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Merge pull request #470 from cam900/patch-11

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Fix AY8910 envelope divider
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tildearrow 2022-05-16 21:26:29 -05:00 committed by GitHub
commit e06e65bfa6
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1 changed files with 2 additions and 3 deletions
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5
src/engine/platform/sound/ay8910.cpp
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@ -1061,9 +1061,8 @@ void ay8910_device::sound_stream_update(short** outputs, int outLen)
for (int chan = 0; chan < NUM_CHANNELS; chan++) for (int chan = 0; chan < NUM_CHANNELS; chan++)
{ {
tone = &m_tone[chan]; tone = &m_tone[chan];
const int period = tone->period * (m_step_mul << 1); 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); tone->count += is_expanded_mode() ? 32 : ((m_feature & PSG_HAS_EXPANDED_MODE) ? 1 : 2);
if (period==0) continue;
while (tone->count >= period) while (tone->count >= period)
{ {
tone->duty_cycle = (tone->duty_cycle - 1) & 0x1f; tone->duty_cycle = (tone->duty_cycle - 1) & 0x1f;
@ -1116,7 +1115,7 @@ void ay8910_device::sound_stream_update(short** outputs, int outLen)
envelope = &m_envelope[chan]; envelope = &m_envelope[chan];
if (envelope->holding == 0) if (envelope->holding == 0)
{ {
const int period = envelope->period * m_env_step_mul; const int period = std::max<int>(1, envelope->period) * m_env_step_mul;
if ((++envelope->count) >= period) if ((++envelope->count) >= period)
{ {
envelope->count = 0; envelope->count = 0;