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Merge pull request #5661 from cam900/ay8910_performance

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ay8910.cpp : Reduce performance issue
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ajrhacker 2019-09-18 16:16:37 -04:00 committed by GitHub
commit d05e7bfa73
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1 changed files with 10 additions and 8 deletions
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18
src/devices/sound/ay8910.cpp
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@ -1125,7 +1125,7 @@ void ay8910_device::sound_stream_update(sound_stream &stream, stream_sample_t **
if (tone->count >= tone->period)
{
tone->duty_cycle = (tone->duty_cycle - 1) & 0x1f;
tone->output = BIT(duty_cycle[tone_duty(tone)], tone->duty_cycle);
tone->output = (m_feature & PSG_HAS_EXPANDED_MODE) ? BIT(duty_cycle[tone_duty(tone)], tone->duty_cycle) : BIT(tone->duty_cycle, 0);
tone->count = 0;
}
}
@ -1147,7 +1147,7 @@ void ay8910_device::sound_stream_update(sound_stream &stream, stream_sample_t **
// TODO : get actually algorithm for AY8930
m_rng ^= (((m_rng & 1) ^ ((m_rng >> 3) & 1)) << 17);
m_rng >>= 1;
m_prescale_noise = 16;
m_prescale_noise = (m_feature & PSG_HAS_EXPANDED_MODE) ? 16 : 1;
}
m_prescale_noise--;
}
@ -1353,7 +1353,7 @@ void ay8910_device::device_start()
/* The envelope is pacing twice as fast for the YM2149 as for the AY-3-8910, */
/* This handled by the step parameter. Consequently we use a multipler of 2 here. */
m_channel = machine().sound().stream_alloc(*this, 0, m_streams, master_clock * 2);
m_channel = machine().sound().stream_alloc(*this, 0, m_streams, (m_feature & PSG_HAS_EXPANDED_MODE) ? master_clock * 2 : master_clock / 8);
ay_set_clock(master_clock);
ay8910_statesave();
@ -1406,9 +1406,9 @@ void ay8910_device::ay_set_clock(int clock)
{
// FIXME: this doesn't belong here, it should be an input pin exposed via devcb
if ((m_feature & PSG_PIN26_IS_CLKSEL) && (m_flags & YM2149_PIN26_LOW))
m_channel->set_sample_rate(clock);
m_channel->set_sample_rate((m_feature & PSG_HAS_EXPANDED_MODE) ? clock : clock / 16);
else
m_channel->set_sample_rate(clock * 2);
m_channel->set_sample_rate((m_feature & PSG_HAS_EXPANDED_MODE) ? clock * 2 : clock / 8);
}
void ay8910_device::device_clock_changed()
@ -1634,7 +1634,7 @@ ay8910_device::ay8910_device(const machine_config &mconfig, device_type type, co
m_rng(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_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? 32 : 16),
m_step( (!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? 2 : 1),
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),
@ -1663,7 +1663,7 @@ void ay8910_device::set_type(psg_type_t psg_type)
if (psg_type == PSG_TYPE_AY)
{
m_env_step_mask = 0x0f;
m_step = 32;
m_step = 2;
m_zero_is_off = 1;
m_par = &ay8910_param;
m_par_env = &ay8910_param;
@ -1671,11 +1671,13 @@ void ay8910_device::set_type(psg_type_t psg_type)
else
{
m_env_step_mask = 0x1f;
m_step = 16;
m_step = 1;
m_zero_is_off = 0;
m_par = &ym2149_param;
m_par_env = &ym2149_param_env;
}
if (m_feature & PSG_HAS_EXPANDED_MODE)
m_step *= 16;
}
DEFINE_DEVICE_TYPE(AY8912, ay8912_device, "ay8912", "AY-3-8912A PSG")