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regs 5/7 high bytes are for stereo panning

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This commit is contained in:
Michaël Banaan Ananas 2014-02-19 00:21:44 +00:00
parent 5f6f08af1f
commit 0945648037
2 changed files with 10 additions and 2 deletions
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10
src/emu/sound/zsg2.c
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@ -48,6 +48,8 @@ Emulation is still preliminary.
TODO:
- channel volume, 16bits?? need to make a lookup table?
- how does panning work? it is not simply left/right volume
- (some) samples are in stereo format?
- memory reads out of range sometimes
- a lot of unknowns
@ -109,6 +111,8 @@ void zsg2_device::device_start()
save_item(NAME(m_chan[ch].loop_pos), ch);
save_item(NAME(m_chan[ch].page), ch);
save_item(NAME(m_chan[ch].vol), ch);
save_item(NAME(m_chan[ch].panl), ch);
save_item(NAME(m_chan[ch].panr), ch);
}
}
@ -255,8 +259,9 @@ void zsg2_device::chan_w(int ch, int reg, UINT16 data)
case 0x5:
// lo byte: loop address low
// hi byte: ?
// hi byte: right(?) panning (high bits always 0)
m_chan[ch].loop_pos = (m_chan[ch].loop_pos & 0xff00) | (data & 0xff);
m_chan[ch].panr = data >> 8 & 0x1f;
break;
case 0x6:
@ -266,8 +271,9 @@ void zsg2_device::chan_w(int ch, int reg, UINT16 data)
case 0x7:
// lo byte: loop address high
// hi byte: ?
// hi byte: left(?) panning (high bits always 0)
m_chan[ch].loop_pos = (m_chan[ch].loop_pos & 0x00ff) | (data << 8 & 0xff00);
m_chan[ch].panl = data >> 8 & 0x1f;
break;
case 0xb:

2
src/emu/sound/zsg2.h
View File

@ -59,6 +59,8 @@ private:
UINT32 loop_pos;
UINT32 page;
UINT16 vol;
UINT8 panl;
UINT8 panr;
};
zchan m_chan[48];