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Fix divider again, split tone and envelope clock divider

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This commit is contained in:
cam900 2022-05-07 23:00:22 +09:00
parent 234f418f65
commit 0b0a6dbf28
3 changed files with 21 additions and 17 deletions
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4
src/engine/platform/ay8930.cpp
View file

@ -27,7 +27,7 @@
#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
#define immWrite2(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define CHIP_DIVIDER 8
#define CHIP_DIVIDER (clockSel?8:4)
const char* regCheatSheetAY8930[]={
"FreqL_A", "00",
@ -651,7 +651,7 @@ void DivPlatformAY8930::setFlags(unsigned int flags) {
chipClock=COLOR_NTSC/2.0;
break;
}
rate=chipClock/8;
rate=chipClock/4;
for (int i=0; i<3; i++) {
oscBuf[i]->rate=rate;
}

20
src/engine/platform/sound/ay8910.cpp
View file

@ -1061,8 +1061,8 @@ void ay8910_device::sound_stream_update(short** outputs, int outLen)
for (int chan = 0; chan < NUM_CHANNELS; chan++)
{
tone = &m_tone[chan];
const int period = std::max<int>(1,tone->period) << 1;
tone->count += is_expanded_mode() ? 32 : (is_clock_divided() ? 1 : 2);
const int period = std::max<int>(1,tone->period) * (m_step_mul << 1);
tone->count += is_expanded_mode() ? 32 : ((m_feature & PSG_HAS_EXPANDED_MODE) ? 1 : 2);
while (tone->count >= period)
{
tone->duty_cycle = (tone->duty_cycle - 1) & 0x1f;
@ -1071,13 +1071,14 @@ void ay8910_device::sound_stream_update(short** outputs, int outLen)
}
}
if ((++m_count_noise) >= noise_period())
const int period_noise = noise_period() * m_step_mul;
if ((++m_count_noise) >= period_noise)
{
/* toggle the prescaler output. Noise is no different to
* channels.
*/
m_count_noise = 0;
m_prescale_noise = (m_prescale_noise + 1) & (is_clock_divided() ? 3 : 1);
m_prescale_noise = (m_prescale_noise + 1) & ((m_feature & PSG_HAS_EXPANDED_MODE) ? 3 : 1);
if (is_expanded_mode()) // AY8930 noise generator rate is twice? compares as compatibility mode
{
@ -1114,7 +1115,7 @@ void ay8910_device::sound_stream_update(short** outputs, int outLen)
envelope = &m_envelope[chan];
if (envelope->holding == 0)
{
const int period = envelope->period * m_step;
const int period = envelope->period * m_env_step_mul;
if ((++envelope->count) >= period)
{
envelope->count = 0;
@ -1445,7 +1446,8 @@ ay8910_device::ay8910_device(device_type type, unsigned int clock,
m_noise_out(0),
m_mode(0),
m_env_step_mask((!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? 0x0f : 0x1f),
m_step( (feature & PSG_HAS_INTERNAL_DIVIDER) || (psg_type == PSG_TYPE_AY) ? 2 : 1),
m_step_mul( (feature & PSG_HAS_INTERNAL_DIVIDER) ? 2 : 1),
m_env_step_mul( (!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? (m_step_mul << 1) : m_step_mul),
m_zero_is_off( (!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? 1 : 0),
m_par( (!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? &ay8910_param : &ym2149_param),
m_par_env( (!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? &ay8910_param : &ym2149_param_env),
@ -1470,7 +1472,7 @@ void ay8910_device::set_type(psg_type_t psg_type)
if (psg_type == PSG_TYPE_AY)
{
m_env_step_mask = 0x0f;
m_step = is_clock_divided() ? 4 : 2;
m_env_step_mul = is_clock_divided() ? 4 : 2;
m_zero_is_off = 1;
m_par = &ay8910_param;
m_par_env = &ay8910_param;
@ -1478,11 +1480,13 @@ void ay8910_device::set_type(psg_type_t psg_type)
else
{
m_env_step_mask = 0x1f;
m_step = is_clock_divided() ? 2 : 1;
m_env_step_mul = is_clock_divided() ? 2 : 1;
m_zero_is_off = 0;
m_par = &ym2149_param;
m_par_env = &ym2149_param_env;
}
if (m_feature & PSG_HAS_EXPANDED_MODE)
m_env_step_mul <<= 1;
}

14
src/engine/platform/sound/ay8910.h
View file

@ -105,15 +105,14 @@ public:
if (m_feature & PSG_PIN26_IS_CLKSEL)
{
if (clk_sel)
{
m_flags |= YM2149_PIN26_LOW;
set_type(m_type);
}
else
{
m_flags &= ~YM2149_PIN26_LOW;
set_type(m_type);
}
m_step_mul = is_clock_divided() ? 2 : 1;
m_env_step_mul = (!(m_feature & PSG_HAS_EXPANDED_MODE)) && (m_type == PSG_TYPE_AY) ? (m_step_mul << 1) : m_step_mul;
if (m_feature & PSG_HAS_EXPANDED_MODE)
m_env_step_mul <<= 1;
}
}
@ -332,7 +331,8 @@ private:
unsigned char m_mode;
unsigned char m_env_step_mask;
/* init parameters ... */
int m_step;
int m_step_mul;
int m_env_step_mul;
int m_zero_is_off;
unsigned char m_vol_enabled[NUM_CHANNELS];
const ay_ym_param *m_par;