6)
temp += (lowpass * bass_attenuation[adgold->bass]) >> 14;
else if (adgold->bass < 6)
temp = highpass + ((temp * bass_cut[adgold->bass]) >> 14);
if (adgold->treble > 6)
temp += (highpass * treble_attenuation[adgold->treble]) >> 14;
else if (adgold->treble < 6)
temp = lowpass + ((temp * treble_cut[adgold->treble]) >> 14);
if (temp < -32768)
temp = -32768;
if (temp > 32767)
temp = 32767;
buffer[c+1] += temp;
}
adgold->opl.pos = 0;
adgold->pos = 0;
free(adgold_buffer);
}
void *adgold_init(const device_t *info)
{
FILE *f;
int c;
double out;
adgold_t *adgold = malloc(sizeof(adgold_t));
memset(adgold, 0, sizeof(adgold_t));
adgold->surround_enabled = device_get_config_int("surround");
opl3_init(&adgold->opl);
if (adgold->surround_enabled)
ym7128_init(&adgold->ym7128);
out = 65536.0; /*Main volume control ranges from +6 dB to -64 dB in 2 dB steps, then remaining settings are -80 dB (effectively 0)*/
for (c = 0x3f; c >= 0x1c; c--)
{
attenuation[c] = (int)out;
out /= 1.25963; /*2 dB steps*/
}
for (; c >= 0; c--)
attenuation[c] = 0;
f = nvr_fopen("adgold.bin", "rb");
if (f)
{
if (fread(adgold->adgold_eeprom, 1, 0x1a, f) != 0x1a)
fatal("adgold_init(): Error reading data\n");
fclose(f);
}
adgold->adgold_status = 0xf;
adgold->adgold_38x_addr = 0;
adgold->adgold_eeprom[0x13] = 3 | (1 << 4); /*IRQ 7, DMA 1*/
adgold->adgold_eeprom[0x14] = 3 << 4; /*DMA 3*/
adgold->adgold_eeprom[0x15] = 0x388 / 8; /*Present at 388-38f*/
memcpy(adgold->adgold_38x_regs, adgold->adgold_eeprom, 0x19);
adgold->vol_l = attenuation[adgold->adgold_eeprom[0x04] & 0x3f];
adgold->vol_r = attenuation[adgold->adgold_eeprom[0x05] & 0x3f];
adgold->bass = adgold->adgold_eeprom[0x06] & 0xf;
adgold->treble = adgold->adgold_eeprom[0x07] & 0xf;
adgold->fm_vol_l = (int)(int8_t)(adgold->adgold_eeprom[0x09] - 128);
adgold->fm_vol_r = (int)(int8_t)(adgold->adgold_eeprom[0x0a] - 128);
adgold->samp_vol_l = (int)(int8_t)(adgold->adgold_eeprom[0x0b] - 128);
adgold->samp_vol_r = (int)(int8_t)(adgold->adgold_eeprom[0x0c] - 128);
adgold->adgold_mma_enable[0] = 0;
adgold->adgold_mma_fifo_start[0] = adgold->adgold_mma_fifo_end[0] = 0;
/*388/389 are handled by adlib_init*/
io_sethandler(0x0388, 0x0008, adgold_read, NULL, NULL, adgold_write, NULL, NULL, adgold);
timer_add(&adgold->adgold_mma_timer_count, adgold_timer_poll, adgold, 1);
sound_add_handler(adgold_get_buffer, adgold);
return adgold;
}
void adgold_close(void *p)
{
FILE *f;
adgold_t *adgold = (adgold_t *)p;
f = nvr_fopen("adgold.bin", "wb");
if (f)
{
fwrite(adgold->adgold_eeprom, 0x1a, 1, f);
fclose(f);
}
free(adgold);
}
static const device_config_t adgold_config[] =
{
{
"surround", "Surround module", CONFIG_BINARY, "", 1
},
{
"", "", -1
}
};
const device_t adgold_device =
{
"AdLib Gold",
DEVICE_ISA, 0,
adgold_init,
adgold_close,
NULL,
{ NULL },
NULL,
NULL,
adgold_config
};