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SN: prepare for new easy threshold formula

This commit is contained in:
tildearrow 2022-12-07 23:27:19 -05:00
parent a2be33cf95
commit c91e947ea3
2 changed files with 7 additions and 18 deletions
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23
src/engine/platform/sms.cpp
View File

@ -125,6 +125,9 @@ double DivPlatformSMS::NOTE_SN(int ch, int note) {
if (parent->song.linearPitch==2 || !easyNoise) {
return NOTE_PERIODIC(note);
}
int easyStartingPeriod=16;
//int easyThreshold=round(CHIP_CLOCK/(parent->song.tuning*0.0625*pow(2.0,(float)(nbase+384)/(128.0*12.0)))/CHIP_DIVIDER);
int easyThreshold=round(log((CHIP_CLOCK/(easyStartingPeriod*CHIP_DIVIDER))/parent->song.tuning)/log(2.0));
if (note>easyThreshold) {
return MAX(0,easyStartingPeriod-(note-easyThreshold));
}
@ -132,8 +135,9 @@ double DivPlatformSMS::NOTE_SN(int ch, int note) {
}
int DivPlatformSMS::snCalcFreq(int ch) {
if (parent->song.linearPitch==2 && easyNoise && chan[ch].baseFreq+chan[ch].pitch+chan[ch].pitch2>(easyThreshold<<7)) {
int ret=(((easyStartingPeriod<<7)+0x40)-(chan[ch].baseFreq+chan[ch].pitch+chan[ch].pitch2-(easyThreshold<<7)))>>7;
int easyThreshold=round(128.0*log((CHIP_CLOCK/(easyStartingPeriod*CHIP_DIVIDER))/parent->song.tuning)/log(2.0));
if (parent->song.linearPitch==2 && easyNoise && chan[ch].baseFreq+chan[ch].pitch+chan[ch].pitch2>(easyThreshold)) {
int ret=(((easyStartingPeriod<<7))-(chan[ch].baseFreq+chan[ch].pitch+chan[ch].pitch2-(easyThreshold)))>>7;
if (ret<0) ret=0;
return ret;
}
@ -464,38 +468,24 @@ void DivPlatformSMS::setFlags(const DivConfig& flags) {
switch (flags.getInt("clockSel",0)) {
case 1:
chipClock=COLOR_PAL*4.0/5.0;
easyThreshold=84;
easyStartingPeriod=13;
break;
case 2:
chipClock=4000000;
easyThreshold=86;
easyStartingPeriod=13;
break;
case 3:
chipClock=COLOR_NTSC/2.0;
easyThreshold=72;
easyStartingPeriod=13;
break;
case 4:
chipClock=3000000;
easyThreshold=81;
easyStartingPeriod=13;
break;
case 5:
chipClock=2000000;
easyThreshold=74;
easyStartingPeriod=13;
break;
case 6:
chipClock=COLOR_NTSC/8.0;
easyThreshold=48;
easyStartingPeriod=13;
break;
default:
chipClock=COLOR_NTSC;
easyThreshold=84;
easyStartingPeriod=13;
break;
}
CHECK_CUSTOM_CLOCK;
@ -569,6 +559,7 @@ void DivPlatformSMS::setFlags(const DivConfig& flags) {
stereo=false;
break;
}
rate=chipClock/divider;
for (int i=0; i<4; i++) {
oscBuf[i]->rate=rate;

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

@ -65,8 +65,6 @@ class DivPlatformSMS: public DivDispatch {
int divider=16;
double toneDivider=64.0;
double noiseDivider=64.0;
int easyThreshold;
int easyStartingPeriod;
bool updateSNMode;
bool resetPhase;
bool isRealSN;