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implement several effects

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volume slides, vibrato, slides and portamento
This commit is contained in:
tildearrow 2021-05-14 14:16:48 -05:00
parent 775b88dae2
commit eb692ca9a9
6 changed files with 82 additions and 16 deletions
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30
src/engine/platform/genesis.cpp
View file

@ -160,7 +160,8 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
rWrite(chanOffs[c.chan]+0xb0,(ins->fm.alg&7)|(ins->fm.fb<<3));
rWrite(chanOffs[c.chan]+0xb4,(chan[c.chan].pan<<6)|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
}
chan[c.chan].freq=644.0f*pow(2.0f,((float)c.value/12.0f));
chan[c.chan].baseFreq=644.0f*pow(2.0f,((float)c.value/12.0f));
chan[c.chan].freq=(chan[c.chan].baseFreq*(2048+chan[c.chan].pitch))>>11;
chan[c.chan].freqChanged=true;
chan[c.chan].keyOn=true;
chan[c.chan].active=true;
@ -206,6 +207,33 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
rWrite(chanOffs[c.chan]+0xb4,(chan[c.chan].pan<<6)|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
break;
}
case DIV_CMD_PITCH: {
chan[c.chan].pitch=c.value;
chan[c.chan].freq=(chan[c.chan].baseFreq*(2048+chan[c.chan].pitch))>>11;
chan[c.chan].freqChanged=true;
break;
}
case DIV_CMD_NOTE_PORTA: {
int destFreq=644.0f*pow(2.0f,((float)c.value2/12.0f));
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
chan[c.chan].baseFreq=(chan[c.chan].baseFreq*(960+c.value))/960;
if (chan[c.chan].baseFreq>=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
} else {
chan[c.chan].baseFreq=(chan[c.chan].baseFreq*(960-c.value))/960;
if (chan[c.chan].baseFreq<=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
}
chan[c.chan].freq=(chan[c.chan].baseFreq*(2048+chan[c.chan].pitch))>>11;
chan[c.chan].freqChanged=true;
if (return2) return 2;
break;
}
case DIV_CMD_SAMPLE_MODE: {
if (c.chan==5) {
dacMode=c.value;

4
src/engine/platform/genesis.h
View file

@ -5,13 +5,13 @@
class DivPlatformGenesis: public DivDispatch {
struct Channel {
unsigned char freqH, freqL;
int freq;
int freq, baseFreq, pitch;
unsigned char ins;
signed char konCycles;
bool active, insChanged, freqChanged, keyOn, keyOff;
signed char vol;
unsigned char pan;
Channel(): freqH(0), freqL(0), freq(0), ins(0), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), vol(0), pan(3) {}
Channel(): freqH(0), freqL(0), freq(0), baseFreq(0), pitch(0), ins(0), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), vol(0), pan(3) {}
};
Channel chan[10];
struct QueuedWrite {