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Fixed independent channel volumes in Okim6376 sound chip, used by the games from the Road Hog era of MPU4 [J. Wallace]

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This commit is contained in:
Angelo Salese 2011-08-17 13:19:50 +00:00
parent f818f699f8
commit 3d5a7dfd54
1 changed files with 7 additions and 3 deletions
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8
src/emu/sound/okim6376.c
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@ -75,7 +75,7 @@ static const int volume_table[3] =
/* divisor lookup table. When an individual word is selected, it can be assigned one of three different 'rates'. /* divisor lookup table. When an individual word is selected, it can be assigned one of three different 'rates'.
These are implemented as clock divisors, and are looked up in the ROM header. More often than not, this value is 0, These are implemented as clock divisors, and are looked up in the ROM header. More often than not, this value is 0,
relating to a division by 8, or nominally 8KHz sampling (based on the datasheet exampleof a 64KHz clock).*/ relating to a division by 8, or nominally 8KHz sampling (based on the datasheet example of a 64KHz clock).*/
static const int divisor_table[3] = static const int divisor_table[3] =
{ {
8, 8,
@ -219,9 +219,12 @@ static void oki_process(okim6376_state *info, int channel, int command)
/* also reset the ADPCM parameters */ /* also reset the ADPCM parameters */
reset_adpcm(voice); reset_adpcm(voice);
/* FIX: no attenuation for now, handle for channel 2 separately */ if (channel == 0)
{
/* We set channel 2's audio separately */
voice->volume = volume_table[0]; voice->volume = volume_table[0];
} }
}
else else
{ {
if (((info->nar)&&(channel == 0))||(channel == 1))//Store the request, for later processing (channel 2 ignores NAR) if (((info->nar)&&(channel == 0))||(channel == 1))//Store the request, for later processing (channel 2 ignores NAR)
@ -574,6 +577,7 @@ WRITE_LINE_DEVICE_HANDLER( okim6376_st_w )
{ {
info->st_pulses ++; info->st_pulses ++;
MSM6376LOG(("OKIM6376:'%s' ST pulses %x\n",device->tag(),info->st_pulses));
if (info->st_pulses > 3) if (info->st_pulses > 3)
{ {
info->st_pulses = 3; //undocumented behaviour beyond 3 pulses info->st_pulses = 3; //undocumented behaviour beyond 3 pulses