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Neo Geo: fix an ymfm bug...

This commit is contained in:
tildearrow 2022-01-28 22:28:08 -05:00
parent fe30e09d16
commit 3b95baa60e
1 changed files with 7 additions and 2 deletions
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9
src/engine/platform/sound/ymfm/ymfm_ssg.cpp
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@ -206,9 +206,14 @@ void ssg_engine::output(output_data &output)
// tone depends on the current tone state
uint32_t tone_on = m_regs.ch_tone_enable(chan) & m_tone_state[chan];
// if neither tone nor noise enabled, return 0
// if envelope is enabled but tone and noise aren't, use the envelope
// volume
uint32_t volume;
if ((noise_on | tone_on) == 0)
if (m_regs.ch_envelope_enable(chan) && !m_regs.ch_noise_enable(chan) && !m_regs.ch_tone_enable(chan))
volume = envelope_volume;
// if neither tone nor noise enabled, return 0
else if ((noise_on | tone_on) == 0)
volume = 0;
// if the envelope is enabled, use its amplitude