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OPL: Correct CHIP_FREQBASE to match clock ratio 

This changes from 9440540 to 9437184
This commit is contained in:
Natt Akuma 2022-07-01 17:33:33 +07:00
parent e3a22ea7c1
commit 02b28e6e7d
2 changed files with 18 additions and 18 deletions
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34
src/engine/platform/opl.cpp
View File

@ -1669,7 +1669,7 @@ void DivPlatformOPL::setOPLType(int type, bool drums) {
slots=drums?slotsDrums:slotsNonDrums;
chanMap=drums?chanMapOPL2Drums:chanMapOPL2;
outChanMap=outChanMapOPL2;
chipFreqBase=9440540*0.25;
chipFreqBase=32768*72;
chans=9;
melodicChans=drums?6:9;
totalChans=drums?11:9;
@ -1683,7 +1683,7 @@ void DivPlatformOPL::setOPLType(int type, bool drums) {
slots=drums?slotsDrums:slotsNonDrums;
chanMap=drums?chanMapOPL3Drums:chanMapOPL3;
outChanMap=outChanMapOPL3;
chipFreqBase=9440540;
chipFreqBase=32768*288;
chans=18;
melodicChans=drums?15:18;
totalChans=drums?20:18;
@ -1735,9 +1735,6 @@ void DivPlatformOPL::setFlags(unsigned int flags) {
default:
case 1: case 2: case 8950:
switch (flags&0xff) {
case 0x00:
chipClock=COLOR_NTSC;
break;
case 0x01:
chipClock=COLOR_PAL*4.0/5.0;
break;
@ -1753,15 +1750,15 @@ void DivPlatformOPL::setFlags(unsigned int flags) {
case 0x05:
chipClock=3500000.0;
break;
default:
chipClock=COLOR_NTSC;
break;
}
rate=chipClock/72;
chipRateBase=double(rate);
break;
case 3:
switch (flags&0xff) {
case 0x00:
chipClock=COLOR_NTSC*4.0;
break;
case 0x01:
chipClock=COLOR_PAL*16.0/5.0;
break;
@ -1774,28 +1771,31 @@ void DivPlatformOPL::setFlags(unsigned int flags) {
case 0x04:
chipClock=15000000.0;
break;
default:
chipClock=COLOR_NTSC*4.0;
break;
}
rate=chipClock/288;
chipRateBase=double(rate);
chipRateBase=rate;
break;
case 4:
switch (flags&0xff) {
case 0x02:
chipClock=33868800.0;
break;
case 0x00:
chipClock=COLOR_NTSC*8.0;
break;
case 0x01:
chipClock=COLOR_PAL*32.0/5.0;
break;
case 0x02:
chipClock=33868800.0;
break;
default:
chipClock=COLOR_NTSC*8.0;
break;
}
chipRateBase=double(chipClock)/684.0;
rate=chipClock/768;
chipRateBase=chipClock/684;
break;
case 759:
rate=48000;
chipRateBase=double(rate);
chipRateBase=rate;
chipClock=rate*288;
break;
}

2
src/engine/platform/opl.h
View File

@ -95,7 +95,7 @@ class DivPlatformOPL: public DivDispatch {
const unsigned char** slots;
const unsigned short* chanMap;
const unsigned char* outChanMap;
double chipFreqBase, chipRateBase;
int chipFreqBase, chipRateBase;
int delay, chipType, oplType, chans, melodicChans, totalChans, adpcmChan, sampleBank;
unsigned char lastBusy;
unsigned char drumState;