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AY: optimize

This commit is contained in:
tildearrow 2023-01-12 16:05:03 -05:00
parent b238e9ee6d
commit 51cef18bff
1 changed files with 5 additions and 6 deletions
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11
src/engine/platform/sound/ay8910.cpp
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@ -1064,12 +1064,11 @@ void ay8910_device::sound_stream_update(short** outputs, int outLen)
tone = &m_tone[chan];
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;
tone->output = is_expanded_mode() ? BIT(duty_cycle[tone_duty(tone)], tone->duty_cycle) : BIT(tone->duty_cycle, 0);
tone->count -= period;
}
if (tone->count>=period) {
tone->duty_cycle = (tone->duty_cycle - (tone->count/period)) & 0x1f;
tone->output = is_expanded_mode() ? BIT(duty_cycle[tone_duty(tone)], tone->duty_cycle) : BIT(tone->duty_cycle, 0);
tone->count = tone->count % period;
}
}
const int period_noise = (int)(noise_period()) * m_step_mul;