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fmtowns: fix cdda gain (nw)

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This commit is contained in:
cracyc 2020-02-05 20:11:55 -06:00
parent 1a5ac25f61
commit 9d20182474
1 changed files with 6 additions and 5 deletions
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11
src/mame/drivers/fmtowns.cpp
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@ -2061,12 +2061,13 @@ READ8_MEMBER(towns_state::towns_volume_r)
void towns_state::cdda_db_to_gain(float db) void towns_state::cdda_db_to_gain(float db)
{ {
float gain = powf(10, db / 20); float gain = powf(10, db / 20.0f);
int port = m_towns_volume_select & 3; int port = m_towns_volume_select & 3;
if(port > 1) if(port > 1)
return; return;
if(db == -1) if(db > 0)
gain = 0; gain = 0;
logerror("port %d gain %f db %f\n", port, gain, db);
m_cdda->set_output_gain(port, gain); m_cdda->set_output_gain(port, gain);
} }
@ -2075,15 +2076,15 @@ WRITE8_MEMBER(towns_state::towns_volume_w)
switch(offset) switch(offset)
{ {
case 2: case 2:
m_towns_volume[m_towns_volume_select & 3] = data;
if(!(m_towns_volume_select & 4) || (m_towns_volume_select & 0x18)) if(!(m_towns_volume_select & 4) || (m_towns_volume_select & 0x18))
return; return;
m_towns_volume[m_towns_volume_select & 3] = data; cdda_db_to_gain((~data & 0x3f) * -0.5f);
cdda_db_to_gain(~(data & 0x3f) * -0.5f);
break; break;
case 3: // select channel case 3: // select channel
m_towns_volume_select = data; m_towns_volume_select = data;
if(!(data & 4)) if(!(data & 4))
cdda_db_to_gain(-1); cdda_db_to_gain(1);
else if(data & 8) else if(data & 8)
cdda_db_to_gain(0); cdda_db_to_gain(0);
else if(data & 0x10) else if(data & 0x10)