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c6280.cpp : Fix LFO scale bit

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cam900 2018-10-28 12:24:57 +09:00 committed by GitHub
parent 82501770de
commit 4069f1d054
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1 changed files with 1 additions and 1 deletions
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src/devices/sound/c6280.cpp
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@ -134,7 +134,7 @@ void c6280_device::sound_stream_update(sound_stream &stream, stream_sample_t **i
m_channel[1].m_counter &= 0x1FFFF;
lfo_data = m_channel[1].m_waveform[lfooffset];
if (m_lfo_control & 3)
step += ((lfo_data - 16) << ((m_lfo_control-1)<<1)); // verified from patent, TODO : same in real hardware?
step += ((lfo_data - 16) << (((m_lfo_control & 3)-1)<<1)); // verified from patent, TODO : same in real hardware?
offset = (m_channel[0].m_counter >> 12) & 0x1F;
m_channel[0].m_counter += m_wave_freq_tab[step & 0xfff];