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iremga20.cpp : Fix frequency update algorithm (#4040)

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* iremga20.cpp : Fix frequency update algorithm

* iremga20.cpp : Fix naming

* iremga20.cpp : Fix method
iremga20.h : Fix value name
This commit is contained in:
cam900 2018-09-30 10:41:34 +09:00 committed by hap
parent b757576f35
commit 51f02ffaf2
2 changed files with 11 additions and 8 deletions
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17
src/devices/sound/iremga20.cpp
View File

@ -80,7 +80,7 @@ void iremga20_device::device_start()
{
save_item(NAME(m_channel[i].rate), i);
save_item(NAME(m_channel[i].pos), i);
save_item(NAME(m_channel[i].frac), i);
save_item(NAME(m_channel[i].counter), i);
save_item(NAME(m_channel[i].end), i);
save_item(NAME(m_channel[i].volume), i);
save_item(NAME(m_channel[i].play), i);
@ -99,7 +99,7 @@ void iremga20_device::device_reset()
{
m_channel[i].rate = 0;
m_channel[i].pos = 0;
m_channel[i].frac = 0;
m_channel[i].counter = 0;
m_channel[i].end = 0;
m_channel[i].volume = 0;
m_channel[i].play = 0;
@ -150,9 +150,12 @@ void iremga20_device::sound_stream_update(sound_stream &stream, stream_sample_t
else
{
sampleout += (sample - 0x80) * (int32_t)ch.volume;
ch.frac += ch.rate;
ch.pos += (ch.frac >> 24);
ch.frac &= ((1 << 24) - 1);
ch.counter--;
if (ch.counter <= ch.rate)
{
ch.pos++;
ch.counter = 0x100;
}
}
}
}
@ -182,7 +185,7 @@ WRITE8_MEMBER( iremga20_device::irem_ga20_w )
switch (offset & 0x7)
{
case 4:
m_channel[ch].rate = (1 << 24) / (256 - data);
m_channel[ch].rate = data;
break;
case 5:
@ -196,7 +199,7 @@ WRITE8_MEMBER( iremga20_device::irem_ga20_w )
m_channel[ch].play = 1;
m_channel[ch].pos = (m_regs[ch << 3 | 0] | m_regs[ch << 3 | 1] << 8) << 4;
m_channel[ch].end = (m_regs[ch << 3 | 2] | m_regs[ch << 3 | 3] << 8) << 4;
m_channel[ch].frac = 0;
m_channel[ch].counter = 0x100;
}
else
m_channel[ch].play = 0;

2
src/devices/sound/iremga20.h
View File

@ -45,7 +45,7 @@ private:
{
uint32_t rate;
uint32_t pos;
uint32_t frac;
uint32_t counter;
uint32_t end;
uint32_t volume;
uint32_t play;