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ymf278b.cpp : Allow scaling for FM DO2 output

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ymf262.cpp : Add notes
This commit is contained in:
cam900 2019-10-14 10:39:35 +09:00
parent 5e01f764ad
commit f858e1650f
2 changed files with 12 additions and 5 deletions
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9
src/devices/sound/ymf262.cpp
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@ -2615,16 +2615,15 @@ void ymf262_update_one(void *_chip, OPL3SAMPLE **buffers, int length)
signed int *chanout = chip->chanout;
uint8_t rhythm = chip->rhythm&0x20;
OPL3SAMPLE *ch_a = buffers[0];
OPL3SAMPLE *ch_b = buffers[1];
OPL3SAMPLE *ch_c = buffers[2];
OPL3SAMPLE *ch_d = buffers[3];
OPL3SAMPLE *ch_a = buffers[0]; // DO2 (mixed) left output for OPL4
OPL3SAMPLE *ch_b = buffers[1]; // DO2 (mixed) right output for OPL4
OPL3SAMPLE *ch_c = buffers[2]; // DO0 (FM only) left output for OPL4
OPL3SAMPLE *ch_d = buffers[3]; // DO0 (FM only) right output for OPL4
for( i=0; i < length ; i++ )
{
int a,b,c,d;
advance_lfo(chip);
/* clear channel outputs */

8
src/devices/sound/ymf278b.cpp
View File

@ -225,6 +225,14 @@ void ymf278b_device::sound_stream_update(sound_stream &stream, stream_sample_t *
{
// TODO : FM only output is DO0, DO2 is actually mixed FM+PCM outputs
ymf262_update_one(m_ymf262, outputs, samples);
vl = m_mix_level[m_fm_l];
vr = m_mix_level[m_fm_r];
for (i = 0; i < samples; i++)
{
// DO2 mixing
outputs[0][i] = (outputs[0][i] * vl) >> 16;
outputs[1][i] = (outputs[1][i] * vr) >> 16;
}
return;
}