void system_reset(void)
{
cpu_reset();
vdp_reset();
sms_reset();
render_reset();
system_load_sram();
if(snd.enabled)
{
OPLL_reset(opll) ;
OPLL_reset_patch(opll,0) ; /* if use default voice data. */
}
}
void FM_Reset(void)
{
switch(snd.fm_which)
{
case SND_EMU2413:
OPLL_reset(opll);
OPLL_reset_patch(opll, 0);
break;
case SND_YM2413:
YM2413ResetChip(0);
break;
}
}
void audio_init(int rate)
{
/* Clear sound context */
memset(&snd, 0, sizeof(t_snd));
/* Reset logging data */
snd.log = 0;
snd.callback = NULL;
/* Oops.. sound is disabled */
if(!rate) return;
/* Calculate buffer size in samples */
snd.bufsize = (rate / 60);
/* Sound output */
snd.buffer[0] = (signed short int *)malloc(snd.bufsize * 2);
snd.buffer[1] = (signed short int *)malloc(snd.bufsize * 2);
if(!snd.buffer[0] || !snd.buffer[1]) return;
memset(snd.buffer[0], 0, snd.bufsize * 2);
memset(snd.buffer[1], 0, snd.bufsize * 2);
/* YM2413 sound stream */
snd.fm_buffer = (signed short int *)malloc(snd.bufsize * 2);
if(!snd.fm_buffer) return;
memset(snd.fm_buffer, 0, snd.bufsize * 2);
/* SN76489 sound stream */
snd.psg_buffer[0] = (signed short int *)malloc(snd.bufsize * 2);
snd.psg_buffer[1] = (signed short int *)malloc(snd.bufsize * 2);
if(!snd.psg_buffer[0] || !snd.psg_buffer[1]) return;
memset(snd.psg_buffer[0], 0, snd.bufsize * 2);
memset(snd.psg_buffer[1], 0, snd.bufsize * 2);
/* Set up SN76489 emulation */
SN76496_init(0, MASTER_CLOCK, 255, rate);
/* Set up YM2413 emulation */
OPLL_init(3579545, rate) ;
opll = OPLL_new() ;
OPLL_reset(opll) ;
OPLL_reset_patch(opll,0) ; /* if use default voice data. */
/* Inform other functions that we can use sound */
snd.enabled = 1;
}
void FM_Init(void)
{
switch(snd.fm_which)
{
case SND_EMU2413:
OPLL_init(snd.fm_clock, snd.sample_rate);
opll = OPLL_new();
OPLL_reset(opll);
OPLL_reset_patch(opll, 0);
break;
case SND_YM2413:
YM2413Init(1, snd.fm_clock, snd.sample_rate);
YM2413ResetChip(0);
break;
}
}
void system_load_state(void *fd)
{
int i;
uint8 reg[0x40];
/* Initialize everything */
cpu_reset();
system_reset();
/* Load VDP context */
fread(&vdp, sizeof(t_vdp), 1, fd);
/* Load SMS context */
fread(&sms, sizeof(t_sms), 1, fd);
/* Load Z80 context */
fread(Z80_Context, sizeof(Z80_Regs), 1, fd);
fread(&after_EI, sizeof(int), 1, fd);
/* Load YM2413 registers */
fread(reg, 0x40, 1, fd);
/* Load SN76489 context */
fread(&sn[0], sizeof(t_SN76496), 1, fd);
/* Restore callbacks */
z80_set_irq_callback(sms_irq_callback);
cpu_readmap[0] = cart.rom + 0x0000; /* 0000-3FFF */
cpu_readmap[1] = cart.rom + 0x2000;
cpu_readmap[2] = cart.rom + 0x4000; /* 4000-7FFF */
cpu_readmap[3] = cart.rom + 0x6000;
cpu_readmap[4] = cart.rom + 0x0000; /* 0000-3FFF */
cpu_readmap[5] = cart.rom + 0x2000;
cpu_readmap[6] = sms.ram;
cpu_readmap[7] = sms.ram;
cpu_writemap[0] = sms.dummy;
cpu_writemap[1] = sms.dummy;
cpu_writemap[2] = sms.dummy;
cpu_writemap[3] = sms.dummy;
cpu_writemap[4] = sms.dummy;
cpu_writemap[5] = sms.dummy;
cpu_writemap[6] = sms.ram;
cpu_writemap[7] = sms.ram;
sms_mapper_w(3, sms.fcr[3]);
sms_mapper_w(2, sms.fcr[2]);
sms_mapper_w(1, sms.fcr[1]);
sms_mapper_w(0, sms.fcr[0]);
/* Force full pattern cache update */
is_vram_dirty = 1;
memset(vram_dirty, 1, 0x200);
/* Restore palette */
for(i = 0; i < PALETTE_SIZE; i += 1)
palette_sync(i);
/* Restore sound state */
if(snd.enabled)
{
/* Clear YM2413 context */
OPLL_reset(opll) ;
OPLL_reset_patch(opll,0) ; /* if use default voice data. */
/* Restore rhythm enable first */
ym2413_write(0, 0, 0x0E);
ym2413_write(0, 1, reg[0x0E]);
/* User instrument settings */
for(i = 0x00; i <= 0x07; i += 1)
{
ym2413_write(0, 0, i);
ym2413_write(0, 1, reg[i]);
}
/* Channel frequency */
for(i = 0x10; i <= 0x18; i += 1)
{
ym2413_write(0, 0, i);
ym2413_write(0, 1, reg[i]);
}
/* Channel frequency + ctrl. */
for(i = 0x20; i <= 0x28; i += 1)
{
ym2413_write(0, 0, i);
ym2413_write(0, 1, reg[i]);
}
/* Instrument and volume settings */
for(i = 0x30; i <= 0x38; i += 1)
{
ym2413_write(0, 0, i);
ym2413_write(0, 1, reg[i]);
}
}
}
