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NES: add hardware sweep effect

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This commit is contained in:
tildearrow 2022-02-01 18:28:48 -05:00
parent f09a0b40c3
commit f03ed7c833
5 changed files with 36 additions and 3 deletions
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19
src/engine/platform/nes.cpp
View file

@ -300,6 +300,19 @@ int DivPlatformNES::dispatch(DivCommand c) {
chan[c.chan].freqChanged=true;
}
break;
case DIV_CMD_NES_SWEEP:
if (c.chan>1) break;
if (c.value2==0) {
chan[c.chan].sweep=0x08;
} else {
if (!c.value) { // down
chan[c.chan].sweep=0x88|(c.value2&0x77);
} else { // up
chan[c.chan].sweep=0x80|(c.value2&0x77);
}
}
rWrite(0x4001+(c.chan*4),chan[c.chan].sweep);
break;
case DIV_CMD_SAMPLE_BANK:
sampleBank=c.value;
if (sampleBank>(parent->song.sample.size()/12)) {
@ -341,6 +354,8 @@ void DivPlatformNES::forceIns() {
chan[i].insChanged=true;
chan[i].prevFreq=65535;
}
rWrite(0x4001,chan[0].sweep);
rWrite(0x4005,chan[1].sweep);
}
void* DivPlatformNES::getChanState(int ch) {
@ -366,8 +381,8 @@ void DivPlatformNES::reset() {
nes->apu.cpu_opcode_cycle=0;
rWrite(0x4015,(!isMuted[0])|((!isMuted[1])<<1)|((!isMuted[2])<<2)|((!isMuted[3])<<3)|((!isMuted[4])<<4));
rWrite(0x4001,0x08);
rWrite(0x4005,0x08);
rWrite(0x4001,chan[0].sweep);
rWrite(0x4005,chan[1].sweep);
}
bool DivPlatformNES::keyOffAffectsArp(int ch) {

2
src/engine/platform/nes.h
View file

@ -19,7 +19,7 @@ class DivPlatformNES: public DivDispatch {
note(0),
ins(-1),
duty(0),
sweep(0),
sweep(8),
active(false),
insChanged(true),
freqChanged(false),